/* ========== VARIABLES (tomadas de la página de referencia) ========== */
:root {
    --bg-primary: #121212;
    --bg-secondary: #1A1A1A;
    --bg-card: #2A2A2A;
    --bg-input: #2A2A2A;          /* igual que bg-card */
    --accent: #0B4F5C;
    --accent-hover: #1B7A8C;
    --text-primary: #F0F0F0;
    --text-secondary: #B0B0B0;
    --text-muted: #888888;
    --danger: #f44336;
    --success: #4caf50;
    --border: rgba(255,255,255,0.08);
    --shadow: 0 8px 24px rgba(0,0,0,0.4);
    --radius: 12px;
    --transition: 0.3s ease;
    --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
}

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

body {
    font-family: var(--font);
    background: var(--bg-primary);
    color: var(--text-primary);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 1.5rem;
    -webkit-font-smoothing: antialiased;
}

#app {
    max-width: 900px;
    width: 100%;
    background: var(--bg-secondary);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    padding: 2rem 2rem 2.5rem;
    border: 1px solid var(--border);
    position: relative;
}

/* ========== ENCABEZADO CON LOGO ========== */
header {
    text-align: center;
    margin-bottom: 2rem;
}

.brand-header {
    display: flex;
    justify-content: center;
    margin-bottom: 1rem;
}

.logo {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    font-size: 1.8rem;
    font-weight: 700;
    color: #fff;
    letter-spacing: -0.02em;
    text-decoration: none;
}
.logo svg {
    width: 32px;
    height: 32px;
}
.logo span {
    color: var(--accent);
}

.survey-title h1 {
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 0.3rem;
    letter-spacing: -0.02em;
}
.survey-title p {
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.5;
}

/* ========== PROGRESO ========== */
#progress-bar {
    width: 100%;
    height: 4px;
    background: var(--bg-input);
    border-radius: 4px;
    margin-bottom: 0.5rem;
    overflow: hidden;
}
#progress-fill {
    height: 100%;
    width: 0%;
    background: var(--accent);
    border-radius: 4px;
    transition: width 0.4s ease;
}
#step-indicator {
    text-align: center;
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
}

/* ========== PREGUNTAS ========== */
#question-container {
    background: var(--bg-card);
    border-radius: var(--radius);
    padding: 1.75rem 1.5rem;
    margin-bottom: 2rem;
    border: 1px solid var(--border);
    min-height: 200px;
    transition: opacity 0.25s ease;
}
#question-container .q-number {
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: var(--accent);
    margin-bottom: 0.5rem;
}
#question-container .q-text {
    font-size: 1.15rem;
    font-weight: 500;
    line-height: 1.5;
    margin-bottom: 1rem;
    color: var(--text-primary);
}
#question-container .q-hint {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-bottom: 1rem;
}

#question-container input[type="text"],
#question-container input[type="number"],
#question-container select,
#question-container textarea {
    width: 100%;
    padding: 12px 14px;
    background: var(--bg-input);
    border: 1px solid var(--border);
    border-radius: 8px;
    color: var(--text-primary);
    font-size: 1rem;
    font-family: inherit;
    outline: none;
    transition: border-color var(--transition), box-shadow var(--transition);
    margin-top: 6px;
}
#question-container input:focus,
#question-container select:focus,
#question-container textarea:focus {
    border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(11, 79, 92, 0.2);
}
#question-container textarea {
    min-height: 100px;
    resize: vertical;
}
#question-container select option {
    background: var(--bg-card);
}

.options {
    display: flex;
    flex-direction: column;
    gap: 8px;
    margin-top: 10px;
}
.options.inline {
    flex-direction: row;
    flex-wrap: wrap;
    gap: 8px;
}

.opt-label {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 10px 16px;
    background: var(--bg-input);
    border: 1px solid var(--border);
    border-radius: 8px;
    cursor: pointer;
    transition: all var(--transition);
    font-size: 0.95rem;
    color: var(--text-primary);
}
.opt-label:hover {
    border-color: var(--accent);
    background: #333;
}
.opt-label input {
    accent-color: var(--accent);
    width: 17px;
    height: 17px;
    flex-shrink: 0;
}
.opt-label.selected {
    border-color: var(--accent);
    background: rgba(11, 79, 92, 0.15);
}

/* ========== NAVEGACIÓN ========== */
#navigation {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 1rem;
    margin-top: 0.5rem;
}
.nav-btn {
    padding: 12px 28px;
    background: transparent;
    border: 1px solid var(--border);
    border-radius: 8px;
    color: var(--text-primary);
    font-size: 0.95rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition);
    background: var(--bg-input);
    min-width: 120px;
}
.nav-btn:hover:not(:disabled) {
    border-color: var(--accent);
    background: rgba(11, 79, 92, 0.08);
}
.nav-btn:disabled {
    opacity: 0.35;
    cursor: not-allowed;
}
.nav-btn:active:not(:disabled) {
    transform: scale(0.97);
}

#submit-section {
    text-align: center;
    margin-top: 1.5rem;
}
#submit-btn {
    width: 100%;
    padding: 14px;
    background: var(--accent);
    border: none;
    border-radius: 8px;
    color: #fff;
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: background var(--transition), transform 0.15s;
}
#submit-btn:hover {
    background: var(--accent-hover);
}
#submit-btn:active {
    transform: scale(0.98);
}
#submit-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none;
}

/* ========== ADMIN TRIGGER ========== */
#admin-trigger {
    text-align: right;
    margin-top: 1.5rem;
}
#admin-login-btn {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    font-size: 0.75rem;
    cursor: pointer;
    padding: 4px 8px;
    border-radius: 4px;
    transition: color var(--transition);
}
#admin-login-btn:hover {
    color: var(--accent);
}

/* ========== PANEL ADMIN ========== */
#admin-panel {
    margin-top: 1rem;
}
#admin-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    margin-bottom: 1.5rem;
    justify-content: center;
}
.admin-btn {
    padding: 10px 20px;
    background: var(--bg-input);
    border: 1px solid var(--border);
    border-radius: 8px;
    color: var(--text-primary);
    font-size: 0.95rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition);
}
.admin-btn:hover {
    border-color: var(--accent);
    background: rgba(11, 79, 92, 0.08);
}
.admin-btn.logout {
    border-color: var(--danger);
    color: var(--danger);
}
.admin-btn.logout:hover {
    background: rgba(244, 67, 54, 0.12);
}

#admin-content {
    background: var(--bg-card);
    border-radius: var(--radius);
    padding: 1.5rem;
    border: 1px solid var(--border);
    min-height: 200px;
}

/* ========== TABLA ========== */
.table-responsive {
    overflow-x: auto;
}
.admin-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.85rem;
}
.admin-table th {
    text-align: left;
    padding: 10px 12px;
    background: var(--bg-input);
    color: var(--text-secondary);
    font-weight: 600;
    border-bottom: 2px solid var(--border);
    white-space: nowrap;
    position: sticky;
    top: 0;
}
.admin-table td {
    padding: 8px 12px;
    border-bottom: 1px solid var(--border);
    max-width: 150px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}
.admin-table tr:hover td {
    background: rgba(11, 79, 92, 0.05);
}
.admin-table .delete-btn {
    background: transparent;
    border: none;
    color: var(--danger);
    cursor: pointer;
    font-size: 1rem;
    padding: 2px 6px;
    border-radius: 4px;
    transition: background var(--transition);
}
.admin-table .delete-btn:hover {
    background: rgba(244, 67, 54, 0.15);
}

/* ========== BLOQUES ========== */
.responses-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 16px;
}
.response-block {
    background: var(--bg-input);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1rem;
    transition: all var(--transition);
    position: relative;
}
.response-block:hover {
    border-color: var(--accent);
}
.response-block.selected {
    border-color: var(--accent);
    background: rgba(11, 79, 92, 0.08);
}
.response-block .block-header {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 0.5rem;
}
.response-block .block-header input[type="checkbox"] {
    accent-color: var(--accent);
    width: 18px;
    height: 18px;
    cursor: pointer;
}
.response-block .block-title {
    font-weight: 600;
    font-size: 1rem;
    flex: 1;
}
.response-block .block-date {
    font-size: 0.75rem;
    color: var(--text-secondary);
}
.response-block .block-actions {
    display: flex;
    gap: 8px;
    margin-top: 0.5rem;
}
.response-block .block-actions button {
    background: transparent;
    border: 1px solid var(--border);
    border-radius: 6px;
    color: var(--text-secondary);
    padding: 4px 12px;
    font-size: 0.8rem;
    cursor: pointer;
    transition: all var(--transition);
}
.response-block .block-actions button:hover {
    border-color: var(--accent);
    color: var(--text-primary);
}
.response-block .block-actions .delete-block-btn {
    border-color: var(--danger);
    color: var(--danger);
}
.response-block .block-actions .delete-block-btn:hover {
    background: rgba(244, 67, 54, 0.12);
}

/* ========== FILTROS ========== */
.filters-bar {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    margin-bottom: 1.5rem;
    padding: 1rem;
    background: var(--bg-input);
    border-radius: var(--radius);
    align-items: center;
}
.filters-bar label {
    font-size: 0.85rem;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    gap: 6px;
}
.filters-bar select,
.filters-bar input {
    padding: 6px 10px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 6px;
    color: var(--text-primary);
    font-size: 0.85rem;
}
.filters-bar .filter-clear {
    background: transparent;
    border: none;
    color: var(--accent);
    cursor: pointer;
    font-size: 0.85rem;
    padding: 4px 8px;
}

/* ========== BULK ACTIONS ========== */
.bulk-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    margin-bottom: 1rem;
    padding: 0.5rem 0;
}
.bulk-actions button {
    padding: 6px 16px;
    background: var(--bg-input);
    border: 1px solid var(--border);
    border-radius: 6px;
    color: var(--text-primary);
    font-size: 0.85rem;
    cursor: pointer;
    transition: all var(--transition);
}
.bulk-actions button:hover {
    border-color: var(--accent);
}
.bulk-actions .bulk-delete {
    border-color: var(--danger);
    color: var(--danger);
}
.bulk-actions .bulk-delete:hover {
    background: rgba(244, 67, 54, 0.12);
}

/* ========== MODAL ========== */
.modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(4px);
    justify-content: center;
    align-items: center;
    padding: 2rem;
}
.modal.show {
    display: flex;
}
.modal-content {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 2rem;
    max-width: 600px;
    width: 100%;
    max-height: 80vh;
    overflow-y: auto;
    position: relative;
    box-shadow: var(--shadow);
}
.modal-close {
    position: absolute;
    right: 1.5rem;
    top: 1rem;
    font-size: 1.8rem;
    color: var(--text-secondary);
    cursor: pointer;
    transition: color var(--transition);
}
.modal-close:hover {
    color: var(--text-primary);
}
.modal-content h2 {
    color: var(--accent);
    margin-bottom: 1.5rem;
    font-weight: 500;
}
.modal-content .detail-item {
    display: flex;
    padding: 8px 0;
    border-bottom: 1px solid var(--border);
}
.modal-content .detail-item .label {
    font-weight: 500;
    color: var(--text-secondary);
    width: 160px;
    flex-shrink: 0;
}
.modal-content .detail-item .value {
    color: var(--text-primary);
    word-break: break-word;
}

/* ========== TOAST ========== */
#toast {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    background: var(--bg-card);
    color: var(--text-primary);
    padding: 12px 24px;
    border-radius: 8px;
    font-size: 0.95rem;
    box-shadow: var(--shadow);
    opacity: 0;
    transform: translateY(12px);
    transition: opacity 0.3s ease, transform 0.3s ease;
    pointer-events: none;
    z-index: 999;
    border: 1px solid var(--border);
}
#toast.show {
    opacity: 1;
    transform: translateY(0);
}
#toast.success {
    border-color: var(--success);
    background: #1e3a1e;
}
#toast.error {
    border-color: var(--danger);
    background: #3a1e1e;
}

/* ========== UTILITY ========== */
.field-error {
    color: var(--danger);
    font-size: 0.85rem;
    margin-top: 6px;
    display: none;
}
.field-error.visible {
    display: block;
}
input.invalid,
select.invalid,
textarea.invalid {
    border-color: var(--danger) !important;
}
.hidden {
    display: none !important;
}

/* ========== RESPONSIVE ========== */
@media (max-width: 600px) {
    #app {
        padding: 1.5rem 1.2rem;
    }
    .survey-title h1 {
        font-size: 1.4rem;
    }
    #question-container {
        padding: 1.25rem 1rem;
    }
    #question-container .q-text {
        font-size: 1rem;
    }
    .nav-btn {
        padding: 10px 16px;
        min-width: 80px;
        font-size: 0.85rem;
    }
    #navigation {
        gap: 0.5rem;
    }
    #toast {
        bottom: 1rem;
        right: 1rem;
        left: 1rem;
        text-align: center;
    }
    .options.inline {
        flex-direction: column;
    }
    .responses-grid {
        grid-template-columns: 1fr;
    }
    .filters-bar {
        flex-direction: column;
        align-items: stretch;
    }
    .modal-content {
        padding: 1.5rem;
        margin: 1rem;
    }
    .modal-content .detail-item {
        flex-direction: column;
        padding: 12px 0;
    }
    .modal-content .detail-item .label {
        width: 100%;
        margin-bottom: 4px;
    }
    #admin-actions {
        flex-direction: column;
    }
    .admin-btn {
        width: 100%;
        text-align: center;
    }
}

@media (max-width: 400px) {
    #app {
        padding: 1rem 0.8rem;
    }
    .nav-btn {
        padding: 8px 12px;
        min-width: 60px;
        font-size: 0.8rem;
    }
}