/**
 * DTB Landing Page Styles
 * Dynamic Theme Background - Obsidian Plugin
 */

/* ============================================
   CSS Variables & Reset
   ============================================ */
:root {
    scroll-behavior: smooth;
    --dtb-gradient: linear-gradient(135deg, #667eea, #764ba2);
    --dtb-bg-dark: #0a0a0a;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    overflow-x: hidden;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    line-height: 1.6;
    color: #333;
    background: var(--dtb-bg-dark);
    min-height: 100vh;
    overflow-x: hidden;
    word-wrap: break-word;
    overflow-wrap: break-word;
}

/* Skip link for accessibility */
.skip-link {
    position: absolute;
    left: -999px;
    top: auto;
    width: 1px;
    height: 1px;
    overflow: hidden;
}
.skip-link:focus {
    left: 8px;
    top: 8px;
    width: auto;
    height: auto;
    padding: 0.6rem 1rem;
    border-radius: 6px;
    background: #111;
    color: #fff;
    z-index: 9999;
}

/* ============================================
   Dynamic Time-based Background
   ============================================ */
.dynamic-bg {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -2;
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    transition: opacity 1.5s ease-in-out;
    transform: translateZ(0);
}

/* Time-based backgrounds - will be set by JS */
.dynamic-bg.time-dawn {
    background-image: url("assets/A day in the corner of the city/dawn.png");
}
.dynamic-bg.time-morning {
    background-image: url("assets/A day in the corner of the city/morning.png");
}
.dynamic-bg.time-noon {
    background-image: url("assets/A day in the corner of the city/noon.jpg");
}
.dynamic-bg.time-afternoon {
    background-image: url("assets/A day in the corner of the city/afternoon.png");
}
.dynamic-bg.time-dusk {
    background-image: url("assets/A day in the corner of the city/dusk.jpg");
}
.dynamic-bg.time-night {
    background-image: url("assets/A day in the corner of the city/night.jpg");
}

.wallpaper-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    background: linear-gradient(180deg, rgba(0, 0, 0, 0.3) 0%, rgba(0, 0, 0, 0.4) 50%, rgba(0, 0, 0, 0.5) 100%);
    pointer-events: none;
}

@keyframes gradientShift {
    0% {
        background-position: 0% 50%;
    }
    50% {
        background-position: 100% 50%;
    }
    100% {
        background-position: 0% 50%;
    }
}

.floating-particles {
    position: fixed;
    width: 100%;
    height: 100%;
    top: 0;
    left: 0;
    z-index: -1;
}
.particle {
    position: absolute;
    background: rgba(255, 255, 255, 0.08);
    border-radius: 50%;
    animation: float 30s infinite linear;
    will-change: transform;
    transform: translateZ(0);
    backface-visibility: hidden;
}
@keyframes float {
    0% {
        transform: translate3d(0, 100vh, 0);
        opacity: 0;
    }
    10% {
        opacity: 0.6;
    }
    90% {
        opacity: 0.6;
    }
    100% {
        transform: translate3d(0, -100px, 0);
        opacity: 0;
    }
}

/* ============================================
   Layout & Container
   ============================================ */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 clamp(15px, 4vw, 40px);
    position: relative;
    z-index: 1;
    width: 100%;
}

/* Note: content-visibility removed for iOS Safari compatibility */

.full-section {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    padding: clamp(2rem, 5vh, 4rem) 0;
    color: white;
}

/* ============================================
   Header & Navigation
   ============================================ */
.header {
    background: rgba(0, 0, 0, 0.2);
    backdrop-filter: blur(20px);
    position: sticky;
    top: 0;
    z-index: 100;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}
.nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 0;
}
.logo {
    font-size: 1.5rem;
    font-weight: bold;
    color: white;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    text-decoration: none !important;
    cursor: pointer;
}
.logo:focus-visible {
    outline: 2px solid #667eea;
    outline-offset: 4px;
    border-radius: 8px;
}
.logo:hover {
    opacity: 0.9;
}

.nav-links {
    display: flex;
    gap: 2rem;
}
.nav-links a {
    color: white;
    text-decoration: none;
    opacity: 0.8;
    transition: opacity 0.3s;
    font-weight: 500;
}
.nav-links a:hover {
    opacity: 1;
    text-shadow: 0 0 10px rgba(255, 255, 255, 0.5);
}

/* Icon buttons in nav */
.nav-links a.icon-btn,
.nav-links button.icon-btn {
    width: 2.1rem;
    height: 2.1rem;
    padding: 0;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border-radius: 12px;
    background: rgba(255, 255, 255, 0.08);
    border: 1px solid rgba(255, 255, 255, 0.15);
    opacity: 0.85;
    font-size: 0;
    cursor: pointer;
}
.nav-links a.icon-btn span.ico,
.nav-links button.icon-btn span.ico {
    font-size: 1.05rem;
    line-height: 1;
    filter: drop-shadow(0 2px 4px rgba(0, 0, 0, 0.35));
}
.nav-links a.icon-btn svg,
.nav-links button.icon-btn svg {
    width: 1.1rem;
    height: 1.1rem;
    display: block;
    fill: #fff;
}
.nav-links a.icon-btn:hover,
.nav-links button.icon-btn:hover {
    opacity: 1;
    background: linear-gradient(145deg, rgba(255, 255, 255, 0.16), rgba(255, 255, 255, 0.07));
    box-shadow:
        0 4px 14px -6px rgba(0, 0, 0, 0.55),
        0 0 0 1px rgba(255, 255, 255, 0.25) inset;
}
.nav-links a.icon-btn:focus-visible,
.nav-links button.icon-btn:focus-visible {
    outline: 2px solid #667eea;
    outline-offset: 3px;
}

/* Language toggle */
.lang-toggle {
    position: relative;
}
.lang-toggle .lang-text {
    position: absolute;
    bottom: -4px;
    right: -4px;
    background: linear-gradient(135deg, #667eea, #764ba2);
    color: #fff;
    font-size: 0.55rem;
    line-height: 1;
    padding: 0.2rem 0.35rem 0.28rem;
    border-radius: 8px;
    letter-spacing: 0.5px;
    font-weight: 600;
    box-shadow: 0 2px 6px -2px rgba(0, 0, 0, 0.5);
    pointer-events: none;
}
.lang-toggle:hover .lang-text {
    filter: brightness(1.1);
}

/* Global links */
a:not(.btn):not(.icon-btn):not(.nav-links a):not(.logo) {
    color: rgb(230 235 255 / 86%);
    text-decoration: underline;
    text-decoration-color: rgba(255, 255, 255, 0.25);
    text-underline-offset: 3px;
    transition:
        color 0.3s,
        text-decoration-color 0.35s;
}
a:not(.btn):not(.icon-btn):not(.nav-links a):not(.logo):hover {
    color: #ffffff;
    text-decoration-color: #889dff;
}
a code {
    color: inherit;
}

/* ============================================
   Hero Section
   ============================================ */
.hero {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 60px 0 80px;
    color: white;
    position: relative;
}

.hero-overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(180deg, rgba(0, 0, 0, 0.3) 0%, rgba(0, 0, 0, 0.1) 40%, rgba(0, 0, 0, 0.2) 100%);
    pointer-events: none;
}

.hero-container {
    position: relative;
    z-index: 1;
    text-align: center;
    max-width: 900px;
    padding: 0 2rem;
}

.hero-badge {
    display: inline-block;
    padding: 0.4rem 1rem;
    background: rgba(139, 92, 246, 0.3);
    border: 1px solid rgba(139, 92, 246, 0.5);
    border-radius: 50px;
    font-size: 0.8rem;
    font-weight: 600;
    color: #c4b5fd;
    letter-spacing: 0.05em;
    text-transform: uppercase;
    margin-bottom: 1.5rem;
    opacity: 0;
    animation: fadeInUp 0.6s 0.1s forwards;
}

.hero-title {
    font-size: clamp(2.5rem, 8vw, 4.5rem);
    margin-bottom: 1.25rem;
    font-weight: 800;
    opacity: 0;
    animation: fadeInUp 0.6s 0.2s forwards;
    line-height: 1.3;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0;
}

.hero-title-text {
    display: block;
    background: linear-gradient(135deg, #ffffff 0%, #e0e7ff 50%, #c4b5fd 100%);
    background-clip: text;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    text-shadow: none;
    padding-bottom: 0.1em;
}

.hero-title-animated {
    background: linear-gradient(90deg, #ffffff 0%, #c4b5fd 25%, #a78bfa 50%, #c4b5fd 75%, #ffffff 100%);
    background-size: 200% 100%;
    background-clip: text;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    animation:
        fadeInUp 0.6s 0.2s forwards,
        titleShimmer 4s 1s ease-in-out infinite;
}

@keyframes titleShimmer {
    0% {
        background-position: 100% 50%;
    }
    50% {
        background-position: 0% 50%;
    }
    100% {
        background-position: 100% 50%;
    }
}

.hero-tagline {
    font-size: 1.25rem;
    color: rgba(255, 255, 255, 0.85);
    margin-bottom: 2.5rem;
    opacity: 0;
    animation: fadeInUp 0.6s 0.3s forwards;
    letter-spacing: 0.02em;
    text-align: center;
}

.hero-tagline .obsidian-link {
    color: #a88beb;
    text-decoration: none;
    font-weight: 600;
    transition:
        color 0.2s,
        text-shadow 0.2s;
}

.hero-tagline .obsidian-link:hover {
    color: #c4b5fd;
    text-shadow: 0 0 20px rgba(168, 139, 235, 0.6);
}

.hero-stats {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 2rem;
    margin-bottom: 2.5rem;
    opacity: 0;
    animation: fadeInUp 0.6s 0.4s forwards;
}

.hero-stat {
    text-align: center;
}

.hero-stat-number {
    display: block;
    font-size: 2rem;
    font-weight: 700;
    color: #fff;
    line-height: 1.2;
}

.hero-stat-label {
    display: block;
    font-size: 0.8rem;
    color: rgba(255, 255, 255, 0.7);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.hero-stat-divider {
    width: 1px;
    height: 40px;
    background: rgba(255, 255, 255, 0.2);
}

.cta-buttons {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
    justify-content: center;
    width: 100%;
    opacity: 0;
    animation: fadeInUp 0.6s 0.5s forwards;
}

.btn-ghost {
    background: transparent;
    border: 2px solid rgba(255, 255, 255, 0.4);
    color: #fff;
}

.btn-ghost:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: rgba(255, 255, 255, 0.6);
}

.hero-scroll-hint {
    position: relative;
    margin-top: 2.5rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
    color: rgba(255, 255, 255, 0.6);
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    opacity: 0;
    animation: fadeInUp 0.6s 0.7s forwards;
}

.hero-scroll-arrow {
    width: 20px;
    height: 20px;
    border-right: 2px solid rgba(255, 255, 255, 0.5);
    border-bottom: 2px solid rgba(255, 255, 255, 0.5);
    transform: rotate(45deg);
    animation: scrollBounce 2s ease-in-out infinite;
}

@keyframes scrollBounce {
    0%,
    100% {
        transform: rotate(45deg) translate(0, 0);
    }
    50% {
        transform: rotate(45deg) translate(3px, 3px);
    }
}

.emoji-isolate {
    filter: drop-shadow(0 2px 8px rgba(0, 0, 0, 0.4));
    line-height: 1;
    font-size: 0.9em;
}

@keyframes floatHint {
    0%,
    100% {
        transform: translateY(0);
    }
    50% {
        transform: translateY(-4px);
    }
}

/* Hero Showcase: Image + Actions (kept for potential future use) */
.hero-showcase {
    display: flex;
    align-items: stretch;
    gap: 1rem;
    margin-bottom: 1.5rem;
    opacity: 0;
    animation: fadeInUp 0.8s 0.3s forwards;
}
.hero-img-wrap {
    flex: 1;
    max-width: 720px;
    position: relative;
    border-radius: 12px;
    overflow: hidden;
    box-shadow:
        0 25px 80px rgba(0, 0, 0, 0.5),
        0 0 0 1px rgba(255, 255, 255, 0.12),
        inset 0 1px 0 rgba(255, 255, 255, 0.1);
}
.hero-img-wrap img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}
.hero-actions {
    display: flex;
    flex-direction: column;
    gap: 0.6rem;
    justify-content: center;
}
.hero-action-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    background: rgba(0, 0, 0, 0.4);
    backdrop-filter: blur(12px);
    padding: 0.75rem 1rem;
    border-radius: 10px;
    font-size: 0.82rem;
    border: 1px solid rgba(255, 255, 255, 0.1);
    color: rgba(255, 255, 255, 0.9);
    text-align: left;
}
.hero-action-item .action-ico {
    font-size: 1rem;
}
.hero-action-item strong {
    color: #fff;
}

.hero .subtitle {
    font-size: 1.4rem;
    margin-bottom: 1.5rem;
    opacity: 0;
    animation: fadeInUp 1s 0.6s forwards;
    font-weight: 400;
    color: rgba(255, 255, 255, 0.9);
}
.hero p {
    font-size: 1.05rem;
    margin-bottom: 2rem;
    max-width: 560px;
    margin-left: auto;
    margin-right: auto;
    opacity: 0;
    animation: fadeInUp 1s 0.8s forwards;
    line-height: 1.7;
    color: rgba(255, 255, 255, 0.75);
    text-align: center;
}

/* Hero Visual */
.hero-visual {
    opacity: 0;
    animation: fadeInUp 1s 0.6s forwards;
}
.hero-img-wrap {
    position: relative;
    border-radius: 16px;
    overflow: hidden;
    box-shadow:
        0 20px 60px rgba(0, 0, 0, 0.4),
        0 0 0 1px rgba(255, 255, 255, 0.1);
}
.hero-img-wrap img {
    width: 100%;
    height: auto;
    display: block;
    border-radius: 16px;
}
.hero-img-glow {
    position: absolute;
    inset: -30%;
    background: radial-gradient(ellipse at center, rgba(102, 126, 234, 0.2) 0%, transparent 50%);
    pointer-events: none;
    z-index: -1;
}
.hero-actions {
    display: flex;
    gap: 0.6rem;
    margin-top: 1rem;
    flex-wrap: wrap;
    justify-content: center;
}
.hero-action-item {
    display: flex;
    align-items: center;
    gap: 0.4rem;
    background: rgba(255, 255, 255, 0.06);
    padding: 0.45rem 0.75rem;
    border-radius: 8px;
    font-size: 0.72rem;
    border: 1px solid rgba(255, 255, 255, 0.08);
    color: rgba(255, 255, 255, 0.8);
}
.hero-action-item .action-ico {
    font-size: 0.85rem;
}

/* ============================================
   Buttons
   ============================================ */
.btn {
    padding: 1.2rem 2.5rem;
    border: none;
    border-radius: 50px;
    font-size: 1.1rem;
    cursor: pointer;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    transition: all 0.3s;
    font-weight: 600;
    position: relative;
    overflow: hidden;
}
.btn-primary {
    background: var(--dtb-gradient);
    color: white;
    box-shadow: 0 15px 35px rgba(102, 126, 234, 0.3);
}
.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 25px 50px rgba(102, 126, 234, 0.4);
}
.btn-secondary {
    background: rgba(255, 255, 255, 0.1);
    color: white;
    border: 2px solid rgba(255, 255, 255, 0.3);
    backdrop-filter: blur(10px);
}
.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.2);
    transform: translateY(-3px);
    box-shadow: 0 15px 30px rgba(255, 255, 255, 0.1);
}
.btn-tertiary {
    background: rgba(255, 255, 255, 0.15);
    color: white;
    border: none;
}

/* ============================================
   Section Titles
   ============================================ */
.section-heading .heading-text,
.features h2 .heading-text,
.api-sources h2 .heading-text,
.demo h2 .heading-text,
.installation h2 .heading-text,
.faq h2 .heading-text,
#roadmap h2 .heading-text,
#quickstart h2 .heading-text {
    background: var(--dtb-gradient);
    background-clip: text;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    display: inline-block;
}

/* ============================================
   Quick Start Section
   ============================================ */
.quickstart {
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(8px);
}
.quickstart h2 {
    text-align: center;
    font-size: 2.8rem;
    margin-bottom: 1rem;
}
.section-subtitle {
    text-align: center;
    color: rgba(255, 255, 255, 0.7);
    font-size: 1.1rem;
    margin-bottom: 3rem;
}
.quickstart-content {
    display: flex;
    flex-direction: column;
    gap: 3rem;
}
.quickstart-steps {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
}
.quickstart-step {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 16px;
    padding: 1.75rem;
    text-align: left;
}
.step-number {
    display: inline-block;
    font-size: 0.75rem;
    font-weight: 600;
    color: #667eea;
    background: rgba(102, 126, 234, 0.15);
    padding: 0.3rem 0.8rem;
    border-radius: 20px;
    margin-bottom: 0.8rem;
    letter-spacing: 0.05em;
}
.quickstart-step h3 {
    color: #fff;
    font-size: 1.2rem;
    margin-bottom: 0.6rem;
}
.quickstart-step p {
    color: rgba(255, 255, 255, 0.7);
    font-size: 0.9rem;
    line-height: 1.5;
}
.quickstart-step code {
    background: rgba(102, 126, 234, 0.2);
    padding: 0.15rem 0.4rem;
    border-radius: 4px;
    font-size: 0.85em;
}

.statusbar-demo {
    display: grid;
    grid-template-columns: 1.2fr 1fr;
    gap: 2rem;
    align-items: center;
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: 20px;
    padding: 2rem;
}
.statusbar-figure {
    position: relative;
}
.statusbar-figure img {
    width: 100%;
    height: auto;
    border-radius: 12px;
    box-shadow: 0 15px 40px rgba(0, 0, 0, 0.4);
}
.statusbar-figure figcaption {
    text-align: center;
    color: rgba(255, 255, 255, 0.5);
    font-size: 0.85rem;
    margin-top: 0.8rem;
}
.statusbar-actions h4 {
    color: #fff;
    font-size: 1.1rem;
    margin-bottom: 1rem;
}
.statusbar-action {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    padding: 0.6rem 0;
    color: rgba(255, 255, 255, 0.85);
    font-size: 0.9rem;
    border-bottom: 1px solid rgba(255, 255, 255, 0.06);
}
.statusbar-action:last-of-type {
    border-bottom: none;
}
.statusbar-action .action-ico {
    font-size: 1rem;
}
.statusbar-action strong {
    color: #fff;
}
.statusbar-hint {
    color: rgba(255, 255, 255, 0.6);
    font-size: 0.85rem;
    margin-top: 1rem;
}
.statusbar-tip {
    color: #667eea;
    font-size: 0.8rem;
    margin-top: 0.5rem;
    font-style: italic;
}

.quickstart-done {
    text-align: center;
    color: rgba(255, 255, 255, 0.7);
    font-size: 1rem;
    margin-top: 2rem;
    padding: 1rem;
    background: rgba(102, 126, 234, 0.1);
    border-radius: 12px;
    border: 1px solid rgba(102, 126, 234, 0.2);
}

/* ============================================
   Features Section
   ============================================ */
.features {
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(10px);
}
.features h2 {
    text-align: center;
    font-size: 3.5rem;
    margin-bottom: 2rem;
    display: flex;
    justify-content: center;
    gap: 0.6rem;
    align-items: center;
}
.features-subtitle {
    text-align: center;
    font-size: 1.2rem;
    margin-bottom: 4rem;
    opacity: 0.8;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}
.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem 1.75rem;
    margin-bottom: 3rem;
}

.feature-card {
    background: linear-gradient(175deg, rgba(255, 255, 255, 0.07), rgba(255, 255, 255, 0.035));
    padding: 1.75rem 1.55rem 1.55rem;
    border-radius: 20px;
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.09);
    transition:
        background 0.45s,
        transform 0.45s cubic-bezier(0.4, 0.2, 0.2, 1),
        box-shadow 0.45s,
        border-color 0.45s;
    position: relative;
    overflow: hidden;
    line-height: 1.55;
    display: grid;
    grid-template-rows: auto 1fr;
    min-height: 200px;
    row-gap: 0.55rem;
    --accent: #667eea;
    --accent-fade: color-mix(in srgb, var(--accent) 25%, transparent);
}
.feature-card::before {
    content: "";
    position: absolute;
    inset: 0;
    border-radius: inherit;
    padding: 1px;
    background: linear-gradient(140deg, var(--accent) 0%, rgba(255, 255, 255, 0.25) 55%, var(--accent) 110%);
    -webkit-mask:
        linear-gradient(#000 0 0) content-box,
        linear-gradient(#000 0 0);
    mask:
        linear-gradient(#000 0 0) content-box,
        linear-gradient(#000 0 0);
    -webkit-mask-composite: xor;
    mask-composite: exclude;
    opacity: 0;
    transition: opacity 0.55s;
    pointer-events: none;
}
.feature-card::after {
    content: "";
    position: absolute;
    top: -10%;
    left: -5%;
    width: 140%;
    height: 140%;
    background: radial-gradient(circle at 30% 25%, var(--accent-fade), transparent 60%);
    opacity: 0.22;
    mix-blend-mode: plus-lighter;
    pointer-events: none;
    transition: opacity 0.6s;
}
.feature-card:hover::before {
    opacity: 1;
}
.feature-card:hover::after {
    opacity: 0.35;
}
.feature-card:hover {
    transform: translateY(-6px) scale(1.012);
    box-shadow:
        0 16px 38px -10px rgba(0, 0, 0, 0.5),
        0 0 0 1px rgba(255, 255, 255, 0.14) inset,
        0 0 0 1px var(--accent-fade);
    border-color: rgba(255, 255, 255, 0.18);
    background: linear-gradient(175deg, rgba(255, 255, 255, 0.1), rgba(255, 255, 255, 0.045));
}

.feature-icon {
    font-size: 1.65rem;
    display: inline-flex;
    margin: 0 0.55rem 0 0;
    line-height: 1;
    flex-shrink: 0;
    position: relative;
    z-index: 1;
    filter: drop-shadow(0 2px 4px rgba(0, 0, 0, 0.35));
}
.feature-icon:after {
    content: "";
    position: absolute;
    inset: -4px;
    background: radial-gradient(circle at 45% 35%, var(--accent-fade), transparent 70%);
    border-radius: 14px;
    z-index: -1;
    opacity: 0.65;
    filter: blur(2px) saturate(140%);
    transition:
        opacity 0.5s,
        transform 0.6s;
}
.feature-card:hover .feature-icon:after {
    opacity: 0.95;
    transform: scale(1.08);
}
.feature-card h3 {
    font-size: 1.32rem;
    margin: 0;
    color: #fff;
    line-height: 1.18;
    display: flex;
    align-items: center;
    font-weight: 600;
    letter-spacing: 0.3px;
    background: linear-gradient(90deg, #fff, rgba(255, 255, 255, 0.85));
    -webkit-background-clip: text;
    background-clip: text;
}
.feature-card p {
    opacity: 0.9;
    line-height: 1.55;
    font-size: 0.92rem;
    margin: 0.15rem 0 0;
    letter-spacing: 0.25px;
    align-self: center;
}

/* ============================================
   Demo Section
   ============================================ */
.demo {
    background: rgba(0, 0, 0, 0.7);
    text-align: center;
}
.demo h2 {
    font-size: 3rem;
    margin-bottom: 3rem;
    display: flex;
    justify-content: center;
    gap: 0.6rem;
    align-items: center;
}
.demo-gallery {
    display: flex;
    flex-wrap: wrap;
    gap: 2rem;
    justify-content: center;
    align-items: stretch;
}
.demo-item {
    background: rgba(255, 255, 255, 0.07);
    border-radius: 18px;
    box-shadow: 0 4px 24px rgba(0, 0, 0, 0.12);
    padding: 2rem;
    max-width: 420px;
    flex: 1 1 320px;
    display: flex;
    flex-direction: column;
    align-items: stretch;
}
.demo-item h3,
.demo-item .demo-img-wrap {
    align-self: center;
    text-align: center;
}
.demo-item ul {
    width: 100%;
    align-self: stretch;
    text-align: left;
    padding-left: 1.2rem;
    color: #eee;
    font-size: 1rem;
    line-height: 1.7;
    margin-bottom: 0;
    flex: 1;
}
.demo-item h3 {
    margin-bottom: 1rem;
    font-size: 1.3rem;
    color: #667eea;
}

.demo-img-wrap {
    width: 100%;
    position: relative;
    aspect-ratio: 16 / 9;
    background: rgba(0, 0, 0, 0.2);
    border-radius: 12px;
    overflow: hidden;
    margin-bottom: 1rem;
}
.demo-img {
    width: 100%;
    height: 100%;
    object-fit: contain;
    border-radius: 12px;
    box-shadow: 0 2px 12px rgba(102, 126, 234, 0.12);
}
.demo-img-label {
    position: absolute;
    left: 12px;
    bottom: 12px;
    background: rgba(102, 126, 234, 0.8);
    color: #fff;
    font-size: 0.95rem;
    padding: 0.2rem 0.8rem;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
}

.demo-summary {
    text-align: center;
    margin-top: 2rem;
    opacity: 0.85;
    font-size: 0.95rem;
}
.summary-pills {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 0.6rem;
    margin-top: 2.5rem;
    max-width: 820px;
    margin-left: auto;
    margin-right: auto;
}
.summary-pill {
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    padding: 0.4rem 0.9rem 0.42rem;
    background: rgba(255, 255, 255, 0.08);
    border: 1px solid rgba(255, 255, 255, 0.18);
    border-radius: 40px;
    font-size: 0.72rem;
    letter-spacing: 0.4px;
    font-weight: 500;
    backdrop-filter: blur(6px);
}
.summary-pill .ico {
    font-size: 0.95rem;
    line-height: 1;
}

/* ============================================
   Quick Start Section
   ============================================ */
.qs-steps-row {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1.4rem;
    margin-bottom: 2.2rem;
}
.qs-steps-row.three {
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    max-width: 1100px;
    margin-left: auto;
    margin-right: auto;
}
@media (min-width: 1100px) {
    .qs-steps-row.three {
        grid-template-columns: repeat(3, 1fr);
    }
}

.qs-step {
    background: linear-gradient(145deg, rgba(255, 255, 255, 0.08), rgba(255, 255, 255, 0.04));
    border: 1px solid rgba(255, 255, 255, 0.16);
    border-radius: 20px;
    padding: 1.55rem 1.35rem 1.3rem;
    position: relative;
    display: flex;
    flex-direction: column;
    min-height: 150px;
    overflow: hidden;
    transition:
        background 0.35s,
        transform 0.4s,
        box-shadow 0.4s;
}
.qs-step:before {
    content: "";
    position: absolute;
    inset: 0;
    padding: 1px;
    border-radius: inherit;
    background: linear-gradient(130deg, #667eea66, #764ba266, #667eea33);
    -webkit-mask:
        linear-gradient(#000 0 0) content-box,
        linear-gradient(#000 0 0);
    mask:
        linear-gradient(#000 0 0) content-box,
        linear-gradient(#000 0 0);
    -webkit-mask-composite: xor;
    mask-composite: exclude;
    pointer-events: none;
}
.qs-step:hover {
    background: linear-gradient(145deg, rgba(255, 255, 255, 0.12), rgba(255, 255, 255, 0.05));
    transform: translateY(-6px) scale(1.015);
    box-shadow:
        0 12px 28px -10px rgba(0, 0, 0, 0.55),
        0 0 0 1px rgba(255, 255, 255, 0.15) inset;
}
.qs-step h3 {
    margin: 0 0 0.65rem;
    font-size: 1.05rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-weight: 600;
}
.qs-step h3 .feature-icon {
    font-size: 1.45rem;
    margin: 0;
    filter: none;
    transform: none;
}
.qs-step p {
    margin: 0;
    font-size: 0.8rem;
    line-height: 1.45;
    opacity: 0.85;
}
.qs-step-number {
    position: absolute;
    top: 0.55rem;
    right: 0.7rem;
    font-size: 0.65rem;
    letter-spacing: 0.5px;
    background: linear-gradient(135deg, #667eea, #764ba2);
    color: #fff;
    padding: 0.25rem 0.5rem;
    border-radius: 999px;
    font-weight: 600;
}

/* Status bar preview */
.statusbar-preview {
    --sb-gap: 1.8rem;
    display: flex;
    flex-wrap: wrap;
    gap: var(--sb-gap);
    align-items: flex-start;
    max-width: 1080px;
    margin: 1.8rem auto 2.8rem;
    justify-content: center;
    text-align: center;
}
.statusbar-preview figure {
    margin: 0;
    max-width: 640px;
    flex: 0 1 640px;
}
.statusbar-preview img {
    width: 100%;
    border-radius: 16px;
    box-shadow: 0 10px 30px -8px rgba(0, 0, 0, 0.55);
    border: 1px solid rgba(255, 255, 255, 0.14);
}
.statusbar-preview figcaption {
    font-size: 0.74rem;
    opacity: 0.62;
    margin-top: 0.55rem;
    line-height: 1.35;
    text-align: center;
}
.statusbar-details {
    flex: 1 1 300px;
    max-width: 340px;
    font-size: 0.9rem;
    line-height: 1.55;
}
.statusbar-details h4 {
    margin: 0.15rem 0 0.75rem;
    font-size: 1.05rem;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    font-weight: 600;
}
.statusbar-actions {
    list-style: none;
    margin: 0 0 1.15rem;
    padding: 0;
    display: grid;
    gap: 0.55rem;
    text-align: left;
}
.statusbar-actions li {
    background: rgba(255, 255, 255, 0.06);
    padding: 0.55rem 0.75rem;
    border-radius: 10px;
    border: 1px solid rgba(255, 255, 255, 0.1);
    font-size: 0.78rem;
    display: flex;
    align-items: center;
    gap: 0.55rem;
}
.statusbar-actions li span.action-ico {
    font-size: 1.05rem;
    line-height: 1;
}
.statusbar-hint {
    font-size: 0.75rem;
    opacity: 0.75;
    line-height: 1.45;
}
.statusbar-tip {
    font-size: 0.66rem;
    letter-spacing: 0.5px;
    text-transform: uppercase;
    opacity: 0.5;
    margin-top: 0.3rem;
}

/* ============================================
   Installation Section
   ============================================ */
.installation {
    background: rgba(0, 0, 0, 0.8);
}
.installation h2 {
    text-align: center;
    font-size: 3rem;
    margin-bottom: 4rem;
    display: flex;
    justify-content: center;
    gap: 0.6rem;
    align-items: center;
}

.install-tabs {
    margin-bottom: 3rem;
}
.install-tabs .tab-list {
    display: flex;
    gap: 0.75rem;
    flex-wrap: wrap;
    margin: 0 0 1.5rem;
    list-style: none;
    padding: 0;
}
.install-tabs .tab-btn {
    background: rgba(255, 255, 255, 0.07);
    border: 1px solid rgba(255, 255, 255, 0.18);
    color: #fff;
    padding: 0.65rem 1.1rem;
    border-radius: 40px;
    cursor: pointer;
    font-size: 0.85rem;
    letter-spacing: 0.4px;
    display: inline-flex;
    align-items: center;
    gap: 0.45rem;
    transition:
        background 0.25s,
        border-color 0.25s;
}
.install-tabs .tab-btn[aria-selected="true"],
.install-tabs .tab-btn.is-active {
    background: linear-gradient(135deg, #667eea, #764ba2);
    border-color: #889dff;
    box-shadow: 0 6px 20px rgba(102, 126, 234, 0.35);
}
.install-tabs .tab-btn:focus-visible {
    outline: 2px solid #889dff;
    outline-offset: 2px;
}
.install-tabs .tab-panels {
    position: relative;
}
.install-tabs .tab-panel {
    display: none;
    animation: fadeInUp 0.5s;
}
.install-tabs .tab-panel.is-active {
    display: block;
}

.tab-panel .install-method {
    margin: 0;
}
.install-method {
    background: rgba(255, 255, 255, 0.05);
    padding: 3rem;
    border-radius: 25px;
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    transition: transform 0.3s;
}
.install-method:hover {
    transform: translateY(-5px);
}
.install-method h3 {
    font-size: 1.8rem;
    margin: 0 0 2rem;
    color: #667eea;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.install-status {
    display: inline-block;
    padding: 0.3rem 0.8rem;
    border-radius: 20px;
    font-size: 0.8rem;
    margin-left: 0.5rem;
}
.status-pending {
    background: rgba(255, 193, 7, 0.2);
    color: #ffc107;
    border: 1px solid rgba(255, 193, 7, 0.3);
}
.status-available {
    background: rgba(40, 167, 69, 0.2);
    color: #28a745;
    border: 1px solid rgba(40, 167, 69, 0.3);
}
.status-beta {
    background: rgba(102, 126, 234, 0.18);
    color: #889dff;
    border: 1px solid rgba(102, 126, 234, 0.35);
}

.install-steps {
    list-style: none;
}
.install-steps li {
    padding: 0.9rem 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    display: flex;
    align-items: flex-start;
    gap: 0.85rem;
    line-height: 1.5;
}
.install-steps li:last-child {
    border-bottom: none;
}
.install-step-number {
    width: 30px;
    height: 30px;
    background: linear-gradient(135deg, #667eea, #764ba2);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    flex-shrink: 0;
    line-height: 1;
    margin-top: 0.15rem;
    box-shadow: 0 4px 10px -4px rgba(0, 0, 0, 0.5);
}
.install-steps code {
    position: relative;
    top: 1px;
    font-size: 0.78rem;
    padding: 0.15rem 0.45rem 0.18rem;
    background: rgba(255, 255, 255, 0.08);
    border: 1px solid rgba(255, 255, 255, 0.15);
    border-radius: 6px;
    font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
    letter-spacing: 0.3px;
    word-break: break-all;
}
.install-note-small {
    font-size: 0.75rem;
    opacity: 0.6;
    margin-top: 0.75rem;
    line-height: 1.4;
}
.repo-inline-code {
    background: rgba(255, 255, 255, 0.08);
    padding: 0.25rem 0.5rem;
    border-radius: 6px;
    font-size: 0.75rem;
}

/* ============================================
   API Sources Section
   ============================================ */
.api-sources {
    background: rgba(0, 0, 0, 0.4);
    text-align: center;
}
.api-sources h2 {
    font-size: 3rem;
    margin-bottom: 2rem;
    display: flex;
    justify-content: center;
    gap: 0.6rem;
    align-items: center;
}
.api-logos {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(210px, 1fr));
    gap: 1.4rem 1.6rem;
    margin: 3rem 0 2.5rem;
    align-items: stretch;
}

.api-logo {
    position: relative;
    display: flex;
    flex-direction: column;
    justify-content: flex-start;
    background: linear-gradient(180deg, rgba(255, 255, 255, 0.055), rgba(255, 255, 255, 0.025));
    padding: 1.55rem 1.3rem 1.35rem;
    border-radius: 18px;
    border: 1px solid rgba(255, 255, 255, 0.1);
    transition:
        background 0.35s,
        transform 0.4s,
        box-shadow 0.4s,
        border-color 0.4s;
    text-decoration: none !important;
}
.api-logo:before {
    content: "";
    position: absolute;
    inset: 0;
    border-radius: inherit;
    background: radial-gradient(circle at 30% 20%, rgba(255, 255, 255, 0.25), transparent 60%);
    opacity: 0.18;
    pointer-events: none;
}
.api-logo:hover {
    transform: translateY(-6px);
    background: linear-gradient(185deg, rgba(255, 255, 255, 0.11), rgba(255, 255, 255, 0.04));
    border-color: rgba(255, 255, 255, 0.22);
    box-shadow:
        0 10px 28px -10px rgba(0, 0, 0, 0.55),
        0 0 0 1px rgba(255, 255, 255, 0.15) inset;
}
.api-logo > div:first-child {
    font-size: 3rem;
    line-height: 1;
    filter: drop-shadow(0 4px 8px rgba(0, 0, 0, 0.35));
}
.api-logo .api-logo-icon {
    font-size: 3rem;
}
.api-logo-name {
    font-size: 1.05rem;
    font-weight: 600;
    margin: 0.9rem 0 0.35rem;
    letter-spacing: 0.4px;
    color: #f5f7fa;
    text-decoration: none;
}
.api-logo p {
    --pill-bg: rgba(255, 255, 255, 0.04);
    --pill-border: rgba(255, 255, 255, 0.18);
    font-size: 0.63rem;
    letter-spacing: 0.65px;
    text-transform: uppercase;
    margin: 0.5rem 0 0.55rem;
    font-weight: 500;
    color: rgba(255, 255, 255, 0.78);
    opacity: 0.8;
    padding: 0.32rem 0.6rem 0.34rem;
    border-radius: 999px;
    border: 1px solid var(--pill-border);
    background: var(--pill-bg);
    display: inline-flex;
    align-items: center;
    gap: 0.4ch;
    line-height: 1;
    transition:
        background 0.45s,
        color 0.4s,
        border-color 0.45s,
        box-shadow 0.45s;
}
.api-logo p:before {
    content: "";
    width: 0.5rem;
    height: 0.5rem;
    border-radius: 50%;
    background: var(--accent, #667eea);
    box-shadow: 0 0 0 3px rgba(255, 255, 255, 0.06);
}
.api-logo:hover p {
    --pill-bg: linear-gradient(120deg, rgba(255, 255, 255, 0.16), rgba(255, 255, 255, 0.06));
    color: #fff;
    border-color: var(--accent, #667eea);
}

/* ============================================
   Roadmap Section
   ============================================ */
#roadmap .container {
    max-width: 1150px;
}
#roadmap .roadmap-subtitle {
    max-width: 760px;
    margin: 0 0 2.2rem;
    opacity: 0.8;
    text-align: left;
}
.roadmap-list {
    list-style: none;
    margin: 0;
    padding: 0;
    display: grid;
    gap: 1rem;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    text-align: left;
}
.roadmap-item {
    background: rgba(255, 255, 255, 0.05);
    padding: 1rem 1.25rem;
    border-radius: 16px;
    border: 1px solid rgba(255, 255, 255, 0.08);
    display: flex;
    gap: 0.65rem;
    align-items: flex-start;
}
.roadmap-item span.ri-ico {
    font-size: 1.2rem;
}
.roadmap-item .ri-desc {
    opacity: 0.75;
}
.section-note {
    font-size: 0.85rem;
    opacity: 0.65;
    margin-top: 1rem;
}

/* ============================================
   FAQ Section
   ============================================ */
.faq {
    background: rgba(0, 0, 0, 0.5);
}
.faq h2 {
    text-align: center;
    font-size: 3rem;
    margin-bottom: 4rem;
    display: flex;
    justify-content: center;
    gap: 0.6rem;
    align-items: center;
}
.faq-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
}
.faq-item {
    background: rgba(255, 255, 255, 0.05);
    padding: 2rem;
    border-radius: 20px;
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.1);
}
.faq-question {
    font-size: 1.2rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: #667eea;
}
.faq-answer {
    opacity: 0.9;
    line-height: 1.6;
}
.faq-disclaimer {
    margin-top: 3rem;
    opacity: 0.6;
    font-size: 0.85rem;
}

/* ============================================
   Footer
   ============================================ */
.footer {
    background: #000;
    color: white;
    text-align: center;
    padding: 3.2rem 0 2.2rem;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}
.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2.4rem;
    margin-bottom: 2rem;
    text-align: left;
}
.footer-section h3 {
    margin-bottom: 1rem;
    font-weight: 600;
    background: linear-gradient(90deg, #ffffff, #cfd8ff);
    -webkit-background-clip: text;
    background-clip: text;
    color: #eef2ff;
    letter-spacing: 0.5px;
}
.footer-links {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}
.footer-links a {
    position: relative;
    color: rgba(255, 255, 255, 0.78);
    text-decoration: none;
    font-size: 0.88rem;
    letter-spacing: 0.3px;
    padding: 0.35rem 0.75rem 0.4rem;
    border-radius: 10px;
    line-height: 1.2;
    transition:
        background 0.35s,
        color 0.35s;
}
.footer-links a:before {
    content: "";
    position: absolute;
    left: 0.75rem;
    right: 0.75rem;
    bottom: 0.3rem;
    height: 1px;
    background: linear-gradient(90deg, transparent, #6d79ff, transparent);
    opacity: 0;
    transform: scaleX(0.4);
    transition:
        opacity 0.4s,
        transform 0.45s;
    pointer-events: none;
}
.footer-links a:hover {
    background: rgba(255, 255, 255, 0.06);
    color: #f7f9ff;
}
.footer-links a:hover:before {
    opacity: 0.9;
    transform: scaleX(1);
}
.badges {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    justify-content: center;
    margin-bottom: 1.1rem;
}
.footer-copyright {
    opacity: 0.5;
    font-size: 0.85rem;
}
.badge {
    display: inline-block;
}
.version-badge {
    display: inline-block;
    background: rgba(255, 255, 255, 0.12);
    border: 1px solid rgba(255, 255, 255, 0.25);
    padding: 0.35rem 0.75rem;
    font-size: 0.75rem;
    border-radius: 30px;
    margin-left: 0.75rem;
    backdrop-filter: blur(6px);
}

/* ============================================
   Fixed Bottom Right Buttons Container
   ============================================ */
.fixed-buttons {
    position: fixed;
    right: 1.5rem;
    bottom: 1.5rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.75rem;
    z-index: 300;
}

/* ============================================
   Back to Top Button
   ============================================ */
#back-to-top {
    width: 3.25rem;
    height: 3.25rem;
    border-radius: 50%;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: #fff;
    border: none;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    box-shadow:
        0 4px 15px rgba(102, 126, 234, 0.4),
        0 8px 30px rgba(0, 0, 0, 0.3),
        inset 0 1px 0 rgba(255, 255, 255, 0.2);
    opacity: 0;
    transform: translateY(0.5rem);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    pointer-events: none;
    position: relative;
    overflow: hidden;
}
#back-to-top::before {
    content: "";
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, rgba(255, 255, 255, 0.2) 0%, transparent 50%);
    border-radius: 50%;
}
#back-to-top .back-icon {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 2px;
    filter: drop-shadow(0 1px 2px rgba(0, 0, 0, 0.2));
}
#back-to-top .back-arrow {
    font-size: 0.9rem;
    line-height: 1;
    animation: floatUp 1.5s ease-in-out infinite;
}
#back-to-top .back-line {
    width: 10px;
    height: 2px;
    background: currentColor;
    border-radius: 1px;
}
@keyframes floatUp {
    0%,
    100% {
        transform: translateY(0);
    }
    50% {
        transform: translateY(-3px);
    }
}
#back-to-top.visible {
    opacity: 1;
    transform: translateY(0);
    pointer-events: auto;
}
#back-to-top:hover {
    transform: translateY(-3px) scale(1.05);
    box-shadow:
        0 6px 20px rgba(102, 126, 234, 0.5),
        0 12px 40px rgba(0, 0, 0, 0.35),
        inset 0 1px 0 rgba(255, 255, 255, 0.25);
}
#back-to-top:active {
    transform: scale(0.92);
}

/* ============================================
   DTB Button Wrapper
   ============================================ */
.dtb-btn-wrapper {
    position: relative;
    display: flex;
    align-items: center;
}

/* ============================================
   DTB Switch Button (elegant design)
   ============================================ */
#dtb-switch-btn {
    width: 3.25rem;
    height: 3.25rem;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border: none;
    border-radius: 50%;
    color: #fff;
    font-size: 1.5rem;
    cursor: pointer;
    box-shadow:
        0 4px 15px rgba(102, 126, 234, 0.4),
        0 8px 30px rgba(0, 0, 0, 0.3),
        inset 0 1px 0 rgba(255, 255, 255, 0.2);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    z-index: 300;
    overflow: hidden;
}
#dtb-switch-btn::before {
    content: "";
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, rgba(255, 255, 255, 0.2) 0%, transparent 50%);
    border-radius: 50%;
}
#dtb-switch-btn:hover {
    transform: translateY(-3px) scale(1.05);
    box-shadow:
        0 6px 20px rgba(102, 126, 234, 0.5),
        0 12px 40px rgba(0, 0, 0, 0.35),
        inset 0 1px 0 rgba(255, 255, 255, 0.25);
}
#dtb-switch-btn:active,
#dtb-switch-btn.clicked {
    transform: scale(0.92);
    box-shadow:
        0 2px 10px rgba(102, 126, 234, 0.3),
        0 4px 15px rgba(0, 0, 0, 0.2);
}
#dtb-switch-btn .dtb-icon {
    font-size: 1.4rem;
    line-height: 1;
    filter: drop-shadow(0 1px 2px rgba(0, 0, 0, 0.2));
    animation: gentlePulse 3s ease-in-out infinite;
}
#dtb-switch-btn .dtb-label {
    display: none;
}
@keyframes gentlePulse {
    0%,
    100% {
        transform: scale(1);
    }
    50% {
        transform: scale(1.08);
    }
}

/* Arrow hint pointing to DTB button */
.dtb-arrow-hint {
    position: absolute;
    right: 100%;
    top: 50%;
    margin-right: 0.5rem;
    display: flex;
    align-items: center;
    gap: 0.3rem;
    color: rgba(255, 255, 255, 0.85);
    font-size: 0.85rem;
    opacity: 0;
    animation:
        arrowFadeIn 0.6s 1.5s forwards,
        arrowFloat 2s 2.1s ease-in-out infinite;
    pointer-events: none;
}
.dtb-arrow-hint .arrow-text {
    white-space: nowrap;
    text-shadow: 0 2px 10px rgba(0, 0, 0, 0.7);
    font-weight: 500;
}
@keyframes arrowFadeIn {
    from {
        opacity: 0;
        transform: translateY(-50%) translateX(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(-50%) translateX(0);
    }
}
@keyframes arrowFloat {
    0%,
    100% {
        transform: translateY(-50%) translateX(0);
    }
    50% {
        transform: translateY(-50%) translateX(5px);
    }
}
.dtb-arrow-hint.hidden {
    opacity: 0 !important;
    animation: none;
    transition: opacity 0.3s;
}

/* ============================================
   Animations
   ============================================ */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}
.fade-in {
    opacity: 0;
    transform: translate3d(0, 20px, 0);
    transition:
        opacity 0.5s ease-out,
        transform 0.5s ease-out;
    will-change: opacity, transform;
}
.fade-in.visible {
    opacity: 1;
    transform: translate3d(0, 0, 0);
}

/* Fallback for low-perf devices and iOS - show content immediately */
.dtb-perf-low .fade-in,
.dtb-ios .fade-in {
    opacity: 1 !important;
    transform: none !important;
    transition: none !important;
}

/* ============================================
   Unified Card Effects (qs-step, roadmap-item, api-logo)
   ============================================ */
.qs-step,
.roadmap-item,
.api-logo {
    --accent: var(--accent, #667eea);
    --accent-fade: color-mix(in srgb, var(--accent) 25%, transparent);
    position: relative;
    backdrop-filter: blur(14px) saturate(120%);
}
.qs-step,
.roadmap-item {
    background: linear-gradient(175deg, rgba(255, 255, 255, 0.07), rgba(255, 255, 255, 0.035));
    border: 1px solid rgba(255, 255, 255, 0.09);
    transition:
        background 0.45s,
        transform 0.45s cubic-bezier(0.4, 0.2, 0.2, 1),
        box-shadow 0.45s,
        border-color 0.45s;
}
.qs-step::before,
.roadmap-item::before {
    content: "";
    position: absolute;
    inset: 0;
    border-radius: inherit;
    padding: 1px;
    background: linear-gradient(140deg, var(--accent) 0%, rgba(255, 255, 255, 0.25) 55%, var(--accent) 110%);
    -webkit-mask:
        linear-gradient(#000 0 0) content-box,
        linear-gradient(#000 0 0);
    mask:
        linear-gradient(#000 0 0) content-box,
        linear-gradient(#000 0 0);
    -webkit-mask-composite: xor;
    mask-composite: exclude;
    opacity: 0;
    transition: opacity 0.55s;
    pointer-events: none;
}
.api-logo::after {
    content: "";
    position: absolute;
    inset: 0;
    border-radius: inherit;
    padding: 1px;
    background: linear-gradient(140deg, var(--accent) 0%, rgba(255, 255, 255, 0.25) 55%, var(--accent) 110%);
    -webkit-mask:
        linear-gradient(#000 0 0) content-box,
        linear-gradient(#000 0 0);
    mask:
        linear-gradient(#000 0 0) content-box,
        linear-gradient(#000 0 0);
    -webkit-mask-composite: xor;
    mask-composite: exclude;
    opacity: 0;
    transition: opacity 0.55s;
    pointer-events: none;
}
.qs-step::after,
.roadmap-item::after {
    content: "";
    position: absolute;
    top: -10%;
    left: -5%;
    width: 140%;
    height: 140%;
    background: radial-gradient(circle at 30% 25%, var(--accent-fade), transparent 60%);
    opacity: 0.18;
    mix-blend-mode: plus-lighter;
    pointer-events: none;
    transition: opacity 0.6s;
}
.qs-step:hover,
.roadmap-item:hover {
    transform: translateY(-6px) scale(1.012);
    box-shadow:
        0 16px 34px -10px rgba(0, 0, 0, 0.5),
        0 0 0 1px rgba(255, 255, 255, 0.14) inset,
        0 0 0 1px var(--accent-fade);
    border-color: rgba(255, 255, 255, 0.18);
    background: linear-gradient(175deg, rgba(255, 255, 255, 0.1), rgba(255, 255, 255, 0.045));
}
.qs-step:hover::before,
.roadmap-item:hover::before,
.api-logo:hover::after {
    opacity: 1;
}
.qs-step:hover::after,
.roadmap-item:hover::after {
    opacity: 0.32;
}
.roadmap-item:hover .ri-ico {
    filter: drop-shadow(0 2px 6px color-mix(in srgb, var(--accent) 55%, transparent));
}
.api-logo:hover {
    transform: translateY(-6px) scale(1.012);
    box-shadow:
        0 14px 30px -10px rgba(0, 0, 0, 0.55),
        0 0 0 1px rgba(255, 255, 255, 0.16) inset,
        0 0 0 1px var(--accent-fade);
    border-color: rgba(255, 255, 255, 0.18);
}
.roadmap-item .ri-ico {
    transition:
        filter 0.5s,
        transform 0.5s;
}
.roadmap-item:hover .ri-ico {
    transform: scale(1.12) rotate(-3deg);
}

/* ============================================
   Reduced Motion & Low Performance Mode
   ============================================ */
@media (prefers-reduced-motion: reduce) {
    .dynamic-bg,
    .particle,
    .hero::before,
    .hero h1 {
        animation: none !important;
    }
    .floating-particles {
        display: none;
    }
}
html.dtb-perf-low .dynamic-bg {
    animation: none !important;
    background-size: 200% 200%;
}
html.dtb-perf-low .floating-particles {
    display: none !important;
}
html.dtb-perf-low .wallpaper-overlay,
html.dtb-perf-low .header,
html.dtb-perf-low .install-method,
html.dtb-perf-low .feature-card,
html.dtb-perf-low .qs-step,
html.dtb-perf-low .roadmap-item,
html.dtb-perf-low .api-logo {
    backdrop-filter: none !important;
    -webkit-backdrop-filter: none !important;
}
html.dtb-perf-low .feature-card::before,
html.dtb-perf-low .feature-card::after,
html.dtb-perf-low .qs-step::before,
html.dtb-perf-low .qs-step::after,
html.dtb-perf-low .roadmap-item::before,
html.dtb-perf-low .roadmap-item::after,
html.dtb-perf-low .api-logo::after {
    display: none !important;
}
html.dtb-perf-low .feature-card:hover,
html.dtb-perf-low .qs-step:hover,
html.dtb-perf-low .roadmap-item:hover,
html.dtb-perf-low .api-logo:hover {
    transform: none !important;
    box-shadow: 0 6px 16px -8px rgba(0, 0, 0, 0.45);
}

/* ============================================
   Responsive Design
   ============================================ */
@media (max-width: 1024px) {
    .hero-grid {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
    .hero-stats {
        gap: 1.5rem;
    }
    .hero-stat-number {
        font-size: 1.75rem;
    }
}
@media (max-width: 768px) {
    .hero {
        padding: 2rem 0;
    }
    .hero-stats {
        flex-direction: column;
        gap: 1rem;
    }
    .hero-stat-divider {
        width: 60px;
        height: 1px;
    }
    .hero-title {
        font-size: clamp(2rem, 10vw, 3rem);
    }
    .hero-tagline {
        font-size: 1rem;
    }
    .hero-scroll-hint {
        display: none;
    }
    .hero-showcase {
        flex-direction: column;
        gap: 1rem;
    }
    .hero-img-wrap {
        max-width: 100%;
    }
    .hero-actions {
        flex-direction: row;
        flex-wrap: wrap;
        justify-content: center;
    }
    .hero-grid {
        gap: 1.5rem;
    }
    .hero-action-item {
        font-size: 0.68rem;
        padding: 0.4rem 0.6rem;
    }
    .cta-buttons {
        flex-direction: column;
        align-items: center;
    }
    .nav-links {
        gap: 0.5rem;
        flex-wrap: wrap;
        justify-content: flex-end;
    }
    .nav-links a:not(.icon-btn) {
        display: none;
    }
    /* Hide arrow hint on tablet and below */
    .dtb-arrow-hint {
        display: none;
    }
    .quickstart-steps {
        grid-template-columns: 1fr;
    }
    .statusbar-demo {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }
    .quickstart h2 {
        font-size: 2rem;
    }
    .features-grid,
    .faq-grid {
        grid-template-columns: 1fr;
    }
    .features h2 {
        font-size: 2.4rem;
    }
    .footer-content {
        grid-template-columns: 1fr;
        text-align: center;
    }
    .api-logos {
        grid-template-columns: repeat(2, 1fr);
    }
    .full-section {
        min-height: 90vh;
    }
    .container {
        padding: 0 clamp(12px, 3.5vw, 20px);
    }
    .nav {
        flex-wrap: wrap;
        gap: 1rem;
    }
    .hero {
        padding: clamp(6vh, 10vh, 12vh) 0 clamp(3rem, 8vh, 5rem);
    }
    .hero-title {
        font-size: clamp(2.2rem, 8vw, 3.2rem);
        line-height: 1.1;
    }
    .hero p {
        font-size: clamp(1rem, 3.5vw, 1.2rem);
        padding: 0 10px;
    }
    .btn {
        width: 100%;
        max-width: 280px;
        padding: 1rem 1.5rem;
        font-size: 1rem;
    }
    .feature-card {
        padding: 1.5rem 1.2rem;
        min-height: auto;
    }
    .demo-gallery {
        flex-direction: column;
        gap: 2rem;
    }
    .demo-item {
        max-width: 100%;
    }
    .install-method {
        padding: 2rem 1.5rem;
    }
    .faq-item {
        padding: 1.5rem 1.2rem;
    }
    h2 {
        font-size: clamp(2rem, 6vw, 2.5rem) !important;
    }
    h3 {
        font-size: clamp(1.2rem, 4vw, 1.4rem) !important;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 clamp(10px, 3vw, 15px);
    }
    .full-section {
        min-height: 85vh;
    }
    .nav-links {
        gap: 0.5rem;
    }
    .api-logos {
        grid-template-columns: 1fr;
        gap: 1rem;
    }
    .qs-step {
        min-height: auto;
        padding: 1.15rem 1rem 1rem;
    }
    .qs-step p {
        font-size: 0.75rem;
    }
    /* Hide arrow hint on small screens */
    .dtb-arrow-hint {
        display: none;
    }
    /* Adjust fixed buttons for small screens */
    .fixed-buttons {
        right: 1rem;
        bottom: 1rem;
        gap: 0.5rem;
    }
    #dtb-switch-btn {
        width: 2.75rem;
        height: 2.75rem;
    }
    #back-to-top {
        width: 2.5rem;
        height: 2.5rem;
        font-size: 1rem;
    }
}

@media (max-height: 800px) {
    .features {
        padding: 2.6rem 0 3rem;
    }
    .features-grid {
        gap: 1.6rem 1.4rem;
        margin-bottom: 2.4rem;
    }
    .feature-card {
        padding: 1.55rem 1.35rem 1.4rem;
        min-height: 205px;
    }
    .feature-icon {
        font-size: 1.5rem;
    }
    .feature-card h3 {
        font-size: 1.24rem;
    }
    .feature-card p {
        font-size: 0.88rem;
    }
}
@media (max-height: 750px) {
    .hero {
        padding: 3.2rem 0 4.2rem;
    }
}
@media (max-height: 600px) {
    .hero {
        padding: 2.6rem 0 3.2rem;
    }
    .hero-title {
        font-size: clamp(2.2rem, 6.5vw, 3.2rem);
    }
    .hero .subtitle {
        font-size: 1.4rem;
    }
    .hero p {
        font-size: 1.05rem;
    }
}
@media (max-width: 1100px) and (max-height: 900px) {
    .features-grid {
        grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    }
}
@media (max-width: 1250px) {
    .statusbar-preview figure {
        max-width: 600px;
        flex: 1 1 560px;
    }
    .statusbar-details {
        max-width: 380px !important;
    }
}
@media (max-width: 1080px) {
    .statusbar-preview {
        flex-direction: column;
        align-items: center;
    }
    .statusbar-preview figure {
        max-width: 640px;
        flex: 1 1 auto;
    }
    .statusbar-details {
        max-width: 600px !important;
        text-align: center;
    }
    .statusbar-actions {
        text-align: center !important;
    }
}
@media (max-width: 850px) {
    .statusbar-preview {
        --sb-gap: 1.6rem;
    }
}
@media (max-width: 680px) {
    .api-logos {
        gap: 1.15rem;
    }
    .api-logo {
        padding: 1.4rem 1.15rem 1.2rem;
        border-radius: 17px;
    }
    .api-logo-name {
        font-size: 1.05rem;
    }
    .api-logo > div:first-child {
        font-size: 2.1rem !important;
    }
}
@media (max-width: 640px) {
    .qs-step {
        min-height: auto;
        padding: 1.15rem 1rem 1rem;
    }
    .qs-step p {
        font-size: 0.75rem;
    }
}

/* ============================================
   Utility Classes
   ============================================ */
.install-help-text {
    text-align: center;
    margin-bottom: 2rem;
    opacity: 0.7;
}
.install-cta {
    text-align: center;
    margin-top: 1.5rem;
}
.btn-sm {
    padding: 0.75rem 1.4rem;
    font-size: 0.9rem;
}
#installation .features-subtitle {
    margin-bottom: 2.5rem;
}
#quickstart {
    padding: 6rem 0;
    background: rgba(0, 0, 0, 0.55);
}
#quickstart .features-subtitle {
    margin-bottom: 3rem;
}
#sources .sources-subtitle {
    margin-bottom: 2rem;
    opacity: 0.8;
}
#roadmap {
    background: rgba(0, 0, 0, 0.5);
}