/* ================================================================
   XOKX.TOP · 陕西热朝信息技术 · 科技感重设计 v2
   ================================================================ */

:root {
    --cyan:   #00f2ff;
    --blue:   #4fc3f7;
    --purple: #8b5cf6;
    --gold:   #ffd700;
    --green:  #00ff88;
    --red:    #ff3366;

    --bg:     #010a14;
    --bg2:    #00040a;
    --bg3:    #011520;

    /* 文字颜色 — 确保在深色背景上清晰可读 */
    --text-primary:  #e8f4f8;   /* 主要文字，近白 */
    --text-body:     #b0cdd8;   /* 正文段落，蓝灰色 */
    --text-muted:    #6d9aaa;   /* 辅助说明，中等亮度 */
    --text-dim:      #4a7a8a;   /* 淡化元素，仍可见 */

    --glass-bg:     rgba(0, 200, 240, 0.04);
    --glass-border: rgba(0, 200, 240, 0.15);

    --font-main: 'Inter', sans-serif;
    --font-tech: 'Orbitron', sans-serif;
    --font-mono: 'Share Tech Mono', monospace;

    --radius: 8px;
    --section-gap: clamp(80px, 10vw, 140px);
}

/* ── Reset ── */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }

html {
    scroll-behavior: smooth;
    scroll-snap-type: y mandatory;
    font-size: 16px;
}

body {
    font-family: var(--font-main);
    background: var(--bg);
    color: var(--text-primary);
    overflow-x: hidden;
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

/* ================================================================
   BACKGROUND
   ================================================================ */

#bg-canvas {
    position: fixed;
    top: 0; left: 0;
    width: 100%; height: 100%;
    z-index: 0;
    pointer-events: none;
}

/* 全息透视网格 */
body::before {
    content: '';
    position: fixed; inset: 0;
    z-index: 1; pointer-events: none;
    background-image:
        linear-gradient(rgba(0, 242, 255, 0.035) 1px, transparent 1px),
        linear-gradient(90deg, rgba(0, 242, 255, 0.035) 1px, transparent 1px);
    background-size: 64px 64px;
    mask-image: radial-gradient(ellipse 90% 90% at 50% 40%, black 20%, transparent 90%);
}

.scanlines {
    position: fixed; inset: 0;
    z-index: 2; pointer-events: none;
    background: repeating-linear-gradient(
        0deg, transparent, transparent 3px,
        rgba(0, 0, 0, 0.025) 3px, rgba(0, 0, 0, 0.025) 4px
    );
}

/* ================================================================
   NAVIGATION
   ================================================================ */

.hud-nav {
    position: fixed;
    top: 0; left: 0; right: 0;
    z-index: 200;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 clamp(16px, 4%, 60px);
    height: 68px;
    background: rgba(1, 10, 20, 0.82);
    backdrop-filter: blur(24px);
    border-bottom: 1px solid rgba(0, 242, 255, 0.08);
    transition: background 0.4s, border-color 0.4s;
}

.hud-nav.scrolled {
    background: rgba(0, 4, 10, 0.96);
    border-bottom-color: rgba(0, 242, 255, 0.22);
    box-shadow: 0 4px 40px rgba(0, 0, 0, 0.5);
}

.nav-logo {
    font-family: var(--font-tech);
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--cyan);
    letter-spacing: 2px;
    display: flex; align-items: center; gap: 1px;
    text-shadow: 0 0 24px rgba(0, 242, 255, 0.55);
    flex-shrink: 0;
}

.logo-bracket { color: rgba(0, 242, 255, 0.45); }
.logo-domain  { color: rgba(0, 242, 255, 0.65); font-size: 0.88rem; }

.nav-links {
    display: flex; list-style: none;
    gap: 0; flex: 1;
    justify-content: center;
}

.nav-link {
    display: inline-flex; align-items: center; gap: 5px;
    padding: 8px 18px;
    text-decoration: none;
    color: var(--text-body);        /* ← 可读的蓝灰色 */
    font-family: var(--font-tech);
    font-size: 0.72rem;
    letter-spacing: 2px;
    text-transform: uppercase;
    position: relative;
    transition: color 0.3s;
}

.nav-link::before {
    content: attr(data-label) ' ·';
    font-size: 0.58rem;
    color: var(--cyan);
    opacity: 0.5;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0; left: 20%; right: 20%;
    height: 1px;
    background: var(--cyan);
    box-shadow: 0 0 8px var(--cyan);
    transform: scaleX(0);
    transition: transform 0.3s ease;
}

.nav-link:hover        { color: var(--cyan); }
.nav-link:hover::after { transform: scaleX(1); }

.nav-status {
    display: flex; align-items: center; gap: 8px;
    font-family: var(--font-mono);
    font-size: 0.68rem;
    color: var(--green);
    letter-spacing: 2px;
    flex-shrink: 0;
}

.status-dot {
    width: 6px; height: 6px;
    border-radius: 50%;
    background: var(--green);
    box-shadow: 0 0 10px var(--green);
    animation: pulse-dot 2s infinite;
}

@keyframes pulse-dot {
    0%, 100% { opacity: 1; transform: scale(1); }
    50%       { opacity: 0.4; transform: scale(0.7); }
}

/* 汉堡按钮 */
.nav-mobile-btn {
    display: none;
    flex-direction: column; gap: 5px;
    background: transparent; border: none;
    cursor: pointer; padding: 6px;
}

.nav-mobile-btn span {
    display: block; width: 24px; height: 2px;
    background: var(--cyan);
    border-radius: 2px;
    transition: all 0.3s;
}

/* 移动端下拉菜单 */
.mobile-menu {
    display: none;
    position: fixed;
    top: 68px; left: 0; right: 0;
    z-index: 199;
    background: rgba(0, 4, 10, 0.97);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid rgba(0, 242, 255, 0.15);
    flex-direction: column;
    padding: 12px 0;
    transform: translateY(-10px);
    opacity: 0;
    transition: all 0.3s ease;
}

.mobile-menu.open {
    display: flex;
    transform: translateY(0);
    opacity: 1;
}

.mobile-link {
    padding: 14px clamp(16px, 5%, 40px);
    text-decoration: none;
    color: var(--text-body);
    font-family: var(--font-tech);
    font-size: 0.85rem;
    letter-spacing: 2px;
    border-bottom: 1px solid rgba(0, 242, 255, 0.05);
    transition: color 0.3s, background 0.3s;
}

.mobile-link:hover {
    color: var(--cyan);
    background: rgba(0, 242, 255, 0.05);
}

/* ================================================================
   HERO
   ================================================================ */

.hero {
    position: relative;
    height: 100vh;
    min-height: 600px;
    display: flex;
    align-items: center;
    overflow: hidden;
    scroll-snap-align: start;
    padding: 68px clamp(20px, 5%, 80px) 0;
    z-index: 3;
}

#landmark-canvas {
    position: absolute;
    top: 0; right: 0;
    width: 52%;
    height: 100%;
    z-index: 4;
    pointer-events: none;
}

/* 位置卡片 */
.location-card {
    position: absolute;
    bottom: 56px; right: clamp(16px, 4%, 60px);
    z-index: 12;
    background: rgba(0, 8, 18, 0.88);
    backdrop-filter: blur(20px);
    border: 1px solid rgba(0, 242, 255, 0.22);
    border-left: 3px solid var(--cyan);
    border-radius: 4px;
    padding: 14px 22px;
    min-width: 280px;
    font-family: var(--font-mono);
    opacity: 0;
    transform: translateY(12px);
    transition: opacity 0.9s ease, transform 0.9s ease;
}

.location-card.visible { opacity: 1; transform: translateY(0); }

.loc-header {
    display: flex; align-items: center; gap: 8px;
    font-size: 0.62rem;
    color: var(--cyan);
    letter-spacing: 3px;
    margin-bottom: 8px;
    opacity: 0.75;
}

.loc-body {
    display: flex; align-items: center; gap: 10px;
    font-size: 0.95rem;
}

.loc-city     { color: var(--gold); font-weight: 700; }
.loc-sep      { color: var(--cyan); opacity: 0.5; }
.loc-landmark { color: var(--cyan); }
.loc-coords   { margin-top: 6px; font-size: 0.62rem; color: var(--text-muted); letter-spacing: 1px; }

/* Hero 主内容 */
.hero-content {
    position: relative; z-index: 10;
    max-width: min(600px, 48vw);
}

.hero-badge {
    display: inline-flex; align-items: center; gap: 10px;
    font-family: var(--font-mono);
    font-size: 0.68rem;
    color: var(--cyan);
    letter-spacing: 3px;
    text-transform: uppercase;
    margin-bottom: 1.8rem;
    padding: 7px 18px;
    border: 1px solid rgba(0, 242, 255, 0.28);
    border-radius: 3px;
    background: rgba(0, 242, 255, 0.05);
}

.badge-dot {
    width: 6px; height: 6px;
    border-radius: 50%;
    background: var(--cyan);
    box-shadow: 0 0 10px var(--cyan);
    animation: pulse-dot 1.5s infinite;
}

.hero-title {
    font-family: var(--font-tech);
    font-size: clamp(3.8rem, 10vw, 8.5rem);
    font-weight: 900;
    line-height: 1;
    letter-spacing: -2px;
    background: linear-gradient(145deg, #ffffff 0%, var(--cyan) 55%, var(--blue) 100%);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    margin-bottom: 0.6rem;
    filter: drop-shadow(0 0 30px rgba(0,242,255,0.25));
}

.hero-subtitle {
    font-family: var(--font-tech);
    font-size: clamp(1.4rem, 3.5vw, 2.8rem);
    font-weight: 400;
    color: var(--text-muted);       /* ← 可见的灰蓝色 */
    letter-spacing: 10px;
    margin-bottom: 1.4rem;
    text-transform: uppercase;
}

.hero-desc {
    font-family: var(--font-mono);
    font-size: clamp(0.82rem, 1.2vw, 0.98rem);
    color: var(--text-body);        /* ← 清晰的蓝灰色 */
    letter-spacing: 2px;
    margin-bottom: 2.8rem;
    line-height: 1.8;
}

/* 统计数字 */
.hero-stats {
    display: flex; align-items: center;
    gap: 0; flex-wrap: wrap;
    margin-bottom: 2.8rem;
}

.stat-item {
    display: flex; flex-direction: column;
    align-items: center;
    padding: 0 clamp(12px, 2vw, 28px);
}

.stat-item:first-child { padding-left: 0; }

.stat-top {
    display: flex; align-items: baseline; gap: 2px;
}

.stat-num {
    font-family: var(--font-tech);
    font-size: clamp(2rem, 4vw, 3.2rem);
    font-weight: 700;
    color: var(--cyan);
    text-shadow: 0 0 30px rgba(0, 242, 255, 0.5);
    line-height: 1;
}

.stat-unit {
    font-family: var(--font-tech);
    font-size: 1.2rem;
    color: var(--cyan);
    opacity: 0.8;
}

.stat-label {
    font-family: var(--font-mono);
    font-size: 0.7rem;
    color: var(--text-body);        /* ← 可见 */
    letter-spacing: 1px;
    margin-top: 5px;
    white-space: nowrap;
}

.stat-divider {
    width: 1px; height: 50px;
    background: linear-gradient(to bottom, transparent, rgba(0, 242, 255, 0.35), transparent);
}

/* CTA 按钮 */
.hero-actions {
    display: flex; gap: 16px; flex-wrap: wrap;
}

.cta-btn {
    display: inline-flex; align-items: center; gap: 10px;
    padding: 13px 32px;
    text-decoration: none;
    font-family: var(--font-tech);
    font-size: 0.82rem;
    letter-spacing: 2px;
    text-transform: uppercase;
    border-radius: 3px;
    transition: all 0.35s ease;
    position: relative; overflow: hidden;
}

.cta-primary {
    background: transparent;
    border: 1px solid var(--cyan);
    color: var(--cyan);
}

.cta-primary::before {
    content: '';
    position: absolute; inset: 0;
    background: var(--cyan);
    transform: translateX(-105%);
    transition: transform 0.35s ease;
    z-index: -1;
}

.cta-primary:hover { color: #000; box-shadow: 0 0 30px rgba(0,242,255,0.35); }
.cta-primary:hover::before { transform: translateX(0); }
.cta-primary:hover .btn-arrow { transform: translateX(6px); }

.cta-ghost {
    background: transparent;
    border: 1px solid rgba(255,255,255,0.2);
    color: var(--text-body);
}

.cta-ghost:hover {
    border-color: rgba(255,255,255,0.5);
    color: var(--text-primary);
    background: rgba(255,255,255,0.05);
}

.btn-arrow { transition: transform 0.3s ease; }

/* 滚动指示器 */
.scroll-indicator {
    position: absolute;
    bottom: 28px; left: clamp(20px, 5%, 80px);
    display: flex; flex-direction: column; align-items: center; gap: 8px;
    z-index: 10;
}

.scroll-line {
    width: 1px; height: 56px;
    background: linear-gradient(to bottom, transparent, var(--cyan));
    animation: scroll-grow 2s infinite;
}

.scroll-text {
    font-family: var(--font-mono);
    font-size: 0.58rem;
    color: var(--text-muted);
    letter-spacing: 4px;
    transform: rotate(90deg) translateX(20px);
    white-space: nowrap;
}

@keyframes scroll-grow {
    0%   { transform: scaleY(0); transform-origin: top; }
    50%  { transform: scaleY(1); transform-origin: top; }
    51%  { transform-origin: bottom; }
    100% { transform: scaleY(0); transform-origin: bottom; opacity: 0; }
}

/* ================================================================
   GLITCH
   ================================================================ */

.glitch { position: relative; }

.glitch::before, .glitch::after {
    content: attr(data-text);
    position: absolute; top: 0; left: 0;
    width: 100%; height: 100%;
    font-family: var(--font-tech);
    font-size: inherit; font-weight: inherit; letter-spacing: inherit;
    background: linear-gradient(145deg, #ffffff 0%, var(--cyan) 55%, var(--blue) 100%);
    -webkit-background-clip: text; background-clip: text;
    -webkit-text-fill-color: transparent;
}

.glitch::before {
    left: 3px;
    clip-path: polygon(0 18%, 100% 18%, 100% 34%, 0 34%);
    animation: gh-top 5s infinite;
    filter: hue-rotate(180deg) saturate(2.5);
}

.glitch::after {
    left: -3px;
    clip-path: polygon(0 62%, 100% 62%, 100% 78%, 0 78%);
    animation: gh-bot 5s infinite;
    filter: hue-rotate(-55deg) saturate(3);
}

@keyframes gh-top {
    0%,76%,80%,100% { transform:none; opacity:0; }
    77% { transform:translate(-4px,-2px); opacity:.85; }
    78% { transform:translate(4px, 2px); opacity:.85; }
    79% { transform:translate(2px,-1px); opacity:.85; }
}

@keyframes gh-bot {
    0%,81%,85%,100% { transform:none; opacity:0; }
    82% { transform:translate(3px, 2px); opacity:.85; }
    83% { transform:translate(-3px,-2px); opacity:.85; }
    84% { transform:translate(1px, 1px); opacity:.85; }
}

.glitch-sm { position:relative; display:inline-block; }
.glitch-sm::before, .glitch-sm::after {
    content: attr(data-text);
    position:absolute; top:0; left:0; color:var(--cyan);
}
.glitch-sm::before {
    left:1px; text-shadow:-1px 0 var(--red);
    clip-path:polygon(0 30%,100% 30%,100% 50%,0 50%);
    animation: gs 5s infinite;
}
.glitch-sm::after {
    left:-1px; text-shadow:1px 0 var(--blue);
    clip-path:polygon(0 60%,100% 60%,100% 76%,0 76%);
    animation: gs 5s infinite reverse;
}
@keyframes gs {
    0%,88%,100%{transform:none;opacity:0;}
    89%{transform:translateX(-2px);opacity:.7;}
    91%{transform:translateX(2px);opacity:.7;}
    93%{transform:none;opacity:0;}
}

/* ================================================================
   CONTENT SECTIONS
   ================================================================ */

.content-section {
    position: relative;
    z-index: 3;
    padding: clamp(80px, 10vh, 120px) clamp(20px, 5%, 80px);
    min-height: 100vh;
    display: flex; align-items: center;
    scroll-snap-align: start;
    overflow: hidden;
}

.content-section::before {
    content: '';
    position: absolute; inset: 0; z-index: -1; pointer-events: none;
    opacity: 0.04;
    background: radial-gradient(ellipse 55% 55% at 75% 50%, var(--cyan), transparent);
}

.content-section.alt::before {
    background: radial-gradient(ellipse 55% 55% at 25% 50%, var(--purple), transparent);
    opacity: 0.05;
}

.section-bg-label {
    position: absolute;
    top: clamp(80px, 12vh, 140px); right: clamp(20px, 5%, 80px);
    font-family: var(--font-tech);
    font-size: clamp(3rem, 7vw, 8rem);
    font-weight: 900;
    color: rgba(0, 242, 255, 0.03);
    letter-spacing: 4px;
    pointer-events: none;
    user-select: none;
    white-space: nowrap;
}

.container {
    width: 100%; max-width: 1560px; margin: 0 auto;
}

.content-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: clamp(24px, 4vw, 64px);
    align-items: center;
}

.content-grid.reverse { direction: rtl; }
.content-grid.reverse > * { direction: ltr; }

/* ── Glass HUD Card ── */
.glass {
    background: var(--glass-bg);
    backdrop-filter: blur(24px);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius);
    transition: border-color 0.4s, box-shadow 0.4s, background 0.4s;
}

.glass:hover {
    background: rgba(0, 200, 240, 0.06);
    border-color: rgba(0, 242, 255, 0.32);
    box-shadow: 0 0 50px rgba(0, 242, 255, 0.06), inset 0 0 30px rgba(0, 242, 255, 0.025);
}

.hud-card { position: relative; }

.card-corner {
    position: absolute;
    width: 18px; height: 18px;
    border-color: var(--hud-color, var(--cyan));
    border-style: solid;
    opacity: 0.55;
    transition: opacity 0.4s;
}

.hud-card:hover .card-corner { opacity: 1; }

.card-corner.tl { top: -1px; left: -1px;   border-width: 2px 0 0 2px; }
.card-corner.tr { top: -1px; right: -1px;  border-width: 2px 2px 0 0; }
.card-corner.bl { bottom: -1px; left: -1px;  border-width: 0 0 2px 2px; }
.card-corner.br { bottom: -1px; right: -1px; border-width: 0 2px 2px 0; }

/* 内容文字区 */
.content-text {
    padding: clamp(24px, 3vw, 52px);
    display: flex; flex-direction: column; justify-content: center;
    min-height: 480px;
}

.section-tag {
    font-family: var(--font-mono);
    font-size: 0.68rem;
    color: var(--cyan);
    letter-spacing: 3px;
    margin-bottom: 1.2rem;
    opacity: 0.8;
}

.section-title {
    font-family: var(--font-tech);
    font-size: clamp(2rem, 3.8vw, 3.4rem);
    font-weight: 700;
    margin-bottom: 1.5rem;
    background: linear-gradient(135deg, #ffffff 0%, var(--cyan) 100%);
    -webkit-background-clip: text; background-clip: text;
    -webkit-text-fill-color: transparent;
    line-height: 1.15;
}

.section-desc {
    font-size: clamp(0.92rem, 1.4vw, 1.08rem);
    color: var(--text-body);        /* ← 清晰可读 */
    line-height: 1.85;
    margin-bottom: 1.8rem;
}

/* Feature List */
.feature-list {
    display: flex; flex-direction: column; gap: 14px;
    margin-bottom: 2rem;
}

.feature-item {
    display: flex; align-items: flex-start; gap: 12px;
    padding: 12px 16px;
    background: rgba(0, 242, 255, 0.03);
    border-radius: 5px;
    border-left: 2px solid rgba(0, 242, 255, 0.25);
    transition: border-color 0.3s, background 0.3s;
}

.feature-item:hover {
    background: rgba(0, 242, 255, 0.07);
    border-left-color: var(--cyan);
}

.feature-item.feature-purple {
    background: rgba(139, 92, 246, 0.03);
    border-left-color: rgba(139, 92, 246, 0.25);
}

.feature-item.feature-purple:hover {
    background: rgba(139, 92, 246, 0.08);
    border-left-color: var(--purple);
}

.feature-item.feature-green {
    background: rgba(0, 255, 136, 0.03);
    border-left-color: rgba(0, 255, 136, 0.25);
}

.feature-item.feature-green:hover {
    background: rgba(0, 255, 136, 0.08);
    border-left-color: var(--green);
}

.feature-icon {
    color: var(--cyan);
    font-size: 0.9rem;
    margin-top: 2px;
    flex-shrink: 0;
}

.feature-item strong {
    display: block;
    font-size: 0.9rem;
    color: var(--text-primary);     /* ← 白色 */
    margin-bottom: 3px;
    font-weight: 600;
}

.feature-item span {
    font-size: 0.8rem;
    color: var(--text-body);        /* ← 蓝灰，清晰 */
    font-family: var(--font-mono);
    line-height: 1.5;
}

/* Tech Tags */
.tech-tags { display: flex; flex-wrap: wrap; gap: 10px; list-style: none; }

.tag {
    display: inline-flex; align-items: center; gap: 8px;
    padding: 7px 16px;
    background: rgba(0, 242, 255, 0.05);
    border: 1px solid rgba(0, 242, 255, 0.22);
    border-radius: 3px;
    font-size: 0.78rem;
    color: var(--cyan);
    font-family: var(--font-mono);
    letter-spacing: 1px;
    transition: all 0.3s ease;
    cursor: default;
}

.tag:hover {
    background: rgba(0, 242, 255, 0.12);
    border-color: var(--cyan);
    box-shadow: 0 0 14px rgba(0, 242, 255, 0.18);
    transform: translateY(-2px);
}

.tag-p {
    background: rgba(139, 92, 246, 0.06);
    border-color: rgba(139, 92, 246, 0.25);
    color: #c4b5fd;
}

.tag-p:hover {
    background: rgba(139, 92, 246, 0.14);
    border-color: var(--purple);
    box-shadow: 0 0 14px rgba(139, 92, 246, 0.22);
}

.tag-g {
    background: rgba(0, 255, 136, 0.05);
    border-color: rgba(0, 255, 136, 0.22);
    color: #6effc0;
}

.tag-g:hover {
    background: rgba(0, 255, 136, 0.12);
    border-color: var(--green);
    box-shadow: 0 0 14px rgba(0, 255, 136, 0.2);
}

.tag-dot { width: 5px; height: 5px; border-radius: 50%; background: var(--cyan); flex-shrink: 0; }

/* 可视化 Canvas */
.content-visual {
    height: clamp(360px, 45vh, 540px);
    display: flex; flex-direction: column;
    position: relative; overflow: hidden;
    border-radius: var(--radius);
}

.visual-label {
    position: absolute; top: 16px; left: 20px;
    font-family: var(--font-mono);
    font-size: 0.58rem; color: var(--cyan);
    letter-spacing: 3px; opacity: 0.55;
    z-index: 10;
}

.tech-canvas { width: 100%; height: 100%; display: block; }

/* ================================================================
   ABOUT SECTION
   ================================================================ */

.about-section {
    position: relative; z-index: 3;
    padding: clamp(80px, 10vh, 120px) clamp(20px, 5%, 80px);
    overflow: hidden;
}

.about-section::before {
    content: '';
    position: absolute; inset: 0; z-index: -1;
    background: radial-gradient(ellipse 70% 60% at 50% 50%, rgba(0, 242, 255, 0.02), transparent);
}

.about-header {
    text-align: center;
    margin-bottom: clamp(40px, 6vw, 80px);
}

.about-header .section-tag {
    display: flex; justify-content: center;
    margin-bottom: 1rem;
}

.about-title {
    font-family: var(--font-tech);
    font-size: clamp(2.4rem, 5vw, 4.5rem);
    font-weight: 700;
    background: linear-gradient(135deg, #fff 30%, var(--cyan) 100%);
    -webkit-background-clip: text; background-clip: text;
    -webkit-text-fill-color: transparent;
    margin-bottom: 1.5rem;
}

.about-intro {
    font-size: clamp(0.95rem, 1.5vw, 1.15rem);
    color: var(--text-body);
    line-height: 1.9;
    max-width: 700px; margin: 0 auto;
}

.about-intro strong {
    color: var(--cyan);
    -webkit-text-fill-color: var(--cyan);
    font-weight: 600;
}

.about-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: clamp(16px, 2.5vw, 32px);
}

.about-card {
    padding: clamp(24px, 3vw, 40px);
    text-align: center;
    border-radius: var(--radius);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.about-card:hover { transform: translateY(-6px); box-shadow: 0 12px 40px rgba(0,242,255,0.1); }

.about-card-icon {
    font-size: 2.5rem; margin-bottom: 1rem;
    display: block;
    filter: drop-shadow(0 0 10px rgba(0,242,255,0.3));
}

.about-card h3 {
    font-family: var(--font-tech);
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--cyan);
    margin-bottom: 0.9rem;
    letter-spacing: 2px;
}

.about-card p {
    font-size: 0.9rem;
    color: var(--text-body);        /* ← 可读 */
    line-height: 1.8;
}

/* ================================================================
   REVEAL ANIMATIONS
   ================================================================ */

.reveal {
    opacity: 0;
    transform: translateY(50px);
    transition: opacity 0.9s cubic-bezier(0.16, 1, 0.3, 1),
                transform 0.9s cubic-bezier(0.16, 1, 0.3, 1);
}

.reveal-delay { transition-delay: 0.18s; }

.reveal.visible {
    opacity: 1;
    transform: translateY(0);
}

/* ================================================================
   FOOTER
   ================================================================ */

.footer {
    position: relative; z-index: 3;
    padding: clamp(40px, 6vw, 70px) clamp(20px, 5%, 80px);
    border-top: 1px solid rgba(0, 242, 255, 0.1);
    background: rgba(0, 4, 10, 0.96);
    overflow: hidden;
}

.footer-grid-bg {
    position: absolute; inset: 0;
    opacity: 0.025;
    background-image:
        linear-gradient(rgba(0,242,255,1) 1px, transparent 1px),
        linear-gradient(90deg, rgba(0,242,255,1) 1px, transparent 1px);
    background-size: 28px 28px;
}

.footer-inner {
    position: relative;
    display: flex; flex-direction: column;
    align-items: center; gap: 14px;
}

.footer-logo {
    font-family: var(--font-tech);
    font-size: 1.2rem;
    color: rgba(0, 242, 255, 0.55);
    letter-spacing: 3px;
    display: flex; gap: 2px;
}

.footer-copy {
    color: var(--text-dim);
    font-size: 0.82rem;
    font-family: var(--font-mono);
    letter-spacing: 1px;
}

.beian a {
    display: inline-flex; align-items: center; gap: 6px;
    color: var(--text-dim);
    text-decoration: none;
    font-size: 0.82rem;
    font-family: var(--font-mono);
    letter-spacing: 1px;
    transition: color 0.3s;
}

.beian a:hover { color: var(--cyan); }
.beian-icon { font-size: 0.9rem; }

/* ================================================================
   RESPONSIVE
   ================================================================ */

@media (max-width: 1100px) {
    .nav-links { gap: 0; }
    .nav-link  { padding: 8px 12px; font-size: 0.68rem; }
    .nav-status { display: none; }

    .content-grid {
        grid-template-columns: 1fr;
        gap: clamp(20px, 3vw, 32px);
    }
    .content-grid.reverse { direction: ltr; }

    .content-section {
        min-height: auto;
        padding: clamp(100px, 12vh, 140px) clamp(20px, 5%, 40px) clamp(60px, 8vh, 80px);
        scroll-snap-align: none;
    }
    html { scroll-snap-type: none; }

    .content-text  { min-height: auto; }
    .content-visual { height: clamp(280px, 45vw, 400px); }

    #landmark-canvas {
        width: 100%; height: 50%;
        top: auto; bottom: 0;
        opacity: 0.45;
    }

    .hero-content { max-width: 100%; }

    .section-bg-label { font-size: clamp(2.5rem, 8vw, 5rem); }
}

@media (max-width: 768px) {
    .nav-links    { display: none; }
    .nav-mobile-btn { display: flex; }

    .hero {
        align-items: flex-end;
        padding-bottom: clamp(20px, 5vh, 40px);
    }

    .hero-content { max-width: 100%; }

    .hero-stats {
        gap: 0;
        flex-wrap: nowrap;
        overflow-x: auto;
    }

    .stat-item { padding: 0 12px; }

    .location-card {
        left: clamp(16px, 5%, 24px);
        right: clamp(16px, 5%, 24px);
        min-width: unset;
        bottom: clamp(100px, 14vh, 140px);
    }

    .about-cards { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 480px) {
    .hero-subtitle { letter-spacing: 5px; }
    .hero-actions  { flex-direction: column; align-items: flex-start; }
    .cta-btn       { width: 100%; justify-content: center; }
    .about-cards   { grid-template-columns: 1fr; }
    .hero-stats    { display: none; }
    .feature-list  { gap: 10px; }
}