/* Custom Styles for Bootstrap Integration */

/* ============================================================================
   ARTISTIC COLOR SCHEME - Sound Training
   A cohesive, vibrant design inspired by language diversity and learning
   ============================================================================ */

:root {
    /* Primary Gradient - Purple to Blue (Knowledge & Communication) */
    --primary-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --primary-color: #667eea;
    --secondary-color: #764ba2;

    /* Accent Colors */
    --accent-teal: #06b6d4;
    --accent-orange: #f59e0b;
    --accent-pink: #ec4899;
    --accent-green: #10b981;

    /* Background Layers */
    --bg-gradient-main: linear-gradient(135deg, #667eea 0%, #764ba2 50%, #06b6d4 100%);
    --bg-gradient-light: linear-gradient(135deg, #f0f4ff 0%, #faf5ff 50%, #f0fdff 100%);
    --bg-overlay: rgba(255, 255, 255, 0.95);

    /* Text Colors */
    --text-primary: #1f2937;
    --text-secondary: #6b7280;
    --text-light: #ffffff;

    /* Card & Surface Colors */
    --surface-white: #ffffff;
    --surface-light: #f9fafb;
    --surface-accent: #fef3c7;

    /* Shadow System */
    --shadow-sm: 0 2px 8px rgba(102, 126, 234, 0.1);
    --shadow-md: 0 4px 16px rgba(102, 126, 234, 0.15);
    --shadow-lg: 0 8px 32px rgba(102, 126, 234, 0.2);
    --shadow-xl: 0 12px 48px rgba(102, 126, 234, 0.25);
}

/* ============================================================================
   GLOBAL STYLES
   ============================================================================ */

body {
    background: var(--bg-gradient-main);
    background-attachment: fixed;
    min-height: 100vh;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    color: var(--text-primary);
    position: relative;
}

/* Subtle pattern overlay for texture */
body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image:
        radial-gradient(circle at 20% 50%, rgba(255, 255, 255, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 80% 80%, rgba(255, 255, 255, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 40% 20%, rgba(6, 182, 212, 0.1) 0%, transparent 50%);
    pointer-events: none;
    z-index: 0;
}

/* Ensure content is above the overlay */
.container-fluid,
.container {
    position: relative;
    z-index: 1;
}

/* ============================================================================
   HEADER STYLES
   ============================================================================ */

header {
    background: var(--primary-gradient) !important;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
    position: relative;
    overflow: hidden;
}

/* Animated gradient overlay for headers */
header::after {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg,
        transparent 0%,
        rgba(255, 255, 255, 0.1) 50%,
        transparent 100%);
    animation: shimmer 3s infinite;
}

@keyframes shimmer {
    0% { left: -100%; }
    100% { left: 100%; }
}

/* ============================================================================
   NAVIGATION & FOOTER
   ============================================================================ */

.navbar {
    background: linear-gradient(135deg, #1f2937 0%, #374151 100%) !important;
    box-shadow: var(--shadow-md);
    backdrop-filter: blur(10px);
}

.navbar-brand {
    font-weight: 700;
    font-size: 1.5rem;
    background: linear-gradient(135deg, var(--accent-teal), var(--accent-pink));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav-link {
    position: relative;
    transition: all 0.3s ease;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    width: 0;
    height: 2px;
    background: var(--accent-teal);
    transition: all 0.3s ease;
    transform: translateX(-50%);
}

.nav-link:hover::after {
    width: 80%;
}

footer {
    background: linear-gradient(135deg, #1f2937 0%, #111827 100%) !important;
    box-shadow: 0 -4px 20px rgba(0, 0, 0, 0.1);
    margin-top: 5rem !important;
}

/* ============================================================================
   CARDS & SURFACES
   ============================================================================ */

.card {
    border: none;
    background: var(--surface-white);
    box-shadow: var(--shadow-sm);
    transition: all 0.3s ease;
    border-radius: 1rem;
    overflow: hidden;
}

.card:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-4px);
}

/* Language Cards */
.language-card {
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    background: linear-gradient(135deg, #ffffff 0%, #f9fafb 100%);
    border: 2px solid transparent;
}

.language-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-xl);
    border-color: var(--primary-color);
    background: linear-gradient(135deg, #ffffff 0%, #fef3ff 100%);
}

/* ============================================================================
   BUTTONS
   ============================================================================ */

.btn {
    border-radius: 0.75rem;
    font-weight: 600;
    padding: 0.75rem 1.5rem;
    transition: all 0.3s ease;
    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, 0.3);
    transform: translate(-50%, -50%);
    transition: width 0.6s, height 0.6s;
}

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

.btn-primary {
    background: var(--primary-gradient);
    border: none;
    color: white;
    box-shadow: var(--shadow-sm);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
    background: linear-gradient(135deg, #764ba2 0%, #667eea 100%);
}

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

.btn-primary:disabled {
    background: #6c757d;
    opacity: 0.6;
    transform: none;
}

.btn-success {
    background: linear-gradient(135deg, var(--accent-green) 0%, #059669 100%);
    border: none;
    box-shadow: var(--shadow-sm);
}

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

.btn-danger {
    background: linear-gradient(135deg, #ef4444 0%, #dc2626 100%);
    border: none;
    box-shadow: var(--shadow-sm);
}

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

.btn-light {
    background: linear-gradient(135deg, #ffffff 0%, #f9fafb 100%);
    color: var(--text-primary);
    border: 2px solid rgba(102, 126, 234, 0.2);
    box-shadow: var(--shadow-sm);
}

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

.btn-outline-primary {
    border: 2px solid var(--primary-color);
    color: var(--primary-color);
    background: transparent;
}

.btn-outline-primary:hover {
    background: var(--primary-gradient);
    color: white;
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.btn-outline-light {
    border: 2px solid rgba(255, 255, 255, 0.5);
    color: white;
    background: transparent;
}

.btn-outline-light:hover {
    background: rgba(255, 255, 255, 0.2);
    border-color: white;
    transform: translateY(-2px);
}

/* ============================================================================
   FORM CONTROLS
   ============================================================================ */

.form-control,
.form-select {
    border: 2px solid #e5e7eb;
    border-radius: 0.75rem;
    padding: 0.75rem 1rem;
    transition: all 0.3s ease;
    background: var(--surface-white);
}

.form-control:focus,
.form-select:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 0.25rem rgba(102, 126, 234, 0.15);
    background: var(--surface-white);
}

/* ============================================================================
   ALERTS & NOTIFICATIONS
   ============================================================================ */

.alert {
    border: none;
    border-radius: 1rem;
    padding: 1.25rem;
    box-shadow: var(--shadow-sm);
}

.alert-info {
    background: linear-gradient(135deg, #dbeafe 0%, #bfdbfe 100%);
    color: #1e40af;
}

.alert-success {
    background: linear-gradient(135deg, #d1fae5 0%, #a7f3d0 100%);
    color: #065f46;
}

.alert-warning {
    background: linear-gradient(135deg, #fef3c7 0%, #fde68a 100%);
    color: #92400e;
}

.alert-danger {
    background: linear-gradient(135deg, #fee2e2 0%, #fecaca 100%);
    color: #991b1b;
}

/* ============================================================================
   SECTIONS & CONTAINERS
   ============================================================================ */

.quick-test,
.info {
    background: linear-gradient(135deg, #ffffff 0%, #f9fafb 100%);
    border-radius: 1rem;
    padding: 2rem;
    box-shadow: var(--shadow-sm);
}

/* ============================================================================
   STATUS MESSAGES
   ============================================================================ */

.status {
    padding: 1.25rem;
    border-radius: 1rem;
    display: none;
    font-weight: 500;
    box-shadow: var(--shadow-sm);
}

.status.loading {
    background: linear-gradient(135deg, #fef3c7 0%, #fde68a 100%);
    color: #92400e;
    border: 2px solid #fbbf24;
    display: block;
}

.status.success {
    background: linear-gradient(135deg, #d1fae5 0%, #a7f3d0 100%);
    color: #065f46;
    border: 2px solid #10b981;
    display: block;
}

.status.error {
    background: linear-gradient(135deg, #fee2e2 0%, #fecaca 100%);
    color: #991b1b;
    border: 2px solid #ef4444;
    display: block;
}

/* ============================================================================
   AUDIO PLAYER
   ============================================================================ */

.audio-player {
    display: none;
    border-radius: 0.75rem;
    box-shadow: var(--shadow-sm);
}

.audio-player[src] {
    display: block;
}

/* ============================================================================
   LIST GROUPS & BADGES
   ============================================================================ */

.list-group-item {
    border-left: 4px solid transparent;
    transition: all 0.3s ease;
    border-radius: 0.75rem;
    margin-bottom: 0.5rem;
    background: var(--surface-white);
    box-shadow: var(--shadow-sm);
}

.list-group-item:hover {
    border-left-color: var(--primary-color);
    background: linear-gradient(135deg, #ffffff 0%, #f0f4ff 100%);
    padding-left: 1.5rem;
    box-shadow: var(--shadow-md);
}

.badge {
    padding: 0.5rem 1rem;
    border-radius: 0.5rem;
    font-weight: 600;
    font-size: 0.875rem;
}

.badge.bg-success {
    background: linear-gradient(135deg, var(--accent-green) 0%, #059669 100%) !important;
}

.badge.bg-warning {
    background: linear-gradient(135deg, var(--accent-orange) 0%, #d97706 100%) !important;
    color: white !important;
}

.badge.bg-danger {
    background: linear-gradient(135deg, #ef4444 0%, #dc2626 100%) !important;
}

.badge.bg-primary {
    background: var(--primary-gradient) !important;
}

.badge.bg-info {
    background: linear-gradient(135deg, var(--accent-teal) 0%, #0891b2 100%) !important;
}

/* ============================================================================
   MAIN CONTENT AREAS
   ============================================================================ */

main {
    background: var(--bg-overlay);
    border-radius: 2rem 2rem 0 0;
    margin-top: -2rem;
    position: relative;
    z-index: 2;
    box-shadow: 0 -4px 20px rgba(0, 0, 0, 0.05);
    padding-top: 2rem;
    padding-bottom: 2rem;
}

/* Hero Section Enhancement */
.display-3,
.display-4,
.display-5 {
    font-weight: 800;
    background: linear-gradient(135deg, #ffffff 0%, #f0f9ff 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    text-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

.lead {
    font-weight: 500;
    opacity: 0.95;
}

.subtitle {
    font-weight: 600;
    letter-spacing: 0.05em;
    text-transform: uppercase;
    font-size: 1rem;
    opacity: 0.9;
}

/* ============================================================================
   RESPONSIVE TYPOGRAPHY
   ============================================================================ */

@media (max-width: 576px) {
    header h1 {
        font-size: 1.75rem !important;
    }

    .lead {
        font-size: 1rem;
    }

    main {
        border-radius: 1rem 1rem 0 0;
        margin-top: -1rem;
    }
}

/* ============================================================================
   ANIMATIONS & TRANSITIONS
   ============================================================================ */

/* Smooth animations */
* {
    transition: background-color 0.3s ease, color 0.3s ease;
}

button,
a,
.card,
.form-control,
.form-select {
    transition: all 0.3s ease;
}

/* Fade in animation for page load */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.container,
.card {
    animation: fadeIn 0.6s ease-out;
}

/* Pulse animation for important elements */
@keyframes pulse {
    0%, 100% {
        transform: scale(1);
    }
    50% {
        transform: scale(1.05);
    }
}

.btn-primary:focus {
    animation: pulse 0.5s ease-in-out;
}

/* ============================================================================
   SCROLLBAR CUSTOMIZATION
   ============================================================================ */

::-webkit-scrollbar {
    width: 12px;
}

::-webkit-scrollbar-track {
    background: linear-gradient(180deg, #f9fafb 0%, #f3f4f6 100%);
}

::-webkit-scrollbar-thumb {
    background: var(--primary-gradient);
    border-radius: 6px;
    border: 2px solid #f9fafb;
}

::-webkit-scrollbar-thumb:hover {
    background: linear-gradient(135deg, #764ba2 0%, #667eea 100%);
}

/* ============================================================================
   LOADING INDICATORS
   ============================================================================ */

.spinner-border-sm {
    width: 1rem;
    height: 1rem;
    border-width: 0.15em;
}

.spinner-border {
    border-color: var(--primary-color);
    border-right-color: transparent;
}

/* ============================================================================
   SPECIAL COMPONENTS
   ============================================================================ */

/* Progress bars */
.progress {
    height: 0.75rem;
    border-radius: 0.5rem;
    background: linear-gradient(135deg, #f3f4f6 0%, #e5e7eb 100%);
    box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.05);
}

.progress-bar {
    background: var(--primary-gradient);
    border-radius: 0.5rem;
    box-shadow: 0 2px 4px rgba(102, 126, 234, 0.3);
}

/* Tooltips enhancement */
.tooltip-inner {
    background: linear-gradient(135deg, #1f2937 0%, #374151 100%);
    border-radius: 0.5rem;
    padding: 0.5rem 1rem;
    box-shadow: var(--shadow-md);
}

/* ============================================================================
   LANGUAGE MAP (Interactive Visual Component)
   ============================================================================ */

.language-map {
    background: linear-gradient(135deg,
        rgba(255, 255, 255, 0.98) 0%,
        rgba(240, 248, 255, 0.98) 25%,
        rgba(255, 250, 240, 0.98) 50%,
        rgba(255, 245, 238, 0.98) 75%,
        rgba(245, 255, 250, 0.98) 100%
    );
    border-radius: 2rem;
    padding: 3rem;
    box-shadow: var(--shadow-xl);
    position: relative;
    overflow: hidden;
    border: 2px solid rgba(102, 126, 234, 0.1);
}

.language-map::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background:
        radial-gradient(circle at 20% 30%, rgba(102, 126, 234, 0.05) 0%, transparent 50%),
        radial-gradient(circle at 80% 70%, rgba(6, 182, 212, 0.05) 0%, transparent 50%),
        radial-gradient(circle at 50% 50%, rgba(236, 72, 153, 0.03) 0%, transparent 60%);
    pointer-events: none;
}

.language-map .btn {
    position: relative;
    z-index: 10;
    transition: all 0.3s ease;
    white-space: nowrap;
    font-weight: 600;
}

.language-map .btn:hover {
    transform: scale(1.1) translateY(-3px);
    z-index: 20;
}

/* Responsive adjustments for language map */
@media (max-width: 992px) {
    .language-map {
        min-height: 800px !important;
    }
    
    .language-map .position-absolute {
        position: static !important;
        display: inline-block;
        margin: 10px 5px;
    }
    
    .language-map {
        text-align: center;
    }
}

@media (max-width: 576px) {
    .language-map .btn-lg {
        font-size: 0.9rem;
        padding: 0.5rem 1rem;
    }
}