/* Modern DBU-inspired design system */

:root {
    /* DBU Colors */
    --primary-red: #D41212;
    --primary-dark: #A30E0E;
    --primary-light: #E85454;
    --white: #FFFFFF;
    --off-white: #F8F9FA;
    --gray-light: #E9ECEF;
    --gray-medium: #6C757D;
    --gray-dark: #343A40;
    --black: #000000;

    /* Semantic colors */
    --success: #28A745;
    --warning: #FFC107;
    --danger: #DC3545;
    --info: #17A2B8;

    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-xxl: 3rem;

    /* Border radius */
    --radius-sm: 0.25rem;
    --radius-md: 0.5rem;
    --radius-lg: 1rem;
    --radius-xl: 1.5rem;
    --radius-full: 50%;

    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px rgba(0, 0, 0, 0.1);

    /* Typography */
    --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    --font-mono: "SF Mono", Monaco, "Cascadia Code", "Roboto Mono", monospace;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    overflow-x: hidden;
    width: 100%;
}

body {
    font-family: var(--font-sans);
    color: var(--gray-dark);
    background-color: var(--off-white);
    line-height: 1.6;
    overflow-x: hidden;
    width: 100%;
    min-width: 320px; /* Minimum width for very small devices */
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: var(--spacing-md);
    color: var(--gray-dark);
}

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; }

/* Container */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
    width: 100%;
}

/* Prevent horizontal scroll on mobile */
@media (max-width: 768px) {
    .container {
        padding: 0 var(--spacing-md);
        max-width: 100%;
    }
}

/* Modern Card Component */
.card {
    background: var(--white);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    padding: var(--spacing-xl);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    overflow: hidden;
}

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

.card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 4px;
    height: 100%;
    background: var(--primary-red);
    transform: scaleY(0);
    transition: transform 0.3s ease;
}

.card:hover::before {
    transform: scaleY(1);
}

/* Hero Section - Ultra Modern 2025 Design */
.hero {
    position: relative;
    background: linear-gradient(135deg, var(--primary-red) 0%, var(--primary-dark) 100%);
    color: var(--white);
    padding: calc(var(--spacing-xxl) * 1.5) 0;
    overflow: hidden;
    min-height: 500px;
}

/* Animated gradient mesh background */
.hero::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle at 20% 80%, transparent 50%, rgba(255,255,255,0.1) 51%, transparent 52%),
                radial-gradient(circle at 80% 20%, transparent 50%, rgba(255,255,255,0.1) 51%, transparent 52%),
                radial-gradient(circle at 40% 40%, transparent 50%, rgba(255,255,255,0.08) 51%, transparent 52%),
                radial-gradient(circle at 90% 90%, transparent 50%, rgba(255,255,255,0.08) 51%, transparent 52%);
    animation: mesh-rotation 25s linear infinite;
    pointer-events: none;
}

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

/* Glassmorphism overlay cards */
.hero-glass-cards {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    pointer-events: none;
}

.glass-card {
    position: absolute;
    background: rgba(255, 255, 255, 0.03);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 20px;
}

.glass-card:nth-child(1) {
    width: 200px;
    height: 200px;
    top: 10%;
    left: 5%;
    animation: float-rotate 20s ease-in-out infinite;
}

.glass-card:nth-child(2) {
    width: 150px;
    height: 150px;
    top: 60%;
    right: 10%;
    animation: float-rotate 25s ease-in-out infinite reverse;
    animation-delay: -5s;
}

.glass-card:nth-child(3) {
    width: 180px;
    height: 180px;
    bottom: 20%;
    left: 15%;
    animation: float-rotate 22s ease-in-out infinite;
    animation-delay: -10s;
}

@keyframes float-rotate {
    0%, 100% {
        transform: translateY(0) rotate(0deg) scale(1);
    }
    25% {
        transform: translateY(-20px) rotate(90deg) scale(1.05);
    }
    50% {
        transform: translateY(10px) rotate(180deg) scale(0.95);
    }
    75% {
        transform: translateY(-10px) rotate(270deg) scale(1.02);
    }
}

/* Animated text gradient */
.hero-title {
    font-size: clamp(2.5rem, 5vw, 4rem);
    font-weight: 900;
    background: linear-gradient(90deg,
        var(--white) 0%,
        rgba(255,255,255,0.8) 50%,
        var(--white) 100%);
    background-size: 200% auto;
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    animation: text-shimmer 3s linear infinite;
    margin-bottom: var(--spacing-lg);
}

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

/* Liquid morphing blob */
.hero-blob {
    position: absolute;
    top: 50%;
    right: -10%;
    width: 400px;
    height: 400px;
    opacity: 0.1;
    pointer-events: none;
}

.blob-shape {
    width: 100%;
    height: 100%;
    background: linear-gradient(45deg, var(--white), transparent);
    border-radius: 42% 58% 70% 30% / 45% 45% 55% 55%;
    animation: morph 15s ease-in-out infinite;
    transform-origin: center;
}

@keyframes morph {
    0%, 100% {
        border-radius: 42% 58% 70% 30% / 45% 45% 55% 55%;
        transform: rotate(0deg) scale(1);
    }
    25% {
        border-radius: 70% 30% 46% 54% / 30% 29% 71% 70%;
        transform: rotate(90deg) scale(1.1);
    }
    50% {
        border-radius: 30% 70% 70% 30% / 30% 52% 48% 70%;
        transform: rotate(180deg) scale(0.9);
    }
    75% {
        border-radius: 50% 50% 33% 67% / 55% 27% 73% 45%;
        transform: rotate(270deg) scale(1.05);
    }
}

/* Particle field effect */
.hero-particles {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    pointer-events: none;
}

.particle {
    position: absolute;
    width: 2px;
    height: 2px;
    background: rgba(255,255,255,0.5);
    border-radius: 50%;
}

@for $i from 1 through 20 {
    .particle:nth-child(#{$i}) {
        left: #{random(100)}%;
        top: #{random(100)}%;
        animation: particle-float #{15 + random(10)}s linear infinite;
        animation-delay: #{random(5)}s;
    }
}

/* CSS version without SASS */
.particle:nth-child(1) { left: 5%; top: 20%; animation: particle-float 18s linear infinite; }
.particle:nth-child(2) { left: 15%; top: 80%; animation: particle-float 22s linear infinite; animation-delay: 1s; }
.particle:nth-child(3) { left: 25%; top: 50%; animation: particle-float 20s linear infinite; animation-delay: 2s; }
.particle:nth-child(4) { left: 35%; top: 30%; animation: particle-float 25s linear infinite; animation-delay: 0.5s; }
.particle:nth-child(5) { left: 45%; top: 70%; animation: particle-float 19s linear infinite; animation-delay: 3s; }
.particle:nth-child(6) { left: 55%; top: 40%; animation: particle-float 23s linear infinite; animation-delay: 1.5s; }
.particle:nth-child(7) { left: 65%; top: 60%; animation: particle-float 21s linear infinite; animation-delay: 4s; }
.particle:nth-child(8) { left: 75%; top: 25%; animation: particle-float 24s linear infinite; animation-delay: 2.5s; }
.particle:nth-child(9) { left: 85%; top: 75%; animation: particle-float 20s linear infinite; animation-delay: 0s; }
.particle:nth-child(10) { left: 95%; top: 45%; animation: particle-float 22s linear infinite; animation-delay: 3.5s; }

@keyframes particle-float {
    0% {
        transform: translateY(100vh) translateX(0);
        opacity: 0;
    }
    10% {
        opacity: 1;
    }
    90% {
        opacity: 1;
    }
    100% {
        transform: translateY(-100vh) translateX(100px);
        opacity: 0;
    }
}

/* Gradient border animation on buttons */
.btn-primary {
    position: relative;
    background: var(--primary-red);
    color: var(--white);
    overflow: hidden;
    z-index: 1;
}

.btn-primary::before {
    content: '';
    position: absolute;
    top: -2px;
    left: -2px;
    right: -2px;
    bottom: -2px;
    background: linear-gradient(45deg,
        var(--primary-light),
        var(--white),
        var(--primary-light),
        var(--primary-red));
    background-size: 400%;
    border-radius: var(--radius-md);
    opacity: 0;
    z-index: -1;
    transition: opacity 0.3s;
    animation: gradient-border 3s linear infinite;
}

.btn-primary:hover::before {
    opacity: 1;
}

@keyframes gradient-border {
    0% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
    100% { background-position: 0% 50%; }
}

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

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-sm) var(--spacing-lg);
    border: none;
    border-radius: var(--radius-md);
    font-weight: 600;
    font-size: 1rem;
    cursor: pointer;
    transition: all 0.3s ease;
    text-decoration: none;
    gap: var(--spacing-sm);
}

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

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

.btn-secondary {
    background: var(--white);
    color: var(--primary-red);
    border: 2px solid var(--primary-red);
}

.btn-secondary:hover {
    background: var(--primary-red);
    color: var(--white);
}

.btn-large {
    padding: var(--spacing-md) var(--spacing-xl);
    font-size: 1.125rem;
}

/* Navigation */
.navbar {
    background: var(--white);
    box-shadow: var(--shadow-md);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.navbar-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-md) 0;
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-red);
    text-decoration: none;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: var(--spacing-xl);
}

.nav-link {
    color: var(--gray-dark);
    text-decoration: none;
    font-weight: 500;
    position: relative;
    transition: color 0.3s ease;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--primary-red);
    transition: width 0.3s ease;
}

.nav-link:hover,
.nav-link.active {
    color: var(--primary-red);
}

.nav-link:hover::after,
.nav-link.active::after {
    width: 100%;
}

/* Grid System */
.grid {
    display: grid;
    gap: var(--spacing-xl);
}

.grid-cols-1 { grid-template-columns: repeat(1, 1fr); }
.grid-cols-2 { grid-template-columns: repeat(2, 1fr); }
.grid-cols-3 { grid-template-columns: repeat(3, 1fr); }
.grid-cols-4 { grid-template-columns: repeat(4, 1fr); }

/* Responsive Grid Adjustments */
@media (max-width: 1024px) {
    .grid-cols-4 {
        grid-template-columns: repeat(2, 1fr);
    }

    .grid {
        gap: var(--spacing-lg);
    }
}

@media (max-width: 768px) {
    .grid-cols-2,
    .grid-cols-3,
    .grid-cols-4 {
        grid-template-columns: 1fr;
    }

    .grid {
        gap: var(--spacing-md);
    }

    /* Reduce padding on mobile */
    .container {
        padding: 0 var(--spacing-md);
    }

    /* Adjust typography for mobile */
    h1 { font-size: 2rem; }
    h2 { font-size: 1.5rem; }
    h3 { font-size: 1.25rem; }
    h4 { font-size: 1.125rem; }

    /* Mobile-optimized cards */
    .card {
        padding: var(--spacing-lg);
        border-radius: var(--radius-md);
    }

    /* Stack nav menu on mobile */
    .nav-menu {
        flex-direction: column;
        gap: var(--spacing-sm);
    }

    /* Mobile buttons */
    .btn {
        width: 100%;
        justify-content: center;
    }

    .btn-large {
        padding: var(--spacing-md) var(--spacing-lg);
    }

    /* Hero adjustments */
    .hero {
        padding: var(--spacing-xl) 0;
        min-height: 300px;
    }

    .hero::after {
        height: 50px;
    }
}

/* Exercise Card */
.exercise-card {
    background: var(--white);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-md);
    transition: all 0.3s ease;
    cursor: pointer;
}

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

.exercise-header {
    background: linear-gradient(135deg, var(--primary-red), var(--primary-dark));
    color: var(--white);
    padding: var(--spacing-md);
}

.exercise-body {
    padding: var(--spacing-lg);
}

.exercise-meta {
    display: flex;
    gap: var(--spacing-lg);
    margin-top: var(--spacing-md);
    flex-wrap: wrap;
}

.meta-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    color: var(--gray-medium);
    font-size: 0.875rem;
}

/* Forms */
.form-group {
    margin-bottom: var(--spacing-lg);
}

.form-label {
    display: block;
    margin-bottom: var(--spacing-sm);
    font-weight: 600;
    color: var(--gray-dark);
}

.form-control {
    width: 100%;
    padding: var(--spacing-sm) var(--spacing-md);
    border: 2px solid var(--gray-light);
    border-radius: var(--radius-md);
    font-size: 1rem;
    transition: all 0.3s ease;
}

.form-control:focus {
    outline: none;
    border-color: var(--primary-red);
    box-shadow: 0 0 0 3px rgba(212, 18, 18, 0.1);
}

/* Badges */
.badge {
    display: inline-flex;
    align-items: center;
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-full);
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
}

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

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

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

/* Loading Animation */
.spinner {
    display: inline-block;
    width: 40px;
    height: 40px;
    border: 4px solid var(--gray-light);
    border-top-color: var(--primary-red);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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

/* Session Timeline */
.timeline {
    position: relative;
    padding-left: var(--spacing-xl);
}

.timeline::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 2px;
    background: var(--gray-light);
}

.timeline-item {
    position: relative;
    padding-bottom: var(--spacing-xl);
}

.timeline-marker {
    position: absolute;
    left: calc(var(--spacing-xl) * -1 - 6px);
    width: 12px;
    height: 12px;
    background: var(--primary-red);
    border-radius: 50%;
    border: 2px solid var(--white);
    box-shadow: var(--shadow-md);
}

/* Responsive Tables */
.table-wrapper {
    overflow-x: auto;
    background: var(--white);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
}

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

.table th,
.table td {
    padding: var(--spacing-md);
    text-align: left;
    border-bottom: 1px solid var(--gray-light);
}

.table th {
    background: var(--off-white);
    font-weight: 600;
    color: var(--gray-dark);
}

.table tr:hover {
    background: var(--off-white);
}

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

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

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

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