/**
 * Critical Region - Modern Gaming UI Stylesheet
 * Premium gaming interface with cyberpunk aesthetics
 */

/* ===================================
   CSS VARIABLES & ROOT SETTINGS
   =================================== */
:root {
    /* Color Palette */
    --primary-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --secondary-gradient: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
    --success-gradient: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
    --accent-gradient: linear-gradient(135deg, #fa709a 0%, #fee140 100%);

    --bg-dark: #0a0e27;
    --bg-darker: #050811;
    --bg-card: rgba(15, 20, 40, 0.85);
    --bg-card-hover: rgba(20, 25, 50, 0.95);

    --primary: #667eea;
    --primary-light: #8b9ffc;
    --primary-dark: #5568d3;
    --secondary: #764ba2;
    --accent: #f5576c;
    --success: #00f2fe;
    --warning: #fee140;
    --error: #ff4757;

    --text-primary: #ffffff;
    --text-secondary: #a0aec0;
    --text-muted: #718096;

    /* Shadows & Effects */
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.5);
    --shadow-xl: 0 12px 40px rgba(0, 0, 0, 0.6);
    --glow-primary: 0 0 20px rgba(102, 126, 234, 0.4);
    --glow-success: 0 0 20px rgba(0, 242, 254, 0.4);
    --glow-error: 0 0 20px rgba(255, 71, 87, 0.4);

    /* 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: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    --radius-full: 9999px;

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 250ms ease;
    --transition-slow: 350ms ease;

    /* Typography */
    --font-display: 'Orbitron', sans-serif;
    --font-body: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
}

/* ===================================
   GLOBAL STYLES & RESET
   =================================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

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

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

/* ===================================
   ANIMATED BACKGROUND
   =================================== */
.background-animation {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    overflow: hidden;
    background: linear-gradient(to bottom, var(--bg-darker) 0%, var(--bg-dark) 50%, #0f1729 100%);
}

.grid-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image:
        linear-gradient(rgba(102, 126, 234, 0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(102, 126, 234, 0.03) 1px, transparent 1px);
    background-size: 50px 50px;
    animation: gridMove 20s linear infinite;
}

@keyframes gridMove {
    0% { transform: translateY(0); }
    100% { transform: translateY(50px); }
}

.glow-orb {
    position: absolute;
    border-radius: 50%;
    filter: blur(80px);
    opacity: 0.3;
    animation: float 20s ease-in-out infinite;
}

.orb-1 {
    width: 400px;
    height: 400px;
    background: radial-gradient(circle, rgba(102, 126, 234, 0.4) 0%, transparent 70%);
    top: -200px;
    left: -200px;
    animation-delay: 0s;
}

.orb-2 {
    width: 500px;
    height: 500px;
    background: radial-gradient(circle, rgba(118, 75, 162, 0.3) 0%, transparent 70%);
    top: 50%;
    right: -250px;
    animation-delay: -7s;
}

.orb-3 {
    width: 450px;
    height: 450px;
    background: radial-gradient(circle, rgba(245, 87, 108, 0.2) 0%, transparent 70%);
    bottom: -200px;
    left: 30%;
    animation-delay: -14s;
}

@keyframes float {
    0%, 100% { transform: translate(0, 0) scale(1); }
    25% { transform: translate(50px, -50px) scale(1.1); }
    50% { transform: translate(-30px, 30px) scale(0.9); }
    75% { transform: translate(30px, 50px) scale(1.05); }
}

/* ===================================
   LAYOUT COMPONENTS
   =================================== */
.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 var(--spacing-xl);
}

/* ===================================
   NAVIGATION BAR
   =================================== */
.navbar {
    background: rgba(10, 14, 39, 0.8);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid rgba(102, 126, 234, 0.2);
    padding: var(--spacing-md) 0;
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-family: var(--font-display);
    font-weight: 900;
    font-size: 1.5rem;
    letter-spacing: 2px;
}

.logo-icon {
    font-size: 2rem;
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { transform: scale(1); opacity: 1; }
    50% { transform: scale(1.1); opacity: 0.8; }
}

.logo-text {
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
}

.nav-status {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    background: rgba(102, 126, 234, 0.1);
    border: 1px solid rgba(102, 126, 234, 0.3);
    border-radius: var(--radius-full);
    font-size: 0.875rem;
    font-weight: 600;
}

.status-dot {
    width: 8px;
    height: 8px;
    background: var(--success);
    border-radius: 50%;
    box-shadow: 0 0 10px var(--success);
    animation: statusBlink 2s ease-in-out infinite;
}

@keyframes statusBlink {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

/* Friends Dropdown */
.friends-dropdown {
    position: relative;
}

.friends-toggle {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    background: rgba(102, 126, 234, 0.1);
    border: 1px solid rgba(102, 126, 234, 0.3);
    border-radius: var(--radius-full);
    font-family: var(--font-body);
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-primary);
    cursor: pointer;
    transition: all 0.3s ease;
}

.friends-toggle:hover {
    background: rgba(102, 126, 234, 0.2);
    border-color: rgba(102, 126, 234, 0.5);
    transform: translateY(-1px);
}

.friends-icon {
    font-size: 1rem;
}

.friends-label {
    margin-right: var(--spacing-xs);
}

.friends-count {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 20px;
    height: 20px;
    padding: 0 6px;
    background: var(--primary-gradient);
    border-radius: var(--radius-full);
    font-size: 0.75rem;
    font-weight: 700;
}

.friends-dropdown-menu {
    position: absolute;
    top: calc(100% + 10px);
    right: 0;
    width: 320px;
    max-height: 500px;
    overflow-y: auto;
    overflow-x: hidden;
    background: rgba(10, 14, 39, 0.98);
    border: 1px solid rgba(102, 126, 234, 0.3);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    backdrop-filter: blur(10px);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: all 0.3s ease;
    z-index: 1000;
}

.friends-dropdown-menu.open {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.friends-dropdown-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-md);
    border-bottom: 1px solid rgba(102, 126, 234, 0.2);
}

.friends-dropdown-title {
    font-family: var(--font-display);
    font-size: 1rem;
    font-weight: 700;
    color: var(--text-primary);
    margin: 0;
}

.friends-dropdown-menu .friends-list,
.friends-dropdown-menu .friend-requests {
    padding: var(--spacing-sm);
}

.friends-dropdown-menu .add-friend-form {
    padding: var(--spacing-md);
    border-bottom: 1px solid rgba(102, 126, 234, 0.2);
}

.friends-dropdown-menu .empty-state {
    padding: var(--spacing-lg);
    text-align: center;
    color: var(--text-secondary);
    font-size: 0.875rem;
}

/* ===================================
   HERO SECTION
   =================================== */
.hero-section {
    min-height: calc(100vh - 80px);
    display: flex;
    align-items: center;
    padding: var(--spacing-2xl) 0;
}

.hero-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-2xl);
    align-items: center;
}

.hero-text {
    animation: fadeInLeft 0.8s ease-out;
}

@keyframes fadeInLeft {
    from {
        opacity: 0;
        transform: translateX(-30px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

.hero-title {
    font-family: var(--font-display);
    font-size: 5rem;
    font-weight: 900;
    line-height: 1;
    margin-bottom: var(--spacing-md);
    letter-spacing: -2px;
}

.gradient-text {
    display: block;
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    animation: gradientShift 3s ease infinite;
    background-size: 200% 200%;
}

.gradient-text-alt {
    display: block;
    background: var(--secondary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    animation: gradientShift 3s ease infinite;
    background-size: 200% 200%;
    animation-delay: 0.5s;
}

@keyframes gradientShift {
    0%, 100% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
}

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xl);
    font-weight: 400;
}

.hero-features {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-md);
}

.feature-badge {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    background: rgba(102, 126, 234, 0.1);
    border: 1px solid rgba(102, 126, 234, 0.3);
    border-radius: var(--radius-full);
    font-size: 0.875rem;
    font-weight: 600;
    transition: all var(--transition-base);
}

.feature-badge:hover {
    background: rgba(102, 126, 234, 0.2);
    border-color: var(--primary);
    transform: translateY(-2px);
}

.badge-icon {
    font-size: 1.25rem;
}

/* ===================================
   AUTH CARDS
   =================================== */
.auth-container {
    animation: fadeInRight 0.8s ease-out;
}

@keyframes fadeInRight {
    from {
        opacity: 0;
        transform: translateX(30px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

.auth-card {
    background: var(--bg-card);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(102, 126, 234, 0.2);
    border-radius: var(--radius-xl);
    padding: var(--spacing-2xl);
    box-shadow: var(--shadow-xl);
    transition: all var(--transition-base);
}

.auth-card:hover {
    border-color: rgba(102, 126, 234, 0.4);
    box-shadow: var(--shadow-xl), var(--glow-primary);
}

.card-header {
    text-align: center;
    margin-bottom: var(--spacing-xl);
}

.card-title {
    font-family: var(--font-display);
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.card-subtitle {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

/* ===================================
   FORMS
   =================================== */
.auth-form {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.form-label {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-weight: 600;
    font-size: 0.875rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 1px;
}

.label-icon {
    font-size: 1.1rem;
}

.form-input {
    width: 100%;
    padding: var(--spacing-md) var(--spacing-lg);
    background: rgba(10, 14, 39, 0.6);
    border: 2px solid rgba(102, 126, 234, 0.2);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-size: 1rem;
    font-family: var(--font-body);
    transition: all var(--transition-base);
}

.form-input::placeholder {
    color: var(--text-muted);
}

.form-input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
    background: rgba(10, 14, 39, 0.8);
}

.form-hint {
    font-size: 0.75rem;
    color: var(--text-muted);
    margin-top: -4px;
}

.form-footer {
    text-align: center;
    padding-top: var(--spacing-md);
}

.form-toggle-text {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

.form-link {
    color: var(--primary);
    text-decoration: none;
    font-weight: 600;
    transition: color var(--transition-fast);
}

.form-link:hover {
    color: var(--primary-light);
    text-decoration: underline;
}

/* ===================================
   BUTTONS
   =================================== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md) var(--spacing-xl);
    border: none;
    border-radius: var(--radius-md);
    font-family: var(--font-body);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-base);
    position: relative;
    overflow: hidden;
}

.btn::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.2);
    transform: translate(-50%, -50%);
    transition: width 0.6s, height 0.6s;
}

.btn:hover::before {
    width: 300px;
    height: 300px;
}

.btn-primary {
    background: var(--primary-gradient);
    color: white;
    box-shadow: var(--shadow-md);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg), var(--glow-primary);
}

.btn-secondary {
    background: rgba(102, 126, 234, 0.1);
    color: var(--primary);
    border: 2px solid var(--primary);
}

.btn-secondary:hover {
    background: rgba(102, 126, 234, 0.2);
    transform: translateY(-2px);
}

.btn-large {
    padding: var(--spacing-lg) var(--spacing-2xl);
    font-size: 1.1rem;
    width: 100%;
}

.btn-icon-only {
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none !important;
}

.btn-text {
    position: relative;
    z-index: 1;
}

.btn-icon {
    position: relative;
    z-index: 1;
    font-size: 1.2rem;
    transition: transform var(--transition-base);
}

.btn:hover .btn-icon {
    transform: translateX(4px);
}

/* ===================================
   ERROR & SUCCESS MESSAGES
   =================================== */
.error-message {
    padding: var(--spacing-md);
    background: rgba(255, 71, 87, 0.1);
    border: 1px solid var(--error);
    border-radius: var(--radius-md);
    color: var(--error);
    font-size: 0.875rem;
    animation: shake 0.5s ease;
}

@keyframes shake {
    0%, 100% { transform: translateX(0); }
    25% { transform: translateX(-10px); }
    75% { transform: translateX(10px); }
}

.success-message {
    padding: var(--spacing-md);
    background: rgba(0, 242, 254, 0.1);
    border: 1px solid var(--success);
    border-radius: var(--radius-md);
    color: var(--success);
    font-size: 0.875rem;
}

/* ===================================
   GAME SECTION
   =================================== */
.game-section {
    padding: var(--spacing-2xl) 0;
    animation: fadeIn 0.8s ease-out;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

.game-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-xl);
    padding: var(--spacing-lg);
    background: var(--bg-card);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(102, 126, 234, 0.2);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-md);
}

.player-info {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.player-avatar {
    width: 60px;
    height: 60px;
    background: var(--primary-gradient);
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    box-shadow: var(--shadow-md);
}

.player-details {
    display: flex;
    flex-direction: column;
}

.player-name {
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 700;
    margin: 0;
}

.player-rank {
    color: var(--text-secondary);
    font-size: 0.875rem;
}

.game-stats {
    display: flex;
    gap: var(--spacing-lg);
}

.stat-card {
    padding: var(--spacing-md) var(--spacing-lg);
    background: rgba(10, 14, 39, 0.6);
    border: 1px solid rgba(102, 126, 234, 0.2);
    border-radius: var(--radius-lg);
    text-align: center;
    min-width: 100px;
    transition: all var(--transition-base);
}

.stat-card:hover {
    border-color: var(--primary);
    transform: translateY(-2px);
}

.stat-primary {
    background: var(--primary-gradient);
    border: none;
}

.stat-label {
    font-size: 0.75rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 1px;
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
}

.stat-primary .stat-label {
    color: rgba(255, 255, 255, 0.9);
}

.stat-value {
    font-family: var(--font-display);
    font-size: 2rem;
    font-weight: 700;
    color: var(--text-primary);
}

/* ===================================
   GAME AREA
   =================================== */
.game-area {
    display: grid;
    grid-template-columns: 1fr 350px;
    gap: var(--spacing-xl);
}

/* Main game container with canvas and next piece side-by-side */
.game-main {
    display: flex;
    gap: var(--spacing-lg);
    align-items: flex-start;
}

.game-canvas-wrapper {
    position: relative;
    flex: 1;
    background: var(--bg-card);
    border: 2px solid rgba(102, 126, 234, 0.3);
    border-radius: var(--radius-xl);
    padding: var(--spacing-xl);
    box-shadow: var(--shadow-xl);
    display: flex;
    align-items: center;
    justify-content: center;
}

#game-canvas {
    display: block;
    border-radius: var(--radius-md);
    box-shadow: var(--glow-primary);
}

/* Next/Hold Piece Container - Integrated with game */
.next-piece-container {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
    min-width: 140px;
}

.next-piece-title {
    font-family: var(--font-display);
    font-size: 0.875rem;
    font-weight: 700;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 1px;
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

.next-piece-title .title-icon {
    font-size: 1rem;
}

.hold-title {
    margin-top: var(--spacing-md);
}

.next-piece-display {
    background: var(--bg-card);
    border: 2px solid rgba(102, 126, 234, 0.2);
    border-radius: var(--radius-lg);
    padding: var(--spacing-md);
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 140px;
    box-shadow: var(--shadow-md);
    transition: all var(--transition-base);
}

.next-piece-display:hover {
    border-color: var(--primary);
    box-shadow: var(--glow-primary);
}

#next-piece-canvas,
#hold-piece-canvas {
    display: block;
    border-radius: var(--radius-sm);
}

.canvas-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(10, 14, 39, 0.95);
    backdrop-filter: blur(10px);
    border-radius: var(--radius-xl);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 10;
}

.overlay-content {
    text-align: center;
}

.overlay-title {
    font-family: var(--font-display);
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: var(--spacing-xl);
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* ===================================
   GAME SIDEBAR
   =================================== */
.game-sidebar {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.sidebar-card {
    background: var(--bg-card);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(102, 126, 234, 0.2);
    border-radius: var(--radius-xl);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-md);
}

.sidebar-title {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-family: var(--font-display);
    font-size: 1.1rem;
    font-weight: 700;
    margin-bottom: var(--spacing-md);
    color: var(--primary-light);
}

.title-icon {
    font-size: 1.3rem;
}

/* Controls */
.controls-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-sm);
}

.control-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm);
    background: rgba(10, 14, 39, 0.6);
    border-radius: var(--radius-md);
    font-size: 0.875rem;
}

kbd {
    padding: var(--spacing-xs) var(--spacing-sm);
    background: var(--primary-gradient);
    border-radius: var(--radius-sm);
    font-family: var(--font-display);
    font-size: 0.75rem;
    font-weight: 700;
    color: white;
    box-shadow: var(--shadow-sm);
    min-width: 28px;
    text-align: center;
}

/* Stats */
.stats-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.stat-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-sm) var(--spacing-md);
    background: rgba(10, 14, 39, 0.6);
    border-radius: var(--radius-md);
}

.stat-name {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.stat-number {
    font-family: var(--font-display);
    font-weight: 700;
    color: var(--primary-light);
}

/* Friends Panel */
.sidebar-title {
    position: relative;
}

.btn-icon-small {
    width: 32px;
    height: 32px;
    padding: 0;
    background: var(--primary-gradient);
    border: none;
    border-radius: var(--radius-md);
    color: white;
    font-size: 1.5rem;
    font-weight: 700;
    cursor: pointer;
    transition: all var(--transition-base);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.btn-icon-small:hover {
    transform: scale(1.1);
    box-shadow: var(--glow-primary);
}

.btn-icon-small.hidden {
    display: none;
}

.add-friend-form {
    padding: var(--spacing-md);
    background: rgba(10, 14, 39, 0.6);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-md);
}

.form-input-small {
    width: 100%;
    padding: var(--spacing-sm) var(--spacing-md);
    background: rgba(10, 14, 39, 0.8);
    border: 2px solid rgba(102, 126, 234, 0.2);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    font-size: 0.875rem;
    margin-bottom: var(--spacing-sm);
    transition: all var(--transition-base);
}

.form-input-small:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 2px rgba(102, 126, 234, 0.1);
}

.form-actions {
    display: flex;
    gap: var(--spacing-sm);
}

.btn-small {
    flex: 1;
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: 0.875rem;
}

.friends-list {
    max-height: 300px;
    overflow-y: auto;
    scrollbar-width: thin;
    scrollbar-color: var(--primary) rgba(10, 14, 39, 0.6);
}

.friends-list::-webkit-scrollbar {
    width: 6px;
}

.friends-list::-webkit-scrollbar-track {
    background: rgba(10, 14, 39, 0.6);
    border-radius: var(--radius-sm);
}

.friends-list::-webkit-scrollbar-thumb {
    background: var(--primary);
    border-radius: var(--radius-sm);
}

.friend-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-sm) var(--spacing-md);
    background: rgba(10, 14, 39, 0.6);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-sm);
    transition: all var(--transition-base);
}

.friend-item:hover {
    background: rgba(102, 126, 234, 0.1);
    transform: translateX(2px);
}

.friend-info {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.friend-avatar {
    width: 32px;
    height: 32px;
    background: var(--primary-gradient);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1rem;
    position: relative;
    flex-shrink: 0;
}

.friend-avatar.online {
    box-shadow: 0 0 0 2px rgba(34, 197, 94, 0.3);
}

.online-indicator {
    position: absolute;
    bottom: -2px;
    right: -2px;
    width: 10px;
    height: 10px;
    background: var(--success);
    border: 2px solid var(--bg-dark);
    border-radius: 50%;
    box-shadow: 0 0 8px var(--success);
    animation: pulse-online 2s ease-in-out infinite;
}

@keyframes pulse-online {
    0%, 100% { transform: scale(1); opacity: 1; }
    50% { transform: scale(1.1); opacity: 0.8; }
}

.friend-details {
    display: flex;
    flex-direction: column;
    gap: 2px;
    min-width: 0;
    flex: 1;
}

.friend-name {
    font-weight: 600;
    color: var(--text-primary);
}

.friend-status {
    font-size: 0.75rem;
    font-weight: 500;
}

.online-status {
    color: var(--success);
}

.offline-status {
    color: var(--text-secondary);
}

.friend-actions {
    display: flex;
    gap: var(--spacing-xs);
}

.btn-action {
    width: 28px;
    height: 28px;
    padding: 0;
    background: rgba(102, 126, 234, 0.2);
    border: 1px solid var(--primary);
    border-radius: var(--radius-sm);
    color: var(--primary);
    font-size: 0.875rem;
    cursor: pointer;
    transition: all var(--transition-fast);
    display: flex;
    align-items: center;
    justify-content: center;
}

.btn-action:hover {
    background: var(--primary);
    color: white;
    transform: scale(1.1);
}

.btn-action.danger {
    border-color: var(--error);
    color: var(--error);
}

.btn-action.danger:hover {
    background: var(--error);
    color: white;
}

.friend-requests {
    margin-top: var(--spacing-md);
}

.request-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-sm) var(--spacing-md);
    background: rgba(245, 87, 108, 0.1);
    border: 1px solid rgba(245, 87, 108, 0.3);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-sm);
}

.request-badge {
    position: absolute;
    top: -4px;
    right: -4px;
    width: 18px;
    height: 18px;
    background: var(--error);
    border-radius: 50%;
    font-size: 0.7rem;
    font-weight: 700;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-sm);
}

.loading-text {
    text-align: center;
    padding: var(--spacing-lg);
    color: var(--text-muted);
    font-size: 0.875rem;
}

.empty-state {
    text-align: center;
    padding: var(--spacing-lg);
    color: var(--text-muted);
    font-size: 0.875rem;
}

/* Mobile Touch Controls */
.mobile-controls {
    display: none; /* Hidden by default, shown on mobile via JS */
}

.touch-controls-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-sm);
}

.touch-btn {
    padding: var(--spacing-lg);
    background: var(--primary-gradient);
    border: none;
    border-radius: var(--radius-md);
    color: white;
    font-size: 1.5rem;
    font-weight: 700;
    cursor: pointer;
    transition: all var(--transition-base);
    box-shadow: var(--shadow-md);
    touch-action: manipulation;
    -webkit-tap-highlight-color: transparent;
}

.touch-btn:active {
    transform: scale(0.95);
    box-shadow: var(--shadow-sm);
}

.touch-btn-wide {
    grid-column: span 3;
}

/* ===================================
   FOOTER
   =================================== */
.footer {
    margin-top: auto;
    padding: var(--spacing-xl) 0;
    background: rgba(10, 14, 39, 0.8);
    border-top: 1px solid rgba(102, 126, 234, 0.2);
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--spacing-md);
}

.footer-text {
    color: var(--text-secondary);
    font-size: 0.875rem;
}

.footer-links {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.footer-link {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.875rem;
    transition: color var(--transition-fast);
}

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

.footer-separator {
    color: var(--text-muted);
}

/* ===================================
   UTILITY CLASSES
   =================================== */
.hidden {
    display: none !important;
}

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

/* ===================================
   RESPONSIVE DESIGN
   =================================== */
@media (max-width: 1024px) {
    .hero-content {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .hero-text {
        order: 2;
    }

    .auth-container {
        order: 1;
    }

    .hero-features {
        justify-content: center;
    }

    .game-area {
        grid-template-columns: 1fr;
    }

    .game-main {
        flex-direction: column;
    }

    .next-piece-container {
        flex-direction: row;
        width: 100%;
        justify-content: space-around;
        min-width: auto;
    }

    .hold-title {
        margin-top: 0;
    }

    .game-header {
        flex-direction: column;
        gap: var(--spacing-lg);
    }

    .game-stats {
        width: 100%;
        justify-content: space-around;
    }

    /* Mobile controls disabled - mobile app coming soon */
    /* .mobile-controls {
        display: block !important;
    } */
}

@media (max-width: 768px) {
    html {
        font-size: 14px;
    }

    .hero-title {
        font-size: 3.5rem;
    }

    .container {
        padding: 0 var(--spacing-md);
    }

    .nav-brand {
        font-size: 1.2rem;
    }

    .auth-card {
        padding: var(--spacing-lg);
    }

    .footer-content {
        flex-direction: column;
        text-align: center;
    }

    /* Stack next/hold pieces vertically on small screens */
    .next-piece-container {
        flex-direction: column;
    }

    /* Make touch buttons bigger on phones */
    .touch-btn {
        padding: var(--spacing-xl);
        font-size: 2rem;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 2.5rem;
    }

    .game-stats {
        flex-wrap: wrap;
    }

    .stat-card {
        flex: 1 1 calc(50% - var(--spacing-sm));
        min-width: 80px;
    }
}

/* ===================================
   LOADING & ANIMATIONS
   =================================== */
@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.slide-in {
    animation: slideIn 0.6s ease-out;
}

/* Toast notifications */
.toast {
    position: fixed;
    top: 20px;
    right: 20px;
    padding: var(--spacing-md) var(--spacing-lg);
    background: rgba(10, 14, 39, 0.95);
    border: 1px solid rgba(102, 126, 234, 0.3);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-family: var(--font-body);
    font-size: 0.9rem;
    font-weight: 500;
    box-shadow: var(--shadow-lg);
    backdrop-filter: blur(10px);
    z-index: 10000;
    opacity: 0;
    transform: translateX(400px);
    transition: all 0.3s ease;
    max-width: 300px;
}

.toast.show {
    opacity: 1;
    transform: translateX(0);
}

.toast-success {
    border-color: rgba(34, 197, 94, 0.5);
    background: rgba(21, 128, 61, 0.2);
}

.toast-success::before {
    content: '✓ ';
    color: #22c55e;
    margin-right: var(--spacing-sm);
}

.toast-error {
    border-color: rgba(239, 68, 68, 0.5);
    background: rgba(153, 27, 27, 0.2);
}

.toast-error::before {
    content: '✕ ';
    color: #ef4444;
    margin-right: var(--spacing-sm);
}

.toast-info {
    border-color: rgba(59, 130, 246, 0.5);
    background: rgba(30, 58, 138, 0.2);
}

.toast-info::before {
    content: 'ℹ ';
    color: #3b82f6;
    margin-right: var(--spacing-sm);
}

/* Print styles */
@media print {
    .background-animation,
    .navbar,
    .footer,
    .toast {
        display: none;
    }
}

/* ===================================
   SEED CONTROLS
   =================================== */

.seed-controls {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.seed-input-group {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    background: rgba(15, 20, 40, 0.6);
    padding: var(--spacing-sm);
    border-radius: var(--radius-md);
    border: 1px solid rgba(102, 126, 234, 0.2);
}

.seed-label {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-secondary);
    white-space: nowrap;
}

.seed-input {
    font-family: 'Orbitron', monospace;
    font-size: 0.875rem;
    font-weight: 600;
    padding: var(--spacing-xs) var(--spacing-sm);
    background: rgba(102, 126, 234, 0.1);
    border: 1px solid rgba(102, 126, 234, 0.3);
    border-radius: var(--radius-sm);
    color: var(--primary);
    width: 175px;
    text-align: center;
    letter-spacing: 1px;
    transition: all var(--transition-base);
}

.seed-input:not([readonly]) {
    cursor: text;
}

.seed-input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

.btn-icon-seed {
    width: 32px;
    height: 32px;
    padding: 0;
    background: rgba(102, 126, 234, 0.1);
    border: 1px solid rgba(102, 126, 234, 0.3);
    border-radius: var(--radius-sm);
    font-size: 1.1rem;
    cursor: pointer;
    transition: all var(--transition-base);
    display: flex;
    align-items: center;
    justify-content: center;
}

.btn-icon-seed:hover {
    background: rgba(102, 126, 234, 0.2);
    border-color: var(--primary);
    transform: scale(1.05);
}

.btn-icon-seed:active {
    transform: scale(0.95);
}

/* ===================================
   LEADERBOARD
   =================================== */

.leaderboard-subtitle {
    display: block;
    font-family: 'Orbitron', monospace;
    font-size: 0.75rem;
    font-weight: 400;
    color: var(--text-secondary);
    margin-top: 4px;
    letter-spacing: 1px;
}

.leaderboard-container {
    max-height: 400px;
    overflow-y: auto;
    overflow-x: hidden;
}

.leaderboard-loading {
    text-align: center;
    padding: var(--spacing-lg);
    color: var(--text-secondary);
    font-size: 0.875rem;
}

.leaderboard-entry {
    display: flex;
    align-items: center;
    padding: var(--spacing-sm) var(--spacing-md);
    background: rgba(15, 20, 40, 0.4);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-xs);
    transition: all var(--transition-base);
}

.leaderboard-entry:hover {
    background: rgba(15, 20, 40, 0.6);
    transform: translateX(4px);
}

.leaderboard-entry.user-entry {
    background: rgba(102, 126, 234, 0.15);
    border: 1px solid rgba(102, 126, 234, 0.3);
}

.leaderboard-rank {
    font-family: 'Orbitron', sans-serif;
    font-size: 1rem;
    font-weight: 700;
    color: var(--text-secondary);
    min-width: 32px;
    text-align: center;
}

.leaderboard-rank.rank-1 {
    color: #FFD700;
}

.leaderboard-rank.rank-2 {
    color: #C0C0C0;
}

.leaderboard-rank.rank-3 {
    color: #CD7F32;
}

.leaderboard-username {
    flex: 1;
    font-weight: 600;
    color: var(--text-primary);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.leaderboard-score {
    font-family: 'Orbitron', monospace;
    font-weight: 700;
    font-size: 1.1rem;
    color: var(--primary);
}

.leaderboard-divider {
    margin: var(--spacing-md) 0;
    border: none;
    border-top: 1px dashed rgba(102, 126, 234, 0.3);
}

/* Scrollbar styling for leaderboard */
.leaderboard-container::-webkit-scrollbar {
    width: 6px;
}

.leaderboard-container::-webkit-scrollbar-track {
    background: rgba(15, 20, 40, 0.4);
    border-radius: 3px;
}

.leaderboard-container::-webkit-scrollbar-thumb {
    background: rgba(102, 126, 234, 0.3);
    border-radius: 3px;
}

.leaderboard-container::-webkit-scrollbar-thumb:hover {
    background: rgba(102, 126, 234, 0.5);
}