/* ==========================================
   CSS Variables & Themes
   ========================================== */
:root {
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    
    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    
    /* Border Radius */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-full: 50%;
    
    /* Transitions */
    --transition-fast: 0.15s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
}

/* Dark Theme (Default) */
[data-theme="dark"] {
    --bg-primary: #0a0a0b;
    --bg-secondary: #111113;
    --bg-card: #18181b;
    --bg-card-hover: #1f1f23;
    --bg-accent: #2563eb;
    --bg-accent-hover: #3b82f6;
    
    --text-primary: #fafafa;
    --text-secondary: #a1a1aa;
    --text-muted: #71717a;
    
    --border-color: #27272a;
    --border-accent: #3f3f46;
    
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.4);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.5);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.6);
    --shadow-glow: 0 0 40px rgba(37, 99, 235, 0.15);
}

/* Light Theme */
[data-theme="light"] {
    --bg-primary: #fafafa;
    --bg-secondary: #f4f4f5;
    --bg-card: #ffffff;
    --bg-card-hover: #f4f4f5;
    --bg-accent: #2563eb;
    --bg-accent-hover: #1d4ed8;
    
    --text-primary: #18181b;
    --text-secondary: #52525b;
    --text-muted: #a1a1aa;
    
    --border-color: #e4e4e7;
    --border-accent: #d4d4d8;
    
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.12);
    --shadow-glow: 0 0 40px rgba(37, 99, 235, 0.08);
}

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

html {
    font-size: 16px;
    scroll-behavior: smooth;
    color-scheme: dark light;
}

body {
    font-family: var(--font-family);
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    transition: background-color var(--transition-normal), color var(--transition-normal);
}

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

button {
    border: none;
    background: none;
    cursor: pointer;
    font-family: inherit;
}

/* ==========================================
   Controls (Theme & Language Toggle)
   ========================================== */
.controls {
    position: fixed;
    top: var(--spacing-lg);
    right: var(--spacing-lg);
    display: flex;
    gap: var(--spacing-sm);
    z-index: 100;
}

.control-btn {
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    font-size: 0.875rem;
    font-weight: 500;
    transition: all var(--transition-fast);
    backdrop-filter: blur(8px);
}

.control-btn:hover {
    background: var(--bg-card-hover);
    color: var(--text-primary);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.control-btn i {
    font-size: 1rem;
}

.lang-text {
    font-size: 0.75rem;
    font-weight: 600;
    letter-spacing: 0.5px;
}

/* ==========================================
   Container
   ========================================== */
.container {
    width: 100%;
    max-width: 480px;
    margin: 0 auto;
    padding: var(--spacing-xl) var(--spacing-md);
    padding-top: calc(var(--spacing-2xl) + 44px);
}

/* ==========================================
   Profile Section
   ========================================== */
.profile {
    text-align: center;
    margin-bottom: var(--spacing-xl);
}

.avatar {
    position: relative;
    width: 100px;
    height: 100px;
    margin: 0 auto;
    margin-bottom: var(--spacing-lg);
}

.avatar::before {
    content: '';
    position: absolute;
    inset: -3px;
    border-radius: var(--radius-full);
    background: linear-gradient(135deg, var(--bg-accent), #7c3aed);
    opacity: 0.3;
    z-index: 0;
    animation: pulse 3s ease-in-out infinite;
}

.avatar-img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: var(--radius-full);
    box-shadow: var(--shadow-glow);
    position: relative;
    z-index: 1;
    background-color: var(--bg-secondary);
}

@keyframes pulse {
    0%, 100% { transform: scale(1); opacity: 0.3; }
    50% { transform: scale(1.05); opacity: 0.5; }
}

.name {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: var(--spacing-xs);
    letter-spacing: -0.5px;
}

.title {
    font-size: 1rem;
    font-weight: 500;
    color: var(--bg-accent);
    margin-bottom: var(--spacing-sm);
}

.bio {
    font-size: 0.875rem;
    color: var(--text-secondary);
    max-width: 300px;
    margin: 0 auto;
}

/* ==========================================
   Links Section
   ========================================== */
.links-section {
    margin-bottom: var(--spacing-lg);
}

.section-title {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 1.5px;
    margin-bottom: var(--spacing-md);
    padding-left: var(--spacing-xs);
}

/* ==========================================
   Link Cards
   ========================================== */
.link-card {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-md) var(--spacing-lg);
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-sm);
    transition: all var(--transition-fast);
    position: relative;
    overflow: hidden;
    will-change: transform;
}

.link-card::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 3px;
    background: var(--bg-accent);
    transform: scaleY(0);
    transition: transform var(--transition-fast);
}

.link-card:hover {
    background: var(--bg-card-hover);
    transform: translateX(4px);
    box-shadow: var(--shadow-md);
}

.link-card:hover::before {
    transform: scaleY(1);
}

.link-card:active {
    transform: translateX(2px);
}

.link-icon {
    width: 42px;
    height: 42px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-secondary);
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
    font-size: 1.125rem;
    flex-shrink: 0;
    transition: all var(--transition-fast);
}

.link-card:hover .link-icon {
    background: var(--bg-accent);
    color: #fff;
}

.link-logo {
    width: 24px;
    height: 24px;
    object-fit: contain;
}

.link-content {
    flex: 1;
    min-width: 0;
}

.link-title {
    display: block;
    font-size: 0.9375rem;
    font-weight: 500;
    color: var(--text-primary);
    margin-bottom: 2px;
}

.link-subtitle {
    display: block;
    font-size: 0.8125rem;
    color: var(--text-muted);
}

.link-arrow {
    color: var(--text-muted);
    font-size: 0.875rem;
    transition: all var(--transition-fast);
    opacity: 0;
    transform: translateX(-8px);
}

.link-card:hover .link-arrow {
    opacity: 1;
    transform: translateX(0);
    color: var(--bg-accent);
}

/* Featured Card */
.link-card.featured {
    background: linear-gradient(135deg, var(--bg-accent), #7c3aed);
    border: none;
}

.link-card.featured .link-icon {
    background: rgba(255, 255, 255, 0.2);
    color: #fff;
}

.link-card.featured .link-title,
.link-card.featured .link-subtitle {
    color: #fff;
}

.link-card.featured .link-subtitle {
    opacity: 0.8;
}

.link-card.featured:hover {
    transform: translateX(4px) scale(1.01);
    box-shadow: 0 8px 32px rgba(37, 99, 235, 0.3);
}

.link-card.featured::before {
    display: none;
}

.link-card.featured .link-arrow {
    color: #fff;
}

/* Project Card */
.link-card.project-card .link-icon {
    background: linear-gradient(135deg, #FFC107, #FF5722);
    color: #fff;
}

.link-card.project-card:hover .link-icon {
    background: linear-gradient(135deg, #FF5722, #FFC107);
}

/* Platform Icons Colors on Hover */
.link-icon.youtube { color: var(--text-secondary); }
.link-card:hover .link-icon.youtube { background: #ff0000; color: #fff; }

.link-icon.tiktok { color: var(--text-secondary); }
.link-card:hover .link-icon.tiktok { background: #000; color: #fff; }

/* Email Card */
.email-wrapper {
    display: flex;
    gap: var(--spacing-xs);
    align-items: stretch;
}

.email-wrapper .email-card {
    flex: 1;
    margin-bottom: 0;
}

.copy-btn {
    width: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-card);
    border: 1px dashed var(--border-accent);
    border-radius: var(--radius-md);
    color: var(--text-muted);
    font-size: 1rem;
    cursor: pointer;
    transition: all var(--transition-fast);
    flex-shrink: 0;
}

.copy-btn:hover {
    background: var(--bg-accent);
    color: #fff;
    border-style: solid;
    border-color: var(--bg-accent);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.copy-btn:focus-visible {
    outline: 2px solid var(--bg-accent);
    outline-offset: 2px;
}

.email-card {
    border: 1px dashed var(--border-accent);
    background: transparent;
}

.email-card:hover {
    background: var(--bg-card);
    border-style: solid;
}

/* ==========================================
   Social Grid
   ========================================== */
.social-grid {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    gap: var(--spacing-sm);
}

.social-btn {
    aspect-ratio: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    font-size: 1.125rem;
    transition: all var(--transition-fast);
}

.social-btn:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-md);
}

.social-btn:focus-visible {
    outline: 2px solid var(--bg-accent);
    outline-offset: 2px;
}

/* Social Button Colors */
.social-btn:nth-child(1):hover { background: #000; color: #fff; border-color: #000; } /* TikTok */
.social-btn:nth-child(2):hover { background: #000; color: #fff; border-color: #000; } /* X */
.social-btn:nth-child(3):hover { background: #000; color: #fff; border-color: #000; } /* Threads */
.social-btn:nth-child(4):hover { background: #000; color: #fff; border-color: #000; } /* Medium */
.social-btn:nth-child(5):hover { background: #6364ff; color: #fff; border-color: #6364ff; } /* Mastodon */
.social-btn:nth-child(6):hover { background: #ff4500; color: #fff; border-color: #ff4500; } /* Reddit */
.social-btn:nth-child(7):hover { background: #35465c; color: #fff; border-color: #35465c; } /* Tumblr */

/* ==========================================
   Footer
   ========================================== */
.footer {
    text-align: center;
    padding: var(--spacing-xl) 0;
    margin-top: var(--spacing-lg);
}

.footer p {
    font-size: 0.75rem;
    color: var(--text-muted);
}

/* ==========================================
   Animations
   ========================================== */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.profile {
    animation: fadeInUp 0.6s ease forwards;
}

.links-section {
    animation: fadeInUp 0.6s ease forwards;
    opacity: 0;
}

.links-section:nth-child(2) { animation-delay: 0.1s; }
.links-section:nth-child(3) { animation-delay: 0.2s; }
.links-section:nth-child(4) { animation-delay: 0.3s; }
.links-section:nth-child(5) { animation-delay: 0.4s; }
.links-section:nth-child(6) { animation-delay: 0.5s; }
.links-section:nth-child(7) { animation-delay: 0.6s; }

/* ==========================================
   Responsive Adjustments
   ========================================== */
@media (max-width: 380px) {
    .social-grid {
        grid-template-columns: repeat(4, 1fr);
    }
    
    .name {
        font-size: 1.5rem;
    }
}

@media (min-width: 481px) {
    .container {
        padding: var(--spacing-2xl) var(--spacing-lg);
        padding-top: calc(var(--spacing-2xl) + 60px);
    }
    
    .link-card {
        padding: var(--spacing-lg) var(--spacing-xl);
    }
    
    .link-icon {
        width: 48px;
        height: 48px;
        font-size: 1.25rem;
    }
    
    .avatar {
        width: 120px;
        height: 120px;
    }
    
    .name {
        font-size: 2rem;
    }
}

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

/* ==========================================
   Selection
   ========================================== */
::selection {
    background: var(--bg-accent);
    color: #fff;
}

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

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

::-webkit-scrollbar-thumb {
    background: var(--border-accent);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--text-muted);
}

/* ==========================================
   Toast Notification
   ========================================== */
.toast-container {
    position: fixed;
    bottom: var(--spacing-xl);
    left: 50%;
    transform: translateX(-50%);
    z-index: 1000;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-sm);
    pointer-events: none;
}

.toast {
    background: var(--bg-card);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    padding: var(--spacing-sm) var(--spacing-lg);
    border-radius: var(--radius-md);
    font-size: 0.8125rem;
    font-family: var(--font-family);
    box-shadow: var(--shadow-lg);
    animation: toastIn 0.3s ease forwards, toastOut 0.3s ease 2s forwards;
    backdrop-filter: blur(12px);
}

@keyframes toastIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

@keyframes toastOut {
    from { opacity: 1; transform: translateY(0); }
    to { opacity: 0; transform: translateY(-10px); }
}

/* ==========================================
   Focus Visible
   ========================================== */
.link-card:focus-visible,
.control-btn:focus-visible {
    outline: 2px solid var(--bg-accent);
    outline-offset: 2px;
}