/* ============================================
   YODAI - Estilos principales
   ============================================ */

/* ── Reset y Base ── */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --color-bg: #f5f0eb;
    --color-bg-dark: #1a1a1a;
    --color-text: #1a1a1a;
    --color-text-light: #666;
    --color-text-muted: #999;
    --color-accent: #2d2d2d;
    --color-white: #fff;
    --color-border: #ddd;
    --color-success: #22c55e;
    --color-warning: #f59e0b;
    --color-danger: #ef4444;
    --font-serif: 'Playfair Display', Georgia, 'Times New Roman', serif;
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
    --max-width: 1200px;
    --nav-height: 70px;
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: var(--font-sans);
    background-color: var(--color-bg);
    color: var(--color-text);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

a {
    color: inherit;
    text-decoration: none;
}

img {
    max-width: 100%;
    height: auto;
}

/* ── Navegación ── */
.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--nav-height);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 40px;
    z-index: 1000;
    background: rgba(245, 240, 235, 0.95);
    backdrop-filter: blur(10px);
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: 8px;
    font-family: var(--font-sans);
    font-size: 14px;
    font-weight: 600;
    letter-spacing: 2px;
    text-transform: uppercase;
}

.nav-logo svg {
    width: 28px;
    height: 28px;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 32px;
    list-style: none;
}

.nav-links a {
    font-size: 14px;
    font-weight: 400;
    color: var(--color-text);
    transition: opacity 0.2s;
}

.nav-links a:hover {
    opacity: 0.6;
}

.nav-links .btn-nav {
    background: var(--color-bg-dark);
    color: var(--color-white);
    padding: 10px 24px;
    border-radius: 6px;
    font-size: 13px;
    font-weight: 500;
    transition: opacity 0.2s;
}

.nav-links .btn-nav:hover {
    opacity: 0.85;
}

/* ── Hero ── */
.hero {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    padding: 120px 40px 80px;
}

.hero-label {
    font-size: 11px;
    font-weight: 500;
    letter-spacing: 4px;
    text-transform: uppercase;
    color: var(--color-text-light);
    margin-bottom: 40px;
}

.hero h1 {
    font-family: var(--font-serif);
    font-size: clamp(2.5rem, 5vw, 4rem);
    font-weight: 400;
    font-style: italic;
    line-height: 1.2;
    max-width: 800px;
    margin-bottom: 32px;
}

.hero-subtitle {
    font-size: 14px;
    font-style: italic;
    color: var(--color-text-light);
    max-width: 600px;
    margin-bottom: 16px;
}

.hero-desc {
    font-size: 14px;
    color: var(--color-text-light);
    max-width: 600px;
    line-height: 1.7;
}

/* ── Secciones ── */
.section {
    padding: 100px 40px;
    max-width: var(--max-width);
    margin: 0 auto;
}

.section-divider {
    display: flex;
    align-items: center;
    gap: 20px;
    margin-bottom: 60px;
}

.section-divider::before,
.section-divider::after {
    content: '';
    flex: 1;
    height: 1px;
    background: var(--color-border);
}

.section-divider span {
    font-size: 11px;
    font-weight: 500;
    letter-spacing: 4px;
    text-transform: uppercase;
    color: var(--color-text-muted);
    white-space: nowrap;
}

.section-title {
    font-family: var(--font-serif);
    font-size: clamp(1.8rem, 3.5vw, 2.8rem);
    font-weight: 400;
    line-height: 1.3;
    margin-bottom: 24px;
}

.section-subtitle {
    font-size: 15px;
    color: var(--color-text-light);
    max-width: 600px;
    line-height: 1.7;
    margin-bottom: 40px;
}

/* ── Información ── */
.info-block {
    max-width: 700px;
    margin: 0 auto 60px;
}

.info-block h3 {
    font-family: var(--font-serif);
    font-size: 1.5rem;
    font-weight: 400;
    margin-bottom: 16px;
}

.info-block p {
    font-size: 15px;
    color: var(--color-text-light);
    line-height: 1.8;
}

.info-block .highlight {
    font-weight: 600;
    color: var(--color-text);
}

/* ── FAQ / Acordeón ── */
.faq-container {
    max-width: 800px;
    margin: 0 auto;
}

.faq-item {
    border-bottom: 1px solid var(--color-border);
    padding: 20px 0;
    cursor: pointer;
}

.faq-question {
    display: flex;
    align-items: flex-start;
    gap: 16px;
    font-size: 15px;
    font-weight: 500;
}

.faq-number {
    font-family: var(--font-mono);
    font-size: 12px;
    color: var(--color-text-muted);
    min-width: 24px;
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease, padding 0.3s ease;
    padding-left: 40px;
}

.faq-answer p {
    font-size: 14px;
    color: var(--color-text-light);
    line-height: 1.7;
    padding-top: 12px;
}

.faq-item.active .faq-answer {
    max-height: 200px;
}

/* ── Niveles de uso ── */
.levels-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 32px;
    margin-top: 48px;
}

.level-card {
    background: var(--color-white);
    border-radius: 12px;
    padding: 40px 32px;
    transition: transform 0.2s;
}

.level-card:hover {
    transform: translateY(-4px);
}

.level-number {
    font-family: var(--font-serif);
    font-size: 3rem;
    font-weight: 300;
    color: var(--color-text-muted);
    margin-bottom: 16px;
}

.level-card h3 {
    font-family: var(--font-serif);
    font-size: 1.3rem;
    font-weight: 400;
    margin-bottom: 8px;
}

.level-tag {
    font-size: 10px;
    font-weight: 600;
    letter-spacing: 2px;
    text-transform: uppercase;
    color: var(--color-text-muted);
    margin-bottom: 20px;
    display: block;
}

.level-card p {
    font-size: 14px;
    color: var(--color-text-light);
    line-height: 1.7;
}

/* ── Planes y Precios ── */
.pricing-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
    margin-top: 40px;
}

.pricing-card {
    background: var(--color-white);
    border-radius: 12px;
    padding: 32px;
    display: flex;
    flex-direction: column;
}

.pricing-card.featured {
    border: 2px solid var(--color-bg-dark);
}

.pricing-label {
    font-size: 11px;
    font-weight: 600;
    letter-spacing: 2px;
    text-transform: uppercase;
    color: var(--color-text-muted);
    margin-bottom: 8px;
}

.pricing-card h3 {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 4px;
}

.pricing-detail {
    font-size: 13px;
    color: var(--color-text-muted);
    margin-bottom: 16px;
}

.pricing-price {
    font-family: var(--font-serif);
    font-size: 2rem;
    font-weight: 400;
    margin-bottom: 4px;
}

.pricing-unit {
    font-size: 13px;
    color: var(--color-text-muted);
    margin-bottom: 20px;
}

.pricing-savings {
    font-size: 12px;
    color: var(--color-success);
    font-weight: 600;
    margin-bottom: 16px;
}

/* ── Suscripciones ── */
.sub-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
    margin-top: 40px;
}

.sub-card {
    background: var(--color-white);
    border-radius: 12px;
    padding: 28px 24px;
    text-align: center;
}

.sub-card h4 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 4px;
}

.sub-card .sub-type {
    font-size: 12px;
    color: var(--color-text-muted);
    margin-bottom: 16px;
}

.sub-card .sub-price {
    font-family: var(--font-serif);
    font-size: 1.8rem;
    font-weight: 400;
    margin-bottom: 16px;
}

/* ── Botones ── */
.btn {
    display: inline-block;
    padding: 14px 32px;
    border-radius: 8px;
    font-size: 14px;
    font-weight: 500;
    text-align: center;
    cursor: pointer;
    border: none;
    transition: all 0.2s;
    text-decoration: none;
}

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

.btn-primary:hover {
    opacity: 0.85;
}

.btn-outline {
    background: transparent;
    color: var(--color-text);
    border: 1px solid var(--color-border);
}

.btn-outline:hover {
    background: var(--color-text);
    color: var(--color-white);
}

.btn-block {
    display: block;
    width: 100%;
}

/* ── Test y Beta Cards ── */
.promo-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 32px;
    margin-top: 48px;
}

.promo-card {
    background: var(--color-white);
    border-radius: 16px;
    padding: 48px 40px;
}

.promo-card .promo-tag {
    font-size: 10px;
    font-weight: 600;
    letter-spacing: 2px;
    text-transform: uppercase;
    color: var(--color-text-muted);
    margin-bottom: 12px;
    display: block;
}

.promo-card h3 {
    font-family: var(--font-serif);
    font-size: 1.5rem;
    font-weight: 400;
    margin-bottom: 8px;
}

.promo-card .promo-desc {
    font-size: 14px;
    color: var(--color-text-light);
    margin-bottom: 20px;
}

.promo-price {
    font-family: var(--font-serif);
    font-size: 2.5rem;
    font-weight: 400;
    margin-bottom: 4px;
}

.promo-price-note {
    font-size: 13px;
    color: var(--color-text-muted);
    margin-bottom: 24px;
}

.promo-features {
    list-style: none;
    margin-bottom: 28px;
}

.promo-features li {
    font-size: 14px;
    color: var(--color-text-light);
    padding: 6px 0;
    padding-left: 20px;
    position: relative;
}

.promo-features li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--color-text-muted);
    font-size: 12px;
}

/* ── Líderes ── */
.leaders-section {
    background: var(--color-bg-dark);
    color: var(--color-white);
    padding: 100px 40px;
}

.leaders-section .section-title {
    color: var(--color-white);
}

.leaders-section p {
    color: rgba(255,255,255,0.7);
}

.leaders-features {
    list-style: none;
    margin: 32px 0;
}

.leaders-features li {
    font-size: 14px;
    color: rgba(255,255,255,0.7);
    padding: 8px 0;
    padding-left: 24px;
    position: relative;
}

.leaders-features li::before {
    content: '→';
    position: absolute;
    left: 0;
}

.leaders-pricing {
    background: rgba(255,255,255,0.05);
    border: 1px solid rgba(255,255,255,0.1);
    border-radius: 16px;
    padding: 48px;
    max-width: 600px;
    margin-top: 48px;
}

.leaders-pricing .lp-tag {
    font-size: 10px;
    font-weight: 600;
    letter-spacing: 2px;
    text-transform: uppercase;
    color: rgba(255,255,255,0.5);
    margin-bottom: 12px;
    display: block;
}

.leaders-pricing h3 {
    font-size: 1.3rem;
    font-weight: 500;
    margin-bottom: 8px;
}

.leaders-pricing .lp-note {
    font-size: 13px;
    color: rgba(255,255,255,0.5);
    margin-bottom: 20px;
}

.leaders-pricing .lp-price {
    font-family: var(--font-serif);
    font-size: 3rem;
    font-weight: 400;
    margin-bottom: 4px;
}

.leaders-pricing .lp-detail {
    font-size: 13px;
    color: rgba(255,255,255,0.5);
    margin-bottom: 24px;
}

.leaders-phases {
    list-style: none;
    margin: 24px 0 32px;
}

.leaders-phases li {
    display: flex;
    justify-content: space-between;
    font-size: 14px;
    padding: 8px 0;
    border-bottom: 1px solid rgba(255,255,255,0.1);
}

.leaders-phases li span:last-child {
    color: rgba(255,255,255,0.5);
}

.btn-light {
    background: var(--color-white);
    color: var(--color-bg-dark);
    padding: 14px 32px;
    border-radius: 8px;
    font-size: 14px;
    font-weight: 500;
}

/* ── Footer ── */
.footer {
    text-align: center;
    padding: 80px 40px;
    max-width: var(--max-width);
    margin: 0 auto;
}

.footer-quote {
    font-family: var(--font-serif);
    font-size: clamp(1.2rem, 2.5vw, 1.8rem);
    font-style: italic;
    font-weight: 400;
    max-width: 700px;
    margin: 0 auto 24px;
    line-height: 1.4;
}

.footer-desc {
    font-size: 14px;
    color: var(--color-text-light);
    max-width: 500px;
    margin: 0 auto 32px;
}

.footer-bottom {
    margin-top: 60px;
    padding-top: 24px;
    border-top: 1px solid var(--color-border);
    font-size: 12px;
    color: var(--color-text-muted);
}

/* ── Formularios (Auth) ── */
.auth-container {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 40px;
}

.auth-card {
    background: var(--color-white);
    border-radius: 16px;
    padding: 48px;
    width: 100%;
    max-width: 440px;
    box-shadow: 0 4px 24px rgba(0,0,0,0.06);
}

.auth-card h2 {
    font-family: var(--font-serif);
    font-size: 1.8rem;
    font-weight: 400;
    margin-bottom: 8px;
}

.auth-card .auth-subtitle {
    font-size: 14px;
    color: var(--color-text-light);
    margin-bottom: 32px;
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    font-size: 13px;
    font-weight: 500;
    margin-bottom: 6px;
}

.form-group input {
    width: 100%;
    padding: 12px 16px;
    border: 1px solid var(--color-border);
    border-radius: 8px;
    font-size: 14px;
    font-family: var(--font-sans);
    transition: border-color 0.2s;
}

.form-group input:focus {
    outline: none;
    border-color: var(--color-text);
}

.form-error {
    background: #fef2f2;
    color: var(--color-danger);
    padding: 12px 16px;
    border-radius: 8px;
    font-size: 13px;
    margin-bottom: 20px;
}

.form-success {
    background: #f0fdf4;
    color: var(--color-success);
    padding: 12px 16px;
    border-radius: 8px;
    font-size: 13px;
    margin-bottom: 20px;
}

.auth-footer {
    text-align: center;
    margin-top: 24px;
    font-size: 13px;
    color: var(--color-text-light);
}

.auth-footer a {
    color: var(--color-text);
    font-weight: 500;
}

/* ── Dashboard ── */
.dashboard {
    padding-top: calc(var(--nav-height) + 40px);
    max-width: var(--max-width);
    margin: 0 auto;
    padding-left: 40px;
    padding-right: 40px;
    padding-bottom: 80px;
}

.dash-header {
    margin-bottom: 48px;
}

.dash-header h1 {
    font-family: var(--font-serif);
    font-size: 2rem;
    font-weight: 400;
    margin-bottom: 8px;
}

.dash-header p {
    font-size: 14px;
    color: var(--color-text-light);
}

.dash-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
    margin-bottom: 48px;
}

.stat-card {
    background: var(--color-white);
    border-radius: 12px;
    padding: 28px;
}

.stat-card .stat-label {
    font-size: 12px;
    font-weight: 500;
    letter-spacing: 1px;
    text-transform: uppercase;
    color: var(--color-text-muted);
    margin-bottom: 8px;
}

.stat-card .stat-value {
    font-family: var(--font-serif);
    font-size: 2.5rem;
    font-weight: 400;
}

.stat-card .stat-note {
    font-size: 12px;
    color: var(--color-text-muted);
    margin-top: 4px;
}

/* ── Temporizador de Sesión ── */
.session-timer-bar {
    position: fixed;
    top: var(--nav-height);
    left: 0;
    right: 0;
    background: var(--color-bg-dark);
    color: var(--color-white);
    padding: 12px 40px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    z-index: 999;
    font-size: 14px;
}

.timer-display {
    font-family: var(--font-mono);
    font-size: 1.2rem;
    font-weight: 600;
}

.timer-warning {
    color: var(--color-warning);
}

.timer-danger {
    color: var(--color-danger);
    animation: pulse 1s infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

.timer-progress {
    position: absolute;
    bottom: 0;
    left: 0;
    height: 3px;
    background: var(--color-success);
    transition: width 1s linear;
}

/* ── Chat ── */
.chat-container {
    padding-top: calc(var(--nav-height) + 60px);
    max-width: 800px;
    margin: 0 auto;
    padding-left: 40px;
    padding-right: 40px;
    padding-bottom: 120px;
    min-height: 100vh;
}

.chat-messages {
    display: flex;
    flex-direction: column;
    gap: 20px;
    margin-bottom: 24px;
}

.chat-message {
    max-width: 80%;
    padding: 16px 20px;
    border-radius: 16px;
    font-size: 14px;
    line-height: 1.7;
}

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

.chat-message.assistant {
    align-self: flex-start;
    background: var(--color-white);
    border-bottom-left-radius: 4px;
}

.chat-input-area {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background: var(--color-bg);
    padding: 20px 40px;
    border-top: 1px solid var(--color-border);
}

.chat-input-wrapper {
    max-width: 800px;
    margin: 0 auto;
    display: flex;
    gap: 12px;
}

.chat-input-wrapper textarea {
    flex: 1;
    padding: 14px 18px;
    border: 1px solid var(--color-border);
    border-radius: 12px;
    font-size: 14px;
    font-family: var(--font-sans);
    resize: none;
    rows: 1;
    max-height: 120px;
}

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

.chat-input-wrapper button {
    padding: 14px 24px;
    background: var(--color-bg-dark);
    color: var(--color-white);
    border: none;
    border-radius: 12px;
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
}

/* ── Sesión Expirada Modal ── */
.modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 10000;
    display: none;
}

.modal-overlay.active {
    display: flex;
}

.modal-content {
    background: var(--color-white);
    border-radius: 16px;
    padding: 48px;
    max-width: 480px;
    width: 90%;
    text-align: center;
}

.modal-content h2 {
    font-family: var(--font-serif);
    font-size: 1.5rem;
    margin-bottom: 12px;
}

.modal-content p {
    font-size: 14px;
    color: var(--color-text-light);
    margin-bottom: 28px;
}

/* ── Responsive ── */
@media (max-width: 1024px) {
    .levels-grid { grid-template-columns: 1fr; }
    .sub-grid { grid-template-columns: repeat(2, 1fr); }
    .dash-stats { grid-template-columns: 1fr; }
}

@media (max-width: 768px) {
    .nav { padding: 0 20px; }
    .nav-links { gap: 16px; }
    .hero { padding: 100px 20px 60px; }
    .section { padding: 60px 20px; }
    .promo-grid { grid-template-columns: 1fr; }
    .pricing-grid { grid-template-columns: 1fr; }
    .sub-grid { grid-template-columns: 1fr; }
    .leaders-section { padding: 60px 20px; }
    .leaders-pricing { padding: 32px; }
    .auth-card { padding: 32px 24px; }
    .chat-container { padding-left: 20px; padding-right: 20px; }
    .chat-input-area { padding: 16px 20px; }
}

@media (max-width: 480px) {
    .nav-links a:not(.btn-nav) { display: none; }
}