/* ========================================
   朝宗音流 - Grok-inspired Premium Design
   ======================================== */

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

:root {
    --black: #000000;
    --bg: #0a0a0a;
    --surface: #111111;
    --border: rgba(255, 255, 255, 0.08);
    --text: #ffffff;
    --text-secondary: rgba(255, 255, 255, 0.5);
    --text-muted: rgba(255, 255, 255, 0.3);
    --accent: #8b5cf6;
    --accent-glow: rgba(139, 92, 246, 0.4);
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', 'Noto Sans SC', -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--black);
    color: var(--text);
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow-x: hidden;
}

/* ========================================
   背景
   ======================================== */
.bg {
    position: fixed;
    inset: 0;
    pointer-events: none;
    z-index: 0;
}

.bg-gradient {
    position: absolute;
    inset: 0;
    background: radial-gradient(ellipse 100% 100% at 50% -20%, rgba(139, 92, 246, 0.08) 0%, transparent 50%);
}

.bg-glow {
    position: absolute;
    border-radius: 50%;
    filter: blur(120px);
    opacity: 0.5;
}

.glow-1 {
    width: 800px;
    height: 800px;
    top: -400px;
    left: 50%;
    transform: translateX(-50%);
    background: radial-gradient(circle, rgba(139, 92, 246, 0.15) 0%, transparent 70%);
    animation: glow-breathe 8s ease-in-out infinite;
}

.glow-2 {
    width: 600px;
    height: 600px;
    bottom: -300px;
    right: -200px;
    background: radial-gradient(circle, rgba(59, 130, 246, 0.1) 0%, transparent 70%);
    animation: glow-breathe 10s ease-in-out infinite reverse;
}

@keyframes glow-breathe {
    0%, 100% { opacity: 0.4; transform: translateX(-50%) scale(1); }
    50% { opacity: 0.6; transform: translateX(-50%) scale(1.1); }
}

.bg-noise {
    position: absolute;
    inset: 0;
    opacity: 0.015;
    background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 512 512' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.7' numOctaves='4'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}

/* ========================================
   主内容
   ======================================== */
.main {
    position: relative;
    z-index: 1;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 0 24px;
}

/* ========================================
   Hero
   ======================================== */
.hero {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    padding: 120px 0 80px;
    max-width: 640px;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 8px 16px;
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--border);
    border-radius: 100px;
    font-size: 0.8rem;
    font-weight: 500;
    color: var(--text-secondary);
    letter-spacing: 0.02em;
    margin-bottom: 48px;
    backdrop-filter: blur(10px);
}

.badge-pulse {
    width: 6px;
    height: 6px;
    background: #22c55e;
    border-radius: 50%;
    box-shadow: 0 0 8px #22c55e;
    animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.4; }
}

.hero-title {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 20px;
    margin-bottom: 16px;
}

.title-icon {
    display: flex;
    align-items: center;
    justify-content: center;
}

.title-icon img {
    border-radius: 18px;
    box-shadow: 
        0 0 0 1px rgba(255, 255, 255, 0.1),
        0 20px 50px rgba(139, 92, 246, 0.3);
}

.title-text {
    font-size: clamp(2.5rem, 8vw, 4rem);
    font-weight: 700;
    letter-spacing: -0.03em;
    background: linear-gradient(180deg, #ffffff 0%, rgba(255, 255, 255, 0.7) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: clamp(1.5rem, 4vw, 2rem);
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: 24px;
    letter-spacing: -0.01em;
}

.hero-desc {
    font-size: 1.05rem;
    line-height: 1.8;
    color: var(--text-secondary);
    margin-bottom: 48px;
    max-width: 480px;
}

.hero-cta {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 16px;
}

.btn-primary {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 14px 28px;
    background: var(--text);
    color: var(--black);
    font-size: 0.95rem;
    font-weight: 600;
    border: none;
    border-radius: 12px;
    text-decoration: none;
    cursor: pointer;
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: 
        0 0 0 1px rgba(255, 255, 255, 0.1),
        0 4px 20px rgba(0, 0, 0, 0.4);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 
        0 0 0 1px rgba(255, 255, 255, 0.2),
        0 8px 30px rgba(0, 0, 0, 0.5),
        0 0 40px var(--accent-glow);
}

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

.btn-primary svg {
    opacity: 0.7;
}

.cta-meta {
    font-size: 0.8rem;
    color: var(--text-muted);
}

/* ========================================
   特性
   ======================================== */
.features {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1px;
    background: var(--border);
    border: 1px solid var(--border);
    border-radius: 16px;
    overflow: hidden;
    max-width: 900px;
    width: 100%;
    margin-bottom: 80px;
}

.feature {
    display: flex;
    align-items: flex-start;
    gap: 16px;
    padding: 28px 24px;
    background: var(--bg);
    transition: background 0.3s ease;
}

.feature:hover {
    background: var(--surface);
}

.feature-icon {
    flex-shrink: 0;
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--border);
    border-radius: 12px;
    color: var(--text-secondary);
}

.feature-content h3 {
    font-size: 0.95rem;
    font-weight: 600;
    margin-bottom: 4px;
    color: var(--text);
}

.feature-content p {
    font-size: 0.85rem;
    color: var(--text-muted);
    line-height: 1.5;
}

/* ========================================
   页脚
   ======================================== */
.footer {
    margin-top: auto;
    padding: 40px 0;
    text-align: center;
}

.footer p {
    font-size: 0.8rem;
    color: var(--text-muted);
}

/* ========================================
   动画
   ======================================== */
.hero > * {
    opacity: 0;
    transform: translateY(20px);
    animation: fade-up 0.8s cubic-bezier(0.4, 0, 0.2, 1) forwards;
}

.hero-badge { animation-delay: 0s; }
.hero-title { animation-delay: 0.1s; }
.hero-subtitle { animation-delay: 0.2s; }
.hero-desc { animation-delay: 0.3s; }
.hero-cta { animation-delay: 0.4s; }

.features {
    opacity: 0;
    transform: translateY(20px);
    animation: fade-up 0.8s cubic-bezier(0.4, 0, 0.2, 1) 0.5s forwards;
}

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

/* ========================================
   响应式
   ======================================== */
@media (max-width: 900px) {
    .features {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 600px) {
    .hero {
        padding: 80px 0 60px;
    }

    .hero-title {
        flex-direction: column;
        gap: 16px;
    }

    .title-icon img {
        width: 56px;
        height: 56px;
    }

    .features {
        grid-template-columns: 1fr;
    }

    .feature {
        padding: 24px 20px;
    }
}

/* ========================================
   减少动画
   ======================================== */
@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}