/* ============================================
   Asistente Nutricion Infantil — Regenera Clinic
   ============================================ */

:root {
    --color-primary: #4CAF50;
    --color-primary-dark: #388E3C;
    --color-primary-light: #C8E6C9;
    --color-accent: #FF9800;
    --color-accent-light: #FFE0B2;
    --color-bg: #FAFAFA;
    --color-surface: #FFFFFF;
    --color-text: #212121;
    --color-text-secondary: #757575;
    --color-border: #E0E0E0;
    --color-error: #D32F2F;
    --color-success: #2E7D32;
    --color-warning: #F57F17;
    --color-user-bubble: #E8F5E9;
    --color-bot-bubble: #FFFFFF;
    --radius: 12px;
    --radius-sm: 8px;
    --shadow: 0 2px 8px rgba(0,0,0,0.08);
    --shadow-lg: 0 4px 16px rgba(0,0,0,0.12);
    --max-width: 480px;
    --header-height: 56px;
    --input-height: 56px;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--color-bg);
    color: var(--color-text);
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
}

/* Layout */
.app-container {
    max-width: var(--max-width);
    margin: 0 auto;
    min-height: 100dvh;
    display: flex;
    flex-direction: column;
    background: var(--color-surface);
    position: relative;
}

/* Header */
.header {
    background: var(--color-primary);
    color: white;
    padding: 0 16px;
    height: var(--header-height);
    display: flex;
    align-items: center;
    justify-content: space-between;
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: var(--shadow);
}

.header h1 {
    font-size: 16px;
    font-weight: 600;
}

.header-info {
    font-size: 11px;
    opacity: 0.9;
}

.header-btn {
    background: none;
    border: none;
    color: white;
    font-size: 20px;
    cursor: pointer;
    padding: 8px;
    border-radius: 50%;
    transition: background 0.2s;
}

.header-btn:hover {
    background: rgba(255,255,255,0.15);
}

/* Secciones */
.seccion {
    display: none;
    flex: 1;
    flex-direction: column;
}

.seccion.activa {
    display: flex;
}

/* ---- Landing / Login / Registro ---- */
.auth-container {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 32px 24px;
    text-align: center;
}

.auth-logo {
    width: 80px;
    height: 80px;
    background: var(--color-primary-light);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 40px;
    margin-bottom: 16px;
}

.auth-title {
    font-size: 22px;
    font-weight: 700;
    margin-bottom: 8px;
    color: var(--color-primary-dark);
}

.auth-subtitle {
    font-size: 14px;
    color: var(--color-text-secondary);
    margin-bottom: 32px;
    max-width: 300px;
}

/* Forms */
.form-group {
    width: 100%;
    max-width: 320px;
    margin-bottom: 16px;
    text-align: left;
}

.form-group label {
    display: block;
    font-size: 13px;
    font-weight: 600;
    margin-bottom: 4px;
    color: var(--color-text-secondary);
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 12px;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    font-size: 15px;
    transition: border-color 0.2s;
    background: var(--color-surface);
}

.form-group input:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px var(--color-primary-light);
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 12px 24px;
    border: none;
    border-radius: var(--radius-sm);
    font-size: 15px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
    width: 100%;
    max-width: 320px;
}

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

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

.btn-primary:disabled {
    background: #bbb;
    cursor: not-allowed;
}

.btn-outline {
    background: transparent;
    color: var(--color-primary);
    border: 2px solid var(--color-primary);
}

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

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

.link-btn {
    background: none;
    border: none;
    color: var(--color-primary);
    font-size: 14px;
    cursor: pointer;
    margin-top: 16px;
    text-decoration: underline;
}

.error-msg {
    color: var(--color-error);
    font-size: 13px;
    margin-top: 8px;
    display: none;
}

.error-msg.visible {
    display: block;
}

.success-msg {
    color: var(--color-success);
    font-size: 13px;
    padding: 8px 12px;
    background: #E8F5E9;
    border-radius: var(--radius-sm);
    margin-bottom: 12px;
}

/* ---- Onboarding ---- */
.onboarding {
    padding: 24px;
    overflow-y: auto;
}

.onboarding h2 {
    font-size: 20px;
    margin-bottom: 4px;
}

.onboarding p {
    color: var(--color-text-secondary);
    font-size: 14px;
    margin-bottom: 24px;
}

.step-indicator {
    display: flex;
    gap: 8px;
    margin-bottom: 24px;
}

.step-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--color-border);
}

.step-dot.active {
    background: var(--color-primary);
    width: 24px;
    border-radius: 4px;
}

.checkbox-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 8px;
    margin-bottom: 16px;
}

.checkbox-item {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 8px 12px;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    font-size: 13px;
    cursor: pointer;
    transition: all 0.2s;
}

.checkbox-item.checked {
    background: var(--color-primary-light);
    border-color: var(--color-primary);
}

.checkbox-item input[type="checkbox"] {
    display: none;
}

/* ---- Chat ---- */
.chat-container {
    flex: 1;
    display: flex;
    flex-direction: column;
    height: calc(100dvh - var(--header-height));
}

.chat-messages {
    flex: 1;
    overflow-y: auto;
    padding: 16px;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.message {
    max-width: 85%;
    padding: 12px 16px;
    border-radius: var(--radius);
    font-size: 14px;
    line-height: 1.6;
    word-wrap: break-word;
}

.message.user {
    align-self: flex-end;
    background: var(--color-user-bubble);
    border-bottom-right-radius: 4px;
}

.message.assistant {
    align-self: flex-start;
    background: var(--color-bot-bubble);
    border: 1px solid var(--color-border);
    border-bottom-left-radius: 4px;
}

.message.assistant strong {
    color: var(--color-primary-dark);
}

.message.assistant ul,
.message.assistant ol {
    margin: 8px 0;
    padding-left: 20px;
}

.message.assistant li {
    margin-bottom: 4px;
}

.message-typing {
    display: flex;
    gap: 4px;
    padding: 16px;
    align-self: flex-start;
}

.message-typing span {
    width: 8px;
    height: 8px;
    background: var(--color-text-secondary);
    border-radius: 50%;
    animation: typing 1.2s infinite;
}

.message-typing span:nth-child(2) { animation-delay: 0.2s; }
.message-typing span:nth-child(3) { animation-delay: 0.4s; }

@keyframes typing {
    0%, 60%, 100% { opacity: 0.3; transform: scale(0.8); }
    30% { opacity: 1; transform: scale(1); }
}

/* Chat input */
.chat-input-area {
    padding: 12px 16px;
    border-top: 1px solid var(--color-border);
    background: var(--color-surface);
    display: flex;
    gap: 8px;
    align-items: flex-end;
}

.chat-input-area textarea {
    flex: 1;
    border: 1px solid var(--color-border);
    border-radius: 20px;
    padding: 10px 16px;
    font-size: 15px;
    resize: none;
    max-height: 120px;
    line-height: 1.4;
    font-family: inherit;
}

.chat-input-area textarea:focus {
    outline: none;
    border-color: var(--color-primary);
}

.chat-send-btn {
    width: 42px;
    height: 42px;
    border-radius: 50%;
    background: var(--color-primary);
    color: white;
    border: none;
    cursor: pointer;
    font-size: 18px;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    transition: background 0.2s;
}

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

.chat-send-btn:disabled {
    background: #ccc;
    cursor: not-allowed;
}

/* ---- Nav inferior ---- */
.nav-bottom {
    display: flex;
    border-top: 1px solid var(--color-border);
    background: var(--color-surface);
    position: sticky;
    bottom: 0;
}

.nav-item {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 8px 0;
    font-size: 10px;
    color: var(--color-text-secondary);
    cursor: pointer;
    border: none;
    background: none;
    transition: color 0.2s;
    gap: 2px;
}

.nav-item .nav-icon {
    font-size: 20px;
}

.nav-item.active {
    color: var(--color-primary);
}

/* ---- Guia semanal ---- */
.guia-container {
    flex: 1;
    overflow-y: auto;
    padding: 20px;
}

.guia-header {
    text-align: center;
    margin-bottom: 24px;
}

.guia-fase {
    display: inline-block;
    background: var(--color-primary-light);
    color: var(--color-primary-dark);
    padding: 4px 12px;
    border-radius: 16px;
    font-size: 12px;
    font-weight: 600;
    margin-bottom: 8px;
}

.guia-titulo {
    font-size: 18px;
    font-weight: 700;
}

.guia-card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: 16px;
    margin-bottom: 16px;
    box-shadow: var(--shadow);
}

.guia-card h3 {
    font-size: 15px;
    margin-bottom: 8px;
    color: var(--color-primary-dark);
}

.guia-card ul {
    padding-left: 20px;
    font-size: 14px;
}

.guia-card li {
    margin-bottom: 6px;
}

.guia-receta {
    background: var(--color-accent-light);
    border-color: var(--color-accent);
}

.guia-tip {
    background: #E3F2FD;
    border-color: #1976D2;
    font-style: italic;
    font-size: 14px;
}

/* ---- Progreso ---- */
.progreso-container {
    flex: 1;
    overflow-y: auto;
    padding: 20px;
}

.progreso-ring {
    width: 120px;
    height: 120px;
    margin: 0 auto 24px;
    position: relative;
}

.progreso-ring svg {
    transform: rotate(-90deg);
}

.progreso-ring .ring-bg {
    fill: none;
    stroke: var(--color-border);
    stroke-width: 8;
}

.progreso-ring .ring-fill {
    fill: none;
    stroke: var(--color-primary);
    stroke-width: 8;
    stroke-linecap: round;
    transition: stroke-dashoffset 0.6s ease;
}

.progreso-ring .ring-text {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    text-align: center;
}

.progreso-ring .ring-number {
    font-size: 28px;
    font-weight: 700;
    color: var(--color-primary-dark);
    display: block;
}

.progreso-ring .ring-label {
    font-size: 11px;
    color: var(--color-text-secondary);
}

.checklist-section {
    margin-bottom: 24px;
}

.checklist-section h3 {
    font-size: 15px;
    margin-bottom: 12px;
    color: var(--color-primary-dark);
}

.checklist-item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 0;
    border-bottom: 1px solid var(--color-border);
    font-size: 14px;
}

.checklist-check {
    width: 22px;
    height: 22px;
    border: 2px solid var(--color-border);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    cursor: pointer;
    transition: all 0.2s;
}

.checklist-check.done {
    background: var(--color-primary);
    border-color: var(--color-primary);
    color: white;
    font-size: 12px;
}

/* ---- Perfil / Settings ---- */
.perfil-container {
    flex: 1;
    overflow-y: auto;
    padding: 20px;
}

.perfil-card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: 16px;
    margin-bottom: 16px;
}

.perfil-card h3 {
    font-size: 15px;
    margin-bottom: 12px;
    color: var(--color-primary-dark);
}

.perfil-row {
    display: flex;
    justify-content: space-between;
    padding: 8px 0;
    border-bottom: 1px solid var(--color-border);
    font-size: 14px;
}

.perfil-row:last-child {
    border-bottom: none;
}

.perfil-label {
    color: var(--color-text-secondary);
}

.perfil-value {
    font-weight: 600;
}

/* ---- Loading ---- */
.loading {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 40px;
}

.spinner {
    width: 32px;
    height: 32px;
    border: 3px solid var(--color-border);
    border-top-color: var(--color-primary);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

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

/* ---- Responsive ---- */
@media (min-width: 481px) {
    .app-container {
        border-left: 1px solid var(--color-border);
        border-right: 1px solid var(--color-border);
        box-shadow: var(--shadow-lg);
    }
}

/* ---- Plan badge ---- */
.plan-badge {
    display: inline-block;
    padding: 2px 8px;
    border-radius: 10px;
    font-size: 10px;
    font-weight: 700;
    text-transform: uppercase;
    cursor: pointer;
    letter-spacing: 0.5px;
}

.plan-badge.plan-free {
    background: rgba(255,255,255,0.2);
    color: white;
}

.plan-badge.plan-esencial {
    background: var(--color-accent);
    color: white;
}

.plan-badge.plan-premium {
    background: linear-gradient(135deg, #FFD700, #FFA000);
    color: #333;
}

/* ---- Planes / Pricing ---- */
.planes-container {
    flex: 1;
    overflow-y: auto;
    padding: 20px;
}

.planes-header {
    text-align: center;
    margin-bottom: 24px;
}

.planes-header h2 {
    font-size: 20px;
    margin-bottom: 4px;
}

.plan-card {
    border: 2px solid var(--color-border);
    border-radius: var(--radius);
    padding: 20px;
    margin-bottom: 16px;
    position: relative;
    transition: border-color 0.2s;
}

.plan-card.plan-actual {
    border-color: var(--color-primary);
}

.plan-card.plan-destacado {
    border-color: var(--color-accent);
    box-shadow: var(--shadow-lg);
}

.plan-card-badge {
    position: absolute;
    top: -10px;
    right: 16px;
    background: var(--color-accent);
    color: white;
    padding: 2px 10px;
    border-radius: 10px;
    font-size: 11px;
    font-weight: 700;
}

.plan-card h3 {
    font-size: 17px;
    margin-bottom: 4px;
}

.plan-card .plan-precio {
    font-size: 28px;
    font-weight: 800;
    color: var(--color-primary-dark);
    margin-bottom: 4px;
}

.plan-card .plan-precio span {
    font-size: 14px;
    font-weight: 400;
    color: var(--color-text-secondary);
}

.plan-card .plan-features {
    list-style: none;
    padding: 0;
    margin: 12px 0 16px;
    font-size: 13px;
}

.plan-card .plan-features li {
    padding: 4px 0;
}

.plan-card .plan-features li::before {
    content: "✓ ";
    color: var(--color-primary);
    font-weight: 700;
}

.plan-card .plan-features li.disabled {
    color: var(--color-text-secondary);
    text-decoration: line-through;
}

.plan-card .plan-features li.disabled::before {
    content: "— ";
    color: var(--color-text-secondary);
}

/* ---- Upgrade banner ---- */
.upgrade-banner {
    background: linear-gradient(135deg, #FFF3E0, #FFE0B2);
    border: 1px solid var(--color-accent);
    border-radius: var(--radius);
    padding: 12px 16px;
    margin: 8px 16px;
    font-size: 13px;
    display: flex;
    align-items: center;
    gap: 8px;
    cursor: pointer;
}

.upgrade-banner:hover {
    background: var(--color-accent-light);
}

/* ---- Chat limit counter ---- */
.chat-limit {
    text-align: center;
    font-size: 11px;
    color: var(--color-text-secondary);
    padding: 4px 0;
}

/* ---- Utilidades ---- */
.hidden { display: none !important; }
.mb-8 { margin-bottom: 8px; }
.mb-16 { margin-bottom: 16px; }
.mb-24 { margin-bottom: 24px; }
.text-center { text-align: center; }
.text-sm { font-size: 13px; }
.text-muted { color: var(--color-text-secondary); }