/* Bio-Stride Shared Styles Framework */

/* ========== CSS RESET & BASE STYLES ========== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

/* ========== CSS CUSTOM PROPERTIES ========== */
:root {
    /* Colors */
    --primary-blue: #00B4D8;
    --dark-blue: #003045;
    --light-blue: #90E0EF;
    --accent-pink: #FF006E;
    --text-dark: #1A1A1A;
    --text-light: #666;
    --bg-light: #F8F9FA;
    --white: #FFFFFF;
    --success-green: #10B981;
    --warning-yellow: #F59E0B;
    --error-red: #EF4444;
    
    /* Gradients */
    --gradient-primary: linear-gradient(135deg, var(--primary-blue) 0%, var(--dark-blue) 100%);
    --gradient-light: linear-gradient(135deg, var(--light-blue) 0%, var(--primary-blue) 100%);
    --gradient-hero: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
    
    /* Shadows */
    --shadow-small: 0 2px 10px rgba(0, 0, 0, 0.1);
    --shadow-medium: 0 4px 20px rgba(0, 0, 0, 0.1);
    --shadow-large: 0 10px 40px rgba(0, 0, 0, 0.15);
    --shadow-primary: 0 4px 20px rgba(0, 180, 216, 0.2);
    --shadow-hover: 0 8px 30px rgba(0, 180, 216, 0.15);
    
    /* Transitions */
    --transition-fast: all 0.2s ease;
    --transition-normal: all 0.3s ease;
    --transition-slow: all 0.5s ease;
    
    /* Border Radius */
    --radius-small: 8px;
    --radius-medium: 12px;
    --radius-large: 20px;
    --radius-full: 50px;
    
    /* Typography */
    --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 2rem;
    --font-size-4xl: 2.5rem;
    --font-size-5xl: 3rem;
    
    /* Spacing */
    --spacing-1: 0.25rem;
    --spacing-2: 0.5rem;
    --spacing-3: 0.75rem;
    --spacing-4: 1rem;
    --spacing-5: 1.25rem;
    --spacing-6: 1.5rem;
    --spacing-8: 2rem;
    --spacing-10: 2.5rem;
    --spacing-12: 3rem;
    --spacing-16: 4rem;
    --spacing-20: 5rem;
    
    /* Z-index layers */
    --z-dropdown: 100;
    --z-sticky: 200;
    --z-fixed: 300;
    --z-modal-backdrop: 400;
    --z-modal: 500;
    --z-popover: 600;
    --z-tooltip: 700;
    --z-notification: 800;
}

/* ========== BASE STYLES ========== */
html {
    scroll-behavior: smooth;
    font-size: 100%;
}

body {
    font-family: var(--font-family);
    color: var(--text-dark);
    line-height: 1.6;
    overflow-x: hidden;
    width: 100%;
    max-width: 100%;
    background-color: var(--white);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* ========== LAYOUT UTILITIES ========== */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-4);
    width: 100%;
}

.container-fluid {
    width: 100%;
    padding: 0 var(--spacing-4);
}

.section {
    padding: var(--spacing-16) 0;
}

.section-sm {
    padding: var(--spacing-12) 0;
}

.section-lg {
    padding: var(--spacing-20) 0;
}

/* ========== GRID SYSTEM ========== */
.grid {
    display: grid;
    gap: var(--spacing-6);
}

.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); }
.grid-cols-auto { grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); }

/* ========== NAVIGATION SYSTEM ========== */
.navbar {
    position: fixed;
    top: 0;
    width: 100%;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    z-index: var(--z-fixed);
    box-shadow: var(--shadow-small);
    transition: var(--transition-normal);
}

.navbar.scrolled {
    box-shadow: var(--shadow-medium);
    background: rgba(255, 255, 255, 0.98);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--spacing-4) var(--spacing-6);
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 100%;
}

.logo {
    display: flex;
    align-items: center;
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: var(--primary-blue);
    text-decoration: none;
    transition: var(--transition-normal);
}

.logo:hover {
    color: var(--dark-blue);
}

.logo svg {
    height: 40px;
    margin-right: var(--spacing-2);
}

.nav-links {
    display: flex;
    gap: var(--spacing-8);
    align-items: center;
    list-style: none;
}

.nav-link {
    text-decoration: none;
    color: var(--text-dark);
    font-weight: 500;
    transition: var(--transition-normal);
    position: relative;
    padding: var(--spacing-2) 0;
}

.nav-link:hover {
    color: var(--primary-blue);
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--primary-blue);
    transition: width var(--transition-normal);
}

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

.nav-link.active {
    color: var(--primary-blue);
}

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

/* Mobile Menu */
.mobile-menu-btn {
    display: none;
    background: none;
    border: none;
    font-size: var(--font-size-xl);
    cursor: pointer;
    color: var(--primary-blue);
    transition: var(--transition-normal);
    z-index: calc(var(--z-fixed) + 1);
    padding: var(--spacing-2);
}

.mobile-menu-btn:hover {
    transform: scale(1.1);
}

.mobile-menu-btn.active {
    color: var(--dark-blue);
}

/* ========== BUTTONS ========== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-2);
    padding: var(--spacing-3) var(--spacing-6);
    border-radius: var(--radius-full);
    text-decoration: none;
    font-weight: 600;
    font-size: var(--font-size-base);
    cursor: pointer;
    border: none;
    transition: var(--transition-normal);
    position: relative;
    overflow: hidden;
}

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

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

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

.btn-secondary:hover {
    background: var(--primary-blue);
    color: var(--white);
    transform: translateY(-2px);
}

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

.btn-outline:hover {
    background: var(--text-dark);
    color: var(--white);
    border-color: var(--text-dark);
}

.btn-ghost {
    background: transparent;
    color: var(--primary-blue);
    border: none;
}

.btn-ghost:hover {
    background: rgba(0, 180, 216, 0.1);
}

.btn-lg {
    padding: var(--spacing-4) var(--spacing-8);
    font-size: var(--font-size-lg);
}

.btn-sm {
    padding: var(--spacing-2) var(--spacing-4);
    font-size: var(--font-size-sm);
}

/* Button loading state */
.btn.loading {
    pointer-events: none;
    opacity: 0.7;
}

.btn.loading::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 20px;
    height: 20px;
    border: 2px solid transparent;
    border-top: 2px solid currentColor;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% { transform: translate(-50%, -50%) rotate(0deg); }
    100% { transform: translate(-50%, -50%) rotate(360deg); }
}

/* ========== CARDS ========== */
.card {
    background: var(--white);
    border-radius: var(--radius-medium);
    padding: var(--spacing-6);
    box-shadow: var(--shadow-small);
    border: 1px solid rgba(0, 180, 216, 0.1);
    transition: var(--transition-normal);
    position: relative;
    overflow: hidden;
}

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

.card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: var(--gradient-primary);
    transform: scaleX(0);
    transition: transform var(--transition-normal);
}

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

.card-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-4);
    margin-bottom: var(--spacing-4);
}

.card-title {
    font-size: var(--font-size-xl);
    color: var(--dark-blue);
    margin-bottom: var(--spacing-2);
    font-weight: 600;
}

.card-subtitle {
    color: var(--primary-blue);
    font-size: var(--font-size-base);
    margin-bottom: var(--spacing-4);
}

.card-content {
    color: var(--text-light);
    line-height: 1.7;
    margin-bottom: var(--spacing-4);
}

.card-footer {
    padding-top: var(--spacing-4);
    border-top: 1px solid rgba(0, 180, 216, 0.1);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

/* ========== FORMS ========== */
.form-group {
    margin-bottom: var(--spacing-5);
}

.form-label {
    display: block;
    margin-bottom: var(--spacing-2);
    color: var(--dark-blue);
    font-weight: 600;
    font-size: var(--font-size-sm);
}

.form-input,
.form-textarea,
.form-select {
    width: 100%;
    padding: var(--spacing-4);
    border: 2px solid transparent;
    border-radius: var(--radius-medium);
    background: var(--bg-light);
    color: var(--text-dark);
    font-size: var(--font-size-base);
    transition: var(--transition-normal);
}

.form-input:focus,
.form-textarea:focus,
.form-select:focus {
    outline: none;
    border-color: var(--primary-blue);
    background: var(--white);
    box-shadow: 0 0 0 3px rgba(0, 180, 216, 0.1);
}

.form-input::placeholder,
.form-textarea::placeholder {
    color: var(--text-light);
}

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

.form-error {
    color: var(--error-red);
    font-size: var(--font-size-sm);
    margin-top: var(--spacing-1);
}

.form-help {
    color: var(--text-light);
    font-size: var(--font-size-sm);
    margin-top: var(--spacing-1);
}

/* ========== TYPOGRAPHY ========== */
h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: var(--spacing-4);
    color: var(--dark-blue);
}

h1 { font-size: var(--font-size-5xl); }
h2 { font-size: var(--font-size-4xl); }
h3 { font-size: var(--font-size-3xl); }
h4 { font-size: var(--font-size-2xl); }
h5 { font-size: var(--font-size-xl); }
h6 { font-size: var(--font-size-lg); }

p {
    margin-bottom: var(--spacing-4);
    color: var(--text-light);
    line-height: 1.7;
}

.text-xs { font-size: var(--font-size-xs); }
.text-sm { font-size: var(--font-size-sm); }
.text-base { font-size: var(--font-size-base); }
.text-lg { font-size: var(--font-size-lg); }
.text-xl { font-size: var(--font-size-xl); }
.text-2xl { font-size: var(--font-size-2xl); }
.text-3xl { font-size: var(--font-size-3xl); }
.text-4xl { font-size: var(--font-size-4xl); }
.text-5xl { font-size: var(--font-size-5xl); }

.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.text-primary { color: var(--primary-blue); }
.text-dark { color: var(--dark-blue); }
.text-light { color: var(--text-light); }
.text-white { color: var(--white); }
.text-success { color: var(--success-green); }
.text-warning { color: var(--warning-yellow); }
.text-error { color: var(--error-red); }

.font-light { font-weight: 300; }
.font-normal { font-weight: 400; }
.font-medium { font-weight: 500; }
.font-semibold { font-weight: 600; }
.font-bold { font-weight: 700; }

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

@keyframes slideInLeft {
    from {
        opacity: 0;
        transform: translateX(-30px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes slideInRight {
    from {
        opacity: 0;
        transform: translateX(30px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-10px); }
}

@keyframes pulse {
    0% {
        transform: scale(1);
        opacity: 1;
    }
    100% {
        transform: scale(1.3);
        opacity: 0;
    }
}

.animate-fade-in {
    animation: fadeIn 0.6s ease-out;
}

.animate-slide-in-left {
    animation: slideInLeft 0.6s ease-out;
}

.animate-slide-in-right {
    animation: slideInRight 0.6s ease-out;
}

.animate-float {
    animation: float 3s ease-in-out infinite;
}

.animate-pulse {
    animation: pulse 2s infinite;
}

/* ========== UTILITIES ========== */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

.hidden {
    display: none !important;
}

.visible {
    display: block !important;
}

.flex {
    display: flex;
}

.inline-flex {
    display: inline-flex;
}

.items-center {
    align-items: center;
}

.items-start {
    align-items: flex-start;
}

.items-end {
    align-items: flex-end;
}

.justify-center {
    justify-content: center;
}

.justify-between {
    justify-content: space-between;
}

.justify-around {
    justify-content: space-around;
}

.justify-start {
    justify-content: flex-start;
}

.justify-end {
    justify-content: flex-end;
}

.gap-1 { gap: var(--spacing-1); }
.gap-2 { gap: var(--spacing-2); }
.gap-3 { gap: var(--spacing-3); }
.gap-4 { gap: var(--spacing-4); }
.gap-6 { gap: var(--spacing-6); }
.gap-8 { gap: var(--spacing-8); }

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

.rounded { border-radius: var(--radius-small); }
.rounded-md { border-radius: var(--radius-medium); }
.rounded-lg { border-radius: var(--radius-large); }
.rounded-full { border-radius: var(--radius-full); }

.shadow-sm { box-shadow: var(--shadow-small); }
.shadow-md { box-shadow: var(--shadow-medium); }
.shadow-lg { box-shadow: var(--shadow-large); }

.bg-primary { background-color: var(--primary-blue); }
.bg-dark { background-color: var(--dark-blue); }
.bg-light { background-color: var(--bg-light); }
.bg-white { background-color: var(--white); }

.p-2 { padding: var(--spacing-2); }
.p-4 { padding: var(--spacing-4); }
.p-6 { padding: var(--spacing-6); }
.p-8 { padding: var(--spacing-8); }

.m-2 { margin: var(--spacing-2); }
.m-4 { margin: var(--spacing-4); }
.m-6 { margin: var(--spacing-6); }
.m-8 { margin: var(--spacing-8); }

.mb-2 { margin-bottom: var(--spacing-2); }
.mb-4 { margin-bottom: var(--spacing-4); }
.mb-6 { margin-bottom: var(--spacing-6); }
.mb-8 { margin-bottom: var(--spacing-8); }

.mt-2 { margin-top: var(--spacing-2); }
.mt-4 { margin-top: var(--spacing-4); }
.mt-6 { margin-top: var(--spacing-6); }
.mt-8 { margin-top: var(--spacing-8); }

/* ========== RESPONSIVE DESIGN ========== */
@media (max-width: 1024px) {
    .container {
        padding: 0 var(--spacing-6);
    }
    
    h1 { font-size: var(--font-size-4xl); }
    h2 { font-size: var(--font-size-3xl); }
    h3 { font-size: var(--font-size-2xl); }
}

@media (max-width: 768px) {
    .container {
        padding: 0 var(--spacing-4);
    }
    
    .nav-container {
        padding: var(--spacing-3) var(--spacing-4);
        position: relative;
    }
    
    .mobile-menu-btn {
        display: block;
        order: 2;
    }
    
    .logo {
        order: 1;
        font-size: var(--font-size-lg);
    }
    
    .nav-links {
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: rgba(255, 255, 255, 0.98);
        backdrop-filter: blur(20px);
        flex-direction: column;
        gap: var(--spacing-4);
        padding: var(--spacing-8) var(--spacing-4);
        display: none;
        box-shadow: var(--shadow-medium);
        border-radius: 0 0 var(--radius-large) var(--radius-large);
        animation: slideDown 0.3s ease-out;
        order: 3;
    }
    
    .nav-links.active {
        display: flex;
    }
    
    .nav-link {
        padding: var(--spacing-3) var(--spacing-4);
        border-radius: var(--radius-medium);
        transition: var(--transition-normal);
        text-align: center;
        font-weight: 500;
    }
    
    .nav-link:hover {
        background: var(--light-blue);
        transform: translateX(5px);
    }
    
    @keyframes slideDown {
        from {
            opacity: 0;
            transform: translateY(-20px);
        }
        to {
            opacity: 1;
            transform: translateY(0);
        }
    }
    
    h1 { font-size: var(--font-size-3xl); }
    h2 { font-size: var(--font-size-2xl); }
    h3 { font-size: var(--font-size-xl); }
    
    .grid-cols-2 { grid-template-columns: 1fr; }
    .grid-cols-3 { grid-template-columns: 1fr; }
    .grid-cols-4 { grid-template-columns: 1fr; }
    
    .section {
        padding: var(--spacing-12) 0;
    }
    
    .btn {
        width: 100%;
        justify-content: center;
    }
    
    .btn-group .btn {
        width: auto;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 var(--spacing-3);
    }
    
    h1 { font-size: var(--font-size-2xl); }
    h2 { font-size: var(--font-size-xl); }
    
    .card {
        padding: var(--spacing-4);
    }
    
    .btn {
        padding: var(--spacing-3) var(--spacing-4);
        font-size: var(--font-size-sm);
    }
    
    .btn-lg {
        padding: var(--spacing-4) var(--spacing-6);
        font-size: var(--font-size-base);
    }
}

/* ========== DARK MODE SUPPORT ========== */
@media (prefers-color-scheme: dark) {
    :root {
        --text-dark: #E5E7EB;
        --text-light: #9CA3AF;
        --bg-light: #111827;
        --white: #1F2937;
    }
    
    body {
        background-color: #0F172A;
        color: var(--text-dark);
    }
    
    .navbar {
        background: rgba(31, 41, 55, 0.95);
    }
    
    .card {
        border-color: rgba(75, 85, 99, 0.3);
    }
}

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

/* Focus styles for better accessibility */
*:focus {
    outline: 2px solid var(--primary-blue);
    outline-offset: 2px;
}

.btn:focus,
.form-input:focus,
.form-textarea:focus,
.form-select:focus {
    outline: none;
    box-shadow: 0 0 0 3px rgba(0, 180, 216, 0.3);
}

/* High contrast mode support */
@media (prefers-contrast: high) {
    :root {
        --primary-blue: #0066CC;
        --dark-blue: #000080;
        --text-light: #333333;
    }
    
    .card {
        border: 2px solid var(--text-dark);
    }
    
    .btn {
        border: 2px solid currentColor;
    }
}

/* Print styles */
@media print {
    .navbar,
    .mobile-menu-btn,
    .btn,
    .nav-links {
        display: none !important;
    }
    
    .card {
        box-shadow: none;
        border: 1px solid #000;
    }
    
    a {
        text-decoration: underline;
    }
    
    .section {
        page-break-inside: avoid;
    }
}