/* ATP Tour Professional Design System
   Marco vs Franco Tennis Tracker
   ================================== */

/* ===========================================
   1. CSS VARIABLES & ROOT CONFIGURATION
   =========================================== */

:root {
    /* ATP Tour Color Palette */
    --atp-navy: #1B365D;
    --atp-navy-dark: #0F2A47;
    --atp-navy-darker: #0A1B2E;
    --atp-blue: #0066CC;
    --atp-blue-light: #3399FF;
    --atp-light-blue: #E8F4FD;
    --atp-red: #FF4757;
    --atp-white: #FFFFFF;
    --atp-gray-100: #F8F9FA;
    --atp-gray-200: #E9ECEF;
    --atp-gray-300: #DEE2E6;
    --atp-gray-600: #6C757D;
    --atp-gray-800: #343A40;
    --atp-yellow: #FFD700;
    --atp-success: #28A745;
    --atp-warning: #FFC107;
    --atp-info: #17A2B8;
    
    /* Gradients */
    --gradient-navy: linear-gradient(135deg, var(--atp-navy) 0%, var(--atp-navy-dark) 100%);
    --gradient-blue: linear-gradient(135deg, var(--atp-blue) 0%, var(--atp-navy) 100%);
    --gradient-hero: linear-gradient(180deg, var(--atp-navy-dark) 0%, var(--atp-navy) 50%, var(--atp-blue) 100%);
    --gradient-success: linear-gradient(135deg, #28A745 0%, #20C997 100%);
    --gradient-warning: linear-gradient(135deg, #FFC107 0%, #FF9800 100%);
    --gradient-danger: linear-gradient(135deg, #FF4757 0%, #DC3545 100%);
    --gradient-glass: linear-gradient(135deg, rgba(255, 255, 255, 0.1) 0%, rgba(255, 255, 255, 0.05) 100%);
    --gradient-dark-overlay: linear-gradient(180deg, rgba(27, 54, 93, 0.95) 0%, rgba(15, 42, 71, 0.98) 100%);
    
    /* Shadows */
    --shadow-light: 0 2px 8px rgba(27, 54, 93, 0.08);
    --shadow-medium: 0 4px 16px rgba(27, 54, 93, 0.12);
    --shadow-hover: 0 8px 24px rgba(27, 54, 93, 0.15);
    --shadow-glass: 0 8px 32px 0 rgba(31, 38, 135, 0.37);
    --shadow-deep: 0 20px 40px rgba(27, 54, 93, 0.25);
    --shadow-elevated: 0 12px 28px rgba(27, 54, 93, 0.22);
    --shadow-inset: inset 0 2px 4px rgba(0, 0, 0, 0.06);
    
    /* Border Radius */
    --border-radius-sm: 4px;
    --border-radius: 8px;
    --border-radius-lg: 12px;
    --border-radius-xl: 16px;
    --border-radius-xxl: 24px;
    --border-radius-pill: 50px;
    
    /* Transitions */
    --transition-fast: 0.15s ease;
    --transition-base: 0.3s ease;
    --transition-slow: 0.5s ease;
    --transition-bounce: cubic-bezier(0.68, -0.55, 0.265, 1.55);
    
    /* Typography */
    --font-family-base: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-weight-normal: 400;
    --font-weight-medium: 500;
    --font-weight-semibold: 600;
    --font-weight-bold: 700;
    --font-weight-extrabold: 800;
    
    /* Z-Index System */
    --z-index-dropdown: 1000;
    --z-index-sticky: 1020;
    --z-index-fixed: 1030;
    --z-index-modal-backdrop: 1040;
    --z-index-modal: 1050;
    --z-index-popover: 1060;
    --z-index-tooltip: 1070;
}

/* ===========================================
   2. BASE TYPOGRAPHY & RESET
   =========================================== */

* {
    box-sizing: border-box;
}

body {
    font-family: var(--font-family-base);
    background-color: var(--atp-gray-100);
    color: var(--atp-gray-800);
    line-height: 1.6;
    font-weight: var(--font-weight-normal);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    text-rendering: optimizeLegibility;
}

/* Typography System */
h1, h2, h3, h4, h5, h6 {
    font-weight: var(--font-weight-bold);
    color: var(--atp-navy);
    line-height: 1.2;
    margin-bottom: 1rem;
    letter-spacing: -0.02em;
}

h1, .h1 { 
    font-size: clamp(2rem, 4vw, 3rem);
    font-weight: var(--font-weight-extrabold);
    letter-spacing: -0.03em;
}

h2, .h2 { 
    font-size: clamp(1.75rem, 3.5vw, 2.5rem);
    font-weight: var(--font-weight-bold);
    letter-spacing: -0.025em;
}

h3, .h3 { 
    font-size: clamp(1.5rem, 3vw, 2rem);
    font-weight: var(--font-weight-bold);
}

h4, .h4 { 
    font-size: clamp(1.25rem, 2.5vw, 1.75rem);
    font-weight: var(--font-weight-semibold);
}

h5, .h5 { 
    font-size: clamp(1.125rem, 2vw, 1.5rem);
    font-weight: var(--font-weight-semibold);
}

h6, .h6 { 
    font-size: clamp(1rem, 1.5vw, 1.25rem);
    font-weight: var(--font-weight-semibold);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.lead {
    font-size: 1.25rem;
    font-weight: var(--font-weight-normal);
    line-height: 1.7;
}

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

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

/* ===========================================
   3. NAVIGATION & HEADER
   =========================================== */

/* Sticky Navigation with Glass Effect */
.navbar {
    transition: all var(--transition-base);
    box-shadow: 0 2px 20px rgba(27, 54, 93, 0.1);
    position: sticky;
    top: 0;
    z-index: var(--z-index-sticky);
    backdrop-filter: blur(10px);
    background: rgba(27, 54, 93, 0.95) !important;
}

.navbar-scrolled {
    box-shadow: var(--shadow-elevated);
    background: rgba(27, 54, 93, 0.98) !important;
}

.navbar-brand {
    font-weight: var(--font-weight-extrabold);
    font-size: 1.5rem;
    letter-spacing: -0.02em;
    transition: transform var(--transition-fast);
}

.navbar-brand:hover {
    transform: scale(1.05);
}

.navbar-nav .nav-link {
    font-weight: var(--font-weight-medium);
    transition: all var(--transition-base);
    color: rgba(255, 255, 255, 0.85) !important;
    padding: 0.75rem 1rem !important;
    border-radius: var(--border-radius);
    margin: 0 0.25rem;
    position: relative;
}

.navbar-nav .nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    width: 0;
    height: 2px;
    background: var(--atp-blue-light);
    transform: translateX(-50%);
    transition: width var(--transition-base);
}

.navbar-nav .nav-link:hover {
    color: var(--atp-white) !important;
    background-color: rgba(255, 255, 255, 0.1);
    transform: translateY(0px);
}

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

.navbar-nav .nav-link.active {
    color: var(--atp-white) !important;
    font-weight: var(--font-weight-bold);
    background-color: rgba(255, 255, 255, 0.2);
}

/* Section Headers with Animated Underlines */
.section-header-animated {
    position: relative;
    display: inline-block;
    padding-bottom: 0.75rem;
    margin-bottom: 1rem;
}

.section-header-animated::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    width: 60%;
    height: 3px;
    background: linear-gradient(90deg, var(--atp-blue) 0%, var(--atp-blue-light) 100%);
    transform: translateX(-50%);
    transition: all var(--transition-base);
    border-radius: 2px;
    opacity: 0.8;
}

/* Hover effect removed per user request */

/* ===========================================
   4. HERO SECTIONS
   =========================================== */

.hero-section {
    background: var(--gradient-hero);
    color: var(--atp-white);
    padding: 5rem 0;
    position: relative;
    overflow: hidden;
    min-height: 400px;
}

.hero-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: 
        radial-gradient(circle at 20% 50%, rgba(0, 102, 204, 0.2) 0%, transparent 50%),
        radial-gradient(circle at 80% 80%, rgba(255, 255, 255, 0.05) 0%, transparent 50%),
        radial-gradient(circle at 50% 20%, rgba(0, 102, 204, 0.1) 0%, transparent 40%);
    pointer-events: none;
}

.hero-section::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 100px;
    background: linear-gradient(to top, var(--atp-gray-100), transparent);
}

.hero-section h1 {
    color: var(--atp-white);
    font-weight: var(--font-weight-extrabold);
    text-shadow: 2px 2px 8px rgba(0, 0, 0, 0.3);
    position: relative;
    z-index: 1;
}

.hero-section p {
    color: rgba(255, 255, 255, 0.9);
    font-size: 1.25rem;
    position: relative;
    z-index: 1;
}

/* ===========================================
   5. CARD COMPONENTS
   =========================================== */

.card {
    border: none;
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-light);
    transition: all var(--transition-base);
    background: var(--atp-white);
    overflow: hidden;
}

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

.card-header {
    border-radius: 0 !important;
    border-bottom: 2px solid var(--atp-gray-200);
    font-weight: var(--font-weight-bold);
    font-size: 0.875rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    padding: 1rem 1.5rem;
    background-color: var(--atp-white) !important;
    color: var(--atp-navy) !important;
}

/* Gradient Header Cards */
.card-gradient-header .card-header {
    background: var(--gradient-navy) !important;
    color: var(--atp-white) !important;
    border-bottom: none;
    padding: 1.5rem;
    position: relative;
}

.card-gradient-header .card-header::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: radial-gradient(circle at top right, rgba(255, 255, 255, 0.1) 0%, transparent 50%);
    pointer-events: none;
}

/* Glass Effect Cards */
.card-glass {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.3);
    box-shadow: var(--shadow-glass);
}

.card-glass:hover {
    background: rgba(255, 255, 255, 0.98);
    transform: translateY(-6px);
}

/* Elevated Cards */
.card-elevated {
    box-shadow: var(--shadow-medium);
}

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

/* Score Cards */
.score-card {
    background: var(--gradient-blue);
    color: white;
    border-radius: var(--border-radius-lg);
    padding: 2rem;
    margin-bottom: 1.5rem;
    position: relative;
    overflow: hidden;
}

.score-card::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(255, 255, 255, 0.1) 0%, transparent 30%);
    animation: rotate 30s linear infinite;
}

@keyframes rotate {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* ===========================================
   6. BUTTONS & INTERACTIONS
   =========================================== */

.btn {
    border-radius: var(--border-radius);
    font-weight: var(--font-weight-semibold);
    transition: all var(--transition-base);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    padding: 0.75rem 1.5rem;
    font-size: 0.875rem;
    position: relative;
    overflow: hidden;
}

.btn-atp {
    background: var(--gradient-blue);
    border: none;
    color: white;
    box-shadow: var(--shadow-light);
}

.btn-atp::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.3), transparent);
    transition: left 0.5s ease;
}

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

.btn-atp:hover::before {
    left: 100%;
}

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

.btn-outline-atp:hover {
    background: var(--atp-blue);
    border-color: var(--atp-blue);
    color: white;
    transform: translateY(-2px);
    box-shadow: var(--shadow-medium);
}

.btn-glass {
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    color: var(--atp-white);
}

.btn-glass:hover {
    background: rgba(255, 255, 255, 0.2);
    transform: translateY(-2px);
}

/* ===========================================
   7. BADGES & PILLS
   =========================================== */

.badge {
    font-weight: var(--font-weight-semibold);
    padding: 0.5em 1em;
    border-radius: var(--border-radius-pill);
    font-size: 0.75rem;
    letter-spacing: 0.025em;
    text-transform: uppercase;
}

.badge-gradient-navy {
    background: var(--gradient-navy);
    color: var(--atp-white);
}

.badge-gradient-blue {
    background: var(--gradient-blue);
    color: var(--atp-white);
}

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

.badge-gradient-warning {
    background: var(--gradient-warning);
    color: var(--atp-gray-800);
}

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

/* ===========================================
   8. TABS & NAVIGATION PILLS
   =========================================== */

/* Pill-style Tabs */
.nav-pills .nav-link {
    border-radius: var(--border-radius-pill);
    padding: 0.75rem 1.5rem;
    font-weight: var(--font-weight-semibold);
    font-size: 0.875rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--atp-gray-600);
    background: transparent;
    transition: all var(--transition-base);
    margin: 0 0.25rem;
}

.nav-pills .nav-link:hover {
    background: var(--atp-gray-100);
    color: var(--atp-navy);
    transform: translateY(-2px);
}

.nav-pills .nav-link.active {
    background: var(--gradient-blue);
    color: var(--atp-white);
    box-shadow: var(--shadow-medium);
}

/* ATP Style Tabs */
.nav-tabs-atp {
    border-bottom: 2px solid var(--atp-gray-200);
    margin-bottom: 2rem;
}

.nav-tabs-atp .nav-link {
    border: none;
    border-radius: 0;
    padding: 1rem 1.5rem;
    font-weight: var(--font-weight-semibold);
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--atp-gray-600);
    background: transparent;
    transition: all var(--transition-base);
    position: relative;
    margin: 0 1rem;
}

.nav-tabs-atp .nav-link::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--gradient-blue);
    transform: scaleX(0);
    transition: transform var(--transition-base);
}

.nav-tabs-atp .nav-link:hover {
    color: var(--atp-navy);
}

.nav-tabs-atp .nav-link.active {
    color: var(--atp-navy);
    background: transparent;
}

.nav-tabs-atp .nav-link.active::after {
    transform: scaleX(1);
}

/* ===========================================
   9. STAT COMPONENTS
   =========================================== */

/* Quick Stats Chips */
.stat-chip {
    display: inline-flex;
    align-items: center;
    padding: 0.5rem 1rem;
    background: var(--gradient-glass);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: var(--border-radius-pill);
    font-weight: var(--font-weight-semibold);
    font-size: 0.875rem;
    transition: all var(--transition-fast);
    box-shadow: var(--shadow-light);
}

.stat-chip:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-medium);
}

.stat-chip-value {
    font-weight: var(--font-weight-bold);
    font-size: 1.125rem;
    margin-right: 0.5rem;
    color: var(--atp-navy);
}

.stat-chip-label {
    color: var(--atp-gray-600);
    text-transform: uppercase;
    font-size: 0.75rem;
    letter-spacing: 0.05em;
}

/* Stat Cards */
.stat-card {
    background: var(--atp-white);
    border-radius: var(--border-radius-lg);
    padding: 1.5rem;
    box-shadow: var(--shadow-light);
    transition: all var(--transition-base);
    position: relative;
    overflow: hidden;
}

.stat-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 4px;
    height: 100%;
    background: var(--gradient-blue);
}

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

.stat-card-icon {
    width: 48px;
    height: 48px;
    border-radius: var(--border-radius);
    background: var(--gradient-glass);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1rem;
    font-size: 1.5rem;
    color: var(--atp-blue);
}

.stat-card-value {
    font-size: 2rem;
    font-weight: var(--font-weight-extrabold);
    color: var(--atp-navy);
    margin-bottom: 0.25rem;
}

.stat-card-label {
    font-size: 0.875rem;
    color: var(--atp-gray-600);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    font-weight: var(--font-weight-semibold);
}

.stat-card-change {
    display: inline-flex;
    align-items: center;
    padding: 0.25rem 0.75rem;
    border-radius: var(--border-radius-pill);
    font-size: 0.75rem;
    font-weight: var(--font-weight-semibold);
    margin-top: 0.5rem;
}

.stat-card-change.positive {
    background: rgba(40, 167, 69, 0.1);
    color: var(--atp-success);
}

.stat-card-change.negative {
    background: rgba(255, 71, 87, 0.1);
    color: var(--atp-red);
}

/* ===========================================
   10. CHARTS & DATA VISUALIZATION
   =========================================== */

.chart-container {
    position: relative;
    height: 350px;
    width: 100%;
    padding: 1.5rem;
    background: var(--atp-white);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-light);
    margin-bottom: 2rem;
}

.chart-container-lg {
    height: 450px;
}

.chart-container-sm {
    height: 250px;
}

.chart-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
    padding-bottom: 1rem;
    border-bottom: 2px solid var(--atp-gray-200);
}

.chart-title {
    font-size: 1.125rem;
    font-weight: var(--font-weight-bold);
    color: var(--atp-navy);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.chart-legend {
    display: flex;
    gap: 1.5rem;
}

.chart-legend-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.875rem;
    color: var(--atp-gray-600);
}

.chart-legend-dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: var(--gradient-blue);
}

/* ===========================================
   11. GRID & LAYOUT SYSTEMS
   =========================================== */

.data-grid {
    display: grid;
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.data-grid-2 {
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
}

.data-grid-3 {
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
}

.data-grid-4 {
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
}

/* Section Headers */
.section-header {
    background: var(--gradient-navy);
    color: var(--atp-white);
    padding: 2rem 0;
    margin-bottom: 2rem;
    border-radius: var(--border-radius-lg);
    position: relative;
    overflow: hidden;
}

.section-header::before {
    content: '';
    position: absolute;
    top: 0;
    right: 0;
    width: 300px;
    height: 300px;
    background: radial-gradient(circle, rgba(255, 255, 255, 0.1) 0%, transparent 70%);
    transform: translate(50%, -50%);
}

.section-header h2 {
    color: var(--atp-white);
    margin-bottom: 0.5rem;
    position: relative;
}

.section-header p {
    color: rgba(255, 255, 255, 0.8);
    margin-bottom: 0;
    position: relative;
}

/* ===========================================
   12. FORMS & INPUTS
   =========================================== */

.form-control,
.form-select {
    border: 2px solid var(--atp-gray-300);
    border-radius: var(--border-radius);
    padding: 0.75rem 1rem;
    font-size: 1rem;
    transition: all var(--transition-base);
}

.form-control:focus,
.form-select:focus {
    border-color: var(--atp-blue);
    box-shadow: 0 0 0 0.2rem rgba(0, 102, 204, 0.15);
    outline: none;
}

.form-label {
    font-weight: var(--font-weight-semibold);
    color: var(--atp-navy);
    margin-bottom: 0.5rem;
    font-size: 0.875rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.form-floating .form-control {
    padding: 1.25rem 0.75rem 0.5rem;
}

.form-floating label {
    padding: 0.75rem;
}

/* ===========================================
   13. TABLES & LISTS
   =========================================== */

.table {
    border-collapse: separate;
    border-spacing: 0;
}

.table thead th {
    background: var(--gradient-navy);
    color: var(--atp-white);
    font-weight: var(--font-weight-semibold);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    font-size: 0.875rem;
    padding: 1rem;
    border: none;
}

.table tbody tr {
    transition: all var(--transition-base);
}

.table tbody tr:hover {
    background-color: var(--atp-light-blue);
    transform: translateX(4px);
}

.list-group-item {
    border: none;
    border-bottom: 1px solid var(--atp-gray-200);
    padding: 1.25rem;
    transition: all var(--transition-base);
    background: var(--atp-white);
}

.list-group-item:hover {
    background-color: var(--atp-light-blue);
    padding-left: 1.5rem;
}

.list-group-item.active {
    background: var(--gradient-blue);
    border-color: transparent;
    color: var(--atp-white);
}

/* ===========================================
   14. UTILITY CLASSES
   =========================================== */

/* Background Utilities */
.bg-gradient-navy {
    background: var(--gradient-navy) !important;
}

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

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

/* Effect Utilities */
.backdrop-blur {
    backdrop-filter: blur(10px);
}

.glass-effect {
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
}

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

.shadow-text {
    text-shadow: 2px 2px 8px rgba(0, 0, 0, 0.1);
}

/* Animation Utilities */
.hover-lift {
    transition: transform var(--transition-base);
}

.hover-lift:hover {
    transform: translateY(-4px);
}

.hover-scale {
    transition: transform var(--transition-base);
}

.hover-scale:hover {
    transform: scale(1.05);
}

.hover-shadow {
    transition: box-shadow var(--transition-base);
}

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

/* Loading States */
.skeleton {
    background: linear-gradient(90deg, #f0f0f0 25%, #e0e0e0 50%, #f0f0f0 75%);
    background-size: 200% 100%;
    animation: loading 1.5s infinite;
}

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

.spinner-border-atp {
    color: var(--atp-blue);
}

/* Dividers */
.divider {
    height: 2px;
    background: var(--gradient-blue);
    margin: 2rem 0;
    border-radius: var(--border-radius-pill);
}

.divider-light {
    background: var(--atp-gray-200);
}

.divider-vertical {
    width: 2px;
    height: 100%;
    background: var(--gradient-blue);
    margin: 0 1rem;
}

/* ===========================================
   15. ANIMATIONS
   =========================================== */

@keyframes fadeIn {
    from { 
        opacity: 0; 
        transform: translateY(20px); 
    }
    to { 
        opacity: 1; 
        transform: translateY(0); 
    }
}

@keyframes slideIn {
    from { 
        transform: translateX(-20px); 
        opacity: 0; 
    }
    to { 
        transform: translateX(0); 
        opacity: 1; 
    }
}

@keyframes scaleIn {
    from { 
        transform: scale(0.9); 
        opacity: 0; 
    }
    to { 
        transform: scale(1); 
        opacity: 1; 
    }
}

@keyframes pulse {
    0% { 
        box-shadow: 0 0 0 0 rgba(0, 102, 204, 0.7); 
    }
    70% { 
        box-shadow: 0 0 0 10px rgba(0, 102, 204, 0); 
    }
    100% { 
        box-shadow: 0 0 0 0 rgba(0, 102, 204, 0); 
    }
}

@keyframes bounce {
    0%, 20%, 50%, 80%, 100% {
        transform: translateY(0);
    }
    40% {
        transform: translateY(-10px);
    }
    60% {
        transform: translateY(-5px);
    }
}

.fade-in {
    animation: fadeIn 0.5s ease-in;
}

.slide-in {
    animation: slideIn 0.3s ease-out;
}

.scale-in {
    animation: scaleIn 0.3s ease-out;
}

.pulse {
    animation: pulse 2s infinite;
}

.bounce {
    animation: bounce 2s infinite;
}

/* ===========================================
   16. RESPONSIVE DESIGN
   =========================================== */

/* Tablet and below */
@media (max-width: 768px) {
    /* Typography adjustments */
    h1, .h1 { font-size: 2rem; }
    h2, .h2 { font-size: 1.75rem; }
    h3, .h3 { font-size: 1.5rem; }
    h4, .h4 { font-size: 1.25rem; }
    
    /* Enhanced navigation for tablet */
    .navbar {
        padding: 0.75rem 0;
    }
    
    .navbar-nav .nav-link {
        padding: 0.6rem 0.9rem !important;
        margin: 0.2rem;
        border-radius: 6px;
        transition: all var(--transition-base);
    }
    
    .navbar-nav .nav-link:hover {
        background-color: rgba(255, 255, 255, 0.15);
        transform: translateY(-1px);
    }
    
    /* Card adjustments */
    .card-body {
        padding: 1rem;
    }
    
    /* Container adjustments */
    .container {
        padding-left: 1rem;
        padding-right: 1rem;
    }
    
    /* Hero section adjustments */
    .hero-section {
        padding: 3rem 0;
        min-height: 300px;
    }
    
    /* Button adjustments */
    .btn {
        padding: 0.5rem 1rem;
        font-size: 0.85rem;
    }
    
    /* Stat card adjustments */
    .stat-card {
        padding: 1rem;
    }
    
    .stat-card-value {
        font-size: 1.5rem;
    }
    
    /* Chart container adjustments */
    .chart-container {
        height: 280px;
        padding: 1rem;
    }
    
    /* Grid adjustments */
    .data-grid-2,
    .data-grid-3,
    .data-grid-4 {
        grid-template-columns: 1fr;
    }
    
    /* Sticky navigation enhancements */
    .sticky-subnav {
        padding: 0.5rem 0;
    }
    
    .sticky-subnav .btn {
        font-size: 0.8rem;
        padding: 0.375rem 0.75rem;
        margin: 0.1rem;
    }
    
    /* Table responsive improvements */
    .table th,
    .table td {
        padding: 0.5rem;
        font-size: 0.9rem;
    }
}

/* Mobile devices */
@media (max-width: 576px) {
    /* Typography adjustments */
    h1, .h1 { font-size: 1.75rem; }
    h2, .h2 { font-size: 1.5rem; }
    h3, .h3 { font-size: 1.25rem; }
    h4, .h4 { font-size: 1.125rem; }
    
    /* Container adjustments */
    .container {
        padding-left: 0.75rem;
        padding-right: 0.75rem;
    }
    
    /* Card adjustments */
    .card-body {
        padding: 0.75rem;
    }
    
    /* Hero section adjustments */
    .hero-section {
        padding: 2rem 0;
        min-height: 250px;
    }
    
    .hero-section h1 {
        font-size: 1.5rem;
    }
    
    .hero-section p {
        font-size: 1rem;
    }
    
    /* Enhanced navbar for mobile */
    .navbar {
        padding: 0.5rem 0;
    }
    
    .navbar-brand {
        font-size: 1rem;
        line-height: 1.2;
    }
    
    .navbar-brand small {
        font-size: 0.5rem !important;
        margin-top: -2px !important;
    }
    
    .navbar-toggler {
        padding: 0.25rem 0.5rem;
        font-size: 1rem;
        border: 1px solid rgba(255, 255, 255, 0.3) !important;
        border-radius: 8px;
    }
    
    .navbar-toggler:focus {
        box-shadow: 0 0 0 0.2rem rgba(0, 102, 204, 0.25);
    }
    
    .navbar-nav .nav-link {
        padding: 0.75rem 1rem !important;
        margin: 0.25rem 0;
        text-align: center;
        border-radius: 8px;
        background-color: rgba(255, 255, 255, 0.05);
        border: 1px solid rgba(255, 255, 255, 0.1);
    }
    
    .navbar-nav .nav-link.active {
        background-color: rgba(0, 102, 204, 0.3) !important;
        border-color: var(--atp-blue-light);
    }
    
    .navbar-collapse {
        margin-top: 1rem;
        padding-top: 1rem;
        border-top: 1px solid rgba(255, 255, 255, 0.1);
    }
    
    /* Stat chips */
    .stat-chip {
        padding: 0.375rem 0.75rem;
        font-size: 0.75rem;
    }
    
    .stat-chip-value {
        font-size: 1rem;
    }
    
    /* Enhanced section headers for mobile */
    .section-header {
        padding: 1.5rem 0;
    }
    
    .section-header-animated {
        font-size: 1.1rem;
        padding-bottom: 0.5rem;
        margin-bottom: 1.5rem;
    }
    
    .section-header-animated::after {
        height: 2px;
        width: 50%;
    }
    
    /* Mobile hover effect removed per user request */
    
    /* Mobile-specific optimizations */
    .table-responsive {
        font-size: 0.8rem;
    }
    
    .btn-group-sm > .btn {
        padding: 0.25rem 0.5rem;
        font-size: 0.7rem;
    }
    
    .card-header h5 {
        font-size: 0.9rem;
    }
    
    .badge {
        font-size: 0.65rem;
        padding: 0.25rem 0.5rem;
    }
    
    /* Quick stats chips mobile optimization */
    .timeframe-filter .btn {
        padding: 0.375rem 0.5rem;
        font-size: 0.7rem;
        margin: 0.1rem;
    }
    
    /* Comment form mobile optimization */
    .input-group-sm .form-control {
        font-size: 0.8rem;
    }
    
    /* Chart loading placeholders */
    .loading-placeholder {
        padding: 2rem 1rem;
    }
    
    .spinner-border {
        width: 2rem;
        height: 2rem;
    }
}

/* Print styles */
@media print {
    .navbar,
    .btn,
    .hero-section::before,
    .hero-section::after {
        display: none !important;
    }
    
    .card {
        box-shadow: none !important;
        page-break-inside: avoid;
    }
    
    body {
        color: #000;
        background: #fff;
    }
}

/* ===========================================
   17. ACCESSIBILITY
   =========================================== */

/* Focus styles */
*:focus-visible {
    outline: 2px solid var(--atp-blue);
    outline-offset: 2px;
}

/* Skip to content link */
.skip-to-content {
    position: absolute;
    left: -9999px;
    z-index: 999;
    padding: 1rem;
    background: var(--atp-navy);
    color: var(--atp-white);
    text-decoration: none;
}

.skip-to-content:focus {
    left: 50%;
    transform: translateX(-50%);
    top: 1rem;
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* High contrast mode */
@media (prefers-contrast: high) {
    .card {
        border: 2px solid var(--atp-navy);
    }
    
    .btn {
        border: 2px solid currentColor;
    }
}