/* ScienceKid.org Custom Styles - Science Education Theme */

:root {
    /* Brand Colors */
    --primary-color: #1e40af;
    --secondary-color: #64748b;
    --accent-color: #3b82f6;
    --brand-orange: #f97316;
    
    /* STEM Subject Colors */
    --math-color: #059669;
    --science-color: #0284c7;
    --engineering-color: #dc2626;
    --coding-color: #7c3aed;
    
    /* Status Colors */
    --success-color: #10b981;
    --warning-color: #f59e0b;
    --danger-color: #ef4444;
    --info-color: #06b6d4;
    
    /* Neutral Colors */
    --light-color: #f8fafc;
    --dark-color: #1e293b;
    --text-color: #334155;
    --border-color: #e2e8f0;
    
    /* Background Colors */
    --bg-primary: #ffffff;
    --bg-secondary: #f1f5f9;
    --bg-accent: #e0f2fe;
    
    /* Track Colors - Vibrant */
    --purple: #8b5cf6;
    --pink: #ec4899;
    --orange: #f97316;
    --teal: #14b8a6;
    --indigo: #6366f1;
    
    /* Track Colors - Pastel */
    --lavender: #c4b5fd;
    --mint: #a7f3d0;
    --peach: #fed7aa;
    --sky: #bae6fd;
    --rose: #fecaca;
    --coral: #fbb6ce;
    --lime: #d9f99d;
    --violet: #ddd6fe;
    
    /* Shadows */
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 8px 20px rgba(30, 64, 175, 0.15);
    --shadow-xl: 0 12px 24px rgba(30, 64, 175, 0.15);
    
    /* Transitions */
    --transition: all 0.3s ease;
    --transition-fast: all 0.2s ease;
}

/* Gradients */
.bg-gradient-primary { background: linear-gradient(135deg, var(--primary-color) 0%, var(--accent-color) 100%); }
.bg-gradient-success { background: linear-gradient(135deg, var(--success-color) 0%, var(--math-color) 100%); }
.bg-gradient-warning { background: linear-gradient(135deg, var(--warning-color) 0%, var(--brand-orange) 100%); }
.bg-gradient-science { background: linear-gradient(135deg, var(--science-color) 0%, var(--info-color) 100%); }
.bg-gradient-brand { background: linear-gradient(135deg, var(--primary-color) 0%, var(--brand-orange) 100%); }

/* Hero Section */
.hero-section {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--brand-orange) 100%);
    border-radius: 15px;
    box-shadow: 0 10px 30px rgba(30, 64, 175, 0.3);
    position: relative;
    overflow: hidden;
}

.hero-section::before {
    content: '';
    position: absolute;
    inset: 0;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><defs><pattern id="grain" width="100" height="100" patternUnits="userSpaceOnUse"><circle cx="25" cy="25" r="1" fill="white" opacity="0.1"/><circle cx="75" cy="75" r="1" fill="white" opacity="0.1"/><circle cx="50" cy="10" r="0.5" fill="white" opacity="0.1"/><circle cx="10" cy="60" r="0.5" fill="white" opacity="0.1"/><circle cx="90" cy="40" r="0.5" fill="white" opacity="0.1"/></pattern></defs><rect width="100" height="100" fill="url(%23grain)"/></svg>');
    pointer-events: none;
}

/* Cards */
.card {
    border-radius: 12px;
    border: 1px solid var(--border-color);
    background: var(--bg-primary);
    transition: transform 0.2s ease-in-out, box-shadow 0.2s ease-in-out;
    box-shadow: var(--shadow-sm);
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-md);
}

.card-header {
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    border-radius: 12px 12px 0 0 !important;
}

/* Challenge Cards */
.challenge-card {
    border-left: 4px solid var(--primary-color);
    border-radius: 12px;
    box-shadow: var(--shadow-sm);
}

.challenge-card.math { border-left-color: var(--math-color); background: linear-gradient(135deg, rgba(5, 150, 105, 0.05) 0%, rgba(16, 185, 129, 0.05) 100%); }
.challenge-card.science { border-left-color: var(--science-color); background: linear-gradient(135deg, rgba(2, 132, 199, 0.05) 0%, rgba(6, 182, 212, 0.05) 100%); }
.challenge-card.engineering { border-left-color: var(--engineering-color); background: linear-gradient(135deg, rgba(220, 38, 38, 0.05) 0%, rgba(239, 68, 68, 0.05) 100%); }
.challenge-card.coding { border-left-color: var(--coding-color); background: linear-gradient(135deg, rgba(124, 58, 237, 0.05) 0%, rgba(139, 92, 246, 0.05) 100%); }

/* Buttons */
.btn {
    transition: var(--transition-fast);
    border-radius: 25px;
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--brand-orange) 100%);
    border: none;
    border-radius: 8px;
    font-weight: 600;
    padding: 0.75rem 1.5rem;
    box-shadow: 0 4px 6px rgba(30, 64, 175, 0.2);
}

.btn-primary:hover {
    background: linear-gradient(135deg, #1e3a8a 0%, #ea580c 100%);
    transform: translateY(-1px);
    box-shadow: 0 6px 12px rgba(30, 64, 175, 0.3);
}

.btn-outline-engineering { color: var(--engineering-color) !important; border-color: var(--engineering-color) !important; }
.btn-outline-engineering:hover { color: #fff !important; background-color: var(--engineering-color) !important; border-color: var(--engineering-color) !important; }
.btn-outline-coding { color: var(--coding-color) !important; border-color: var(--coding-color) !important; }
.btn-outline-coding:hover { color: #fff !important; background-color: var(--coding-color) !important; border-color: var(--coding-color) !important; }

/* Badges */
.badge {
    border-radius: 6px;
    font-weight: 500;
}

.badge-custom {
    font-size: 0.8rem;
    padding: 0.5rem 1rem;
    border-radius: 20px;
}

.badge.bg-success { background-color: var(--math-color) !important; }
.badge.bg-info { background-color: var(--science-color) !important; }
.badge.bg-warning { background-color: var(--engineering-color) !important; }
.badge.bg-danger { background-color: var(--coding-color) !important; }

/* Color Utilities - Vibrant */
.bg-purple, .text-purple { color: var(--purple); }
.bg-purple { background-color: var(--purple) !important; }
.bg-pink, .text-pink { color: var(--pink); }
.bg-pink { background-color: var(--pink) !important; }
.bg-orange, .text-orange { color: var(--orange); }
.bg-orange { background-color: var(--orange) !important; }
.bg-teal, .text-teal { color: var(--teal); }
.bg-teal { background-color: var(--teal) !important; }
.bg-indigo, .text-indigo { color: var(--indigo); }
.bg-indigo { background-color: var(--indigo) !important; }

/* Color Utilities - Pastel */
.bg-lavender, .text-lavender { color: var(--lavender); }
.bg-lavender { background-color: var(--lavender) !important; }
.bg-mint, .text-mint { color: var(--mint); }
.bg-mint { background-color: var(--mint) !important; }
.bg-peach, .text-peach { color: var(--peach); }
.bg-peach { background-color: var(--peach) !important; }
.bg-sky, .text-sky { color: var(--sky); }
.bg-sky { background-color: var(--sky) !important; }
.bg-rose, .text-rose { color: var(--rose); }
.bg-rose { background-color: var(--rose) !important; }
.bg-coral, .text-coral { color: var(--coral); }
.bg-coral { background-color: var(--coral) !important; }
.bg-lime, .text-lime { color: var(--lime); }
.bg-lime { background-color: var(--lime) !important; }
.bg-violet, .text-violet { color: var(--violet); }
.bg-violet { background-color: var(--violet) !important; }

/* Badge Text Colors */
.badge.bg-purple, .badge.bg-pink, .badge.bg-orange, .badge.bg-teal, .badge.bg-indigo { color: #fff !important; }
.badge.bg-lavender { color: #4c1d95 !important; }
.badge.bg-mint { color: #064e3b !important; }
.badge.bg-peach { color: #9a3412 !important; }
.badge.bg-sky { color: #0c4a6e !important; }
.badge.bg-rose { color: #991b1b !important; }
.badge.bg-coral { color: #be185d !important; }
.badge.bg-lime { color: #365314 !important; }
.badge.bg-violet { color: #581c87 !important; }

/* Gradient Utilities */
.bg-gradient-purple { background: linear-gradient(135deg, var(--purple) 0%, #a855f7 100%); }
.bg-gradient-pink { background: linear-gradient(135deg, var(--pink) 0%, #f472b6 100%); }
.bg-gradient-orange { background: linear-gradient(135deg, var(--orange) 0%, #fb923c 100%); }
.bg-gradient-teal { background: linear-gradient(135deg, var(--teal) 0%, #2dd4bf 100%); }
.bg-gradient-indigo { background: linear-gradient(135deg, var(--indigo) 0%, #818cf8 100%); }
.bg-gradient-lavender { background: linear-gradient(135deg, var(--lavender) 0%, #ddd6fe 100%); }
.bg-gradient-mint { background: linear-gradient(135deg, var(--mint) 0%, #d1fae5 100%); }
.bg-gradient-peach { background: linear-gradient(135deg, var(--peach) 0%, var(--peach) 100%); }
.bg-gradient-sky { background: linear-gradient(135deg, var(--sky) 0%, #e0f2fe 100%); }
.bg-gradient-rose { background: linear-gradient(135deg, var(--rose) 0%, #fde2e8 100%); }
.bg-gradient-coral { background: linear-gradient(135deg, var(--coral) 0%, #fce7f3 100%); }
.bg-gradient-lime { background: linear-gradient(135deg, var(--lime) 0%, #ecfccb 100%); }
.bg-gradient-violet { background: linear-gradient(135deg, var(--violet) 0%, #ede9fe 100%); }

/* Announcements - Timeline Style */
.announcements-timeline-wrapper {
    position: relative;
    padding: 1rem 0;
    overflow-x: auto;
    overflow-y: hidden;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: thin;
    scrollbar-color: var(--primary-color) transparent;
}

.announcements-timeline-wrapper::-webkit-scrollbar { height: 8px; }
.announcements-timeline-wrapper::-webkit-scrollbar-track { background: var(--bg-secondary); border-radius: 4px; }
.announcements-timeline-wrapper::-webkit-scrollbar-thumb { background: var(--primary-color); border-radius: 4px; }
.announcements-timeline-wrapper::-webkit-scrollbar-thumb:hover { background: #1e3a8a; }

.announcements-timeline {
    display: flex;
    gap: 1.5rem;
    padding: 0.5rem 0;
    min-width: min-content;
    justify-content: center;
}

.announcement-timeline-item {
    flex: 0 0 320px;
    min-width: 320px;
}

.announcement-timeline-card {
    background: #fff;
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 1.25rem;
    height: 140px;
    position: relative;
    transition: var(--transition);
    display: flex;
    flex-direction: column;
    box-shadow: var(--shadow-sm);
}

.announcement-timeline-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-color);
}

.announcement-timeline-date {
    position: absolute;
    top: -12px;
    left: 1.25rem;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--brand-orange) 100%);
    color: #fff;
    padding: 0.5rem 0.75rem;
    border-radius: 8px;
    font-weight: 600;
    font-size: 0.75rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    line-height: 1.2;
    box-shadow: 0 4px 8px rgba(30, 64, 175, 0.2);
    z-index: 2;
}

.announcement-timeline-date .date-day { font-size: 1.25rem; font-weight: 700; line-height: 1; }
.announcement-timeline-date .date-month { font-size: 0.7rem; text-transform: uppercase; opacity: 0.9; margin-top: 2px; }

.announcement-timeline-content {
    margin-top: 1.5rem;
    flex-grow: 1;
    display: flex;
    flex-direction: column;
}

.announcement-timeline-title {
    font-size: 1rem;
    font-weight: 600;
    color: var(--dark-color);
    margin-bottom: 0.5rem;
    line-height: 1.3;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.announcement-timeline-preview {
    font-size: 0.875rem;
    color: var(--text-color);
    margin: 0;
    line-height: 1.4;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    flex-grow: 1;
}

.announcement-timeline-icon {
    position: absolute;
    top: 1rem;
    right: 1rem;
    width: 32px;
    height: 32px;
    background: linear-gradient(135deg, #fef3c7 0%, #fde68a 100%);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.875rem;
    color: #f59e0b;
}

/* Announcement Blog Roll Style */
.announcements-blog-roll {
    max-width: 900px;
    margin: 0 auto;
}

.announcement-blog-item {
    background: #fff;
    border-radius: 12px;
    border: 1px solid var(--border-color);
    padding: 2rem;
    margin-bottom: 2rem;
    transition: var(--transition);
    display: flex;
    gap: 2rem;
    box-shadow: var(--shadow-sm);
    position: relative;
}

.announcement-blog-item:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-color);
}

.announcement-blog-item::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 4px;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--brand-orange) 100%);
    border-radius: 12px 0 0 12px;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.announcement-blog-item:hover::before {
    opacity: 1;
}

.announcement-blog-date {
    flex-shrink: 0;
    width: 100px;
}

.date-badge {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--brand-orange) 100%);
    color: #fff;
    padding: 1rem;
    border-radius: 12px;
    text-align: center;
    box-shadow: 0 4px 8px rgba(30, 64, 175, 0.2);
    display: flex;
    flex-direction: column;
    align-items: center;
}

.date-badge .date-day {
    font-size: 2rem;
    font-weight: 700;
    line-height: 1;
    margin-bottom: 0.25rem;
}

.date-badge .date-month {
    font-size: 0.875rem;
    text-transform: uppercase;
    font-weight: 600;
    opacity: 0.95;
    margin-bottom: 0.125rem;
}

.date-badge .date-year {
    font-size: 0.75rem;
    opacity: 0.9;
}

.announcement-blog-content {
    flex-grow: 1;
}

.announcement-blog-header {
    margin-bottom: 1rem;
}

.announcement-blog-title {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--dark-color);
    margin: 0;
    line-height: 1.3;
}

.announcement-blog-body {
    margin-top: 1rem;
}

.announcement-blog-text {
    font-size: 1rem;
    line-height: 1.7;
    color: var(--text-color);
    margin: 0;
    white-space: pre-wrap;
    word-wrap: break-word;
}

@media (max-width: 768px) {
    .announcement-blog-item {
        flex-direction: column;
        padding: 1.5rem;
        gap: 1.5rem;
    }
    
    .announcement-blog-date {
        width: 100%;
    }
    
    .date-badge {
        width: 120px;
        margin: 0 auto;
    }
    
    .announcement-blog-title {
        font-size: 1.25rem;
    }
    
    .announcement-blog-item::before {
        width: 100%;
        height: 4px;
        border-radius: 12px 12px 0 0;
    }
}

/* Other Components */
.badge-custom { font-size: 0.8rem; padding: 0.5rem 1rem; border-radius: 20px; }
.progress { height: 8px; border-radius: 10px; background-color: #e9ecef; }
.progress-bar { border-radius: 10px; background: linear-gradient(90deg, var(--primary-color) 0%, #0056b3 100%); }
.streak-indicator { position: relative; display: inline-block; }
.streak-indicator::before { content: '🔥'; position: absolute; left: -25px; top: 50%; transform: translateY(-50%); font-size: 1.2rem; }
.xp-display { background: linear-gradient(45deg, #ffd700, #ffed4e); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; font-weight: bold; }
.leaderboard-row { transition: background-color 0.2s ease; }
.leaderboard-row:hover { background-color: rgba(0, 123, 255, 0.05); }
.form-control { border-radius: 10px; border: 2px solid #e9ecef; transition: border-color 0.2s ease; }
.form-control:focus { border-color: var(--primary-color); box-shadow: 0 0 0 0.2rem rgba(0, 123, 255, 0.25); }
.alert { border-radius: 10px; border: none; box-shadow: var(--shadow-sm); }

/* Navigation */
.navbar-brand {
    font-weight: bold;
    font-size: 1.5rem;
    display: flex;
    align-items: center;
}

.navbar-brand .logo-img {
    height: 44px;
    width: auto;
    transition: var(--transition);
    opacity: 1;
    display: block;
    max-width: none;
}

.navbar-brand:hover .logo-img {
    opacity: 1;
    transform: scale(1.05);
    filter: drop-shadow(0 0 8px rgba(0, 0, 0, 0.3));
}

.navbar-nav .nav-link {
    font-weight: 500;
    transition: color 0.2s ease;
    color: rgba(255, 255, 255, 0.9) !important;
}

.navbar-nav .nav-link:hover { color: #fff !important; }

/* STEM Icons */
.stem-icon {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    color: #fff;
    margin: 0 auto 1rem;
}

.stem-icon.math { background: linear-gradient(135deg, var(--math-color) 0%, var(--success-color) 100%); }
.stem-icon.science { background: linear-gradient(135deg, var(--science-color) 0%, var(--info-color) 100%); }
.stem-icon.engineering { background: linear-gradient(135deg, var(--engineering-color) 0%, #f87171 100%); }
.stem-icon.coding { background: linear-gradient(135deg, var(--coding-color) 0%, #a78bfa 100%); }

/* Body & General */
body {
    background-color: var(--bg-secondary);
    color: var(--text-color);
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
}

footer { margin-top: auto; }

.science-pattern {
    background-image: 
        radial-gradient(circle at 20% 50%, rgba(14, 165, 233, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 80% 20%, rgba(5, 150, 105, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 40% 80%, rgba(124, 58, 237, 0.1) 0%, transparent 50%);
}

/* Scrollbar */
::-webkit-scrollbar { width: 8px; }
::-webkit-scrollbar-track { background: #f1f1f1; border-radius: 10px; }
::-webkit-scrollbar-thumb { background: var(--primary-color); border-radius: 10px; }
::-webkit-scrollbar-thumb:hover { background: var(--primary-color); }

/* Animations */
.fade-in { animation: fadeIn 0.5s ease-in; }
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

.slide-in-left { animation: slideInLeft 0.5s ease-out; }
@keyframes slideInLeft {
    from { opacity: 0; transform: translateX(-30px); }
    to { opacity: 1; transform: translateX(0); }
}

.slide-in-right { animation: slideInRight 0.5s ease-out; }
@keyframes slideInRight {
    from { opacity: 0; transform: translateX(30px); }
    to { opacity: 1; transform: translateX(0); }
}

.spinner {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    border-top-color: #fff;
    animation: spin 1s ease-in-out infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* Responsive */
@media (max-width: 768px) {
    .hero-section { padding: 2rem 1rem; }
    .display-4 { font-size: 2rem; }
    .card { margin-bottom: 1rem; }
    .announcement-timeline-item { flex: 0 0 280px; min-width: 280px; }
    .announcement-timeline-card { height: 130px; padding: 1rem; }
    .announcement-timeline-date { left: 1rem; padding: 0.4rem 0.6rem; }
    .announcement-timeline-date .date-day { font-size: 1.1rem; }
}