/* ============================================
   SurveyPro - Sistema de Encuestas
   Estilos principales
   ============================================ */

:root {
    --primary: #4f46e5;
    --primary-dark: #4338ca;
    --primary-light: #818cf8;
    --secondary: #64748b;
    --success: #22c55e;
    --warning: #f59e0b;
    --danger: #ef4444;
    --info: #3b82f6;
    --gray-50: #f8fafc;
    --gray-100: #f1f5f9;
    --gray-200: #e2e8f0;
    --gray-300: #cbd5e1;
    --gray-400: #94a3b8;
    --gray-500: #64748b;
    --gray-600: #475569;
    --gray-700: #334155;
    --gray-800: #1e293b;
    --gray-900: #0f172a;
    --white: #ffffff;
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow: 0 1px 3px 0 rgb(0 0 0 / 0.1), 0 1px 2px -1px rgb(0 0 0 / 0.1);
    --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);
    --radius: 0.5rem;
    --radius-sm: 0.375rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background: var(--gray-50);
    color: var(--gray-800);
    line-height: 1.5;
    min-height: 100vh;
}

/* ============================================
   BOTONES
   ============================================ */

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    font-size: 0.875rem;
    font-weight: 500;
    border-radius: var(--radius);
    border: 1px solid transparent;
    cursor: pointer;
    transition: all 0.2s;
    text-decoration: none;
}

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

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

.btn-primary:hover {
    background: var(--primary-dark);
}

.btn-secondary {
    background: var(--white);
    color: var(--gray-700);
    border-color: var(--gray-300);
}

.btn-secondary:hover {
    background: var(--gray-50);
}

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

.btn-danger:hover {
    background: #dc2626;
}

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

.btn-sm {
    padding: 0.375rem 0.75rem;
    font-size: 0.8125rem;
}

.btn-lg {
    padding: 0.75rem 1.5rem;
    font-size: 1rem;
}

.btn-block {
    width: 100%;
}

/* ============================================
   FORMULARIOS
   ============================================ */

.form-group {
    margin-bottom: 1rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.375rem;
    font-weight: 500;
    font-size: 0.875rem;
    color: var(--gray-700);
}

.form-group input,
.form-group textarea,
.form-group select {
    width: 100%;
    padding: 0.625rem 0.875rem;
    font-size: 0.875rem;
    border: 1px solid var(--gray-300);
    border-radius: var(--radius);
    background: var(--white);
    transition: border-color 0.2s, box-shadow 0.2s;
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.1);
}

.checkbox-label {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.875rem;
    color: var(--gray-600);
    cursor: pointer;
}

.checkbox-label input[type="checkbox"] {
    width: 1rem;
    height: 1rem;
}

/* ============================================
   AUTH SCREEN
   ============================================ */

.auth-container {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 2rem;
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
}

.auth-box {
    background: var(--white);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-lg);
    width: 100%;
    max-width: 420px;
    padding: 2rem;
}

.auth-header {
    text-align: center;
    margin-bottom: 2rem;
}

.auth-header h1 {
    font-size: 1.875rem;
    color: var(--gray-900);
    margin-bottom: 0.5rem;
}

.auth-header p {
    color: var(--gray-500);
}

.auth-form h2 {
    font-size: 1.25rem;
    margin-bottom: 1.5rem;
    color: var(--gray-800);
}

.auth-switch {
    text-align: center;
    margin-top: 1.5rem;
    font-size: 0.875rem;
    color: var(--gray-600);
}

.auth-switch a {
    color: var(--primary);
    text-decoration: none;
    font-weight: 500;
}

.auth-switch a:hover {
    text-decoration: underline;
}

.auth-demo {
    text-align: center;
    margin-top: 1rem;
    font-size: 0.8125rem;
    color: var(--gray-400);
    padding-top: 1rem;
    border-top: 1px solid var(--gray-100);
}

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

.app-header {
    background: var(--white);
    border-bottom: 1px solid var(--gray-200);
    padding: 0 1.5rem;
    height: 64px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    position: sticky;
    top: 0;
    z-index: 100;
}

.header-brand h1 {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--primary);
}

.header-nav {
    display: flex;
    gap: 0.5rem;
}

.nav-link {
    padding: 0.5rem 1rem;
    border-radius: var(--radius);
    color: var(--gray-600);
    text-decoration: none;
    font-size: 0.875rem;
    font-weight: 500;
    transition: all 0.2s;
}

.nav-link:hover,
.nav-link.active {
    background: var(--gray-100);
    color: var(--gray-900);
}

.header-user {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.header-user span {
    font-size: 0.875rem;
    color: var(--gray-600);
}

/* ============================================
   MAIN CONTENT
   ============================================ */

.app-main {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem 1.5rem;
}

.page-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 2rem;
}

.page-header h2 {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--gray-900);
}

.page-header p {
    color: var(--gray-500);
    margin-top: 0.25rem;
}

.header-actions {
    display: flex;
    gap: 0.75rem;
}

/* ============================================
   DASHBOARD
   ============================================ */

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 1rem;
    margin-bottom: 2rem;
}

.stat-card {
    background: var(--white);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    box-shadow: var(--shadow);
    border: 1px solid var(--gray-200);
}

.stat-card h3 {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--gray-500);
    margin-bottom: 0.5rem;
}

.stat-card .stat-value {
    font-size: 2rem;
    font-weight: 700;
    color: var(--gray-900);
}

.stat-card .stat-change {
    font-size: 0.8125rem;
    color: var(--success);
    margin-top: 0.25rem;
}

.recent-surveys h3 {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: var(--gray-800);
}

/* ============================================
   SURVEY CARDS
   ============================================ */

.survey-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 1rem;
}

.survey-card {
    background: var(--white);
    border-radius: var(--radius-lg);
    padding: 1.25rem;
    box-shadow: var(--shadow);
    border: 1px solid var(--gray-200);
    transition: box-shadow 0.2s, transform 0.2s;
}

.survey-card:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

.survey-card-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 0.75rem;
}

.survey-card h4 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--gray-900);
    margin-bottom: 0.25rem;
}

.survey-card p {
    font-size: 0.875rem;
    color: var(--gray-500);
    margin-bottom: 1rem;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.survey-meta {
    display: flex;
    gap: 1rem;
    font-size: 0.8125rem;
    color: var(--gray-500);
    margin-bottom: 1rem;
}

.survey-meta span {
    display: flex;
    align-items: center;
    gap: 0.25rem;
}

.badge {
    display: inline-flex;
    align-items: center;
    padding: 0.25rem 0.625rem;
    border-radius: 9999px;
    font-size: 0.75rem;
    font-weight: 500;
}

.badge-success {
    background: #dcfce7;
    color: #166534;
}

.badge-gray {
    background: var(--gray-100);
    color: var(--gray-600);
}

.survey-actions {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
}

.survey-actions .btn {
    font-size: 0.8125rem;
    padding: 0.375rem 0.75rem;
}

/* ============================================
   SURVEY BUILDER
   ============================================ */

.builder-container {
    display: grid;
    grid-template-columns: 280px 1fr;
    gap: 1.5rem;
}

.builder-sidebar {
    background: var(--white);
    border-radius: var(--radius-lg);
    padding: 1.25rem;
    box-shadow: var(--shadow);
    border: 1px solid var(--gray-200);
    height: fit-content;
    position: sticky;
    top: 80px;
}

.builder-sidebar h3 {
    font-size: 0.875rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: var(--gray-700);
}

.question-types {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.qtype-btn {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem;
    border: 1px solid var(--gray-200);
    border-radius: var(--radius);
    background: var(--white);
    cursor: pointer;
    font-size: 0.875rem;
    color: var(--gray-700);
    transition: all 0.2s;
    text-align: left;
}

.qtype-btn .qtype-icon {
    flex-shrink: 0;
    font-size: 1rem;
}

.qtype-btn:hover {
    background: var(--gray-50);
    border-color: var(--primary-light);
}

.builder-main {
    background: var(--white);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    box-shadow: var(--shadow);
    border: 1px solid var(--gray-200);
    min-height: 600px;
}

.survey-info {
    margin-bottom: 1.5rem;
    padding-bottom: 1.5rem;
    border-bottom: 1px solid var(--gray-200);
}

.survey-title-input {
    width: 100%;
    font-size: 1.5rem;
    font-weight: 600;
    border: none;
    border-bottom: 2px solid transparent;
    padding: 0.5rem 0;
    margin-bottom: 0.75rem;
    color: var(--gray-900);
}

.survey-title-input:focus {
    outline: none;
    border-bottom-color: var(--primary);
}

.survey-title-input::placeholder {
    color: var(--gray-400);
}

.survey-desc-input {
    width: 100%;
    border: none;
    padding: 0.5rem 0;
    font-size: 0.9375rem;
    color: var(--gray-600);
    resize: none;
    min-height: 60px;
}

.survey-desc-input:focus {
    outline: none;
}

.survey-desc-input::placeholder {
    color: var(--gray-400);
}

.questions-container {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.empty-state {
    text-align: center;
    padding: 3rem;
    color: var(--gray-400);
    font-style: italic;
}

.builder-question {
    background: var(--gray-50);
    border: 1px solid var(--gray-200);
    border-radius: var(--radius);
    padding: 1rem;
}

.builder-question-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.75rem;
}

.builder-question-type {
    font-size: 0.75rem;
    font-weight: 500;
    color: var(--primary);
    text-transform: uppercase;
}

.builder-question-actions {
    display: flex;
    gap: 0.25rem;
}

.builder-question-actions button {
    padding: 0.25rem 0.5rem;
    font-size: 0.75rem;
    background: var(--white);
    border: 1px solid var(--gray-300);
    border-radius: var(--radius-sm);
    cursor: pointer;
    color: var(--gray-600);
}

.builder-question-actions button:hover {
    background: var(--gray-100);
}

.question-input-group {
    margin-bottom: 0.75rem;
}

.question-input-group label {
    display: block;
    font-size: 0.75rem;
    font-weight: 500;
    color: var(--gray-500);
    margin-bottom: 0.25rem;
}

.question-input-group input,
.question-input-group textarea {
    width: 100%;
    padding: 0.5rem 0.75rem;
    border: 1px solid var(--gray-300);
    border-radius: var(--radius-sm);
    font-size: 0.875rem;
}

.question-input-group input:focus,
.question-input-group textarea:focus {
    outline: none;
    border-color: var(--primary);
}

.options-editor {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.option-row {
    display: flex;
    gap: 0.5rem;
    align-items: center;
}

.option-row input {
    flex: 1;
}

.option-row button {
    padding: 0.25rem 0.5rem;
    background: var(--danger);
    color: var(--white);
    border: none;
    border-radius: var(--radius-sm);
    cursor: pointer;
    font-size: 0.75rem;
}

.add-option-btn {
    padding: 0.5rem;
    background: var(--gray-100);
    border: 1px dashed var(--gray-400);
    border-radius: var(--radius-sm);
    cursor: pointer;
    font-size: 0.875rem;
    color: var(--gray-600);
}

.add-option-btn:hover {
    background: var(--gray-200);
}

.scale-settings {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.75rem;
}

/* ============================================
   PUBLIC SURVEY PAGE
   ============================================ */

#public-survey-app {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.public-survey-container {
    flex: 1;
    max-width: 800px;
    width: 100%;
    margin: 0 auto;
    padding: 2rem 1rem;
}

.public-footer {
    text-align: center;
    padding: 2rem;
    color: var(--gray-400);
    font-size: 0.875rem;
}

.public-footer a {
    color: var(--primary);
    text-decoration: none;
}

.loading-state,
.error-state,
.success-state {
    text-align: center;
    padding: 4rem 2rem;
}

.spinner {
    width: 48px;
    height: 48px;
    border: 4px solid var(--gray-200);
    border-top-color: var(--primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: 0 auto 1rem;
}

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

.error-state h1 {
    font-size: 1.5rem;
    color: var(--gray-800);
    margin-bottom: 0.5rem;
}

.error-state p {
    color: var(--gray-500);
}

.success-state .success-icon {
    font-size: 4rem;
    margin-bottom: 1rem;
}

.success-state h2 {
    font-size: 1.5rem;
    color: var(--gray-800);
    margin-bottom: 0.5rem;
}

.success-state p {
    color: var(--gray-500);
}

.survey-header {
    margin-bottom: 2rem;
    padding-bottom: 1.5rem;
    border-bottom: 1px solid var(--gray-200);
}

.survey-header h1 {
    font-size: 1.75rem;
    color: var(--gray-900);
    margin-bottom: 0.5rem;
}

.survey-header p {
    color: var(--gray-600);
    margin-bottom: 0.5rem;
}

.survey-author {
    font-size: 0.875rem;
    color: var(--gray-500);
}

.question-item {
    background: var(--white);
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-lg);
    padding: 1.25rem;
    margin-bottom: 1rem;
}

.question-header {
    margin-bottom: 0.75rem;
}

.question-title {
    font-weight: 600;
    color: var(--gray-900);
    display: block;
    margin-bottom: 0.25rem;
}

.required {
    color: var(--danger);
}

.question-desc {
    font-size: 0.875rem;
    color: var(--gray-500);
}

.question-input .form-input,
.question-input .form-textarea {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid var(--gray-300);
    border-radius: var(--radius);
    font-size: 0.9375rem;
}

.question-input .form-textarea {
    resize: vertical;
    min-height: 100px;
}

.options-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.option-label {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.75rem;
    background: var(--gray-50);
    border-radius: var(--radius);
    cursor: pointer;
    transition: background 0.2s;
}

.option-label:hover {
    background: var(--gray-100);
}

.option-label input {
    width: 1.125rem;
    height: 1.125rem;
}

.scale-container {
    padding: 1rem;
    background: var(--gray-50);
    border-radius: var(--radius);
}

.scale-labels {
    display: flex;
    justify-content: space-between;
    font-size: 0.75rem;
    color: var(--gray-500);
    margin-bottom: 0.75rem;
}

.scale-options {
    display: flex;
    justify-content: center;
    gap: 0.5rem;
}

.scale-option {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.25rem;
    cursor: pointer;
}

.scale-option input {
    width: 1.25rem;
    height: 1.25rem;
}

.scale-option span {
    font-size: 0.75rem;
    font-weight: 500;
    color: var(--gray-600);
}

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

.stats-container {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.stat-question-card {
    background: var(--white);
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
}

.stat-question-header {
    margin-bottom: 1rem;
}

.stat-question-header h4 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--gray-900);
}

.stat-question-header span {
    font-size: 0.75rem;
    color: var(--gray-500);
    text-transform: uppercase;
}

.stat-bar {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 0.75rem;
}

.stat-bar-label {
    width: 120px;
    font-size: 0.875rem;
    color: var(--gray-700);
    flex-shrink: 0;
}

.stat-bar-track {
    flex: 1;
    height: 24px;
    background: var(--gray-100);
    border-radius: var(--radius-sm);
    overflow: hidden;
}

.stat-bar-fill {
    height: 100%;
    background: var(--primary);
    border-radius: var(--radius-sm);
    transition: width 0.5s ease;
}

.stat-bar-value {
    width: 80px;
    text-align: right;
    font-size: 0.875rem;
    color: var(--gray-600);
    flex-shrink: 0;
}

.stat-summary {
    display: flex;
    gap: 2rem;
    margin-top: 1rem;
    padding-top: 1rem;
    border-top: 1px solid var(--gray-100);
}

.stat-summary-item {
    text-align: center;
}

.stat-summary-item .value {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--gray-900);
}

.stat-summary-item .label {
    font-size: 0.75rem;
    color: var(--gray-500);
    text-transform: uppercase;
}

.responses-list {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    max-height: 300px;
    overflow-y: auto;
}

.response-item {
    padding: 0.75rem;
    background: var(--gray-50);
    border-radius: var(--radius);
    font-size: 0.875rem;
    color: var(--gray-700);
}

/* ============================================
   TOAST NOTIFICATIONS
   ============================================ */

.toast-container {
    position: fixed;
    top: 1rem;
    right: 1rem;
    z-index: 1000;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.toast {
    padding: 1rem 1.25rem;
    border-radius: var(--radius);
    background: var(--gray-800);
    color: var(--white);
    font-size: 0.875rem;
    box-shadow: var(--shadow-lg);
    opacity: 0;
    transform: translateX(100%);
    transition: all 0.3s ease;
    min-width: 280px;
}

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

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

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

.toast-warning {
    background: var(--warning);
}

/* ============================================
   MODAL
   ============================================ */

.modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 200;
    opacity: 0;
    visibility: hidden;
    transition: all 0.2s;
}

.modal-overlay.active {
    opacity: 1;
    visibility: visible;
}

.modal {
    background: var(--white);
    border-radius: var(--radius-lg);
    width: 90%;
    max-width: 600px;
    max-height: 90vh;
    overflow: hidden;
    transform: scale(0.95);
    transition: transform 0.2s;
}

.modal-overlay.active .modal {
    transform: scale(1);
}

.modal-header {
    padding: 1.25rem;
    border-bottom: 1px solid var(--gray-200);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.modal-header h3 {
    font-size: 1.125rem;
    font-weight: 600;
}

.modal-close {
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--gray-400);
}

.modal-close:hover {
    color: var(--gray-600);
}

.modal-body {
    padding: 1.25rem;
    max-height: 60vh;
    overflow-y: auto;
}

.modal-footer {
    padding: 1rem 1.25rem;
    border-top: 1px solid var(--gray-200);
    display: flex;
    justify-content: flex-end;
    gap: 0.75rem;
}

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

@media (max-width: 768px) {
    .app-header {
        flex-wrap: wrap;
        height: auto;
        padding: 0.75rem 1rem;
        gap: 0.75rem;
    }
    
    .header-nav {
        order: 3;
        width: 100%;
        justify-content: center;
        padding-top: 0.5rem;
        border-top: 1px solid var(--gray-200);
    }
    
    .app-main {
        padding: 1rem;
    }
    
    .page-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 1rem;
    }
    
    .builder-container {
        grid-template-columns: 1fr;
    }
    
    .builder-sidebar {
        position: static;
    }
    
    .question-types {
        display: grid;
        grid-template-columns: repeat(2, 1fr);
    }
    
    .survey-grid {
        grid-template-columns: 1fr;
    }
    
    .stats-grid {
        grid-template-columns: 1fr 1fr;
    }
}

@media (max-width: 480px) {
    .stats-grid {
        grid-template-columns: 1fr;
    }
    
    .survey-actions {
        flex-direction: column;
    }
    
    .survey-actions .btn {
        width: 100%;
    }
}