/* ==========================================================================
   scSAID Design System - Editorial Scientific Aesthetic
   A warm, sophisticated design inspired by dermatological research
   ========================================================================== */

/* --------------------------------------------------------------------------
   CSS Custom Properties (Design Tokens)
   -------------------------------------------------------------------------- */
:root {
    /* Typography */
    --font-display: 'Cormorant Garamond', Georgia, serif;
    --font-body: 'Source Sans 3', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', monospace;

    /* Color Palette - Warm Scientific */
    --color-primary: #1a2332;
    --color-primary-light: #2d3a4f;
    --color-secondary: #e8927c;
    --color-secondary-dark: #d4755d;
    --color-accent: #d4a574;
    --color-accent-light: #e8c9a8;

    /* Backgrounds */
    --bg-body: #faf8f5;
    --bg-surface: #ffffff;
    --bg-elevated: #ffffff;
    --bg-muted: #f5f2ed;
    --bg-dark: #1a2332;

    /* Text Colors */
    --text-primary: #1a2332;
    --text-secondary: #5a6473;
    --text-muted: #8b95a5;
    --text-inverse: #ffffff;
    --text-link: #c4725e;

    /* Borders */
    --border-light: #e5e0d8;
    --border-medium: #d1c9bd;
    --border-dark: #1a2332;

    /* Shadows */
    --shadow-sm: 0 1px 3px rgba(26, 35, 50, 0.08);
    --shadow-md: 0 4px 12px rgba(26, 35, 50, 0.1);
    --shadow-lg: 0 8px 30px rgba(26, 35, 50, 0.12);
    --shadow-xl: 0 20px 60px rgba(26, 35, 50, 0.15);

    /* Spacing Scale */
    --space-xs: 0.25rem;
    --space-sm: 0.5rem;
    --space-md: 1rem;
    --space-lg: 1.5rem;
    --space-xl: 2rem;
    --space-2xl: 3rem;
    --space-3xl: 4rem;
    --space-4xl: 6rem;

    /* Border Radius */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 20px;
    --radius-full: 9999px;

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 250ms ease;
    --transition-slow: 400ms cubic-bezier(0.4, 0, 0.2, 1);

    /* Layout */
    --header-height: 72px;
    --sidebar-width: 240px;
    --container-max: 1400px;
}

/* --------------------------------------------------------------------------
   CSS Reset & Base Styles
   -------------------------------------------------------------------------- */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-body);
    font-size: 16px;
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--bg-body);
}

/* --------------------------------------------------------------------------
   Typography
   -------------------------------------------------------------------------- */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-display);
    font-weight: 600;
    line-height: 1.2;
    color: var(--text-primary);
}

h1 { font-size: clamp(2.5rem, 5vw, 4rem); font-weight: 500; }
h2 { font-size: clamp(1.75rem, 3vw, 2.5rem); }
h3 { font-size: clamp(1.25rem, 2vw, 1.75rem); }
h4 { font-size: 1.25rem; }
h5 { font-size: 1.1rem; }
h6 { font-size: 1rem; }

p {
    margin-bottom: var(--space-md);
    color: var(--text-secondary);
}

a {
    color: var(--text-link);
    text-decoration: none;
    transition: color var(--transition-fast);
}

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

/* --------------------------------------------------------------------------
   Layout Components
   -------------------------------------------------------------------------- */
.container {
    width: 100%;
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--space-xl);
}

.section {
    padding: var(--space-4xl) 0;
}

.section--dark {
    background-color: var(--bg-dark);
    color: var(--text-inverse);
}

/* --------------------------------------------------------------------------
   Card Component
   -------------------------------------------------------------------------- */
.card {
    background: var(--bg-surface);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-light);
    overflow: hidden;
    transition: transform var(--transition-base), box-shadow var(--transition-base);
}

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

.card__image {
    width: 100%;
    height: 200px;
    object-fit: cover;
    display: block;
}

.card__content {
    padding: var(--space-lg);
}

.card__title {
    font-family: var(--font-display);
    font-size: 1.25rem;
    margin-bottom: var(--space-sm);
    color: var(--text-primary);
}

.card__text {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

/* --------------------------------------------------------------------------
   Button Component
   -------------------------------------------------------------------------- */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-sm);
    padding: var(--space-md) var(--space-xl);
    font-family: var(--font-body);
    font-size: 0.95rem;
    font-weight: 600;
    letter-spacing: 0.02em;
    text-transform: uppercase;
    border: 2px solid transparent;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all var(--transition-base);
    text-decoration: none;
}

.btn--primary {
    background-color: var(--color-secondary);
    color: var(--text-inverse);
    border-color: var(--color-secondary);
}

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

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

.btn--outline:hover {
    background-color: var(--color-primary);
    color: var(--text-inverse);
}

.btn--ghost {
    background-color: transparent;
    color: var(--text-secondary);
    border-color: var(--border-light);
}

.btn--ghost:hover {
    border-color: var(--color-secondary);
    color: var(--color-secondary);
}

/* --------------------------------------------------------------------------
   Table Component
   -------------------------------------------------------------------------- */
.data-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.9rem;
    background: var(--bg-surface);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
}

.data-table thead {
    background-color: var(--bg-dark);
    color: var(--text-inverse);
}

.data-table th {
    padding: var(--space-md) var(--space-lg);
    text-align: left;
    font-weight: 600;
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.data-table td {
    padding: var(--space-md) var(--space-lg);
    border-bottom: 1px solid var(--border-light);
    vertical-align: middle;
}

.data-table tbody tr {
    transition: background-color var(--transition-fast);
}

.data-table tbody tr:hover {
    background-color: var(--bg-muted);
}

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

.data-table a {
    color: var(--color-secondary);
    font-weight: 600;
}

.data-table a:hover {
    text-decoration: underline;
}

/* Selected row state */
.data-table tbody tr.selected-row {
    background-color: rgba(232, 146, 124, 0.1);
    border-left: 3px solid var(--color-secondary);
}

/* --------------------------------------------------------------------------
   Form Elements
   -------------------------------------------------------------------------- */
.form-input,
.form-select {
    width: 100%;
    padding: var(--space-md);
    font-family: var(--font-body);
    font-size: 1rem;
    color: var(--text-primary);
    background-color: var(--bg-surface);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-sm);
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.form-input:focus,
.form-select:focus {
    outline: none;
    border-color: var(--color-secondary);
    box-shadow: 0 0 0 3px rgba(232, 146, 124, 0.15);
}

.form-label {
    display: block;
    margin-bottom: var(--space-sm);
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

/* Custom Checkbox */
.checkbox-custom {
    display: inline-flex;
    align-items: center;
    cursor: pointer;
}

.checkbox-custom input[type="checkbox"] {
    width: 18px;
    height: 18px;
    margin-right: var(--space-sm);
    accent-color: var(--color-secondary);
    cursor: pointer;
}

/* Range Slider */
input[type="range"] {
    -webkit-appearance: none;
    width: 100%;
    height: 4px;
    background: var(--border-light);
    border-radius: var(--radius-full);
    outline: none;
}

input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 18px;
    height: 18px;
    background: var(--color-secondary);
    border-radius: 50%;
    cursor: pointer;
    transition: transform var(--transition-fast);
}

input[type="range"]::-webkit-slider-thumb:hover {
    transform: scale(1.2);
}

/* --------------------------------------------------------------------------
   Pagination Component
   -------------------------------------------------------------------------- */
.pagination {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-sm);
    margin-top: var(--space-xl);
    padding: var(--space-md) 0;
}

.pagination__btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 40px;
    height: 40px;
    padding: 0 var(--space-md);
    font-family: var(--font-body);
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--text-secondary);
    background: var(--bg-surface);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-sm);
    cursor: pointer;
    text-decoration: none;
    transition: all var(--transition-fast);
}

.pagination__btn:hover:not(.pagination__btn--disabled) {
    color: var(--color-secondary);
    border-color: var(--color-secondary);
}

.pagination__btn--active {
    background: var(--color-secondary);
    color: var(--text-inverse);
    border-color: var(--color-secondary);
}

.pagination__btn--disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.pagination__input {
    width: 60px;
    text-align: center;
}

/* --------------------------------------------------------------------------
   Stat Badge Component
   -------------------------------------------------------------------------- */
.stat-badge {
    display: inline-flex;
    flex-direction: column;
    align-items: center;
    padding: var(--space-lg) var(--space-xl);
    background: var(--bg-surface);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-lg);
    text-align: center;
    transition: all var(--transition-base);
}

.stat-badge:hover {
    border-color: var(--color-secondary);
    box-shadow: var(--shadow-md);
}

.stat-badge__number {
    font-family: var(--font-display);
    font-size: 2.5rem;
    font-weight: 600;
    color: var(--color-secondary);
    line-height: 1;
}

.stat-badge__label {
    margin-top: var(--space-sm);
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.1em;
}

/* --------------------------------------------------------------------------
   Navigation Link Pills
   -------------------------------------------------------------------------- */
.nav-pills {
    display: flex;
    gap: var(--space-lg);
    flex-wrap: wrap;
    justify-content: center;
}

.nav-pill {
    display: flex;
    align-items: center;
    justify-content: center;
    min-width: 140px;
    padding: var(--space-lg) var(--space-xl);
    font-family: var(--font-display);
    font-size: 1.1rem;
    font-weight: 500;
    color: var(--text-primary);
    background: var(--bg-surface);
    border: 2px solid var(--border-light);
    border-radius: var(--radius-full);
    text-decoration: none;
    transition: all var(--transition-base);
    cursor: pointer;
}

.nav-pill:hover {
    color: var(--color-secondary);
    border-color: var(--color-secondary);
    transform: translateY(-3px);
    box-shadow: var(--shadow-md);
}

.nav-pill:active {
    transform: translateY(-1px);
}

/* --------------------------------------------------------------------------
   Section Header
   -------------------------------------------------------------------------- */
.section-header {
    text-align: center;
    margin-bottom: var(--space-3xl);
}

.section-header__title {
    font-family: var(--font-display);
    font-size: clamp(1.75rem, 3vw, 2.5rem);
    font-weight: 500;
    color: var(--text-primary);
    margin-bottom: var(--space-md);
}

.section-header__subtitle {
    font-size: 1.1rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto;
}

.section-header__accent {
    display: inline-block;
    width: 60px;
    height: 3px;
    background-color: var(--color-secondary);
    margin-top: var(--space-lg);
    border-radius: var(--radius-full);
}

/* --------------------------------------------------------------------------
   Loading States
   -------------------------------------------------------------------------- */
.loader {
    width: 48px;
    height: 48px;
    border: 3px solid var(--border-light);
    border-top-color: var(--color-secondary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: var(--space-2xl) auto;
}

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

.skeleton {
    background: linear-gradient(90deg, var(--bg-muted) 25%, var(--bg-surface) 50%, var(--bg-muted) 75%);
    background-size: 200% 100%;
    animation: shimmer 1.5s infinite;
    border-radius: var(--radius-sm);
}

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

/* --------------------------------------------------------------------------
   Utility Classes
   -------------------------------------------------------------------------- */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.text-primary { color: var(--text-primary); }
.text-secondary { color: var(--text-secondary); }
.text-muted { color: var(--text-muted); }
.text-accent { color: var(--color-secondary); }

.bg-surface { background-color: var(--bg-surface); }
.bg-muted { background-color: var(--bg-muted); }
.bg-dark { background-color: var(--bg-dark); }

.mb-0 { margin-bottom: 0; }
.mb-1 { margin-bottom: var(--space-sm); }
.mb-2 { margin-bottom: var(--space-md); }
.mb-3 { margin-bottom: var(--space-lg); }
.mb-4 { margin-bottom: var(--space-xl); }

.mt-0 { margin-top: 0; }
.mt-1 { margin-top: var(--space-sm); }
.mt-2 { margin-top: var(--space-md); }
.mt-3 { margin-top: var(--space-lg); }
.mt-4 { margin-top: var(--space-xl); }

.visually-hidden {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

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

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

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

.animate-fade-in-up {
    animation: fadeInUp 0.6s ease forwards;
}

.animate-delay-1 { animation-delay: 0.1s; }
.animate-delay-2 { animation-delay: 0.2s; }
.animate-delay-3 { animation-delay: 0.3s; }
.animate-delay-4 { animation-delay: 0.4s; }

/* --------------------------------------------------------------------------
   Responsive Design
   -------------------------------------------------------------------------- */
@media (max-width: 1024px) {
    :root {
        --space-4xl: 4rem;
    }

    .container {
        padding: 0 var(--space-lg);
    }
}

@media (max-width: 768px) {
    :root {
        --header-height: 64px;
        --space-3xl: 2.5rem;
        --space-4xl: 3rem;
    }

    .nav-pills {
        gap: var(--space-md);
    }

    .nav-pill {
        min-width: 120px;
        padding: var(--space-md) var(--space-lg);
        font-size: 1rem;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 var(--space-md);
    }

    .btn {
        width: 100%;
    }
}