/* ============================================
   DESIGN TOKENS — Three-Layer Architecture
   Primitive → Semantic → Component
   ============================================ */

:root {
    /* --- Layer 1: Primitive (raw values) --- */
    --color-navy: #003893;
    --color-navy-dark: #00368D;
    --color-blue-light: #1D7BF0;
    --color-gold: #FFCC00;
    --color-yellow-light: #FFE600;
    --color-gold-dark: #E8A800;
    --color-white: #FFFFFF;
    --color-gray-50: #f8f9fc;
    --color-gray-100: #e8eaf0;
    --color-gray-500: #6b7280;
    --color-red-600: #c62828;

    /* Spacing scale (4px base) */
    --space-1: 4px;
    --space-2: 8px;
    --space-3: 12px;
    --space-4: 16px;
    --space-5: 20px;
    --space-6: 24px;
    --space-8: 32px;
    --space-10: 40px;

    /* Typography scale */
    --text-xs: 0.62rem;
    --text-sm: 0.8rem;
    --text-base: 0.85rem;
    --text-md: 0.9rem;
    --text-lg: 1.05rem;
    --text-xl: 1.6rem;

    /* Radius */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-full: 9999px;

    /* Transitions */
    --transition-fast: 0.15s ease;
    --transition-base: 0.2s ease;
    --transition-slow: 0.3s ease;

    /* Font families */
    --font-sans: 'Segoe UI', system-ui, -apple-system, sans-serif;

    /* --- Layer 2: Semantic (purpose aliases) --- */
    --color-primary: var(--color-navy);
    --color-primary-hover: var(--color-navy-dark);
    --color-accent: var(--color-gold);
    --color-accent-light: var(--color-yellow-light);
    --color-accent-dark: var(--color-gold-dark);
    --color-text: var(--color-navy);
    --color-text-muted: var(--color-gray-500);
    --color-text-inverse: var(--color-white);
    --color-bg: var(--color-white);
    --color-bg-subtle: var(--color-gray-50);
    --color-border: var(--color-gray-100);
    --color-danger: var(--color-red-600);

    /* Semantic spacing */
    --space-page: var(--space-5);
    --space-section: var(--space-10);
    --space-component: var(--space-4);

    /* Shadows */
    --shadow-sm: 0 2px 8px rgba(0, 56, 147, 0.06);
    --shadow-md: 0 4px 20px rgba(0, 0, 0, 0.12);
    --shadow-gold: 0 2px 8px rgba(232, 168, 0, 0.25);
    --shadow-focus: 0 0 0 3px rgba(0, 56, 147, 0.08);

    /* --- Layer 3: Component tokens --- */
    /* Button */
    --button-bg: var(--color-primary);
    --button-bg-hover: var(--color-primary-hover);
    --button-text: var(--color-text-inverse);
    --button-padding-y: 10px;
    --button-padding-x: 20px;
    --button-radius: var(--radius-sm);
    --button-font-size: var(--text-md);

    /* Input */
    --input-border: var(--color-border);
    --input-border-focus: var(--color-primary);
    --input-bg: var(--color-bg);
    --input-text: var(--color-text);
    --input-radius: var(--radius-md);

    /* Card */
    --card-bg: var(--color-bg);
    --card-border: var(--color-border);
    --card-border-hover: var(--color-accent);
    --card-radius: var(--radius-md);

    /* Badge */
    --badge-bg: linear-gradient(135deg, var(--color-accent-light), var(--color-accent-dark));
    --badge-text: var(--color-primary);
    --badge-radius: var(--radius-md);
    --badge-shadow: var(--shadow-gold);

    /* Toast */
    --toast-success-bg: var(--color-primary);
    --toast-error-bg: var(--color-danger);
    --toast-radius: var(--radius-sm);
    --toast-shadow: var(--shadow-md);
}

/* ============================================
   RESET
   ============================================ */

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

/* ============================================
   BASE
   ============================================ */

body {
    font-family: var(--font-sans);
    background: var(--color-bg);
    color: var(--color-text);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: var(--space-page);
}

.container {
    width: 100%;
    max-width: 800px;
}

/* ============================================
   HEADER
   ============================================ */

.header {
    text-align: center;
    padding: var(--space-8) var(--space-section) var(--space-6);
}

.header img {
    max-height: 90px;
    margin-bottom: var(--space-4);
}

.header h1 {
    font-size: var(--text-xl);
    font-weight: 700;
    color: var(--color-text);
    letter-spacing: -0.3px;
}

.header p.organizer {
    font-size: var(--text-md);
    color: var(--color-text);
    opacity: 0.75;
    margin-top: var(--space-3);
    font-weight: 500;
}

.header p.staff {
    font-size: var(--text-sm);
    color: var(--color-text);
    opacity: 0.5;
    margin-top: var(--space-1);
}

/* ============================================
   DIVIDER
   ============================================ */

.divider {
    height: 3px;
    background: linear-gradient(90deg, transparent, var(--color-accent), transparent);
    margin: 0 var(--space-section);
}

/* ============================================
   UPLOAD SECTION
   ============================================ */

.upload-section {
    padding: var(--space-3) var(--space-section);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-4);
    flex-wrap: wrap;
    background: var(--color-bg-subtle);
    border-bottom: 1px solid var(--color-border);
}

.upload-section .info {
    font-size: var(--text-base);
    color: var(--color-text);
    opacity: 0.6;
    display: flex;
    align-items: center;
    gap: var(--space-2);
}

.upload-section .info svg {
    width: 18px;
    height: 18px;
    flex-shrink: 0;
    opacity: 0.5;
}

/* Button component — states: default → hover → active */
.upload-btn {
    background: var(--button-bg);
    color: var(--button-text);
    padding: var(--button-padding-y) var(--button-padding-x);
    border-radius: var(--button-radius);
    cursor: pointer;
    font-size: var(--button-font-size);
    font-weight: 500;
    transition: background var(--transition-base);
    white-space: nowrap;
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    border: none;
}

.upload-btn:hover {
    background: var(--button-bg-hover);
}

.upload-btn:active {
    transform: translateY(1px);
}

.upload-btn svg {
    width: 18px;
    height: 18px;
}

.upload-btn input {
    display: none;
}

/* ============================================
   SEARCH SECTION
   ============================================ */

.search-section {
    padding: var(--space-6) var(--space-section) var(--space-5);
}

.search-box {
    position: relative;
    margin-bottom: var(--space-4);
}

/* Input component — states: default → focus */
.search-box input {
    width: 100%;
    padding: 14px 48px 14px 48px;
    font-size: var(--text-lg);
    border: 2px solid var(--input-border);
    border-radius: var(--input-radius);
    outline: none;
    transition: border-color var(--transition-base), box-shadow var(--transition-base);
    color: var(--input-text);
    background: var(--input-bg);
    font-family: var(--font-sans);
}

.search-box input::placeholder {
    color: var(--color-gray-500);
    opacity: 0.6;
}

.search-box input:focus {
    border-color: var(--input-border-focus);
    box-shadow: var(--shadow-focus);
}

.search-icon {
    position: absolute;
    left: var(--space-4);
    top: 50%;
    transform: translateY(-50%);
    color: var(--color-text-muted);
    display: flex;
    align-items: center;
}

.search-icon svg {
    width: 20px;
    height: 20px;
}

.clear-btn {
    position: absolute;
    right: var(--space-3);
    top: 50%;
    transform: translateY(-50%);
    background: var(--color-gray-100);
    border: none;
    border-radius: var(--radius-full);
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    color: var(--color-text-muted);
    transition: background var(--transition-fast), color var(--transition-fast);
    padding: 0;
}

.clear-btn:hover {
    background: var(--color-danger);
    color: var(--color-white);
}

.clear-btn svg {
    width: 16px;
    height: 16px;
}

/* ============================================
   RESULTS — Card component
   ============================================ */

.results {
    max-height: 500px;
    overflow-y: auto;
}

/* Card states: default → hover → attended */
.result-card {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 14px 18px;
    border: 1px solid var(--card-border);
    border-radius: var(--card-radius);
    margin-bottom: var(--space-2);
    transition: border-color var(--transition-base), background var(--transition-base);
    background: var(--card-bg);
}

.result-card:hover {
    border-color: var(--card-border-hover);
    background: rgba(255, 204, 0, 0.04);
}

.result-card.attended {
    border-color: #22c55e;
    background: rgba(34, 197, 94, 0.06);
}

.result-info {
    flex: 1;
    min-width: 0;
}

.result-name {
    font-size: var(--text-lg);
    font-weight: 600;
    color: var(--color-text);
    display: flex;
    align-items: center;
    gap: var(--space-2);
}

.result-name .rango {
    color: var(--color-text);
    opacity: 0.5;
    font-weight: 500;
    font-size: var(--text-md);
}

.result-detail {
    font-size: var(--text-sm);
    color: var(--color-text-muted);
    margin-top: var(--space-1);
}

/* Result actions — badge + attend button */
.result-actions {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    flex-shrink: 0;
}

/* Badge component */
.mesa-badge {
    background: var(--badge-bg);
    color: var(--badge-text);
    font-size: 1.3rem;
    font-weight: 700;
    padding: var(--space-2) var(--space-5);
    border-radius: var(--badge-radius);
    min-width: 56px;
    text-align: center;
    flex-shrink: 0;
    box-shadow: var(--badge-shadow);
}

.mesa-label {
    font-size: var(--text-xs);
    text-transform: uppercase;
    letter-spacing: 1px;
    opacity: 0.7;
    display: block;
    font-weight: 600;
}

/* ============================================
   ATTEND BUTTON
   ============================================ */

.btn-attend {
    display: inline-flex;
    align-items: center;
    gap: var(--space-1);
    padding: 8px 14px;
    border: 2px solid var(--color-border);
    border-radius: var(--radius-sm);
    background: var(--color-bg);
    color: var(--color-text-muted);
    font-size: var(--text-sm);
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-base);
    white-space: nowrap;
}

.btn-attend:hover {
    border-color: #22c55e;
    color: #22c55e;
    background: rgba(34, 197, 94, 0.08);
}

.btn-attend:active {
    transform: translateY(1px);
}

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

.btn-attend svg {
    width: 16px;
    height: 16px;
    flex-shrink: 0;
}

.btn-attend.attended {
    background: #22c55e;
    border-color: #22c55e;
    color: var(--color-white);
}

.btn-attend.attended:hover {
    background: #16a34a;
    border-color: #16a34a;
    color: var(--color-white);
}

/* ============================================
   EMPTY STATES
   ============================================ */

.no-results {
    text-align: center;
    padding: var(--space-10) var(--space-5);
    color: var(--color-text-muted);
    font-size: 0.95rem;
}

.no-results svg {
    width: 36px;
    height: 36px;
    margin: 0 auto var(--space-3);
    display: block;
    opacity: 0.25;
}

/* ============================================
   STATS
   ============================================ */

.stats {
    text-align: center;
    padding: var(--space-3) var(--space-section) var(--space-6);
    font-size: var(--text-sm);
    color: var(--color-text-muted);
}

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

/* ============================================
   TOAST — Notification component
   ============================================ */

.toast {
    position: fixed;
    top: var(--space-5);
    right: var(--space-5);
    padding: 14px 22px;
    border-radius: var(--toast-radius);
    color: var(--color-text-inverse);
    font-size: var(--text-md);
    font-weight: 500;
    box-shadow: var(--toast-shadow);
    z-index: 1000;
    opacity: 0;
    transform: translateY(-20px);
    transition: all var(--transition-slow);
    display: flex;
    align-items: center;
    gap: var(--space-3);
    max-width: 360px;
}

.toast.show {
    opacity: 1;
    transform: translateY(0);
}

.toast.success {
    background: var(--toast-success-bg);
}

.toast.error {
    background: var(--toast-error-bg);
}

.toast svg {
    width: 20px;
    height: 20px;
    flex-shrink: 0;
}

/* ============================================
   LOADING
   ============================================ */

.loading {
    text-align: center;
    padding: var(--space-8);
    color: var(--color-text-muted);
}

.spinner {
    border: 3px solid var(--color-border);
    border-top: 3px solid var(--color-primary);
    border-radius: 50%;
    width: 28px;
    height: 28px;
    animation: spin 0.8s linear infinite;
    margin: 0 auto var(--space-3);
}

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

/* ============================================
   RESPONSIVE
   ============================================ */

@media (max-width: 600px) {
    .header h1 { font-size: 1.25rem; }
    .search-section, .upload-section { padding: var(--space-4) var(--space-5); }
    .header { padding: var(--space-6) var(--space-5) var(--space-5); }
    .divider { margin: 0 var(--space-5); }
    .stats { padding: var(--space-3) var(--space-5) var(--space-5); }
    .result-card {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--space-3);
    }
    .mesa-badge { align-self: flex-end; }
    .result-actions { flex-direction: column; align-items: flex-end; gap: var(--space-2); }
    .btn-attend { width: 100%; justify-content: center; }
}