/* ================= CSS Variables & Reset ================= */
:root {
    --brand-yellow: #FFC800;
    --brand-black: #111111;
    --brand-white: #FFFFFF;
    --text-dark: #222222;
    --text-gray: #666666;
    --text-light: #AAAAAA;
    --bg-light: #F9F9F9;
    --bg-warm: #F0F0EC;
    --bg-dark: #1a1a1a;
    --font-display: 'Raleway', sans-serif;
    --font-body: 'Roboto', sans-serif;
    --font-handwriting: 'Caveat', cursive;
    /* Fixed top bar height: matches .top-nav footprint; used for sticky tab bar and mobile dropdown alignment */
    --site-header-height: 65px;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
    font-family: var(--font-body);
    color: var(--brand-black);
    background-color: var(--bg-light);
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
}

a { text-decoration: none; color: inherit; }
ul { list-style: none; }

/* ================= Top Nav ================= */
.top-nav {
    position: fixed;
    top: 0; left: 0; width: 100%;
    display: flex; justify-content: space-between; align-items: center;
    padding: 30px 5%; z-index: 1000;
    transition: all 0.3s ease;
    isolation: isolate;
}

.top-nav.scrolled {
    background-color: rgba(17, 17, 17, 0.98);
    padding: 20px 5%;
    box-shadow: 0 5px 20px rgba(0,0,0,0.1);
}

.nav-brand {
    position: relative;
    z-index: 2;
    font-family: var(--font-display); font-weight: 900; font-size: 24px;
    color: var(--brand-yellow); letter-spacing: 2px;
}

.nav-menu { display: flex; align-items: center; gap: 30px; }

.nav-menu a {
    font-family: var(--font-body); font-size: 12px; font-weight: 700;
    color: var(--brand-white); text-transform: uppercase; letter-spacing: 1px;
    position: relative; padding-bottom: 5px;
}

.nav-menu a:hover, .nav-menu a.active { color: var(--brand-yellow); }
.nav-menu a::after {
    content: ''; position: absolute; bottom: 0; left: 0;
    width: 0; height: 2px; background-color: var(--brand-yellow);
    transition: width 0.3s ease;
}
.nav-menu a:hover::after, .nav-menu a.active::after { width: 100%; }

.lang-switch {
    position: relative; font-size: 11px; color: rgba(255,255,255,0.7);
    border-left: 1px solid rgba(255,255,255,0.2); padding-left: 15px; cursor: pointer;
    user-select: none;
}
.lang-current { white-space: nowrap; }
.lang-current:hover { color: var(--brand-yellow); }
.lang-dropdown {
    display: none; position: absolute; top: calc(100% + 12px); right: 0;
    background-color: rgba(17,17,17,0.97); border: 1px solid rgba(255,255,255,0.1);
    list-style: none; margin: 0; padding: 6px 0; min-width: 110px; z-index: 999;
}
.lang-dropdown.open { display: block; }
.lang-dropdown li a {
    display: block; padding: 8px 16px; font-size: 12px;
    color: rgba(255,255,255,0.7); text-decoration: none; white-space: nowrap;
}
.lang-dropdown li a:hover,
.lang-dropdown li a.active { color: var(--brand-yellow); background: rgba(255,255,255,0.04); }

.mobile-menu-btn {
    display: none;
    position: relative;
    z-index: 2;
    width: 44px; height: 44px; padding: 0; margin: 0;
    cursor: pointer; background: none; border: none;
    flex-shrink: 0;
    align-items: center; justify-content: center;
    flex-direction: column; gap: 6px;
    color: var(--brand-white);
    -webkit-tap-highlight-color: transparent;
}
.mobile-menu-btn .hamburger-line {
    display: block; width: 22px; height: 2px;
    background-color: currentColor; border-radius: 1px;
    transition: transform 0.38s cubic-bezier(0.16, 1, 0.3, 1), opacity 0.25s ease;
    transform-origin: center;
}
.mobile-menu-btn.is-open .hamburger-line:nth-child(1) {
    transform: translateY(8px) rotate(45deg);
}
.mobile-menu-btn.is-open .hamburger-line:nth-child(2) {
    opacity: 0; transform: scaleX(0);
}
.mobile-menu-btn.is-open .hamburger-line:nth-child(3) {
    transform: translateY(-8px) rotate(-45deg);
}

.nav-backdrop {
    display: none;
}

/* ================= Hero Section ================= */
.hero-section {
    position: relative; height: 100vh; width: 100%;
    background-image: linear-gradient(rgba(17,17,17,0.3), rgba(17,17,17,0.85)),
        url('../../../assets/images/main-hero-bg.jpg');
    background-size: cover; background-position: center; background-attachment: scroll;
    display: flex; align-items: center; justify-content: center; z-index: 1;
}

.hero-title-container { text-align: center; }

.mega-title {
    font-family: var(--font-display); font-weight: 100; font-size: 9vw;
    color: var(--brand-white); letter-spacing: 0.15em; text-transform: uppercase;
    line-height: 1; margin-left: 0.15em;
}

.mega-subtitle {
    font-family: var(--font-display); font-weight: 300; font-size: 1.2vw;
    color: var(--brand-yellow); letter-spacing: 0.5em; text-transform: uppercase;
    margin-top: 20px;
}

.mega-subtitle-cn {
    font-family: var(--font-body); font-weight: 300; font-size: 14px;
    color: rgba(255,255,255,0.55); letter-spacing: 5px;
    margin-top: 14px; display: block;
}

.hero-badges {
    display: flex; justify-content: center; gap: 20px; margin-top: 30px;
    flex-wrap: wrap;
}

.hero-badge {
    font-size: 11px; font-weight: 700; letter-spacing: 1.5px;
    text-transform: uppercase; color: rgba(255,255,255,0.5);
    border: 1px solid rgba(255,255,255,0.15); padding: 6px 14px;
}

.scroll-indicator {
    position: absolute; bottom: 40px; left: 50%; transform: translateX(-50%);
    display: flex; flex-direction: column; align-items: center; gap: 10px;
    color: rgba(255,255,255,0.5); font-size: 12px; letter-spacing: 2px;
    animation: bounce 2s infinite;
}
.scroll-indicator::after {
    content: ''; width: 1px; height: 40px; background-color: var(--brand-yellow);
}
@keyframes bounce {
    0%, 20%, 50%, 80%, 100% { transform: translateY(0) translateX(-50%); }
    40% { transform: translateY(-10px) translateX(-50%); }
    60% { transform: translateY(-5px) translateX(-50%); }
}

/* ================= Stats Bar ================= */
.stats-bar {
    background-color: var(--brand-black);
    padding: 55px 5%;
    border-bottom: 4px solid var(--brand-yellow);
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    max-width: 1200px;
    margin: 0 auto;
}

.stat-item {
    display: flex; flex-direction: column; align-items: center;
    padding: 10px 20px;
    border-right: 1px solid rgba(255,255,255,0.08);
}
.stat-item:last-child { border-right: none; }

.stat-num {
    font-family: var(--font-display);
    font-size: 52px; font-weight: 900;
    color: var(--brand-yellow); line-height: 1; margin-bottom: 10px;
}

.stat-label {
    font-size: 11px; color: rgba(255,255,255,0.4);
    text-transform: uppercase; letter-spacing: 2px; text-align: center;
}

/* ================= General Layout ================= */
.main-content { padding: 80px 0; overflow: hidden; }
.container { max-width: 1400px; margin: 0 auto; padding: 0 5%; }
.section-margin { margin-bottom: 120px; }

.editorial-title {
    font-family: var(--font-display); font-weight: 200; font-size: 56px;
    text-transform: uppercase; letter-spacing: 2px; line-height: 1.1; margin-bottom: 20px;
    color: var(--brand-black);
}
.editorial-title span { font-weight: 700; color: var(--brand-yellow); }
.editorial-desc { font-size: 16px; font-weight: 400; line-height: 1.8; color: var(--text-gray); max-width: 600px; }

.section-header {
    display: flex; justify-content: space-between; align-items: flex-end;
    margin-bottom: 60px; flex-wrap: wrap; gap: 20px;
}

.section-header-link {
    font-size: 12px; font-weight: 700; text-transform: uppercase;
    letter-spacing: 2px; color: var(--brand-black);
    border-bottom: 2px solid var(--brand-yellow); padding-bottom: 3px;
    white-space: nowrap; transition: color 0.3s;
}
.section-header-link:hover { color: var(--brand-yellow); }

/* ================= Section 1: Core Features ================= */
.feature-panel { display: flex; justify-content: flex-end; padding: 0 5%; }
.content-block {
    width: 65%; max-width: 900px; padding: 80px; position: relative;
    background-color: var(--brand-yellow); color: var(--brand-black);
    box-shadow: 0 30px 60px rgba(0,0,0,0.08);
}
.content-block .editorial-title { color: var(--brand-black); }
.content-block .editorial-title span { color: var(--brand-white); }
.content-block .editorial-desc { color: var(--text-dark); font-weight: 500; }

.feature-list { display: flex; flex-direction: column; gap: 38px; margin-top: 50px; }
.feature-item { display: flex; align-items: flex-start; gap: 20px; }
.feature-icon {
    width: 45px; height: 45px; flex-shrink: 0; background-color: var(--brand-black);
    color: var(--brand-yellow); border-radius: 50%;
    display: flex; align-items: center; justify-content: center;
}
.feature-item h3 { font-size: 17px; font-weight: 900; text-transform: uppercase; margin-bottom: 8px; letter-spacing: 0.5px; }
.feature-item p { font-size: 14px; line-height: 1.65; }

/* ================= Section 2: Use Cases ================= */
.offset-section { position: relative; padding: 100px 5%; display: flex; align-items: center; }
.offset-image { width: 60%; height: 600px; object-fit: cover; filter: grayscale(80%) contrast(1.2); box-shadow: 0 20px 40px rgba(0,0,0,0.1); }
.offset-content {
    width: 45%; background-color: var(--brand-black); color: var(--brand-white);
    padding: 80px 60px; position: absolute; right: 5%; top: 50%; transform: translateY(-50%);
    border-top: 5px solid var(--brand-yellow); box-shadow: -20px 20px 0 rgba(255,200,0,0.8);
}
.offset-content .editorial-title { color: var(--brand-white); }
.offset-content .editorial-desc { color: var(--text-light); }

.scenario-list { margin-top: 40px; border-top: 1px solid rgba(255,255,255,0.1); }
.scenario-item { padding: 18px 0; border-bottom: 1px solid rgba(255,255,255,0.1); display: flex; justify-content: space-between; align-items: center; }
.scenario-item h4 { font-family: var(--font-display); font-size: 22px; font-weight: 300; letter-spacing: 1px; }
.scenario-item span { color: var(--brand-yellow); font-family: var(--font-handwriting); font-size: 18px; }

/* ================= Platform Section ================= */
.platform-section { padding: 120px 5%; background-color: var(--bg-warm); }
.platform-section .editorial-title { color: var(--brand-black); }
.platform-section .editorial-title span { color: var(--brand-yellow); }

.platform-grid {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 20px;
}

.platform-card {
    background-color: var(--brand-white);
    border: 1px solid rgba(0,0,0,0.08);
    padding: 36px 24px; position: relative; overflow: hidden;
    transition: all 0.35s ease;
}
.platform-card::before {
    content: ''; position: absolute; top: 0; left: 0;
    width: 0; height: 4px; background-color: var(--brand-yellow);
    transition: width 0.35s ease;
}
.platform-card:hover::before { width: 100%; }
.platform-card:hover { box-shadow: 0 20px 50px rgba(0,0,0,0.1); transform: translateY(-6px); }

.platform-icon { width: 40px; height: 40px; margin-bottom: 18px; color: var(--brand-black); }

.platform-name {
    font-family: var(--font-display); font-size: 20px; font-weight: 900;
    text-transform: uppercase; letter-spacing: 1px; margin-bottom: 10px; color: var(--brand-black);
}

.platform-client {
    font-size: 10px; font-weight: 700; text-transform: uppercase; letter-spacing: 1px;
    margin-bottom: 18px; display: inline-block;
    background-color: var(--brand-black); color: var(--brand-yellow); padding: 3px 8px;
}

.platform-feature-list { margin-top: 14px; }
.platform-feature-list li {
    font-size: 12px; color: var(--text-gray);
    padding: 4px 0 4px 14px; position: relative; line-height: 1.5;
}
.platform-feature-list li::before { content: '▪'; position: absolute; left: 0; color: var(--brand-yellow); }

/* ================= Section 3: Protocol Support ================= */
.typo-section { background-color: var(--brand-yellow); padding: 100px 0; }
.typo-container { max-width: 1400px; margin: 0 auto; padding: 0 5%; }
.typo-header { display: flex; justify-content: space-between; align-items: flex-end; margin-bottom: 60px; border-bottom: 2px solid var(--brand-black); padding-bottom: 20px; }
.typo-header h2 { font-family: var(--font-display); font-size: 60px; font-weight: 900; line-height: 1; color: var(--brand-black); }

.protocol-row {
    display: flex; align-items: center; padding: 28px 0;
    border-bottom: 1px solid rgba(0,0,0,0.1); transition: all 0.3s;
}
.protocol-row:hover { padding-left: 20px; background-color: rgba(0,0,0,0.03); }
.protocol-num {
    font-family: var(--font-display); font-size: 80px; font-weight: 900; color: transparent;
    -webkit-text-stroke: 1px var(--brand-black); width: 120px; line-height: 0.8; flex-shrink: 0;
}
.protocol-info { flex: 1; }
.protocol-info h3 { font-size: 26px; font-weight: 900; margin-bottom: 5px; text-transform: uppercase; color: var(--brand-black); }
.protocol-info p { font-size: 14px; color: var(--text-dark); font-weight: 500; line-height: 1.6; }

/* ================= Trust & Security Section ================= */
.trust-section { background-color: var(--brand-black); padding: 100px 5%; }
.trust-section .editorial-title { color: var(--brand-white); }
.trust-section .editorial-title span { color: var(--brand-yellow); }
.trust-section .editorial-desc { color: rgba(255,255,255,0.45); }

.trust-grid {
    display: grid; grid-template-columns: repeat(3, 1fr);
    gap: 60px; max-width: 1200px; margin: 60px auto 0;
}

.trust-item { border-left: 3px solid var(--brand-yellow); padding-left: 30px; }

.trust-icon-wrap {
    width: 50px; height: 50px; background-color: var(--brand-yellow);
    border-radius: 50%; display: flex; align-items: center; justify-content: center;
    margin-bottom: 20px; color: var(--brand-black);
}

.trust-title {
    font-family: var(--font-display); font-size: 22px; font-weight: 700;
    color: var(--brand-white); margin-bottom: 12px;
    text-transform: uppercase; letter-spacing: 1px;
}

.trust-text { font-size: 14px; color: rgba(255,255,255,0.5); line-height: 1.8; }

/* ================= Section 4: How It Works ================= */
.workflow-section { padding: 120px 5%; background-color: transparent; }
.workflow-section .editorial-title { color: var(--brand-black); }
.workflow-section .editorial-desc { color: var(--text-gray); }

.magazine-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 40px; margin-top: 60px; }
.magazine-col { border-left: 1px solid rgba(0,0,0,0.1); padding-left: 30px; position: relative; }
.magazine-col::before {
    content: ''; position: absolute; top: 0; left: -1px; width: 1px; height: 50px; background-color: var(--brand-yellow);
}
.col-step { font-family: var(--font-display); font-size: 14px; color: var(--brand-yellow); letter-spacing: 2px; margin-bottom: 15px; display: block; font-weight: 700; }
.col-title { font-family: var(--font-display); font-size: 32px; font-weight: 300; color: var(--brand-black); margin-bottom: 20px; line-height: 1.2; }
.col-text { font-size: 14px; color: var(--text-gray); line-height: 1.8; }

/* ================= Testimonials Section ================= */
.testimonials-section { background-color: var(--brand-yellow); padding: 100px 5%; }
.testimonials-section .editorial-title { color: var(--brand-black); text-align: center; }
.testimonials-section .editorial-title span { color: rgba(0,0,0,0.25); }

.testimonial-grid {
    display: grid; grid-template-columns: repeat(3, 1fr);
    gap: 30px; max-width: 1200px; margin: 0 auto;
}

.testimonial-card {
    background-color: var(--brand-white); padding: 40px;
    box-shadow: 0 10px 40px rgba(0,0,0,0.08); position: relative;
}

.testimonial-quote-mark {
    font-family: var(--font-display); font-size: 90px; font-weight: 900;
    color: var(--brand-yellow); line-height: 0.7; margin-bottom: 15px;
    display: block; opacity: 0.7;
}

.testimonial-text { font-size: 15px; line-height: 1.8; color: var(--text-dark); margin-bottom: 25px; }

.testimonial-divider { width: 40px; height: 3px; background-color: var(--brand-yellow); margin-bottom: 16px; }

.testimonial-author {
    font-family: var(--font-display); font-size: 14px; font-weight: 900;
    text-transform: uppercase; letter-spacing: 1px; color: var(--brand-black);
}

.testimonial-role { font-size: 12px; color: var(--text-gray); margin-top: 4px; }

/* ================= Section 5: Download ================= */
.download-panel { display: flex; justify-content: flex-start; padding: 0 5%; }
.download-block {
    width: 70%; max-width: 1000px; padding: 100px; background-color: var(--brand-black);
    color: var(--brand-white); box-shadow: 0 30px 60px rgba(0,0,0,0.15);
}
.download-block .editorial-title { color: var(--brand-white); }
.download-block .editorial-desc { color: var(--text-light); }

.dl-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 25px; margin-top: 50px; }

.dl-btn {
    display: flex; flex-direction: column; padding: 25px; border: 1px solid rgba(255,255,255,0.2);
    transition: all 0.3s; position: relative; overflow: hidden;
}
.dl-btn::before {
    content: ''; position: absolute; top: 0; left: 0; width: 100%; height: 100%;
    background-color: var(--brand-yellow); transform: translateX(-101%); transition: transform 0.4s ease; z-index: 0;
}
.dl-btn:hover::before { transform: translateX(0); }
.dl-btn:hover { border-color: var(--brand-yellow); }
.dl-btn > * { position: relative; z-index: 1; transition: color 0.3s; }
.dl-btn:hover > * { color: var(--brand-black) !important; }
.dl-os { font-family: var(--font-display); font-size: 22px; font-weight: 700; margin-bottom: 5px; }
.dl-desc { font-size: 12px; color: var(--text-light); font-weight: 300; }

/* ================= Blog Preview ================= */
.blog-preview { padding: 120px 5%; background-color: transparent; }
.blog-preview .editorial-title { color: var(--brand-black); }
.blog-preview .editorial-title span { color: var(--brand-yellow); }

.blog-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 35px; margin-top: 60px; }

.blog-card {
    border: 1px solid rgba(0,0,0,0.08); overflow: hidden;
    transition: all 0.3s; background-color: var(--brand-white);
    display: block; color: inherit;
}
.blog-card:hover { box-shadow: 0 20px 50px rgba(0,0,0,0.1); transform: translateY(-6px); }

.blog-thumb {
    width: 100%; height: 210px; object-fit: cover;
    filter: grayscale(60%); transition: filter 0.4s; display: block;
}
.blog-card:hover .blog-thumb { filter: grayscale(0%); }

.blog-body { padding: 30px; }

.blog-tag {
    display: inline-block; background-color: var(--brand-yellow); color: var(--brand-black);
    font-size: 10px; font-weight: 900; text-transform: uppercase;
    letter-spacing: 2px; padding: 4px 10px; margin-bottom: 12px;
}

.blog-date { font-size: 11px; color: var(--text-light); display: block; margin-bottom: 10px; }

.blog-card-title {
    font-family: var(--font-display); font-size: 19px; font-weight: 700;
    color: var(--brand-black); line-height: 1.35; margin-bottom: 12px;
}

.blog-excerpt { font-size: 13px; color: var(--text-gray); line-height: 1.7; margin-bottom: 20px; }

.blog-read-more {
    font-size: 11px; font-weight: 700; text-transform: uppercase; letter-spacing: 2px;
    color: var(--brand-black); border-bottom: 2px solid var(--brand-yellow);
    padding-bottom: 2px; display: inline-block; transition: color 0.3s;
}
.blog-card:hover .blog-read-more { color: var(--brand-yellow); }

/* ================= CTA Banner ================= */
.cta-section {
    background-color: var(--brand-black);
    padding: 130px 5%; text-align: center;
    position: relative; overflow: hidden;
}
.cta-section::before {
    content: 'CLASH';
    position: absolute; top: 50%; left: 50%; transform: translate(-50%, -50%);
    font-family: var(--font-display); font-size: 22vw; font-weight: 900;
    color: transparent; -webkit-text-stroke: 1px rgba(255,255,255,0.03);
    pointer-events: none; white-space: nowrap;
}
.cta-inner { position: relative; z-index: 1; }

.cta-label {
    font-family: var(--font-display); font-size: 11px; color: var(--brand-yellow);
    text-transform: uppercase; letter-spacing: 5px; margin-bottom: 20px; display: block;
}

.cta-title {
    font-family: var(--font-display); font-size: 68px; font-weight: 100;
    color: var(--brand-white); line-height: 1; margin-bottom: 20px;
}
.cta-title strong { font-weight: 900; color: var(--brand-yellow); display: block; }

.cta-desc {
    font-size: 16px; color: rgba(255,255,255,0.45);
    max-width: 480px; margin: 0 auto 40px; line-height: 1.8;
}

.cta-btn {
    display: inline-block; background-color: var(--brand-yellow);
    color: var(--brand-black); font-family: var(--font-display);
    font-size: 13px; font-weight: 900; text-transform: uppercase;
    letter-spacing: 3px; padding: 18px 50px; transition: all 0.3s;
}
.cta-btn:hover { background-color: var(--brand-white); transform: translateY(-3px); box-shadow: 0 10px 30px rgba(255,200,0,0.3); }

/* ================= FAQ Section ================= */
.faq-wrapper { background-color: var(--brand-black); width: 100%; padding: 100px 0; margin-bottom: 0; }
.faq-section { padding: 0 5%; max-width: 1000px; margin: 0 auto; color: var(--brand-white); }
.faq-section .editorial-title { color: var(--brand-white); }
.faq-item { border-bottom: 1px solid rgba(255,255,255,0.08); padding: 38px 0; }
.faq-q { font-family: var(--font-display); font-size: 28px; font-weight: 300; margin-bottom: 15px; color: var(--brand-yellow); cursor: pointer; }
.faq-a { font-size: 15px; color: var(--text-light); line-height: 1.8; padding-left: 40px; border-left: 2px solid rgba(255,255,255,0.1); }

/* Inline code on dark FAQ band (overrides docs.css global `code`) */
.faq-wrapper .faq-a code {
    background-color: rgba(255, 255, 255, 0.12);
    color: #f2f2f2;
    border: 1px solid rgba(255, 255, 255, 0.18);
}

.cta-title.cta-title--dual .cta-title-line { display: block; }
.cta-title.cta-title--dual .cta-title-line + .cta-title-line { margin-top: 0.35em; }
.cta-title.cta-title--dual strong { display: inline; }
.cta-title-link {
    color: inherit;
    text-decoration: none;
    border-bottom: 2px solid rgba(255, 200, 0, 0.55);
    transition: color 0.2s, border-color 0.2s;
}
.cta-title-link:hover {
    color: var(--brand-white);
    border-bottom-color: var(--brand-yellow);
}

/* ================= Footer ================= */
.footer {
    background-color: #050505; color: #666; padding: 80px 5% 40px;
    border-top: 5px solid var(--brand-yellow);
}
.footer-top { display: flex; justify-content: space-between; align-items: flex-start; margin-bottom: 60px; border-bottom: 1px solid rgba(255,255,255,0.05); padding-bottom: 60px; }
.f-brand { font-family: var(--font-display); font-size: 48px; font-weight: 900; color: var(--brand-white); line-height: 1; margin-bottom: 20px; }
.f-links { display: flex; gap: 60px; }
.f-col h5 { color: var(--brand-white); font-size: 14px; margin-bottom: 20px; letter-spacing: 1px; text-transform: uppercase; }
.f-col ul { display: flex; flex-direction: column; gap: 12px; font-size: 13px; }
.f-col a:hover { color: var(--brand-yellow); }
.footer-bottom { display: flex; justify-content: space-between; font-size: 12px; text-transform: uppercase; }

/* ================= Responsive ================= */
@media (max-width: 1200px) {
    .platform-grid { grid-template-columns: repeat(3, 1fr); gap: 16px; }
}

@media (max-width: 1024px) {
    .mega-title { font-size: 12vw; }
    .content-block, .download-block { width: 85%; padding: 60px 40px; }
    .offset-image { width: 100%; height: 400px; }
    .offset-content { width: 90%; position: relative; right: auto; top: -50px; transform: none; margin: 0 auto; padding: 40px; }
    .magazine-grid { grid-template-columns: 1fr; gap: 60px; }
    .trust-grid { grid-template-columns: 1fr; gap: 50px; }
    .testimonial-grid { grid-template-columns: 1fr 1fr; gap: 25px; }
    .blog-grid { grid-template-columns: 1fr 1fr; }
    .dl-grid { grid-template-columns: repeat(2, 1fr); }
    .cta-title { font-size: 50px; }
    .editorial-title { font-size: 44px; }
}

/* ================= Download Page Hero ================= */
.dl-page-hero {
    background-color: var(--brand-black);
    padding: 160px 5% 90px;
    border-bottom: 4px solid var(--brand-yellow);
    position: relative;
    overflow: hidden;
}
.dl-page-hero::before {
    content: 'DOWNLOAD';
    position: absolute; top: 50%; left: 50%;
    transform: translate(-50%, -50%);
    font-family: var(--font-display); font-size: 18vw; font-weight: 900;
    color: transparent; -webkit-text-stroke: 1px rgba(255,255,255,0.03);
    pointer-events: none; white-space: nowrap;
}
.dl-hero-inner { position: relative; z-index: 1; max-width: 900px; }
.dl-hero-label {
    display: block; font-family: var(--font-display); font-size: 11px;
    color: var(--brand-yellow); text-transform: uppercase; letter-spacing: 5px; margin-bottom: 24px;
}
.dl-hero-title {
    font-family: var(--font-display); font-weight: 100;
    font-size: clamp(48px, 8vw, 100px); color: var(--brand-white);
    text-transform: uppercase; letter-spacing: 2px; line-height: 1; margin-bottom: 24px;
}
.dl-hero-title span { font-weight: 900; color: var(--brand-yellow); }
.dl-hero-desc { font-size: 16px; color: rgba(255,255,255,0.5); line-height: 1.8; max-width: 600px; margin-bottom: 32px; }
.dl-hero-badges { display: flex; gap: 16px; flex-wrap: wrap; }
.dl-hero-badge {
    font-size: 11px; font-weight: 700; letter-spacing: 1.5px; text-transform: uppercase;
    color: rgba(255,255,255,0.5); border: 1px solid rgba(255,255,255,0.15); padding: 6px 14px;
}

/* ================= Download Page Tab Nav ================= */
.dl-tab-nav {
    position: sticky; top: var(--site-header-height);
    background-color: var(--bg-warm);
    z-index: 100; border-bottom: 2px solid rgba(0,0,0,0.06);
}
.dl-tabs-wrap {
    max-width: 1400px; margin: 0 auto; padding: 0 5%;
    display: flex; overflow-x: auto;
    scrollbar-width: none; -ms-overflow-style: none;
}
.dl-tabs-wrap::-webkit-scrollbar { display: none; }
.dl-tab {
    display: flex; align-items: center; gap: 8px; flex-shrink: 0;
    padding: 20px 24px; font-family: var(--font-display); font-weight: 700;
    font-size: 12px; text-transform: uppercase; letter-spacing: 2px;
    border: none; background: none; cursor: pointer; color: var(--text-gray);
    border-bottom: 3px solid transparent; transition: all 0.25s;
}
.dl-tab:hover { color: var(--brand-black); }
.dl-tab.active { color: var(--brand-black); border-bottom-color: var(--brand-yellow); }

/* ================= Download Page Panels ================= */
.dl-main.main-content { padding: 0; }
.dl-panel { display: none; }
.dl-panel.active { display: block; }
.dl-panel-inner { max-width: 1400px; margin: 0 auto; padding: 80px 5%; }
.dl-panel-header {
    display: flex; justify-content: space-between; align-items: flex-start;
    gap: 40px; margin-bottom: 60px; flex-wrap: wrap;
}
.dl-panel-info {
    flex-shrink: 0; background-color: var(--brand-black);
    padding: 28px 36px; min-width: 280px; border-top: 4px solid var(--brand-yellow);
}
.dl-info-item {
    display: flex; flex-direction: column; gap: 4px;
    padding: 12px 0; border-bottom: 1px solid rgba(255,255,255,0.08);
}
.dl-info-item:last-child { border-bottom: none; }
.dl-info-label { font-size: 10px; font-weight: 700; text-transform: uppercase; letter-spacing: 2px; color: var(--brand-yellow); }
.dl-info-val { font-size: 13px; color: rgba(255,255,255,0.7); font-weight: 400; }

/* ================= Client Cards Grid ================= */
.client-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 30px; }
.client-card {
    background-color: var(--brand-white); border: 1px solid rgba(0,0,0,0.08);
    padding: 40px; position: relative; overflow: hidden; transition: all 0.3s;
}
.client-card::before {
    content: ''; position: absolute; top: 0; left: 0; width: 0; height: 4px;
    background-color: var(--brand-yellow); transition: width 0.35s ease;
}
.client-card:hover::before { width: 100%; }
.client-card:hover { box-shadow: 0 20px 50px rgba(0,0,0,0.08); }
.client-card-legacy { opacity: 0.8; }
.client-card-legacy::before { background-color: var(--text-light); }
.client-card-head {
    display: flex; align-items: center; gap: 10px;
    margin-bottom: 14px; flex-wrap: wrap;
}
.client-name {
    font-family: var(--font-display); font-size: 22px; font-weight: 700;
    text-transform: uppercase; letter-spacing: 0.5px; color: var(--brand-black); flex-shrink: 0;
}
.client-tag {
    font-size: 10px; font-weight: 900; text-transform: uppercase;
    letter-spacing: 1px; padding: 3px 9px; flex-shrink: 0;
}
.client-tag.recommended { background-color: var(--brand-yellow); color: var(--brand-black); }
.client-tag.legacy { background-color: rgba(0,0,0,0.08); color: var(--text-gray); }
.client-gh-link {
    display: inline-flex; align-items: center; gap: 5px;
    font-size: 11px; font-weight: 700; text-transform: uppercase; letter-spacing: 1px;
    color: var(--text-gray); border-bottom: 1px solid rgba(0,0,0,0.15);
    padding-bottom: 1px; margin-left: auto; transition: all 0.2s;
}
.client-gh-link:hover { color: var(--brand-black); border-bottom-color: var(--brand-black); }
.client-gh-dead {
    font-size: 11px; color: var(--text-light);
    text-transform: uppercase; letter-spacing: 0.5px; margin-left: auto;
}
.client-desc { font-size: 14px; line-height: 1.75; color: var(--text-gray); margin-bottom: 24px; }
.client-dl-list { display: flex; flex-direction: column; gap: 10px; list-style: none; }
.client-dl-btn {
    display: flex; align-items: center; gap: 0;
    background-color: var(--brand-black); color: var(--brand-white);
    font-family: var(--font-body); font-size: 13px; font-weight: 500;
    transition: all 0.3s; position: relative; overflow: hidden;
    border: 1px solid var(--brand-black); text-decoration: none;
}
.client-dl-btn::before {
    content: ''; position: absolute; top: 0; left: 0; width: 100%; height: 100%;
    background-color: var(--brand-yellow); transform: translateX(-101%);
    transition: transform 0.35s ease; z-index: 0;
}
.client-dl-btn:hover::before { transform: translateX(0); }
.client-dl-btn > * { position: relative; z-index: 1; transition: color 0.3s; }
.client-dl-btn:hover { border-color: var(--brand-yellow); color: var(--brand-black); }
.client-dl-icon {
    width: 46px; height: 46px; flex-shrink: 0;
    background-color: var(--brand-yellow); color: var(--brand-black);
    display: flex; align-items: center; justify-content: center;
    font-size: 20px; font-weight: 900; transition: background-color 0.3s;
}
.client-dl-btn:hover .client-dl-icon { background-color: var(--brand-black); color: var(--brand-yellow); }
.client-dl-info { display: flex; flex-direction: column; gap: 2px; padding: 10px 16px; }
.client-dl-arch { font-weight: 700; font-size: 13px; line-height: 1.3; }
.client-dl-ext { font-size: 11px; opacity: 0.55; font-family: monospace; }

/* ================= Notice Banners ================= */
.android-notice, .core-notice {
    display: flex; align-items: flex-start; gap: 12px;
    background-color: rgba(255,200,0,0.1); border-left: 4px solid var(--brand-yellow);
    padding: 18px 24px; margin-bottom: 40px;
    font-size: 13px; line-height: 1.7; color: var(--text-dark);
}
.android-notice svg, .core-notice svg { flex-shrink: 0; margin-top: 2px; }

/* ================= iOS Panel ================= */
.ios-notice-box {
    display: flex; align-items: flex-start; gap: 16px;
    background-color: var(--bg-warm); border-left: 5px solid var(--brand-black);
    padding: 28px 36px; margin-bottom: 40px;
}
.ios-notice-box svg { flex-shrink: 0; margin-top: 3px; }
.ios-notice-box p { font-size: 15px; line-height: 1.8; color: var(--text-dark); }
.ios-app-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 28px; }
.ios-app-card {
    background-color: var(--brand-white); border: 1px solid rgba(0,0,0,0.08);
    padding: 36px; transition: all 0.3s; position: relative;
}
.ios-app-card::before {
    content: ''; position: absolute; top: 0; left: 0;
    width: 0; height: 4px; background-color: var(--brand-black); transition: width 0.35s;
}
.ios-app-card:hover::before { width: 100%; }
.ios-app-card:hover { box-shadow: 0 20px 40px rgba(0,0,0,0.06); }
.ios-store-notice {
    display: flex; align-items: center; gap: 8px;
    margin-top: 20px; padding: 12px 16px; background-color: var(--bg-warm);
    font-size: 12px; font-weight: 700; color: var(--text-gray);
    text-transform: uppercase; letter-spacing: 0.5px; border-left: 3px solid var(--brand-black);
}

/* ================= Core / Kernel Tables ================= */
.core-tables-wrap { display: flex; flex-direction: column; gap: 50px; }
.core-os-title {
    display: flex; align-items: center; gap: 10px;
    font-family: var(--font-display); font-size: 20px; font-weight: 700;
    text-transform: uppercase; letter-spacing: 2px; color: var(--brand-black);
    margin-bottom: 16px; padding-bottom: 12px; border-bottom: 2px solid var(--brand-yellow);
}
.core-table-wrap { overflow-x: auto; }
.core-table { width: 100%; border-collapse: collapse; font-size: 14px; min-width: 560px; }
.core-table th {
    background-color: var(--brand-black); color: var(--brand-yellow);
    font-family: var(--font-display); font-weight: 700; text-transform: uppercase;
    letter-spacing: 1px; padding: 14px 20px; text-align: left; font-size: 11px;
}
.core-table td {
    padding: 14px 20px; border-bottom: 1px solid rgba(0,0,0,0.06);
    color: var(--text-dark); vertical-align: middle;
}
.core-table tr:last-child td { border-bottom: none; }
.core-table tr:hover td { background-color: rgba(255,200,0,0.05); }
.core-table-dl {
    display: inline-block; font-size: 11px; font-weight: 700; text-transform: uppercase;
    letter-spacing: 1px; background-color: var(--brand-black); color: var(--brand-yellow);
    padding: 7px 16px; transition: all 0.2s;
}
.core-table-dl:hover { background-color: var(--brand-yellow); color: var(--brand-black); }

/* ================= Responsive: Download Page ================= */
@media (max-width: 1200px) {
    .client-grid { grid-template-columns: 1fr; }
    .ios-app-grid { grid-template-columns: 1fr; }
}
@media (max-width: 1024px) {
    .dl-panel-header { flex-direction: column; }
    .dl-panel-info { min-width: unset; width: 100%; }
}

@media (max-width: 768px) {
    :root {
        /* Mobile: 20+20 padding + 44px hamburger row height; includes safe-area inset */
        --site-header-height: calc(84px + env(safe-area-inset-top, 0px));
    }

    body.nav-menu-open {
        overflow: hidden;
        touch-action: manipulation;
    }

    .nav-backdrop {
        display: block;
        position: fixed;
        left: 0; right: 0; bottom: 0;
        top: var(--site-header-height);
        z-index: 0;
        background: rgba(0, 0, 0, 0.48);
        opacity: 0;
        visibility: hidden;
        pointer-events: none;
        transition:
            opacity 0.4s cubic-bezier(0.16, 1, 0.3, 1),
            visibility 0s linear 0.4s;
    }
    .nav-backdrop.visible {
        opacity: 1;
        visibility: visible;
        pointer-events: auto;
        transition:
            opacity 0.4s cubic-bezier(0.16, 1, 0.3, 1),
            visibility 0s;
    }

    .top-nav { padding: 20px 5%; }
    .nav-menu {
        position: fixed; top: var(--site-header-height); left: 0; width: 100%;
        z-index: 1;
        background-color: rgba(17,17,17,0.98); flex-direction: column;
        padding: 28px 0 32px; gap: 6px;
        transform: translate3d(0, -100%, 0);
        opacity: 0;
        pointer-events: none;
        visibility: hidden;
        border-bottom: 2px solid var(--brand-yellow);
        box-shadow: 0 16px 48px rgba(0, 0, 0, 0.35);
        transition:
            transform 0.45s cubic-bezier(0.16, 1, 0.3, 1),
            opacity 0.38s cubic-bezier(0.16, 1, 0.3, 1),
            visibility 0s linear 0.45s;
    }
    .nav-menu.active {
        transform: translate3d(0, 0, 0);
        opacity: 1;
        pointer-events: auto;
        visibility: visible;
        transition:
            transform 0.45s cubic-bezier(0.16, 1, 0.3, 1),
            opacity 0.4s cubic-bezier(0.16, 1, 0.3, 1),
            visibility 0s;
    }

    .nav-menu > a,
    .nav-menu > .lang-switch {
        opacity: 0;
        transform: translate3d(0, 14px, 0);
        transition:
            opacity 0.38s cubic-bezier(0.16, 1, 0.3, 1),
            transform 0.42s cubic-bezier(0.16, 1, 0.3, 1);
    }
    .nav-menu:not(.active) > a,
    .nav-menu:not(.active) > .lang-switch {
        transition-delay: 0s !important;
        transition-duration: 0.2s;
    }
    .nav-menu.active > a:nth-child(1) { opacity: 1; transform: translate3d(0, 0, 0); transition-delay: 0.04s; }
    .nav-menu.active > a:nth-child(2) { opacity: 1; transform: translate3d(0, 0, 0); transition-delay: 0.07s; }
    .nav-menu.active > a:nth-child(3) { opacity: 1; transform: translate3d(0, 0, 0); transition-delay: 0.1s; }
    .nav-menu.active > a:nth-child(4) { opacity: 1; transform: translate3d(0, 0, 0); transition-delay: 0.13s; }
    .nav-menu.active > a:nth-child(5) { opacity: 1; transform: translate3d(0, 0, 0); transition-delay: 0.16s; }
    .nav-menu.active > a:nth-child(6) { opacity: 1; transform: translate3d(0, 0, 0); transition-delay: 0.19s; }
    .nav-menu.active > a:nth-child(7) { opacity: 1; transform: translate3d(0, 0, 0); transition-delay: 0.22s; }
    .nav-menu.active > .lang-switch { opacity: 1; transform: translate3d(0, 0, 0); transition-delay: 0.26s; }

    .nav-menu a {
        padding: 12px 8%;
    }

    .mobile-menu-btn { display: flex; }
    .lang-switch { border: none; padding-left: 0; }
    .lang-current { display: none; }
    .lang-dropdown,
    .lang-dropdown.open {
        display: flex; flex-direction: row; flex-wrap: wrap;
        position: static; background: none; border: none;
        padding: 0; gap: 6px 4px;
    }
    .lang-dropdown li { list-style: none; }
    .lang-dropdown li a {
        display: inline-block; padding: 5px 10px;
        font-size: 12px; border: 1px solid rgba(255,255,255,0.2);
        white-space: nowrap;
    }

    .mega-title { font-size: 14vw; white-space: nowrap; }
    .mega-subtitle { font-size: 4vw; }
    .mega-subtitle-cn { font-size: 12px; letter-spacing: 3px; }
    .hero-badges { display: none; }

    .stats-grid { grid-template-columns: repeat(2, 1fr); }
    .stat-item { border-bottom: 1px solid rgba(255,255,255,0.08); }
    .stat-item:nth-child(2) { border-right: none; }
    .stat-num { font-size: 38px; }

    .feature-panel, .download-panel { justify-content: center; padding: 0; }
    .content-block, .download-block { width: 100%; padding: 50px 20px; }

    .platform-grid { grid-template-columns: 1fr 1fr; gap: 12px; }
    .platform-section { padding: 80px 5%; }

    .typo-header { flex-direction: column; align-items: flex-start; gap: 20px; }
    .typo-header h2 { font-size: 40px; }
    .protocol-num { font-size: 50px; width: 70px; }

    .trust-grid { grid-template-columns: 1fr; gap: 40px; }
    .testimonial-grid { grid-template-columns: 1fr; }
    .blog-grid { grid-template-columns: 1fr; }

    .dl-grid { grid-template-columns: 1fr; }
    .cta-title { font-size: 34px; }
    .editorial-title { font-size: 36px; }
    .faq-q { font-size: 22px; }

    .footer-top { flex-direction: column; gap: 40px; }
    .f-links { flex-wrap: wrap; gap: 40px; }
    .footer-bottom { flex-direction: column; gap: 15px; text-align: center; }
    .section-header { flex-direction: column; align-items: flex-start; }

    /* Download page mobile overrides */
    .dl-page-hero { padding: 120px 5% 60px; }
    .dl-hero-title { font-size: clamp(40px, 12vw, 60px); }
    .dl-tab { padding: 16px 18px; font-size: 11px; gap: 5px; }
    .dl-panel-inner { padding: 50px 5%; }
    .client-card { padding: 24px 20px; }
    .client-name { font-size: 18px; }
    .client-gh-link, .client-gh-dead { margin-left: 0; }
    .ios-notice-box { padding: 20px; flex-direction: column; gap: 10px; }
    .ios-app-card { padding: 24px 20px; }
    .core-os-title { font-size: 16px; }
}