/* =============================================================
   STEM. AI. Innovation — Custom CSS
   Дополнительные стили поверх Tailwind CSS v3 CDN
   ============================================================= */

/* ── CSS Variables (Design Tokens) ──────────────────────────── */
:root {
    --color-primary: #6366f1;         /* Indigo-500 */
    --color-primary-light: #818cf8;   /* Indigo-400 */
    --color-primary-dark: #4f46e5;    /* Indigo-600 */
    --color-accent: #06b6d4;          /* Cyan-500 */
    --color-success: #10b981;         /* Emerald-500 */
    --color-warning: #f59e0b;         /* Amber-500 */
    --color-danger: #ef4444;          /* Red-500 */
    --color-bg-dark: #0f172a;         /* Slate-900 */
    --color-bg-card: #1e293b;         /* Slate-800 */
    --color-bg-card-hover: #334155;   /* Slate-700 */
    --color-text-primary: #f1f5f9;    /* Slate-100 */
    --color-text-secondary: #94a3b8;  /* Slate-400 */
    --glass-bg: rgba(30, 41, 59, 0.7);
    --glass-border: rgba(148, 163, 184, 0.15);
    --transition-base: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ── Google Fonts ───────────────────────────────────────────── */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800;900&display=swap');

body {
    font-family: 'Inter', system-ui, -apple-system, sans-serif;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* ── Glassmorphism Cards ────────────────────────────────────── */
.glass-card {
    background: var(--glass-bg);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 1px solid var(--glass-border);
    border-radius: 1rem;
    transition: var(--transition-base);
}

.glass-card:hover {
    border-color: rgba(99, 102, 241, 0.3);
    box-shadow: 0 8px 32px rgba(99, 102, 241, 0.1);
    transform: translateY(-2px);
}

/* ── Animations ─────────────────────────────────────────────── */

/* Fade In Up — появление элементов */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.animate-fade-in-up {
    animation: fadeInUp 0.6s cubic-bezier(0.16, 1, 0.3, 1) forwards;
    opacity: 0;
}

/* Staggered delay для списков рейтинга */
.stagger-1 { animation-delay: 0.05s; }
.stagger-2 { animation-delay: 0.10s; }
.stagger-3 { animation-delay: 0.15s; }
.stagger-4 { animation-delay: 0.20s; }
.stagger-5 { animation-delay: 0.25s; }
.stagger-6 { animation-delay: 0.30s; }
.stagger-7 { animation-delay: 0.35s; }
.stagger-8 { animation-delay: 0.40s; }
.stagger-9 { animation-delay: 0.45s; }
.stagger-10 { animation-delay: 0.50s; }

/* Scale In — для карточек */
@keyframes scaleIn {
    from {
        opacity: 0;
        transform: scale(0.9);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

.animate-scale-in {
    animation: scaleIn 0.5s cubic-bezier(0.16, 1, 0.3, 1) forwards;
    opacity: 0;
}

/* Pulse Glow — для активных таймеров */
@keyframes pulseGlow {
    0%, 100% {
        box-shadow: 0 0 20px rgba(99, 102, 241, 0.3);
    }
    50% {
        box-shadow: 0 0 40px rgba(99, 102, 241, 0.6);
    }
}

.animate-pulse-glow {
    animation: pulseGlow 2s ease-in-out infinite;
}

/* Slide In — для leaderboard строк */
@keyframes slideInRight {
    from {
        opacity: 0;
        transform: translateX(100px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

.animate-slide-in {
    animation: slideInRight 0.5s cubic-bezier(0.16, 1, 0.3, 1) forwards;
    opacity: 0;
}

/* Count Up — цифры */
@keyframes countPop {
    0% { transform: scale(1); }
    50% { transform: scale(1.2); }
    100% { transform: scale(1); }
}

.animate-count-pop {
    animation: countPop 0.3s ease-out;
}

/* Shimmer — скелетоны загрузки */
@keyframes shimmer {
    0% {
        background-position: -200% 0;
    }
    100% {
        background-position: 200% 0;
    }
}

.skeleton {
    background: linear-gradient(90deg,
        var(--color-bg-card) 25%,
        var(--color-bg-card-hover) 50%,
        var(--color-bg-card) 75%
    );
    background-size: 200% 100%;
    animation: shimmer 1.5s ease-in-out infinite;
    border-radius: 0.5rem;
}

/* ── Timer Display ──────────────────────────────────────────── */
.timer-display {
    font-variant-numeric: tabular-nums;
    font-feature-settings: "tnum";
    letter-spacing: 0.05em;
}

.timer-danger {
    color: var(--color-danger);
    animation: pulseGlow 0.5s ease-in-out infinite;
}

/* ── Leaderboard ────────────────────────────────────────────── */
.leaderboard-row {
    transition: var(--transition-base);
    border-left: 4px solid transparent;
}

.leaderboard-row:hover {
    background: var(--color-bg-card-hover);
    border-left-color: var(--color-primary);
}

.leaderboard-row.rank-1 { border-left-color: #fbbf24; } /* Gold */
.leaderboard-row.rank-2 { border-left-color: #9ca3af; } /* Silver */
.leaderboard-row.rank-3 { border-left-color: #d97706; } /* Bronze */

.rank-badge {
    width: 2.5rem;
    height: 2.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    font-weight: 700;
    font-size: 0.875rem;
}

.rank-badge.gold { background: linear-gradient(135deg, #fbbf24, #f59e0b); color: #1e293b; }
.rank-badge.silver { background: linear-gradient(135deg, #e2e8f0, #94a3b8); color: #1e293b; }
.rank-badge.bronze { background: linear-gradient(135deg, #f59e0b, #d97706); color: #1e293b; }

/* ── Team Cards Grid (40 команд) ────────────────────────────── */
.team-card {
    transition: var(--transition-base);
    position: relative;
    overflow: hidden;
}

.team-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--color-primary), var(--color-accent));
    transform: scaleX(0);
    transition: transform 0.3s ease;
}

.team-card.completed::before {
    transform: scaleX(1);
}

.team-card.completed {
    border-color: var(--color-success);
    background: rgba(16, 185, 129, 0.1);
}

/* ── Progress Bar ───────────────────────────────────────────── */
.progress-bar {
    height: 0.5rem;
    border-radius: 9999px;
    overflow: hidden;
    background: var(--color-bg-card);
}

.progress-bar-fill {
    height: 100%;
    border-radius: 9999px;
    background: linear-gradient(90deg, var(--color-primary), var(--color-accent));
    transition: width 1s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ── Buttons ────────────────────────────────────────────────── */
.btn-primary {
    background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dark));
    color: white;
    padding: 0.75rem 1.5rem;
    border-radius: 0.75rem;
    font-weight: 600;
    transition: var(--transition-base);
    border: none;
    cursor: pointer;
}

.btn-primary:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 20px rgba(99, 102, 241, 0.4);
}

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

.btn-primary:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none;
    box-shadow: none;
}

/* ── Flash Messages ─────────────────────────────────────────── */
.flash-message {
    animation: fadeInUp 0.4s ease-out, fadeOut 0.4s ease-in 4s forwards;
    position: fixed;
    top: 1.5rem;
    right: 1.5rem;
    z-index: 9999;
    max-width: 400px;
}

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

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

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

::-webkit-scrollbar-thumb {
    background: var(--color-bg-card-hover);
    border-radius: 4px;
}

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

/* ── Charts Container ───────────────────────────────────────── */
.chart-container {
    position: relative;
    width: 100%;
    max-width: 500px;
    margin: 0 auto;
}

/* ── Language Switcher ──────────────────────────────────────── */
.lang-switcher button {
    padding: 0.25rem 0.75rem;
    border-radius: 0.5rem;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    transition: var(--transition-base);
    border: 1px solid transparent;
}

.lang-switcher button.active {
    background: var(--color-primary);
    color: white;
}

.lang-switcher button:not(.active):hover {
    border-color: var(--color-text-secondary);
}

/* ── Responsive ─────────────────────────────────────────────── */
@media (max-width: 768px) {
    .glass-card {
        border-radius: 0.75rem;
    }
    
    .timer-display {
        font-size: 2rem;
    }
}

/* ── Public Screen (Large displays) ─────────────────────────── */
.public-screen {
    min-height: 100vh;
    background: linear-gradient(135deg, #0f172a 0%, #1e1b4b 50%, #0f172a 100%);
}

.public-screen .title-gradient {
    background: linear-gradient(135deg, #818cf8, #06b6d4, #818cf8);
    background-size: 200% auto;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    animation: shimmerText 3s linear infinite;
}

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