/* 驱动精灵 全新设计 - 深空科技主题 */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800;900&display=swap');

:root {
    --primary: #6366f1;
    --primary-light: #818cf8;
    --primary-dark: #4f46e5;
    --accent: #06b6d4;
    --accent-light: #22d3ee;
    --success: #10b981;
    --warning: #f59e0b;
    --bg-deep: #050816;
    --bg-dark: #0a0e27;
    --bg-card: rgba(99, 102, 241, 0.06);
    --bg-card-hover: rgba(99, 102, 241, 0.12);
    --bg-glass: rgba(255, 255, 255, 0.03);
    --bg-glass-strong: rgba(255, 255, 255, 0.06);
    --text-primary: #f1f5f9;
    --text-secondary: rgba(241, 245, 249, 0.55);
    --text-tertiary: rgba(241, 245, 249, 0.35);
    --border-subtle: rgba(99, 102, 241, 0.12);
    --border-medium: rgba(99, 102, 241, 0.25);
    --glow-primary: rgba(99, 102, 241, 0.35);
    --glow-accent: rgba(6, 182, 212, 0.35);
    --radius-sm: 8px;
    --radius-md: 14px;
    --radius-lg: 20px;
    --radius-xl: 28px;
    --radius-full: 9999px;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', 'Microsoft YaHei', 'PingFang SC', sans-serif;
    min-height: 100vh;
    color: var(--text-primary);
    background: var(--bg-deep);
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
}

::selection {
    background: var(--primary);
    color: white;
}

/* ========== Animated Background ========== */
.bg-effects {
    position: fixed;
    inset: 0;
    pointer-events: none;
    z-index: 0;
    overflow: hidden;
}

.orb {
    position: absolute;
    border-radius: 50%;
    filter: blur(100px);
    opacity: 0.4;
}

.orb-1 {
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, var(--primary) 0%, transparent 70%);
    top: -200px;
    right: -150px;
    animation: orb-drift 25s ease-in-out infinite;
}

.orb-2 {
    width: 500px;
    height: 500px;
    background: radial-gradient(circle, var(--accent) 0%, transparent 70%);
    bottom: -150px;
    left: -150px;
    animation: orb-drift 30s ease-in-out infinite reverse;
}

.orb-3 {
    width: 350px;
    height: 350px;
    background: radial-gradient(circle, var(--primary-light) 0%, transparent 70%);
    top: 45%;
    left: 50%;
    transform: translate(-50%, -50%);
    animation: orb-drift 20s ease-in-out infinite;
    animation-delay: -8s;
}

@keyframes orb-drift {
    0%, 100% { transform: translate(0, 0) scale(1); }
    25% { transform: translate(40px, -40px) scale(1.08); }
    50% { transform: translate(-30px, 30px) scale(0.94); }
    75% { transform: translate(25px, 35px) scale(1.04); }
}

.grid-overlay {
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(90deg, transparent 49.5%, rgba(99, 102, 241, 0.025) 49.5%, rgba(99, 102, 241, 0.025) 50.5%, transparent 50.5%),
        linear-gradient(0deg, transparent 49.5%, rgba(99, 102, 241, 0.025) 49.5%, rgba(99, 102, 241, 0.025) 50.5%, transparent 50.5%);
    background-size: 100px 100px;
}

/* Noise texture overlay */
.noise-overlay {
    position: absolute;
    inset: 0;
    opacity: 0.015;
    background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}

/* ========== Navigation ========== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    padding: 0;
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

.navbar.scrolled {
    background: rgba(5, 8, 22, 0.85);
    backdrop-filter: blur(24px) saturate(180%);
    border-bottom: 1px solid var(--border-subtle);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 18px 32px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
    text-decoration: none;
    color: var(--text-primary);
}

.logo-icon {
    width: 38px;
    height: 38px;
    border-radius: 10px;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
    box-shadow: 0 4px 20px var(--glow-primary);
}

.logo-text {
    font-size: 18px;
    font-weight: 700;
    letter-spacing: -0.02em;
    background: linear-gradient(135deg, var(--text-primary), var(--text-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav-links {
    display: flex;
    gap: 4px;
    background: var(--bg-glass-strong);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-full);
    padding: 4px;
}

.nav-links a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 14px;
    font-weight: 500;
    padding: 8px 20px;
    border-radius: var(--radius-full);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.nav-links a:hover {
    color: var(--text-primary);
}

.nav-links a.active {
    color: white;
    background: var(--primary);
    box-shadow: 0 2px 12px var(--glow-primary);
}

/* ========== Hero Section ========== */
.hero-section {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 120px 32px 80px;
    position: relative;
    z-index: 1;
}

.hero-content {
    text-align: center;
    max-width: 800px;
    animation: fade-up 1s cubic-bezier(0.4, 0, 0.2, 1);
}

@keyframes fade-up {
    from { opacity: 0; transform: translateY(30px); }
    to { opacity: 1; transform: translateY(0); }
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 20px;
    background: var(--bg-card);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-full);
    font-size: 13px;
    color: var(--primary-light);
    font-weight: 500;
    margin-bottom: 32px;
    animation: fade-up 1s cubic-bezier(0.4, 0, 0.2, 1);
    animation-delay: 0.1s;
    animation-fill-mode: both;
}

.badge-dot {
    width: 8px;
    height: 8px;
    background: var(--success);
    border-radius: 50%;
    animation: blink 2s ease-in-out infinite;
}

@keyframes blink {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.3; }
}

.hero-visual {
    position: relative;
    width: 120px;
    height: 120px;
    margin: 0 auto 40px;
    animation: fade-up 1s cubic-bezier(0.4, 0, 0.2, 1);
    animation-delay: 0.2s;
    animation-fill-mode: both;
}

.hero-icon-container {
    width: 120px;
    height: 120px;
    border-radius: 32px;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 56px;
    box-shadow: 0 20px 60px var(--glow-primary), 0 0 120px var(--glow-accent);
    position: relative;
    z-index: 2;
    animation: icon-breathe 4s ease-in-out infinite;
}

@keyframes icon-breathe {
    0%, 100% { transform: scale(1); box-shadow: 0 20px 60px var(--glow-primary), 0 0 120px var(--glow-accent); }
    50% { transform: scale(1.04); box-shadow: 0 24px 80px var(--glow-primary), 0 0 160px var(--glow-accent); }
}

.hero-ring {
    position: absolute;
    inset: -15px;
    border: 1.5px solid var(--border-medium);
    border-radius: 40px;
    animation: ring-expand 3s ease-out infinite;
    opacity: 0;
}

.hero-ring:nth-child(2) {
    animation-delay: 1s;
}

.hero-ring:nth-child(3) {
    animation-delay: 2s;
}

@keyframes ring-expand {
    0% { inset: -15px; opacity: 0.6; }
    100% { inset: -60px; opacity: 0; }
}

.hero-title {
    font-size: 72px;
    font-weight: 900;
    letter-spacing: -0.04em;
    line-height: 1.05;
    margin-bottom: 16px;
    animation: fade-up 1s cubic-bezier(0.4, 0, 0.2, 1);
    animation-delay: 0.3s;
    animation-fill-mode: both;
}

.hero-title-gradient {
    background: linear-gradient(135deg, var(--text-primary) 0%, var(--primary-light) 50%, var(--accent-light) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 20px;
    color: var(--text-secondary);
    font-weight: 400;
    line-height: 1.6;
    margin-bottom: 48px;
    animation: fade-up 1s cubic-bezier(0.4, 0, 0.2, 1);
    animation-delay: 0.4s;
    animation-fill-mode: both;
}

.hero-subtitle strong {
    color: var(--primary-light);
    font-weight: 600;
}

.hero-actions {
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
    animation: fade-up 1s cubic-bezier(0.4, 0, 0.2, 1);
    animation-delay: 0.5s;
    animation-fill-mode: both;
}

/* ========== Buttons ========== */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 14px 32px;
    border-radius: var(--radius-full);
    font-size: 15px;
    font-weight: 600;
    text-decoration: none;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    cursor: pointer;
    border: none;
    font-family: inherit;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    color: white;
    box-shadow: 0 4px 20px var(--glow-primary);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 32px var(--glow-primary);
    filter: brightness(1.1);
}

.btn-primary:active {
    transform: translateY(0);
}

.btn-secondary {
    background: var(--bg-glass-strong);
    color: var(--text-primary);
    border: 1px solid var(--border-medium);
}

.btn-secondary:hover {
    background: var(--bg-card-hover);
    border-color: var(--primary);
    transform: translateY(-2px);
}

.btn-icon {
    width: 18px;
    height: 18px;
}

/* ========== Stats Section ========== */
.stats-section {
    padding: 0 32px 80px;
    position: relative;
    z-index: 1;
}

.stats-grid {
    max-width: 1000px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
}

.stat-card {
    background: var(--bg-glass);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-lg);
    padding: 28px 20px;
    text-align: center;
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    overflow: hidden;
}

.stat-card::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, var(--bg-card), transparent);
    opacity: 0;
    transition: opacity 0.4s;
}

.stat-card:hover {
    transform: translateY(-4px);
    border-color: var(--border-medium);
    box-shadow: 0 16px 48px rgba(99, 102, 241, 0.12);
}

.stat-card:hover::before {
    opacity: 1;
}

.stat-card > * {
    position: relative;
    z-index: 1;
}

.stat-icon-wrapper {
    width: 48px;
    height: 48px;
    margin: 0 auto 16px;
    border-radius: 14px;
    background: var(--bg-card);
    border: 1px solid var(--border-subtle);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 22px;
    transition: all 0.3s;
}

.stat-card:hover .stat-icon-wrapper {
    background: var(--primary);
    border-color: var(--primary);
    box-shadow: 0 4px 16px var(--glow-primary);
}

.stat-value {
    font-size: 36px;
    font-weight: 800;
    letter-spacing: -0.03em;
    background: linear-gradient(135deg, var(--primary-light), var(--accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    display: inline;
}

.stat-unit {
    font-size: 16px;
    color: var(--primary-light);
    font-weight: 600;
}

.stat-label {
    color: var(--text-secondary);
    font-size: 13px;
    font-weight: 500;
    margin-top: 6px;
}

/* ========== Features Section ========== */
.features-section {
    padding: 100px 32px;
    position: relative;
    z-index: 1;
}

.section-header {
    text-align: center;
    max-width: 600px;
    margin: 0 auto 60px;
}

.section-tag {
    display: inline-block;
    padding: 6px 16px;
    background: var(--bg-card);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-full);
    font-size: 12px;
    font-weight: 600;
    color: var(--primary-light);
    text-transform: uppercase;
    letter-spacing: 0.08em;
    margin-bottom: 16px;
}

.section-title {
    font-size: 40px;
    font-weight: 800;
    letter-spacing: -0.03em;
    line-height: 1.15;
    margin-bottom: 16px;
    color: var(--text-primary);
}

.section-desc {
    font-size: 16px;
    color: var(--text-secondary);
    line-height: 1.7;
}

.features-grid {
    max-width: 1200px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
}

.feature-card {
    background: var(--bg-glass);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-lg);
    padding: 32px 24px;
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    overflow: hidden;
}

.feature-card::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: linear-gradient(90deg, var(--primary), var(--accent));
    opacity: 0;
    transition: opacity 0.4s;
}

.feature-card:hover {
    transform: translateY(-6px);
    border-color: var(--border-medium);
    box-shadow: 0 20px 60px rgba(99, 102, 241, 0.1);
    background: var(--bg-glass-strong);
}

.feature-card:hover::after {
    opacity: 1;
}

.feature-icon-wrapper {
    width: 52px;
    height: 52px;
    border-radius: 14px;
    background: linear-gradient(135deg, var(--bg-card), var(--bg-glass-strong));
    border: 1px solid var(--border-subtle);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    margin-bottom: 20px;
    transition: all 0.3s;
}

.feature-card:hover .feature-icon-wrapper {
    background: linear-gradient(135deg, var(--primary), var(--accent));
    border-color: transparent;
    box-shadow: 0 8px 24px var(--glow-primary);
}

.feature-card h3 {
    font-size: 17px;
    font-weight: 700;
    margin-bottom: 10px;
    color: var(--text-primary);
    letter-spacing: -0.01em;
}

.feature-card p {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.7;
}

/* ========== How It Works Section ========== */
.howto-section {
    padding: 100px 32px;
    position: relative;
    z-index: 1;
}

.howto-steps {
    max-width: 900px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 32px;
    position: relative;
}

.howto-steps::before {
    content: '';
    position: absolute;
    top: 40px;
    left: 16.67%;
    right: 16.67%;
    height: 2px;
    background: linear-gradient(90deg, var(--primary), var(--accent), var(--primary));
    opacity: 0.2;
}

.step-card {
    text-align: center;
    position: relative;
}

.step-number {
    width: 56px;
    height: 56px;
    margin: 0 auto 20px;
    border-radius: 50%;
    background: var(--bg-deep);
    border: 2px solid var(--border-medium);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
    font-weight: 800;
    color: var(--primary-light);
    position: relative;
    z-index: 2;
    transition: all 0.3s;
}

.step-card:hover .step-number {
    background: var(--primary);
    border-color: var(--primary);
    color: white;
    box-shadow: 0 8px 24px var(--glow-primary);
}

.step-card h3 {
    font-size: 17px;
    font-weight: 700;
    margin-bottom: 8px;
    color: var(--text-primary);
}

.step-card p {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.6;
}

/* ========== CTA Section ========== */
.cta-section {
    padding: 80px 32px;
    position: relative;
    z-index: 1;
}

.cta-card {
    max-width: 800px;
    margin: 0 auto;
    padding: 64px 48px;
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.1), rgba(6, 182, 212, 0.08));
    border: 1px solid var(--border-medium);
    border-radius: var(--radius-xl);
    text-align: center;
    position: relative;
    overflow: hidden;
}

.cta-card::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, var(--glow-primary) 0%, transparent 50%);
    opacity: 0.15;
    animation: cta-glow 8s ease-in-out infinite;
}

@keyframes cta-glow {
    0%, 100% { transform: translate(0, 0); }
    50% { transform: translate(10%, 10%); }
}

.cta-card > * {
    position: relative;
    z-index: 1;
}

.cta-title {
    font-size: 36px;
    font-weight: 800;
    letter-spacing: -0.03em;
    margin-bottom: 16px;
}

.cta-desc {
    font-size: 16px;
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: 32px;
}

/* ========== Footer ========== */
.footer {
    padding: 48px 32px;
    position: relative;
    z-index: 1;
    border-top: 1px solid var(--border-subtle);
}

.footer-content {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.footer-left {
    display: flex;
    align-items: center;
    gap: 8px;
    color: var(--text-secondary);
    font-size: 14px;
}

.footer-divider {
    color: var(--text-tertiary);
}

.footer-right {
    color: var(--text-tertiary);
    font-size: 13px;
}

/* ========== Download Page ========== */
.download-section {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 120px 32px 60px;
    position: relative;
    z-index: 1;
}

.download-container {
    max-width: 560px;
    width: 100%;
    animation: fade-up 0.8s cubic-bezier(0.4, 0, 0.2, 1);
}

.download-card {
    background: var(--bg-glass-strong);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-xl);
    padding: 48px;
    position: relative;
    overflow: hidden;
}

.download-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--primary), var(--accent));
}

.app-info {
    display: flex;
    align-items: center;
    gap: 24px;
    margin-bottom: 32px;
}

.app-icon {
    width: 80px;
    height: 80px;
    border-radius: 22px;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 42px;
    flex-shrink: 0;
    box-shadow: 0 8px 32px var(--glow-primary);
    position: relative;
}

.app-icon-glow {
    position: absolute;
    inset: -8px;
    border-radius: 28px;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    opacity: 0.3;
    filter: blur(16px);
    animation: pulse-glow 3s ease-in-out infinite;
}

@keyframes pulse-glow {
    0%, 100% { transform: scale(1); opacity: 0.3; }
    50% { transform: scale(1.1); opacity: 0.5; }
}

.app-details h1 {
    font-size: 28px;
    font-weight: 800;
    letter-spacing: -0.02em;
    margin-bottom: 4px;
}

.app-desc {
    color: var(--text-secondary);
    font-size: 14px;
}

.app-version {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 12px;
    padding: 20px;
    background: rgba(0, 0, 0, 0.25);
    border-radius: var(--radius-md);
    margin-bottom: 28px;
    border: 1px solid var(--border-subtle);
}

.version-item {
    text-align: center;
}

.version-label {
    display: block;
    color: var(--text-tertiary);
    font-size: 11px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    margin-bottom: 4px;
}

.version-value {
    color: var(--primary-light);
    font-weight: 700;
    font-size: 15px;
}

.download-specs {
    margin-bottom: 24px;
}

.download-specs h3 {
    font-size: 12px;
    color: var(--text-tertiary);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    margin-bottom: 12px;
}

.specs-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 10px;
}

.spec-item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 12px 16px;
    background: rgba(0, 0, 0, 0.2);
    border-radius: var(--radius-sm);
    border: 1px solid var(--border-subtle);
    transition: all 0.3s;
}

.spec-item:hover {
    background: var(--bg-card);
    border-color: var(--border-medium);
}

.spec-icon {
    font-size: 18px;
}

.spec-name {
    font-size: 14px;
    font-weight: 500;
}

.spec-version {
    font-size: 11px;
    color: var(--text-tertiary);
    margin-left: auto;
}

.download-features {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-bottom: 28px;
}

.feature-tag {
    padding: 6px 14px;
    background: var(--bg-card);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-full);
    font-size: 12px;
    font-weight: 500;
    color: var(--primary-light);
}

.download-btn-primary {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    width: 100%;
    padding: 18px;
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    color: white;
    border-radius: var(--radius-md);
    font-size: 16px;
    font-weight: 700;
    text-decoration: none;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: 0 8px 32px var(--glow-primary);
    font-family: inherit;
    letter-spacing: -0.01em;
}

.download-btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 12px 40px var(--glow-primary);
    filter: brightness(1.1);
}

.download-icon {
    width: 20px;
    height: 20px;
}

.download-links {
    display: flex;
    justify-content: center;
    gap: 24px;
    margin-top: 20px;
}

.link-item {
    display: flex;
    align-items: center;
    gap: 6px;
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 13px;
    font-weight: 500;
    transition: color 0.3s;
}

.link-item:hover {
    color: var(--primary-light);
}

.back-home {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    margin-top: 28px;
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 14px;
    font-weight: 500;
    transition: color 0.3s;
}

.back-home:hover {
    color: var(--primary-light);
}

.back-home svg {
    width: 16px;
    height: 16px;
}

/* ========== 404 Page ========== */
.error-section {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 120px 32px 60px;
    position: relative;
    z-index: 1;
}

.error-content {
    text-align: center;
    max-width: 560px;
    animation: fade-up 0.8s cubic-bezier(0.4, 0, 0.2, 1);
}

.error-code {
    font-size: 120px;
    font-weight: 900;
    letter-spacing: -0.05em;
    line-height: 1;
    margin-bottom: 24px;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    opacity: 0.6;
    user-select: none;
}

.error-title {
    font-size: 28px;
    font-weight: 700;
    margin-bottom: 12px;
    letter-spacing: -0.02em;
}

.error-message {
    color: var(--text-secondary);
    font-size: 16px;
    line-height: 1.7;
    margin-bottom: 40px;
}

.error-actions {
    display: flex;
    gap: 12px;
    justify-content: center;
    flex-wrap: wrap;
}

/* ========== Scroll Animations ========== */
.animate-on-scroll {
    opacity: 0;
    transform: translateY(24px);
    transition: all 0.7s cubic-bezier(0.4, 0, 0.2, 1);
}

.animate-on-scroll.visible {
    opacity: 1;
    transform: translateY(0);
}

/* ========== Responsive ========== */
@media (max-width: 768px) {
    .hero-title { font-size: 48px; }
    .hero-subtitle { font-size: 17px; }
    .hero-icon-container { width: 96px; height: 96px; font-size: 44px; border-radius: 26px; }
    .hero-visual { width: 96px; height: 96px; }

    .stats-grid { grid-template-columns: repeat(2, 1fr); }
    .features-grid { grid-template-columns: repeat(2, 1fr); }
    .howto-steps { grid-template-columns: 1fr; gap: 24px; }
    .howto-steps::before { display: none; }

    .section-title { font-size: 32px; }
    .cta-title { font-size: 28px; }
    .cta-card { padding: 40px 28px; }

    .download-card { padding: 36px 24px; }
    .app-info { flex-direction: column; text-align: center; }
    .specs-grid { grid-template-columns: 1fr; }
    .download-links { flex-direction: column; gap: 10px; }
    .footer-content { flex-direction: column; gap: 12px; text-align: center; }
}

@media (max-width: 480px) {
    .hero-section { padding: 100px 20px 60px; }
    .hero-title { font-size: 38px; }
    .hero-subtitle { font-size: 15px; }
    .hero-actions { flex-direction: column; align-items: center; }

    .stats-grid { grid-template-columns: 1fr 1fr; gap: 12px; }
    .stat-value { font-size: 28px; }
    .stat-card { padding: 20px 16px; }

    .features-grid { grid-template-columns: 1fr; }
    .features-section { padding: 60px 20px; }
    .section-title { font-size: 28px; }

    .nav-container { padding: 14px 20px; }

    .error-code { font-size: 80px; }
    .error-actions { flex-direction: column; align-items: center; }
}