/* ==================================
   CSS VARIABLES & RESET
   ================================== */

:root {
    /* Colors - Basado en la portada */
    --color-bg-dark: #0a0a0a;
    --color-bg-medium: #1a1a1a;
    --color-bg-light: #2a2a2a;
    
    --color-primary: #d94a2e;      /* Naranja/rojo de la portada */
    --color-primary-dark: #b83820;
    --color-primary-light: #ff6b4a;
    
    --color-accent: #3dff8f;       /* Verde neón */
    --color-accent-dark: #2acc71;
    
    --color-text-primary: #e8e8e8;
    --color-text-secondary: #a0a0a0;
    --color-text-muted: #707070;
    
    --color-border: #333333;
    --color-border-light: #444444;
    
    /* Typography */
    --font-primary: 'Georgia', 'Times New Roman', serif;
    --font-secondary: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    
    --font-size-xs: 0.75rem;      /* 12px */
    --font-size-sm: 0.875rem;     /* 14px */
    --font-size-base: 1rem;       /* 16px */
    --font-size-lg: 1.125rem;     /* 18px */
    --font-size-xl: 1.25rem;      /* 20px */
    --font-size-2xl: 1.5rem;      /* 24px */
    --font-size-3xl: 2rem;        /* 32px */
    --font-size-4xl: 2.5rem;      /* 40px */
    --font-size-5xl: 3rem;        /* 48px */
    --font-size-6xl: 4rem;        /* 64px */
    
    --font-weight-normal: 400;
    --font-weight-medium: 500;
    --font-weight-semibold: 600;
    --font-weight-bold: 700;
    
    --line-height-tight: 1.2;
    --line-height-normal: 1.6;
    --line-height-relaxed: 1.8;
    
    /* Spacing */
    --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 */
    
    /* Layout */
    --container-max-width: 1200px;
    --container-padding: var(--spacing-md);
    
    /* Border radius */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    
    /* Shadows */
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 8px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 8px 16px rgba(0, 0, 0, 0.5);
    --shadow-glow: 0 0 20px rgba(217, 74, 46, 0.3);
    --shadow-glow-green: 0 0 20px rgba(61, 255, 143, 0.3);
    
    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-normal: 300ms ease;
    --transition-slow: 500ms ease;
    
    /* Z-index */
    --z-dropdown: 1000;
    --z-sticky: 1020;
    --z-fixed: 1030;
    --z-modal-backdrop: 1040;
    --z-modal: 1050;
    --z-popover: 1060;
    --z-tooltip: 1070;
}

/* ==================================
   RESET & BASE STYLES
   ================================== */

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

html {
    font-size: 16px;
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

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

/* ==================================
   TYPOGRAPHY
   ================================== */

h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-primary);
    font-weight: var(--font-weight-bold);
    line-height: var(--line-height-tight);
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-md);
}

h1 {
    font-size: var(--font-size-5xl);
}

h2 {
    font-size: var(--font-size-4xl);
}

h3 {
    font-size: var(--font-size-3xl);
}

h4 {
    font-size: var(--font-size-2xl);
}

h5 {
    font-size: var(--font-size-xl);
}

h6 {
    font-size: var(--font-size-lg);
}

p {
    margin-bottom: var(--spacing-sm);
}

a {
    color: var(--color-primary);
    text-decoration: none;
    transition: color var(--transition-fast);
}

a:hover {
    color: var(--color-primary-light);
}

strong, b {
    font-weight: var(--font-weight-bold);
}

em, i {
    font-style: italic;
}

/* ==================================
   LAYOUT
   ================================== */

.container {
    width: 100%;
    max-width: var(--container-max-width);
    margin: 0 auto;
    padding-left: var(--container-padding);
    padding-right: var(--container-padding);
}

.section__title {
    font-size: var(--font-size-4xl);
    text-align: center;
    margin-bottom: var(--spacing-xl);
    position: relative;
    padding-bottom: var(--spacing-md);
}

.section__title::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 80px;
    height: 3px;
    background: linear-gradient(90deg, var(--color-primary), var(--color-accent));
    border-radius: var(--radius-sm);
}

/* ==================================
   BUTTONS
   ================================== */

.btn {
    display: inline-block;
    padding: var(--spacing-sm) var(--spacing-lg);
    font-family: var(--font-secondary);
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-semibold);
    text-align: center;
    text-decoration: none;
    border: 2px solid transparent;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-normal);
    white-space: nowrap;
}

.btn--primary {
    background-color: var(--color-primary);
    color: #ffffff;
    border-color: var(--color-primary);
}

.btn--primary:hover {
    background-color: var(--color-primary-dark);
    border-color: var(--color-primary-dark);
    color: #ffffff;
    box-shadow: var(--shadow-glow);
    transform: translateY(-2px);
}

.btn--secondary {
    background-color: transparent;
    color: var(--color-text-primary);
    border-color: var(--color-text-primary);
}

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

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

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

.btn--large {
    padding: var(--spacing-md) var(--spacing-xl);
    font-size: var(--font-size-lg);
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    pointer-events: none;
}

/* ==================================
   NAVIGATION
   ================================== */

.nav {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background-color: rgba(10, 10, 10, 0.95);
    backdrop-filter: blur(10px);
    z-index: var(--z-fixed);
    border-bottom: 1px solid var(--color-border);
    transition: all var(--transition-normal);
}

.nav.scrolled {
    background-color: rgba(10, 10, 10, 0.98);
    box-shadow: var(--shadow-md);
}

.nav__container {
    max-width: var(--container-max-width);
    margin: 0 auto;
    padding: var(--spacing-sm) var(--container-padding);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav__logo {
    display: flex;
    flex-direction: column;
    color: var(--color-text-primary);
    text-decoration: none;
}

.nav__logo-text {
    font-family: var(--font-primary);
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-bold);
    color: var(--color-primary);
    line-height: 1;
}

.nav__logo-subtitle {
    font-size: var(--font-size-xs);
    color: var(--color-text-secondary);
    text-transform: uppercase;
    letter-spacing: 2px;
    margin-top: 2px;
}

.nav__menu {
    display: flex;
    list-style: none;
    gap: var(--spacing-lg);
    align-items: center;
}

.nav__item {
    margin: 0;
}

.nav__link {
    color: var(--color-text-secondary);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    text-transform: uppercase;
    letter-spacing: 1px;
    transition: color var(--transition-fast);
    padding: var(--spacing-xs) 0;
    position: relative;
}

.nav__link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--color-primary);
    transition: width var(--transition-fast);
}

.nav__link:hover {
    color: var(--color-text-primary);
}

.nav__link:hover::after {
    width: 100%;
}

.nav__link--cta {
    padding: var(--spacing-xs) var(--spacing-md);
    background-color: var(--color-primary);
    color: #ffffff;
    border-radius: var(--radius-sm);
}

.nav__link--cta::after {
    display: none;
}

.nav__link--cta:hover {
    background-color: var(--color-primary-dark);
    color: #ffffff;
}

.nav__toggle {
    display: none;
    background: transparent;
    border: none;
    cursor: pointer;
    padding: var(--spacing-xs);
}

.nav__toggle-icon {
    display: block;
    width: 24px;
    height: 2px;
    background-color: var(--color-text-primary);
    position: relative;
    transition: background-color var(--transition-fast);
}

.nav__toggle-icon::before,
.nav__toggle-icon::after {
    content: '';
    position: absolute;
    width: 24px;
    height: 2px;
    background-color: var(--color-text-primary);
    left: 0;
    transition: transform var(--transition-normal);
}

.nav__toggle-icon::before {
    top: -8px;
}

.nav__toggle-icon::after {
    top: 8px;
}

/* ==================================
   RESPONSIVE - MOBILE
   ================================== */

@media (max-width: 768px) {
    :root {
        --font-size-5xl: 2rem;
        --font-size-4xl: 1.75rem;
        --font-size-3xl: 1.5rem;
        --spacing-xl: 2rem;
        --spacing-2xl: 3rem;
        --spacing-3xl: 4rem;
    }
    
    .nav__menu {
        position: fixed;
        top: 60px;
        right: -100%;
        width: 80%;
        max-width: 300px;
        height: calc(100vh - 60px);
        background-color: rgba(26, 26, 26, 0.98);
        backdrop-filter: blur(10px);
        flex-direction: column;
        align-items: flex-start;
        padding: var(--spacing-lg);
        gap: var(--spacing-md);
        transition: right var(--transition-normal);
        border-left: 1px solid var(--color-border);
    }
    
    .nav__menu.active {
        right: 0;
    }
    
    .nav__toggle {
        display: block;
    }
    
    .nav__toggle.active .nav__toggle-icon {
        background-color: transparent;
    }
    
    .nav__toggle.active .nav__toggle-icon::before {
        transform: rotate(45deg);
        top: 0;
    }
    
    .nav__toggle.active .nav__toggle-icon::after {
        transform: rotate(-45deg);
        top: 0;
    }
    
    .section__title {
        font-size: var(--font-size-3xl);
    }
}

/* ==================================
   UTILITIES
   ================================== */

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

.text-primary {
    color: var(--color-primary);
}

.text-accent {
    color: var(--color-accent);
}

.mb-0 { margin-bottom: 0; }
.mb-sm { margin-bottom: var(--spacing-sm); }
.mb-md { margin-bottom: var(--spacing-md); }
.mb-lg { margin-bottom: var(--spacing-lg); }
.mb-xl { margin-bottom: var(--spacing-xl); }

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