/* ===== Variables CSS ===== */
:root {
    --primary-color: #667eea;
    --secondary-color: #764ba2;
    --success-color: #28a745;
    --warning-color: #ffc107;
    --danger-color: #dc3545;
    --info-color: #17a2b8;
    --dark-color: #2c3e50;
    --light-color: #f8f9fa;
    --white: #ffffff;
    --gray-100: #f8f9fa;
    --gray-200: #e9ecef;
    --gray-300: #dee2e6;
    --gray-400: #ced4da;
    --gray-500: #adb5bd;
    --gray-600: #6c757d;
    --gray-700: #495057;
    --gray-800: #343a40;
    --gray-900: #212529;
    
    --font-primary: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    --font-secondary: 'Georgia', 'Times New Roman', serif;
    
    --transition-base: all 0.3s ease;
    --shadow-sm: 0 0.125rem 0.25rem rgba(0,0,0,0.075);
    --shadow-md: 0 0.5rem 1rem rgba(0,0,0,0.15);
    --shadow-lg: 0 1rem 3rem rgba(0,0,0,0.175);
    --shadow-xl: 0 1.5rem 4rem rgba(0,0,0,0.2);
    
    --border-radius: 0.75rem;
    --border-radius-lg: 1.25rem;
    --border-radius-xl: 1.75rem;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-primary);
    font-size: 16px;
    line-height: 1.6;
    color: var(--gray-800);
    background-color: var(--white);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: 1.2;
    margin-bottom: 1rem;
    color: var(--dark-color);
}

h1 { font-size: 2.5rem; }
h2 { font-size: 2rem; }
h3 { font-size: 1.75rem; }
h4 { font-size: 1.5rem; }
h5 { font-size: 1.25rem; }
h6 { font-size: 1rem; }

p {
    margin-bottom: 1rem;
}

a {
    color: var(--primary-color);
    text-decoration: none;
    transition: var(--transition-base);
}

a:hover {
    color: var(--secondary-color);
}

/* ===== Container & Layout ===== */
.container {
    width: 100%;
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 1.5rem;
}

.container-fluid {
    width: 100%;
    padding: 0 1.5rem;
}

.section {
    padding: 5rem 0;
}

/* ===== Hero Section ===== */
.hero {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    color: var(--white);
    min-height: 100vh;
    display: flex;
    align-items: center;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 1440 320"><path fill="%23ffffff" fill-opacity="0.1" d="M0,96L48,112C96,128,192,160,288,160C384,160,480,128,576,122.7C672,117,768,139,864,154.7C960,171,1056,181,1152,165.3C1248,149,1344,107,1392,85.3L1440,64L1440,320L1392,320C1344,320,1248,320,1152,320C1056,320,960,320,864,320C768,320,672,320,576,320C480,320,384,320,288,320C192,320,96,320,48,320L0,320Z"></path></svg>') no-repeat bottom;
    background-size: cover;
}

.hero-content {
    position: relative;
    z-index: 1;
    text-align: center;
}

.hero-logo {
    font-size: 4rem;
    font-weight: 700;
    margin-bottom: 1rem;
    background: linear-gradient(45deg, var(--white), rgba(255,255,255,0.9));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    text-shadow: 0 0 30px rgba(255,255,255,0.3);
}

.hero-tagline {
    font-size: 1.5rem;
    font-weight: 300;
    margin-bottom: 2rem;
    opacity: 0.95;
}

.hero-subtitle {
    font-size: 1.1rem;
    opacity: 0.85;
    margin-bottom: 3rem;
}

/* ===== Audio Player ===== */
.audio-player {
    background: rgba(255,255,255,0.15);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255,255,255,0.2);
    border-radius: var(--border-radius-xl);
    padding: 1.5rem;
    margin: 2rem auto;
    max-width: 600px;
}

.audio-controls {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.play-button {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    background: var(--white);
    color: var(--primary-color);
    border: none;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    transition: var(--transition-base);
    box-shadow: var(--shadow-md);
}

.play-button:hover {
    transform: scale(1.1);
    box-shadow: var(--shadow-lg);
}

.audio-info {
    flex: 1;
}

.audio-title {
    font-weight: 600;
    margin-bottom: 0.25rem;
}

.audio-duration {
    font-size: 0.9rem;
    opacity: 0.8;
}

.audio-progress {
    width: 100%;
    height: 6px;
    background: rgba(255,255,255,0.3);
    border-radius: 3px;
    margin-top: 1rem;
    cursor: pointer;
    position: relative;
}

.audio-progress-bar {
    height: 100%;
    background: var(--white);
    border-radius: 3px;
    width: 0%;
    transition: width 0.1s;
}

/* ===== Forms ===== */
.form-card {
    background: var(--white);
    border-radius: var(--border-radius-xl);
    box-shadow: var(--shadow-xl);
    padding: 3rem;
    max-width: 700px;
    margin: 0 auto;
}

.form-header {
    text-align: center;
    margin-bottom: 2.5rem;
}

.form-title {
    font-size: 2.25rem;
    color: var(--dark-color);
    margin-bottom: 0.75rem;
}

.form-subtitle {
    color: var(--gray-600);
    font-size: 1.1rem;
}

.form-group {
    margin-bottom: 1.75rem;
}

.form-label {
    display: block;
    font-weight: 600;
    color: var(--gray-700);
    margin-bottom: 0.5rem;
    font-size: 0.95rem;
}

.form-label .required {
    color: var(--danger-color);
}

.form-control {
    width: 100%;
    padding: 1rem 1.25rem;
    font-size: 1rem;
    line-height: 1.5;
    color: var(--gray-700);
    background-color: var(--white);
    border: 2px solid var(--gray-300);
    border-radius: var(--border-radius);
    transition: var(--transition-base);
}

.form-control:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 0.2rem rgba(102, 126, 234, 0.25);
}

.form-select {
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='%23495057'%3E%3Cpath d='M7 10l5 5 5-5z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 1rem center;
    background-size: 1.5rem;
    padding-right: 3rem;
}

.form-checkbox-group {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
}

.form-checkbox {
    display: flex;
    align-items: center;
    cursor: pointer;
}

.form-checkbox input[type="checkbox"] {
    width: 1.25rem;
    height: 1.25rem;
    margin-right: 0.5rem;
    cursor: pointer;
}

.form-checkbox label {
    cursor: pointer;
    user-select: none;
}

.form-textarea {
    min-height: 120px;
    resize: vertical;
}

/* ===== Buttons ===== */
.btn {
    display: inline-block;
    font-weight: 600;
    text-align: center;
    white-space: nowrap;
    vertical-align: middle;
    user-select: none;
    border: 2px solid transparent;
    padding: 0.75rem 2rem;
    font-size: 1rem;
    line-height: 1.5;
    border-radius: var(--border-radius);
    transition: var(--transition-base);
    cursor: pointer;
}

.btn-primary {
    color: var(--white);
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    border-color: transparent;
    box-shadow: var(--shadow-md);
}

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

.btn-secondary {
    color: var(--gray-700);
    background-color: var(--white);
    border-color: var(--gray-300);
}

.btn-secondary:hover {
    background-color: var(--gray-100);
    border-color: var(--gray-400);
}

.btn-lg {
    padding: 1rem 2.5rem;
    font-size: 1.125rem;
}

.btn-block {
    display: block;
    width: 100%;
}

/* ===== Dashboard Layout ===== */
.dashboard {
    display: flex;
    min-height: 100vh;
}

.sidebar {
    width: 280px;
    background: var(--gray-100);
    border-right: 1px solid var(--gray-300);
    position: fixed;
    height: 100vh;
    overflow-y: auto;
}

.sidebar-header {
    padding: 2rem 1.5rem;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    color: var(--white);
}

.sidebar-logo {
    font-size: 1.75rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
}

.sidebar-nav {
    padding: 1rem 0;
}

.nav-item {
    display: block;
    padding: 1rem 1.5rem;
    color: var(--gray-700);
    font-weight: 500;
    transition: var(--transition-base);
    position: relative;
}

.nav-item:hover {
    background: var(--white);
    color: var(--primary-color);
}

.nav-item.active {
    background: var(--white);
    color: var(--primary-color);
    border-left: 4px solid var(--primary-color);
}

.nav-item.active::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 4px;
    background: var(--primary-color);
}

.main-content {
    flex: 1;
    margin-left: 280px;
    padding: 2rem;
    background: var(--white);
}

/* ===== Cards ===== */
.card {
    background: var(--white);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-sm);
    overflow: hidden;
    transition: var(--transition-base);
}

.card:hover {
    box-shadow: var(--shadow-md);
}

.card-header {
    padding: 1.5rem;
    background: var(--gray-100);
    border-bottom: 1px solid var(--gray-200);
}

.card-body {
    padding: 1.5rem;
}

.card-footer {
    padding: 1.5rem;
    background: var(--gray-100);
    border-top: 1px solid var(--gray-200);
}

/* ===== Metrics Grid ===== */
.metrics-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.metric-card {
    background: var(--white);
    border-radius: var(--border-radius-lg);
    padding: 2rem;
    text-align: center;
    border: 1px solid var(--gray-200);
    transition: var(--transition-base);
    position: relative;
    overflow: hidden;
}

.metric-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 5px;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
}

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

.metric-value {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

.metric-label {
    color: var(--gray-600);
    font-weight: 500;
    font-size: 1rem;
}

.metric-change {
    font-size: 0.875rem;
    margin-top: 0.5rem;
    font-weight: 600;
}

.metric-change.positive {
    color: var(--success-color);
}

.metric-change.negative {
    color: var(--danger-color);
}

/* ===== Tables ===== */
.table-container {
    background: var(--white);
    border-radius: var(--border-radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    margin: 2rem 0;
}

.table {
    width: 100%;
    border-collapse: collapse;
}

.table th {
    background: var(--gray-100);
    color: var(--gray-800);
    font-weight: 600;
    text-align: left;
    padding: 1.25rem;
    border-bottom: 2px solid var(--gray-200);
}

.table td {
    padding: 1.25rem;
    border-bottom: 1px solid var(--gray-200);
}

.table tr:last-child td {
    border-bottom: none;
}

.table tr:hover {
    background: var(--gray-50);
}

/* ===== Timeline / Roadmap ===== */
.timeline {
    position: relative;
    padding-left: 3rem;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 1.5rem;
    top: 0;
    bottom: 0;
    width: 3px;
    background: linear-gradient(to bottom, var(--primary-color), var(--secondary-color));
}

.timeline-item {
    position: relative;
    margin-bottom: 3rem;
    background: var(--white);
    border-radius: var(--border-radius-lg);
    padding: 2rem;
    box-shadow: var(--shadow-sm);
    transition: var(--transition-base);
}

.timeline-item:hover {
    box-shadow: var(--shadow-md);
}

.timeline-item::before {
    content: '';
    position: absolute;
    left: -2.25rem;
    top: 2rem;
    width: 1.5rem;
    height: 1.5rem;
    border-radius: 50%;
    background: var(--white);
    border: 4px solid var(--primary-color);
}

.timeline-item.completed::before {
    background: var(--success-color);
    border-color: var(--success-color);
}

.timeline-item.in-progress::before {
    background: var(--warning-color);
    border-color: var(--warning-color);
}

.timeline-date {
    display: inline-block;
    background: var(--primary-color);
    color: var(--white);
    padding: 0.5rem 1.25rem;
    border-radius: 2rem;
    font-size: 0.875rem;
    font-weight: 600;
    margin-bottom: 1rem;
}

.timeline-title {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: var(--dark-color);
}

/* ===== Badges ===== */
.badge {
    display: inline-block;
    padding: 0.375rem 0.75rem;
    font-size: 0.875rem;
    font-weight: 600;
    line-height: 1;
    text-align: center;
    white-space: nowrap;
    vertical-align: baseline;
    border-radius: 2rem;
}

.badge-primary {
    color: var(--white);
    background-color: var(--primary-color);
}

.badge-success {
    color: var(--white);
    background-color: var(--success-color);
}

.badge-warning {
    color: var(--dark-color);
    background-color: var(--warning-color);
}

.badge-danger {
    color: var(--white);
    background-color: var(--danger-color);
}

/* ===== Progress Bars ===== */
.progress {
    display: flex;
    height: 1rem;
    overflow: hidden;
    font-size: 0.75rem;
    background-color: var(--gray-200);
    border-radius: 0.5rem;
}

.progress-bar {
    display: flex;
    flex-direction: column;
    justify-content: center;
    overflow: hidden;
    color: var(--white);
    text-align: center;
    white-space: nowrap;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    transition: width 0.6s ease;
}

/* ===== Alerts ===== */
.alert {
    position: relative;
    padding: 1rem 1.5rem;
    margin-bottom: 1rem;
    border: 1px solid transparent;
    border-radius: var(--border-radius);
}

.alert-success {
    color: #155724;
    background-color: #d4edda;
    border-color: #c3e6cb;
}

.alert-warning {
    color: #856404;
    background-color: #fff3cd;
    border-color: #ffeaa7;
}

.alert-danger {
    color: #721c24;
    background-color: #f8d7da;
    border-color: #f5c6cb;
}

.alert-info {
    color: #0c5460;
    background-color: #d1ecf1;
    border-color: #bee5eb;
}

/* ===== Loading States ===== */
.loading {
    display: inline-block;
    width: 2rem;
    height: 2rem;
    border: 3px solid var(--gray-300);
    border-radius: 50%;
    border-top-color: var(--primary-color);
    animation: spin 1s ease-in-out infinite;
}

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

.skeleton {
    background: linear-gradient(90deg, var(--gray-200) 25%, var(--gray-300) 50%, var(--gray-200) 75%);
    background-size: 200% 100%;
    animation: loading 1.5s ease-in-out infinite;
}

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

/* ===== 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 {
        transform: translateX(-100%);
        opacity: 0;
    }
    to {
        transform: translateX(0);
        opacity: 1;
    }
}

.slide-in-right {
    animation: slideInRight 0.5s ease-out;
}

@keyframes slideInRight {
    from {
        transform: translateX(100%);
        opacity: 0;
    }
    to {
        transform: translateX(0);
        opacity: 1;
    }
}

/* ===== Utilities ===== */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.text-primary { color: var(--primary-color); }
.text-secondary { color: var(--secondary-color); }
.text-success { color: var(--success-color); }
.text-danger { color: var(--danger-color); }
.text-warning { color: var(--warning-color); }
.text-info { color: var(--info-color); }
.text-muted { color: var(--gray-600); }

.bg-primary { background-color: var(--primary-color); }
.bg-secondary { background-color: var(--secondary-color); }
.bg-success { background-color: var(--success-color); }
.bg-danger { background-color: var(--danger-color); }
.bg-warning { background-color: var(--warning-color); }
.bg-info { background-color: var(--info-color); }
.bg-light { background-color: var(--light-color); }
.bg-dark { background-color: var(--dark-color); }

.mt-0 { margin-top: 0; }
.mt-1 { margin-top: 0.5rem; }
.mt-2 { margin-top: 1rem; }
.mt-3 { margin-top: 1.5rem; }
.mt-4 { margin-top: 2rem; }
.mt-5 { margin-top: 3rem; }

.mb-0 { margin-bottom: 0; }
.mb-1 { margin-bottom: 0.5rem; }
.mb-2 { margin-bottom: 1rem; }
.mb-3 { margin-bottom: 1.5rem; }
.mb-4 { margin-bottom: 2rem; }
.mb-5 { margin-bottom: 3rem; }

.p-0 { padding: 0; }
.p-1 { padding: 0.5rem; }
.p-2 { padding: 1rem; }
.p-3 { padding: 1.5rem; }
.p-4 { padding: 2rem; }
.p-5 { padding: 3rem; }

.d-none { display: none; }
.d-block { display: block; }
.d-inline-block { display: inline-block; }
.d-flex { display: flex; }
.d-grid { display: grid; }

.justify-content-center { justify-content: center; }
.justify-content-between { justify-content: space-between; }
.align-items-center { align-items: center; }

.w-100 { width: 100%; }
.h-100 { height: 100%; }

/* ===== Responsive Design ===== */
@media (max-width: 1200px) {
    .container {
        max-width: 960px;
    }
}

@media (max-width: 992px) {
    .container {
        max-width: 720px;
    }
    
    .sidebar {
        transform: translateX(-100%);
        transition: transform 0.3s ease;
    }
    
    .sidebar.active {
        transform: translateX(0);
    }
    
    .main-content {
        margin-left: 0;
    }
    
    .metrics-grid {
        grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    }
}

@media (max-width: 768px) {
    .container {
        max-width: 540px;
    }
    
    .hero-logo {
        font-size: 3rem;
    }
    
    .hero-tagline {
        font-size: 1.25rem;
    }
    
    .form-card {
        padding: 2rem;
    }
    
    .metrics-grid {
        grid-template-columns: 1fr;
    }
    
    .table-container {
        overflow-x: auto;
    }
    
    .timeline {
        padding-left: 2rem;
    }
    
    .timeline::before {
        left: 0.75rem;
    }
    
    .timeline-item::before {
        left: -1.5rem;
    }
}

@media (max-width: 576px) {
    .container {
        max-width: 100%;
        padding: 0 1rem;
    }
    
    h1 { font-size: 2rem; }
    h2 { font-size: 1.75rem; }
    h3 { font-size: 1.5rem; }
    
    .hero-logo {
        font-size: 2.5rem;
    }
    
    .btn {
        padding: 0.625rem 1.5rem;
    }
    
    .form-card {
        padding: 1.5rem;
    }
}

/* ===== Print Styles ===== */
@media print {
    .sidebar,
    .audio-player,
    .btn,
    .form-card {
        display: none;
    }
    
    .main-content {
        margin-left: 0;
    }
    
    body {
        font-size: 12pt;
        line-height: 1.5;
    }
    
    .card,
    .table-container {
        box-shadow: none;
        border: 1px solid #ddd;
    }
}