/* ===================================
   DESIGN SYSTEM - TOKENS
   =================================== */
:root {
    /* Colores Pastel Fríos - Especificación del Brief */
    --color-primary: #7DD3C0;              /* Verde agua */
    --color-primary-light: #9FE2D0;
    --color-primary-dark: #5BB5A2;
    --color-primary-darker: #429885;

    --color-secondary: #A8D8EA;            /* Azul cielo */
    --color-secondary-light: #C4E5F1;
    --color-secondary-dark: #88C4DD;

    --color-accent: #C5A8E9;               /* Lila claro */
    --color-accent-light: #D9C7F0;
    --color-accent-dark: #B090DC;

    --color-background: #FAFBFC;           /* Blanco suave */
    --color-white: #FFFFFF;
    --color-text: #2D3748;                 /* Gris oscuro cálido */
    --color-text-medium: #4A5568;
    --color-text-light: #718096;
    --color-text-lighter: #A0AEC0;
    --color-border: #E2E8F0;
    --color-border-light: #EDF2F7;

    /* Gradientes Sofisticados Multicapa */
    --gradient-primary: linear-gradient(135deg, #7DD3C0 0%, #6BC5B4 50%, #5BB5A2 100%);
    --gradient-primary-hover: linear-gradient(135deg, #9FE2D0 0%, #7DD3C0 50%, #6BC5B4 100%);
    --gradient-hero: linear-gradient(180deg, #FFFFFF 0%, #FAFBFC 60%, #F7FAFC 100%);
    --gradient-ai-bubble: linear-gradient(135deg, #A8D8EA 0%, #B8CEEB 25%, #C5A8E9 75%, #D0B4ED 100%);
    --gradient-icon: linear-gradient(135deg, #7DD3C0 0%, #92CDD9 50%, #A8D8EA 100%);
    --gradient-text: linear-gradient(135deg, #7DD3C0 0%, #A8D8EA 50%, #C5A8E9 100%);

    /* Tipografía - Escala Modular (1.250 - Major Third) */
    --font-primary: 'Lato', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-size-xs: 0.8rem;        /* 12.8px */
    --font-size-sm: 0.875rem;      /* 14px */
    --font-size-base: 1rem;        /* 16px */
    --font-size-md: 1.125rem;      /* 18px */
    --font-size-lg: 1.25rem;       /* 20px */
    --font-size-xl: 1.563rem;      /* 25px */
    --font-size-2xl: 1.953rem;     /* 31.25px */
    --font-size-3xl: 2.441rem;     /* 39px */
    --font-size-4xl: 3.052rem;     /* 48.83px */

    /* Font weights ajustados para Lato (disponibles: 300, 400, 700, 900) */
    --font-weight-light: 300;
    --font-weight-normal: 400;
    --font-weight-medium: 400;     /* Lato no tiene 500, usar regular */
    --font-weight-semibold: 700;   /* Lato no tiene 600, usar bold */
    --font-weight-bold: 700;
    --font-weight-extrabold: 900;

    /* Line-heights ajustados para Lato (x-height más alta que Inter) */
    --line-height-tight: 1.15;     /* Reducido de 1.2 para compensar x-height */
    --line-height-snug: 1.35;      /* Reducido de 1.4 */
    --line-height-normal: 1.55;    /* Reducido de 1.6 */
    --line-height-relaxed: 1.7;    /* Reducido de 1.75 */

    --letter-spacing-tight: -0.02em;
    --letter-spacing-normal: 0;
    --letter-spacing-wide: 0.02em;

    /* Espaciado - Sistema de 8px */
    --spacing-xs: 0.5rem;      /* 8px */
    --spacing-sm: 1rem;        /* 16px */
    --spacing-md: 1.5rem;      /* 24px */
    --spacing-lg: 2rem;        /* 32px */
    --spacing-xl: 3rem;        /* 48px */
    --spacing-2xl: 4rem;       /* 64px */
    --spacing-3xl: 6rem;       /* 96px */

    /* Bordes - Curvatura Suave */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 20px;
    --radius-2xl: 24px;
    --radius-full: 9999px;

    /* Sistema de Sombras Multicapa Profesional */
    --shadow-xs:
        0 1px 2px rgba(125, 211, 192, 0.04),
        0 1px 3px rgba(0, 0, 0, 0.02);

    --shadow-sm:
        0 2px 4px rgba(125, 211, 192, 0.06),
        0 1px 6px rgba(0, 0, 0, 0.04);

    --shadow-md:
        0 4px 8px rgba(125, 211, 192, 0.08),
        0 2px 12px rgba(0, 0, 0, 0.06),
        0 1px 4px rgba(0, 0, 0, 0.04);

    --shadow-lg:
        0 10px 20px rgba(125, 211, 192, 0.1),
        0 6px 24px rgba(0, 0, 0, 0.08),
        0 2px 8px rgba(0, 0, 0, 0.05);

    --shadow-xl:
        0 20px 40px rgba(125, 211, 192, 0.12),
        0 10px 30px rgba(0, 0, 0, 0.1),
        0 4px 12px rgba(0, 0, 0, 0.06);

    --shadow-primary:
        0 4px 16px rgba(125, 211, 192, 0.3),
        0 2px 8px rgba(125, 211, 192, 0.2);

    --shadow-primary-hover:
        0 8px 24px rgba(125, 211, 192, 0.35),
        0 4px 12px rgba(125, 211, 192, 0.25);

    /* Transiciones - Timing Functions Personalizados */
    --ease-smooth: cubic-bezier(0.4, 0.0, 0.2, 1);           /* Material Design */
    --ease-bounce: cubic-bezier(0.68, -0.55, 0.265, 1.55);   /* Bounce out */
    --ease-spring: cubic-bezier(0.175, 0.885, 0.32, 1.275);  /* Spring */
    --ease-elegant: cubic-bezier(0.645, 0.045, 0.355, 1);    /* Elegant */

    --duration-fast: 150ms;
    --duration-normal: 250ms;
    --duration-slow: 350ms;
    --duration-slower: 500ms;

    /* Z-Index Scale */
    --z-base: 1;
    --z-dropdown: 100;
    --z-sticky: 200;
    --z-overlay: 1000;
    --z-modal: 2000;
    --z-tooltip: 3000;
}

/* ===================================
   RESET Y BASE MEJORADO
   =================================== */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-primary);
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-normal);
    line-height: var(--line-height-normal);
    color: var(--color-text);
    background-color: var(--color-background);
    overflow-x: hidden;
}

/* Mejora de legibilidad en selección de texto */
::selection {
    background-color: var(--color-primary-light);
    color: var(--color-text);
}

/* Container con Grid System de 12 columnas */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

@media (min-width: 1400px) {
    .container {
        max-width: 1280px;
    }
}

/* ===================================
   NAVBAR - PROFESIONAL
   =================================== */
.navbar {
    background-color: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px) saturate(180%);
    -webkit-backdrop-filter: blur(10px) saturate(180%);
    padding: var(--spacing-md) 0;
    box-shadow: var(--shadow-sm);
    position: sticky;
    top: 0;
    z-index: var(--z-sticky);
    border-bottom: 1px solid var(--color-border-light);
    transition: all var(--duration-normal) var(--ease-smooth);
}

.navbar.scrolled {
    padding: var(--spacing-sm) 0;
    box-shadow: var(--shadow-md);
}

.nav-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-extrabold);
    letter-spacing: var(--letter-spacing-tight);
    background: var(--gradient-text);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    transition: transform var(--duration-normal) var(--ease-spring);
    cursor: pointer;
    text-decoration: none;
    display: inline-block;
}

.logo:hover {
    transform: scale(1.05);
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.nav-link {
    color: var(--color-text);
    text-decoration: none;
    font-weight: var(--font-weight-medium);
    font-size: var(--font-size-sm);
    position: relative;
    padding: var(--spacing-xs) 0;
    transition: color var(--duration-normal) var(--ease-smooth);
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--gradient-primary);
    transition: width var(--duration-normal) var(--ease-elegant);
}

.nav-link:hover {
    color: var(--color-primary);
}

.nav-link:hover::after {
    width: 100%;
}

.nav-link:focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: 4px;
    border-radius: var(--radius-sm);
}

.user-name {
    display: inline-flex;
    align-items: center;
    padding: var(--spacing-xs) var(--spacing-md);
    background: var(--gradient-primary);
    color: var(--color-white);
    border-radius: var(--radius-full);
    font-weight: var(--font-weight-semibold);
    font-size: var(--font-size-sm);
    margin-right: var(--spacing-sm);
    box-shadow: var(--shadow-sm);
}

#nav-guest,
#nav-user {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
}

/* ===================================
   BOTONES - ESTADOS COMPLETOS
   =================================== */
.btn {
    padding: 0.875rem 1.75rem;
    border-radius: var(--radius-md);
    font-weight: var(--font-weight-semibold);
    font-size: var(--font-size-sm);
    letter-spacing: var(--letter-spacing-wide);
    cursor: pointer;
    border: none;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-xs);
    position: relative;
    overflow: hidden;
    transition: all var(--duration-normal) var(--ease-smooth);
    user-select: none;
}

.btn::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    border-radius: var(--radius-full);
    background: rgba(255, 255, 255, 0.3);
    transform: translate(-50%, -50%);
    transition: width var(--duration-slow) var(--ease-smooth),
                height var(--duration-slow) var(--ease-smooth);
}

.btn:hover::before {
    width: 300px;
    height: 300px;
}

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

.btn-primary:hover {
    background: var(--gradient-primary-hover);
    transform: translateY(-2px);
    box-shadow: var(--shadow-primary-hover);
}

.btn-primary:active {
    transform: translateY(0);
    box-shadow: var(--shadow-sm);
}

.btn-primary:focus-visible {
    outline: 3px solid var(--color-primary-light);
    outline-offset: 3px;
}

.btn-primary:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none;
    box-shadow: none;
}

.btn-secondary {
    background-color: var(--color-white);
    color: var(--color-primary);
    border: 2px solid var(--color-primary);
    box-shadow: var(--shadow-xs);
}

.btn-secondary:hover {
    background-color: var(--color-primary);
    color: var(--color-white);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.btn-secondary:active {
    transform: translateY(0);
}

.btn-secondary:focus-visible {
    outline: 3px solid var(--color-primary-light);
    outline-offset: 2px;
}

.btn-outline {
    background-color: transparent;
    color: var(--color-text);
    border: 2px solid var(--color-border);
    transition: all var(--duration-normal) var(--ease-smooth);
}

.btn-outline:hover {
    border-color: var(--color-primary);
    color: var(--color-primary);
    background-color: rgba(125, 211, 192, 0.05);
}

.btn-outline:focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}

.btn-link {
    color: var(--color-text-light);
    background: none;
    padding: 0;
    text-decoration: underline;
    text-underline-offset: 3px;
    font-weight: var(--font-weight-medium);
}

.btn-link:hover {
    color: var(--color-primary);
    text-decoration-thickness: 2px;
}

.btn-large {
    padding: 1.25rem 2.5rem;
    font-size: var(--font-size-md);
    border-radius: var(--radius-lg);
}

.btn-full {
    width: 100%;
}

/* ===================================
   HERO SECTION - MEJORADO
   =================================== */
.hero {
    padding: var(--spacing-3xl) 0 var(--spacing-2xl);
    background: var(--gradient-hero);
    position: relative;
    overflow: hidden;
}

/* Decoración sutil de fondo */
.hero::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -20%;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(125, 211, 192, 0.08) 0%, transparent 70%);
    border-radius: var(--radius-full);
    pointer-events: none;
}

.hero-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-xl);
    align-items: center;
    position: relative;
    z-index: var(--z-base);
}

.hero-text {
    max-width: 600px;
}

.hero-title {
    font-size: var(--font-size-4xl);
    font-weight: var(--font-weight-extrabold);
    line-height: var(--line-height-tight);
    letter-spacing: var(--letter-spacing-tight);
    color: var(--color-text);
    margin-bottom: var(--spacing-md);
    background: linear-gradient(135deg, var(--color-text) 60%, var(--color-primary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-normal);
    color: var(--color-text-light);
    margin-bottom: var(--spacing-lg);
    line-height: var(--line-height-relaxed);
}

/* Chat Illustration - Glass Morphism */
.chat-illustration {
    display: flex;
    justify-content: center;
    align-items: center;
}

.illustration-container {
    width: 100%;
    max-width: 420px;
}

.device-mockup {
    background: rgba(255, 255, 255, 0.7);
    backdrop-filter: blur(20px) saturate(180%);
    -webkit-backdrop-filter: blur(20px) saturate(180%);
    border: 1px solid rgba(255, 255, 255, 0.5);
    border-radius: var(--radius-2xl);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-xl);
    min-height: 380px;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
    justify-content: center;
}

.chat-bubble {
    padding: var(--spacing-md);
    border-radius: var(--radius-lg);
    max-width: 85%;
    animation: fadeInUp var(--duration-slow) var(--ease-spring);
    box-shadow: var(--shadow-sm);
}

.chat-bubble-ai {
    background: var(--gradient-ai-bubble);
    color: var(--color-white);
    align-self: flex-start;
    border-bottom-left-radius: var(--radius-sm);
}

.chat-bubble-user {
    background-color: var(--color-white);
    color: var(--color-text);
    align-self: flex-end;
    border-bottom-right-radius: var(--radius-sm);
    border: 1px solid var(--color-border-light);
}

/* Burbujas del hero (ejemplo visual) - Más grandes para impacto */
.device-mockup .chat-bubble p {
    margin: 0;
    font-size: var(--font-size-base);
    line-height: var(--line-height-normal);
    font-weight: var(--font-weight-medium);
}

/* Burbujas del chat funcional - Más compactas */
.chat-interface .chat-bubble p,
.message-content p {
    margin: 0;
    font-size: var(--font-size-sm);
    line-height: var(--line-height-snug);
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(15px) scale(0.95);
    }
    to {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

/* ===================================
   WHY SECTION
   =================================== */
.why-section {
    padding: var(--spacing-2xl) 0;
    background-color: var(--color-white);
}

.why-content {
    text-align: center;
    max-width: 720px;
    margin: 0 auto;
}

.why-text {
    font-size: var(--font-size-md);
    font-weight: var(--font-weight-normal);
    color: var(--color-text-light);
    margin-bottom: var(--spacing-lg);
    line-height: var(--line-height-relaxed);
}

/* ===================================
   HOW IT WORKS SECTION
   =================================== */
.how-it-works {
    padding: var(--spacing-3xl) 0;
}

.section-title {
    font-size: var(--font-size-3xl);
    font-weight: var(--font-weight-bold);
    letter-spacing: var(--letter-spacing-tight);
    text-align: center;
    color: var(--color-text);
    margin-bottom: var(--spacing-2xl);
}

.steps {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-2xl);
}

.step {
    text-align: center;
    padding: var(--spacing-xl);
    background-color: var(--color-white);
    border-radius: var(--radius-xl);
    border: 1px solid var(--color-border-light);
    transition: all var(--duration-normal) var(--ease-smooth);
    position: relative;
}

.step::before {
    content: '';
    position: absolute;
    inset: 0;
    border-radius: var(--radius-xl);
    padding: 2px;
    background: var(--gradient-primary);
    -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
    -webkit-mask-composite: xor;
    mask-composite: exclude;
    opacity: 0;
    transition: opacity var(--duration-normal) var(--ease-smooth);
}

.step:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
}

.step:hover::before {
    opacity: 1;
}

.step-icon {
    width: 88px;
    height: 88px;
    margin: 0 auto var(--spacing-md);
    background: var(--gradient-icon);
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-md);
    transition: transform var(--duration-normal) var(--ease-bounce);
}

.step:hover .step-icon {
    transform: scale(1.1) rotate(5deg);
}

.step-icon svg {
    width: 44px;
    height: 44px;
    color: var(--color-white);
    filter: drop-shadow(0 2px 4px rgba(0, 0, 0, 0.1));
}

.step-title {
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-bold);
    color: var(--color-text);
    margin-bottom: var(--spacing-sm);
}

.step-description {
    color: var(--color-text-light);
    font-size: var(--font-size-base);
    line-height: var(--line-height-relaxed);
}

.cta-center {
    text-align: center;
    margin-top: var(--spacing-2xl);
}

/* ===================================
   CHAT INTERFACE
   =================================== */
.chat-interface {
    position: fixed;
    inset: 0;
    background-color: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: var(--z-overlay);
    padding: var(--spacing-md);
    animation: fadeIn var(--duration-normal) var(--ease-smooth);
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

.chat-container {
    background-color: var(--color-white);
    border-radius: var(--radius-2xl);
    max-width: 720px;
    width: 100%;
    height: 80vh;
    max-height: 720px;
    display: flex;
    flex-direction: column;
    box-shadow: var(--shadow-xl);
    overflow: hidden;
    animation: slideInUp var(--duration-slow) var(--ease-spring);
}

@keyframes slideInUp {
    from {
        opacity: 0;
        transform: translateY(30px) scale(0.95);
    }
    to {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

.chat-header {
    padding: var(--spacing-md) var(--spacing-lg);
    border-bottom: 1px solid rgba(255, 255, 255, 0.2);
    background: var(--gradient-primary);
    color: var(--color-white);
    position: relative;
}

.chat-header h3 {
    margin: 0 0 var(--spacing-xs) 0;
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-semibold);
}

.chat-progress {
    font-size: var(--font-size-sm);
    opacity: 0.95;
}

.progress-bar {
    background-color: rgba(255, 255, 255, 0.25);
    height: 4px;
    border-radius: var(--radius-full);
    margin-top: var(--spacing-xs);
    overflow: hidden;
}

.progress-fill {
    background-color: var(--color-white);
    height: 100%;
    width: 0%;
    transition: width var(--duration-slow) var(--ease-smooth);
    border-radius: var(--radius-full);
    box-shadow: 0 0 12px rgba(255, 255, 255, 0.6);
}

.close-btn {
    position: absolute;
    top: var(--spacing-md);
    right: var(--spacing-md);
    background: rgba(255, 255, 255, 0.15);
    backdrop-filter: blur(10px);
    border: none;
    color: var(--color-white);
    font-size: 1.5rem;
    cursor: pointer;
    line-height: 1;
    padding: 0;
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-full);
    transition: all var(--duration-fast) var(--ease-smooth);
}

.close-btn:hover {
    background-color: rgba(255, 255, 255, 0.3);
    transform: rotate(90deg) scale(1.1);
}

.chat-messages {
    flex: 1;
    overflow-y: auto;
    padding: var(--spacing-lg);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
    scroll-behavior: smooth;
}

/* Custom scrollbar */
.chat-messages::-webkit-scrollbar {
    width: 8px;
}

.chat-messages::-webkit-scrollbar-track {
    background: var(--color-background);
}

.chat-messages::-webkit-scrollbar-thumb {
    background: var(--color-border);
    border-radius: var(--radius-full);
}

.chat-messages::-webkit-scrollbar-thumb:hover {
    background: var(--color-text-lighter);
}

.message {
    display: flex;
    gap: var(--spacing-sm);
    animation: messageSlide var(--duration-normal) var(--ease-spring);
}

@keyframes messageSlide {
    from {
        opacity: 0;
        transform: translateY(10px) scale(0.95);
    }
    to {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

.message.ai {
    flex-direction: row;
}

.message.user {
    flex-direction: row-reverse;
}

.message-content {
    padding: var(--spacing-md);
    border-radius: var(--radius-lg);
    max-width: 75%;
    box-shadow: var(--shadow-sm);
}

.message.ai .message-content {
    background: var(--gradient-ai-bubble);
    color: var(--color-white);
    border-bottom-left-radius: var(--radius-sm);
}

.message.user .message-content {
    background-color: var(--color-background);
    color: var(--color-text);
    border-bottom-right-radius: var(--radius-sm);
    border: 1px solid var(--color-border-light);
}

.chat-input-area {
    padding: var(--spacing-md) var(--spacing-lg);
    border-top: 1px solid var(--color-border);
    background-color: var(--color-white);
}

.choice-chips {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
}

.choice-chip {
    padding: 0.625rem var(--spacing-md);
    background-color: var(--color-white);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-full);
    cursor: pointer;
    transition: all var(--duration-normal) var(--ease-spring);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
}

.choice-chip:hover {
    border-color: var(--color-primary);
    background: var(--gradient-primary);
    color: var(--color-white);
    transform: translateY(-3px);
    box-shadow: var(--shadow-primary);
}

.choice-chip:active {
    transform: translateY(-1px);
}

/* ===================================
   MODAL
   =================================== */
.modal {
    position: fixed;
    inset: 0;
    z-index: var(--z-modal);
    display: flex;
    justify-content: center;
    align-items: center;
    padding: var(--spacing-md);
    animation: fadeIn var(--duration-normal) var(--ease-smooth);
}

.modal-overlay {
    position: absolute;
    inset: 0;
    background-color: rgba(45, 55, 72, 0.75);
    backdrop-filter: blur(12px) saturate(120%);
    -webkit-backdrop-filter: blur(12px) saturate(120%);
}

.modal-content {
    position: relative;
    background-color: var(--color-white);
    border-radius: var(--radius-2xl);
    padding: var(--spacing-2xl);
    max-width: 520px;
    width: 100%;
    box-shadow: var(--shadow-xl);
    border: 1px solid var(--color-border-light);
    animation: modalSlideIn var(--duration-slow) var(--ease-spring);
}

.modal-content-large {
    max-width: 900px;
    max-height: 85vh;
    overflow-y: auto;
}

.terapia-detalle {
    text-align: left;
    margin-top: var(--spacing-lg);
    padding: var(--spacing-xl);
    background-color: var(--color-white);
    border-radius: var(--radius-lg);
    font-size: var(--font-size-base);
    line-height: var(--line-height-relaxed);
    color: var(--color-text);
    border: 1px solid var(--color-border-light);
    max-height: 60vh;
    overflow-y: auto;
}

.terapia-detalle h1,
.terapia-detalle h2,
.terapia-detalle h3,
.terapia-detalle h4,
.terapia-detalle h5,
.terapia-detalle h6 {
    color: var(--color-text);
    font-weight: var(--font-weight-bold);
    line-height: var(--line-height-tight);
}

.terapia-detalle p {
    margin-bottom: 1rem;
    color: var(--color-text);
}

.terapia-detalle ul,
.terapia-detalle ol {
    margin-left: 1.5rem;
    margin-bottom: 1rem;
}

.terapia-detalle li {
    margin-bottom: 0.5rem;
    color: var(--color-text);
}

.terapia-detalle strong {
    font-weight: var(--font-weight-bold);
    color: var(--color-text);
}

.terapia-detalle em {
    font-style: italic;
}

.terapia-detalle::-webkit-scrollbar {
    width: 8px;
}

.terapia-detalle::-webkit-scrollbar-track {
    background: var(--color-border-light);
    border-radius: var(--radius-full);
}

.terapia-detalle::-webkit-scrollbar-thumb {
    background: var(--color-primary);
    border-radius: var(--radius-full);
}

.terapia-detalle::-webkit-scrollbar-thumb:hover {
    background: var(--color-primary-dark);
}

@keyframes modalSlideIn {
    from {
        opacity: 0;
        transform: scale(0.9) translateY(20px);
    }
    to {
        opacity: 1;
        transform: scale(1) translateY(0);
    }
}

.modal-close {
    position: absolute;
    top: var(--spacing-md);
    right: var(--spacing-md);
    background: var(--color-background);
    border: none;
    font-size: 1.5rem;
    color: var(--color-text-light);
    cursor: pointer;
    line-height: 1;
    padding: 0;
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-full);
    transition: all var(--duration-fast) var(--ease-smooth);
}

.modal-close:hover {
    background-color: var(--color-primary-light);
    color: var(--color-white);
    transform: rotate(90deg);
}

.modal-icon {
    font-size: 3.5rem;
    text-align: center;
    margin-bottom: var(--spacing-md);
    animation: iconBounce var(--duration-slower) var(--ease-bounce);
}

@keyframes iconBounce {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.1); }
}

.modal-title {
    font-size: var(--font-size-2xl);
    font-weight: var(--font-weight-bold);
    letter-spacing: var(--letter-spacing-tight);
    color: var(--color-text);
    text-align: center;
    margin-bottom: var(--spacing-md);
}

.modal-text {
    color: var(--color-text-light);
    text-align: center;
    margin-bottom: var(--spacing-sm);
    line-height: var(--line-height-relaxed);
    font-size: var(--font-size-base);
}

.modal-text-italic {
    font-style: italic;
    color: var(--color-text-medium);
    text-align: center;
    margin-bottom: var(--spacing-lg);
    font-size: var(--font-size-sm);
}

.modal-actions {
    margin: var(--spacing-lg) 0;
}

.modal-question {
    text-align: center;
    color: var(--color-text-light);
    margin: var(--spacing-md) 0 var(--spacing-sm) 0;
    font-size: var(--font-size-sm);
}

.modal-notes {
    margin-top: var(--spacing-lg);
    padding-top: var(--spacing-lg);
    border-top: 1px solid var(--color-border);
}

.modal-notes p {
    color: var(--color-text-light);
    font-size: var(--font-size-xs);
    margin: var(--spacing-xs) 0;
    text-align: center;
}

/* ===================================
   RESULTS SCREEN
   =================================== */
.results-screen {
    padding: var(--spacing-3xl) 0;
    background: var(--gradient-hero);
    min-height: 100vh;
}

.results-content {
    max-width: 920px;
    margin: 0 auto;
}

.result-intro {
    text-align: center;
    margin-bottom: var(--spacing-2xl);
}

.result-intro p {
    font-size: var(--font-size-md);
    color: var(--color-text-light);
    line-height: var(--line-height-relaxed);
}

.therapy-cards {
    display: grid;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-2xl);
}

.therapy-card {
    background-color: var(--color-white);
    padding: var(--spacing-2xl);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-lg);
    border-left: 5px solid transparent;
    border-image: var(--gradient-primary) 1;
    transition: all var(--duration-normal) var(--ease-smooth);
    position: relative;
    overflow: hidden;
}

.therapy-card::before {
    content: '';
    position: absolute;
    top: 0;
    right: 0;
    width: 150px;
    height: 150px;
    background: radial-gradient(circle, rgba(125, 211, 192, 0.1) 0%, transparent 70%);
    border-radius: var(--radius-full);
    transform: translate(40%, -40%);
}

.therapy-card:hover {
    transform: translateY(-8px) scale(1.02);
    box-shadow: var(--shadow-xl);
}

.therapy-name {
    font-size: var(--font-size-2xl);
    font-weight: var(--font-weight-bold);
    background: var(--gradient-text);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: var(--spacing-md);
}

.therapy-description {
    font-size: var(--font-size-md);
    color: var(--color-text-light);
    line-height: var(--line-height-relaxed);
}

.results-actions {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
    align-items: center;
    margin-bottom: var(--spacing-2xl);
}

.share-section {
    background-color: var(--color-white);
    padding: var(--spacing-2xl);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-md);
    border: 1px solid var(--color-border-light);
}

.share-title {
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-semibold);
    text-align: center;
    color: var(--color-text);
    margin-bottom: var(--spacing-lg);
}

.share-buttons {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--spacing-md);
}

.share-btn {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md);
    background-color: var(--color-white);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-lg);
    cursor: pointer;
    transition: all var(--duration-normal) var(--ease-spring);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-semibold);
}

.share-btn svg {
    width: 36px;
    height: 36px;
    transition: transform var(--duration-normal) var(--ease-bounce);
}

.share-btn:hover svg {
    transform: scale(1.15) rotate(-5deg);
}

.share-btn.whatsapp { color: #25D366; border-color: #25D366; }
.share-btn.whatsapp:hover { background-color: #25D366; color: white; box-shadow: 0 4px 16px rgba(37, 211, 102, 0.3); }

.share-btn.instagram { color: #E4405F; border-color: #E4405F; }
.share-btn.instagram:hover { background-color: #E4405F; color: white; box-shadow: 0 4px 16px rgba(228, 64, 95, 0.3); }

.share-btn.facebook { color: #1877F2; border-color: #1877F2; }
.share-btn.facebook:hover { background-color: #1877F2; color: white; box-shadow: 0 4px 16px rgba(24, 119, 242, 0.3); }

.share-btn.tiktok { color: #000000; border-color: #000000; }
.share-btn.tiktok:hover { background-color: #000000; color: white; box-shadow: 0 4px 16px rgba(0, 0, 0, 0.2); }

/* ===================================
   FOOTER
   =================================== */
.footer {
    background-color: var(--color-white);
    padding: var(--spacing-2xl) 0;
    border-top: 1px solid var(--color-border);
    margin-top: var(--spacing-3xl);
}

.footer-content {
    text-align: center;
}

.footer-logo {
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-extrabold);
    letter-spacing: var(--letter-spacing-tight);
    margin-bottom: var(--spacing-md);
    background: var(--gradient-text);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.footer-links {
    display: flex;
    justify-content: center;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-md);
    flex-wrap: wrap;
}

.footer-links a {
    color: var(--color-text-light);
    text-decoration: none;
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    transition: all var(--duration-fast) var(--ease-smooth);
    position: relative;
}

.footer-links a::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--gradient-primary);
    transition: width var(--duration-normal) var(--ease-elegant);
}

.footer-links a:hover {
    color: var(--color-primary);
}

.footer-links a:hover::after {
    width: 100%;
}

.footer-social {
    display: flex;
    justify-content: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

.footer-social a {
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-full);
    background-color: var(--color-background);
    color: var(--color-text-light);
    transition: all var(--duration-normal) var(--ease-spring);
}

.footer-social a:hover {
    background: var(--gradient-primary);
    color: var(--color-white);
    transform: translateY(-4px) rotate(5deg);
    box-shadow: var(--shadow-primary);
}

.footer-social svg {
    width: 22px;
    height: 22px;
}

.footer-disclaimer {
    color: var(--color-text-light);
    font-size: var(--font-size-xs);
    max-width: 640px;
    margin: 0 auto;
    line-height: var(--line-height-relaxed);
}

/* ===================================
   RESPONSIVE DESIGN
   =================================== */
@media (max-width: 968px) {
    .hero-content {
        grid-template-columns: 1fr;
        text-align: center;
        gap: var(--spacing-2xl);
    }

    .hero-text {
        max-width: 100%;
    }

    .hero-title {
        font-size: var(--font-size-3xl);
    }

    .steps {
        grid-template-columns: 1fr;
        gap: var(--spacing-lg);
    }

    .share-buttons {
        grid-template-columns: repeat(2, 1fr);
    }

    .nav-menu {
        flex-wrap: wrap;
        gap: var(--spacing-sm);
    }
}

@media (max-width: 640px) {
    .hero {
        padding: var(--spacing-2xl) 0;
    }

    .hero-title {
        font-size: var(--font-size-2xl);
    }

    .hero-subtitle {
        font-size: var(--font-size-base);
    }

    .section-title {
        font-size: var(--font-size-2xl);
    }

    .footer-links {
        flex-direction: column;
        gap: var(--spacing-sm);
    }

    .chat-container {
        height: 100vh;
        max-height: none;
        border-radius: 0;
    }

    .share-buttons {
        grid-template-columns: 1fr;
    }

    .modal-content {
        padding: var(--spacing-lg);
    }

    .btn-large {
        padding: 1rem 2rem;
        font-size: var(--font-size-base);
    }
}

/* ===================================
   UTILITIES
   =================================== */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

/* Spacing utilities */
.mb-0 { margin-bottom: 0; }
.mb-1 { margin-bottom: var(--spacing-sm); }
.mb-2 { margin-bottom: var(--spacing-md); }
.mb-3 { margin-bottom: var(--spacing-lg); }
.mb-4 { margin-bottom: var(--spacing-xl); }

.mt-0 { margin-top: 0; }
.mt-1 { margin-top: var(--spacing-sm); }
.mt-2 { margin-top: var(--spacing-md); }
.mt-3 { margin-top: var(--spacing-lg); }
.mt-4 { margin-top: var(--spacing-xl); }

/* Accessibility */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border-width: 0;
}

/* Focus visible enhancement */
*:focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: 3px;
    border-radius: var(--radius-sm);
}

/* Loading state */
@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

.loading {
    animation: pulse 2s cubic-bezier(0.4, 0, 0.6, 1) infinite;
}

/* Print styles */
@media print {
    .navbar, .footer, .chat-interface, .modal {
        display: none;
    }
}

/* ===================================
   ESTILOS PARA RESULTADOS DINÁMICOS
   =================================== */

/* Badge de compatibilidad */
.compatibilidad-badge {
    display: inline-block;
    margin-top: var(--spacing-md);
    padding: var(--spacing-xs) var(--spacing-md);
    background: var(--gradient-primary);
    color: var(--color-white);
    border-radius: var(--radius-full);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-semibold);
    box-shadow: var(--shadow-sm);
    animation: badgePulse 2s ease-in-out infinite;
}

@keyframes badgePulse {
    0%, 100% {
        box-shadow: var(--shadow-sm);
        transform: scale(1);
    }
    50% {
        box-shadow: var(--shadow-primary);
        transform: scale(1.05);
    }
}

/* Metadata de resultados */
.result-metadata {
    text-align: center;
    color: var(--color-text-lighter);
    font-size: var(--font-size-xs);
    font-style: italic;
    margin-top: var(--spacing-xl);
    padding-top: var(--spacing-lg);
    border-top: 1px solid var(--color-border);
}

/* Estado de carga mejorado */
.message-content.loading {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.message-content.loading::after {
    content: '';
    width: 20px;
    height: 20px;
    border: 2px solid var(--color-white);
    border-top-color: transparent;
    border-radius: var(--radius-full);
    animation: spin 1s linear infinite;
}

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

/* ===================================
   FORMULARIOS DE AUTENTICACIÓN
   =================================== */

.auth-view {
    animation: authSlideIn var(--duration-slow) var(--ease-spring);
}

@keyframes authSlideIn {
    from {
        opacity: 0;
        transform: translateX(20px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

.form-group {
    margin-bottom: var(--spacing-md);
    text-align: left;
}

.form-group label {
    display: block;
    margin-bottom: var(--spacing-xs);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-semibold);
    color: var(--color-text);
}

.form-input {
    width: 100%;
    padding: 0.875rem var(--spacing-md);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-md);
    font-size: var(--font-size-base);
    font-family: var(--font-primary);
    color: var(--color-text);
    background-color: var(--color-white);
    transition: all var(--duration-normal) var(--ease-smooth);
}

.form-input:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(125, 211, 192, 0.1);
}

.form-input:hover {
    border-color: var(--color-primary-light);
}

.form-input::placeholder {
    color: var(--color-text-lighter);
}

.error-message {
    background-color: #FEE2E2;
    border: 1px solid #FCA5A5;
    border-radius: var(--radius-md);
    padding: var(--spacing-sm) var(--spacing-md);
    margin-bottom: var(--spacing-md);
    color: #DC2626;
    font-size: var(--font-size-sm);
    text-align: center;
    animation: errorShake 0.4s ease-in-out;
}

@keyframes errorShake {
    0%, 100% { transform: translateX(0); }
    25% { transform: translateX(-10px); }
    75% { transform: translateX(10px); }
}

.modal-question a {
    color: var(--color-primary);
    text-decoration: none;
    font-weight: var(--font-weight-semibold);
    transition: color var(--duration-fast) var(--ease-smooth);
}

.modal-question a:hover {
    color: var(--color-primary-dark);
    text-decoration: underline;
}

/* Estados de botones de formulario */
.btn:disabled,
.btn[disabled] {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none !important;
}

.btn.loading {
    position: relative;
    color: transparent;
}

.btn.loading::after {
    content: '';
    position: absolute;
    width: 20px;
    height: 20px;
    top: 50%;
    left: 50%;
    margin-left: -10px;
    margin-top: -10px;
    border: 2px solid var(--color-white);
    border-top-color: transparent;
    border-radius: var(--radius-full);
    animation: spin 0.8s linear infinite;
}

/* ===================================
   SECCIONES DE INFORMACIÓN
   =================================== */
.info-section {
    padding: var(--spacing-3xl) 0;
    background: var(--gradient-hero);
    min-height: 100vh;
    animation: fadeIn var(--duration-slow) var(--ease-smooth);
}

.info-content {
    max-width: 820px;
    margin: 0 auto;
    background-color: var(--color-white);
    padding: var(--spacing-2xl);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--color-border-light);
}

.info-content h3 {
    font-size: var(--font-size-2xl);
    font-weight: var(--font-weight-bold);
    color: var(--color-text);
    margin-bottom: var(--spacing-lg);
    margin-top: var(--spacing-xl);
}

.info-content h3:first-child {
    margin-top: 0;
}

.info-content h4 {
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-semibold);
    color: var(--color-primary-dark);
    margin-bottom: var(--spacing-sm);
    margin-top: var(--spacing-lg);
}

.info-content p {
    font-size: var(--font-size-base);
    color: var(--color-text-light);
    line-height: var(--line-height-relaxed);
    margin-bottom: var(--spacing-md);
}

.info-content ul {
    list-style: none;
    padding: 0;
    margin-bottom: var(--spacing-lg);
}

.info-content ul li {
    position: relative;
    padding-left: var(--spacing-lg);
    margin-bottom: var(--spacing-sm);
    color: var(--color-text);
    font-size: var(--font-size-base);
    line-height: var(--line-height-relaxed);
}

.info-content ul li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--color-primary);
    font-weight: var(--font-weight-bold);
    font-size: var(--font-size-lg);
}

.info-content .btn {
    margin-top: var(--spacing-xl);
}

.contact-info h4 {
    font-size: var(--font-size-md);
    font-weight: var(--font-weight-semibold);
    color: var(--color-primary);
    margin-bottom: var(--spacing-xs);
    margin-top: var(--spacing-lg);
}

.contact-info p {
    margin-bottom: var(--spacing-md);
}

.contact-info p strong {
    color: var(--color-text);
    font-weight: var(--font-weight-semibold);
}

@media (max-width: 640px) {
    .info-section {
        padding: var(--spacing-xl) 0;
    }

    .info-content {
        padding: var(--spacing-lg);
    }

    .info-content h3 {
        font-size: var(--font-size-xl);
    }

    .info-content h4 {
        font-size: var(--font-size-md);
    }
}