/* ========================================
   Anya & Master - Landing Page Styles
   Theme: Dark Tech + Pink/Purple Accent
   ======================================== */

/* CSS Variables */
:root {
    --bg-primary: #0a0a1a;
    --bg-secondary: #111128;
    --bg-card: rgba(20, 20, 45, 0.8);
    --text-primary: #e8e8f0;
    --text-secondary: #8888aa;
    --accent-pink: #ff6b9d;
    --accent-cute: #ff9ecd;
    --accent-purple: #c44dff;
    --accent-blue: #4dabf7;
    --accent-green: #69db7c;
    --accent-yellow: #ffd43b;
    --glow-pink: rgba(255, 107, 157, 0.4);
    --glow-purple: rgba(196, 77, 255, 0.4);
    --border-color: rgba(255, 255, 255, 0.08);
    --card-border: rgba(255, 255, 255, 0.06);
    --font-main: 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', sans-serif;
    --font-mono: 'Cascadia Code', 'Fira Code', 'Consolas', monospace;
}

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

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

body {
    font-family: var(--font-main);
    background: var(--bg-primary);
    color: var(--text-primary);
    overflow-x: hidden;
    line-height: 1.6;
    min-height: 100vh;
}

a {
    text-decoration: none;
    color: inherit;
}

/* ========== Particle Canvas ========== */
#particles {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 0;
    pointer-events: none;
}

/* ========== Navbar ========== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 2rem;
    background: rgba(10, 10, 26, 0.85);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-color);
    transition: all 0.3s ease;
}

.navbar.scrolled {
    background: rgba(10, 10, 26, 0.95);
    box-shadow: 0 4px 30px rgba(0, 0, 0, 0.3);
}

.nav-brand {
    font-size: 1.3rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--accent-pink), var(--accent-purple));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    letter-spacing: 0.5px;
}

.nav-links {
    display: flex;
    gap: 2rem;
}

.nav-links a {
    color: var(--text-secondary);
    font-size: 0.95rem;
    transition: color 0.3s ease;
}

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

/* ========== Hero Section ========== */
.hero {
    position: relative;
    z-index: 1;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 2rem;
}

.hero-content {
    max-width: 700px;
}

.avatar-ring {
    width: 120px;
    height: 120px;
    margin: 0 auto 2rem;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--accent-pink), var(--accent-purple), var(--accent-blue));
    padding: 4px;
    animation: ring-glow 3s ease-in-out infinite;
    display: flex;
    align-items: center;
    justify-content: center;
}

@keyframes ring-glow {
    0%, 100% { box-shadow: 0 0 20px var(--glow-pink), 0 0 40px var(--glow-purple); }
    50% { box-shadow: 0 0 30px var(--glow-pink), 0 0 60px var(--glow-purple), 0 0 80px var(--glow-purple); }
}

.avatar {
    width: 100%;
    height: 100%;
    border-radius: 50%;
    background: var(--bg-secondary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 3.5rem;
    animation: bounce-subtle 2s ease-in-out infinite;
}

@keyframes bounce-subtle {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-5px); }
}

.typewriter {
    font-size: clamp(2rem, 5vw, 3.5rem);
    font-weight: 800;
    line-height: 1.2;
    margin-bottom: 1rem;
    background: linear-gradient(135deg, #fff 0%, var(--accent-pink) 50%, var(--accent-purple) 100%);
    background-size: 200% auto;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    animation: gradient-shift 4s linear infinite;
    min-height: 1.2em;
}

@keyframes gradient-shift {
    0% { background-position: 0% center; }
    100% { background-position: 200% center; }
}

.hero-subtitle {
    font-size: 1.15rem;
    color: var(--text-secondary);
    margin-bottom: 2.5rem;
    min-height: 1.5em;
}

.hero-stats {
    display: flex;
    justify-content: center;
    gap: 3rem;
    margin-top: 1rem;
}

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

.stat-number {
    display: block;
    font-size: 2rem;
    font-weight: 800;
    background: linear-gradient(135deg, var(--accent-pink), var(--accent-purple));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.stat-label {
    font-size: 0.85rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 1px;
}

.scroll-hint {
    position: absolute;
    bottom: 2rem;
    left: 50%;
    transform: translateX(-50%);
    color: var(--text-secondary);
    font-size: 0.9rem;
    animation: float 2s ease-in-out infinite;
}

@keyframes float {
    0%, 100% { transform: translateX(-50%) translateY(0); opacity: 0.6; }
    50% { transform: translateX(-50%) translateY(-10px); opacity: 1; }
}

/* ========== Section Title ========== */
.section-title {
    text-align: center;
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 3rem;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1rem;
}

.title-decoration {
    width: 40px;
    height: 3px;
    background: linear-gradient(90deg, var(--accent-pink), var(--accent-purple));
    border-radius: 2px;
}

/* ========== Module Cards ========== */
.modules {
    position: relative;
    z-index: 1;
    padding: 4rem 2rem;
    max-width: 1200px;
    margin: 0 auto;
}

.module-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
    gap: 1.5rem;
}

.module-card {
    position: relative;
    background: var(--bg-card);
    border: 1px solid var(--card-border);
    border-radius: 16px;
    padding: 2rem;
    transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    overflow: hidden;
    cursor: pointer;
    display: block;
}

.module-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--card-accent, var(--accent-pink)), var(--accent-purple));
    opacity: 0;
    transition: opacity 0.3s ease;
}

.module-card:hover {
    transform: translateY(-8px) scale(1.02);
    border-color: var(--card-accent, var(--accent-pink));
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.4),
                0 0 30px var(--card-glow, var(--glow-pink));
}

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

.card-bg-glow {
    position: absolute;
    top: -50%;
    right: -50%;
    width: 100%;
    height: 100%;
    background: radial-gradient(circle, var(--card-glow, var(--glow-pink)) 0%, transparent 70%);
    opacity: 0;
    transition: opacity 0.4s ease;
    pointer-events: none;
}

.module-card:hover .card-bg-glow {
    opacity: 1;
}

/* Card accent colors */
.module-card[data-color="#ff6b9d"] { --card-accent: #ff6b9d; --card-glow: var(--glow-pink); }
.module-card[data-color="#c44dff"] { --card-accent: #c44dff; --card-glow: var(--glow-purple); }
.module-card[data-color="#4dabf7"] { --card-accent: #4dabf7; --card-glow: rgba(77, 171, 247, 0.4); }
.module-card[data-color="#69db7c"] { --card-accent: #69db7c; --card-glow: rgba(105, 219, 124, 0.4); }
.module-card[data-color="#ffd43b"] { --card-accent: #ffd43b; --card-glow: rgba(255, 212, 59, 0.4); }

.card-icon {
    font-size: 2.5rem;
    margin-bottom: 1rem;
    display: inline-block;
    transition: transform 0.3s ease;
}

.module-card:hover .card-icon {
    transform: scale(1.2) rotate(5deg);
}

.module-card h3 {
    font-size: 1.35rem;
    font-weight: 700;
    margin-bottom: 0.75rem;
    color: var(--text-primary);
}

.module-card p {
    color: var(--text-secondary);
    font-size: 0.92rem;
    line-height: 1.6;
    margin-bottom: 1.25rem;
}

.card-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: 1rem;
}

.card-tags span {
    padding: 0.25rem 0.75rem;
    background: rgba(255, 255, 255, 0.06);
    border: 1px solid var(--border-color);
    border-radius: 20px;
    font-size: 0.78rem;
    color: var(--text-secondary);
    transition: all 0.3s ease;
}

.module-card:hover .card-tags span {
    border-color: var(--card-accent, var(--accent-pink));
    color: var(--text-primary);
    background: rgba(255, 255, 255, 0.08);
}

.card-arrow {
    position: absolute;
    right: 1.5rem;
    bottom: 1.5rem;
    font-size: 1.5rem;
    color: var(--card-accent, var(--accent-pink));
    opacity: 0;
    transform: translateX(-10px);
    transition: all 0.3s ease;
}

.module-card:hover .card-arrow {
    opacity: 1;
    transform: translateX(0);
}

.placeholder-card {
    cursor: default;
    opacity: 0.5;
}

.placeholder-card:hover {
    transform: none;
    border-color: var(--border-color);
    box-shadow: none;
}

/* ========== About Section ========== */
.about-section {
    position: relative;
    z-index: 1;
    padding: 4rem 2rem;
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
}

.about-text p {
    font-size: 1.1rem;
    color: var(--text-secondary);
    margin-bottom: 0.75rem;
    line-height: 1.8;
}

.about-text strong {
    color: var(--accent-pink);
}

.about-text code {
    background: rgba(255, 158, 205, 0.15);
    padding: 0.15rem 0.5rem;
    border-radius: 4px;
    font-family: var(--font-mono);
    color: var(--accent-cute);
    font-size: 0.95em;
}

.tech-stack {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 0.75rem;
    margin-top: 2rem;
}

.tech-tag {
    padding: 0.5rem 1.2rem;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    font-size: 0.85rem;
    color: var(--text-secondary);
    transition: all 0.3s ease;
}

.tech-tag:hover {
    border-color: var(--accent-purple);
    color: var(--text-primary);
    background: rgba(196, 77, 255, 0.1);
}

/* ========== Footer ========== */
footer {
    position: relative;
    z-index: 1;
    text-align: center;
    padding: 2rem;
    border-top: 1px solid var(--border-color);
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.footer-sub {
    margin-top: 0.5rem;
    font-size: 0.8rem;
    opacity: 0.6;
}

.footer-beian {
    margin-top: 0.5rem;
    font-size: 0.75rem;
    opacity: 0.5;
}

.footer-beian a {
    color: inherit;
    text-decoration: none;
    transition: opacity 0.3s ease;
}

.footer-beian a:hover {
    opacity: 0.8;
    text-decoration: underline;
}

/* ========== Responsive ========== */
@media (max-width: 768px) {
    .navbar {
        padding: 0.8rem 1rem;
    }

    .nav-brand {
        font-size: 1.1rem;
    }

    .hero-stats {
        gap: 1.5rem;
    }

    .stat-number {
        font-size: 1.5rem;
    }

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

    .section-title {
        font-size: 1.5rem;
        gap: 0.5rem;
    }

    .title-decoration {
        width: 24px;
    }

    .modules {
        padding: 2rem 1rem;
    }
}

@media (max-width: 480px) {
    .avatar-ring {
        width: 90px;
        height: 90px;
    }

    .avatar {
        font-size: 2.5rem;
    }

    .typewriter {
        font-size: 1.6rem;
    }

    .hero-subtitle {
        font-size: 1rem;
    }

    .hero-stats {
        flex-direction: column;
        gap: 1rem;
    }
}

/* ========== Scrollbar ========== */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: var(--bg-primary);
}

::-webkit-scrollbar-thumb {
    background: linear-gradient(var(--accent-pink), var(--accent-purple));
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--accent-purple);
}

/* ========== Selection ========== */
::selection {
    background: var(--accent-pink);
    color: white;
}