/* ═══════════════════════════════════════════════════════════════
   BASE CSS - Design System Variables & Global Styles
   ═══════════════════════════════════════════════════════════════ */

:root {
    /* Slate Color Palette */
    --slate-900: #0f172a;
    --slate-800: #1e293b;
    --slate-700: #334155;
    --slate-600: #475569;
    --slate-500: #64748b;
    --slate-400: #94a3b8;
    --slate-300: #cbd5e1;
    --slate-200: #e2e8f0;
    --slate-100: #f1f5f9;
    --slate-50: #f8fafc;

    /* Accent Colors */
    --amber-500: #f59e0b;
    --amber-400: #fbbf24;
    --amber-600: #d97706;

    --emerald-500: #10b981;
    --emerald-600: #059669;
    --emerald-50: #ecfdf5;
    --blue-500: #3b82f6;
    --blue-600: #2563eb;
    --rose-500: #f43f5e;
    --rose-600: #e11d48;

    /* Quality Colors */
    --quality-p: #10b981;
    --quality-a: #3b82f6;
    --quality-b: #f59e0b;
    --quality-c: #f43f5e;
    --quality-ov: #64748b;

    /* Typography */
    --font-display: 'DM Sans', sans-serif;

    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
    --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
}

* {
    font-family: var(--font-display);
}

body {
    background: var(--slate-100);
    color: var(--slate-800);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Main Content */
.main-content {
    padding: 2rem 0;
    flex: 1;
}

/* Filter Section */
.filter-card {
    background: white;
    border-radius: 1rem;
    padding: 1.5rem;
    box-shadow: var(--shadow-md);
    border: 1px solid var(--slate-200);
    margin-bottom: 2rem;
    position: relative;
    z-index: 10;
}

.filter-label {
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--slate-500);
    margin-bottom: 0.5rem;
}

.form-control, .form-select {
    border: 2px solid var(--slate-200);
    border-radius: 0.5rem;
    padding: 0.625rem 1rem;
    font-size: 0.9375rem;
    transition: all 0.2s ease;
}

.form-control:focus, .form-select:focus {
    border-color: var(--slate-400);
    box-shadow: 0 0 0 3px rgba(100, 116, 139, 0.1);
}

/* Stats Bar */
.stats-bar {
    background: white;
    border-radius: 0.75rem;
    padding: 1rem 1.5rem;
    margin-bottom: 1.5rem;
    box-shadow: var(--shadow-sm);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.stats-text {
    font-size: 0.875rem;
    color: var(--slate-500);
}

.stats-text strong {
    color: var(--slate-800);
    font-weight: 600;
}

/* Empty State */
.empty-state {
    text-align: center;
    padding: 4rem 2rem;
    background: white;
    border-radius: 1rem;
    box-shadow: var(--shadow-md);
}

.empty-state i {
    font-size: 4rem;
    color: var(--slate-300);
    margin-bottom: 1rem;
}

.empty-state h3 {
    color: var(--slate-600);
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.empty-state p {
    color: var(--slate-400);
}

/* Offers Section */
.offers-section {
    margin-top: 3rem;
    padding-top: 2rem;
    border-top: 2px solid var(--slate-200);
}

.offers-section h2 {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--slate-800);
    margin-bottom: 1.5rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.offer-card {
    background: white;
    border-radius: 0.75rem;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--slate-200);
    margin-bottom: 1rem;
    overflow: hidden;
}

.offer-card-header {
    padding: 1rem 1.25rem;
    background: var(--slate-50);
    border-bottom: 1px solid var(--slate-200);
    display: flex;
    justify-content: space-between;
    align-items: center;
    cursor: pointer;
}

.offer-card-header:hover {
    background: var(--slate-100);
}

.offer-number {
    font-weight: 600;
    color: var(--slate-800);
}

.offer-meta {
    font-size: 0.8125rem;
    color: var(--slate-500);
}

.offer-stats {
    display: flex;
    gap: 1rem;
    align-items: center;
}

.offer-stats .badge {
    font-size: 0.75rem;
    font-weight: 500;
    padding: 0.375rem 0.75rem;
}

.offer-card-body {
    padding: 0;
}

.offer-total {
    padding: 1rem 1.25rem;
    background: var(--slate-50);
    border-top: 2px solid var(--slate-200);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.offer-total-label {
    font-weight: 500;
    color: var(--slate-600);
}

.offer-total-value {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--slate-800);
}

/* Footer */
.footer {
    background: var(--slate-800);
    color: var(--slate-400);
    padding: 1.5rem 0;
    margin-top: 4rem;
    font-size: 0.875rem;
}

.footer-lang-selector {
    display: inline-flex;
    align-items: center;
    gap: 0.375rem;
    padding: 0.25rem;
    background: rgba(0, 0, 0, 0.2);
    border-radius: 2rem;
    margin-bottom: 0.75rem;
}

.footer-lang-link {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 2.25rem;
    height: 1.75rem;
    padding: 0 0.5rem;
    border-radius: 1rem;
    color: var(--slate-400);
    text-decoration: none;
    font-size: 0.75rem;
    font-weight: 500;
    letter-spacing: 0.025em;
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
}

.footer-lang-link:hover {
    color: white;
    background: rgba(255, 255, 255, 0.1);
}

.footer-lang-link.active {
    color: white;
    background: var(--emerald-500);
    box-shadow: 0 0 12px rgba(16, 185, 129, 0.4);
}

.footer-lang-link.active:hover {
    background: var(--emerald-600);
    box-shadow: 0 0 16px rgba(16, 185, 129, 0.5);
}