/* VARIABLES Y TEMAS */
:root {
    --primary: #00d9ff;
    --secondary: #0099ff;
    --accent: #ff0080;
    --dark-bg: #0a0e27;
    --dark-bg-secondary: #151d3b;
    --dark-text: #ffffff;
    --light-bg: #f8f9fa;
    --light-bg-secondary: #ffffff;
    --light-text: #1a1a1a;
    --border-color: rgba(0, 217, 255, 0.1);
    --success: #00ff88;
    --warning: #ffaa00;
    --error: #ff4444;
    --shadow: 0 10px 40px rgba(0, 217, 255, 0.1);
    --shadow-lg: 0 20px 60px rgba(0, 0, 0, 0.3);
}

body.light-theme {
    --bg: var(--light-bg);
    --bg-secondary: var(--light-bg-secondary);
    --text: var(--light-text);
    --border-color: rgba(0, 0, 0, 0.1);
    --shadow: 0 10px 40px rgba(0, 0, 0, 0.08);
}

body.dark-theme {
    --bg: var(--dark-bg);
    --bg-secondary: var(--dark-bg-secondary);
    --text: var(--dark-text);
}

/* RESET Y BASE */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: var(--bg);
    color: var(--text);
    transition: background-color 0.3s ease, color 0.3s ease;
    overflow-x: hidden;
}

.dark-theme { background-color: var(--dark-bg); }
.light-theme { background-color: var(--light-bg); }

/* CONTAINER */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* TIPOGRAFÍA */
h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    letter-spacing: -0.5px;
}

h2 {
    font-size: 2.5rem;
    margin-bottom: 3rem;
    text-align: center;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

p {
    line-height: 1.6;
    opacity: 0.9;
}

a {
    color: var(--primary);
    text-decoration: none;
    transition: all 0.3s ease;
}

a:hover {
    color: var(--secondary);
}

/* BOTONES */
.btn-primary, .btn-secondary, .btn-download {
    padding: 12px 24px;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: var(--dark-bg);
    box-shadow: var(--shadow);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 15px 50px rgba(0, 217, 255, 0.3);
}

.btn-secondary {
    background: rgba(0, 217, 255, 0.1);
    color: var(--primary);
    border: 1px solid var(--primary);
}

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

.btn-download {
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: var(--dark-bg);
    padding: 14px 32px;
    font-size: 1.1rem;
    box-shadow: 0 10px 30px rgba(0, 217, 255, 0.2);
    border-radius: 8px;
}

.btn-download:hover {
    transform: scale(1.05);
    box-shadow: 0 15px 50px rgba(0, 217, 255, 0.4);
}

.btn-download:active {
    transform: scale(0.98);
}

.btn-loader {
    display: inline-block;
    width: 16px;
    height: 16px;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-top-color: white;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

.btn-loader.hidden { display: none; }

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

/* NAVBAR */
.navbar {
    background: var(--bg-secondary);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 20px;
}

.logo-wrapper {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary);
}

.logo-icon {
    width: 40px;
    height: 40px;
    filter: drop-shadow(0 0 8px rgba(0, 217, 255, 0.4));
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 2rem;
    align-items: center;
}

.nav-menu a {
    color: var(--text);
    font-weight: 500;
    position: relative;
}

.nav-menu a::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    transition: width 0.3s ease;
}

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

.theme-toggle {
    background: none;
    border: none;
    cursor: pointer;
    width: 24px;
    height: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text);
    transition: transform 0.3s ease;
}

.theme-toggle:hover {
    transform: rotate(20deg);
}

.sun-icon, .moon-icon {
    width: 20px;
    height: 20px;
    stroke: currentColor;
    fill: none;
    stroke-width: 2;
}

.dark-theme .sun-icon { display: none; }
.light-theme .moon-icon { display: none; }

@media (max-width: 768px) {
    .nav-menu {
        display: none;
    }
}

/* HERO SECTION */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 60px 20px;
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    inset: 0;
    background: radial-gradient(circle at 20% 50%, rgba(0, 217, 255, 0.1) 0%, transparent 50%),
                radial-gradient(circle at 80% 50%, rgba(0, 153, 255, 0.1) 0%, transparent 50%);
    animation: float 8s ease-in-out infinite;
    z-index: -1;
}

@keyframes float {
    0%, 100% { transform: translateY(0px); }
    50% { transform: translateY(20px); }
}

.hero-content {
    position: relative;
    z-index: 1;
    text-align: center;
    max-width: 900px;
    animation: slideUp 0.8s ease-out;
}

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

.hero-text {
    margin-bottom: 3rem;
}

.hero-title {
    font-size: clamp(2.5rem, 8vw, 4rem);
    margin-bottom: 1rem;
    line-height: 1.2;
    background: linear-gradient(135deg, var(--primary), var(--secondary), var(--primary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    background-size: 200% auto;
    animation: gradientFlow 3s linear infinite;
}

@keyframes gradientFlow {
    0% { background-position: 0% center; }
    100% { background-position: 200% center; }
}

.hero-subtitle {
    font-size: 1.2rem;
    color: var(--text);
    opacity: 0.8;
    margin-bottom: 2rem;
}

/* DOWNLOAD BOX */
.download-box {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 30px;
    margin-bottom: 3rem;
    backdrop-filter: blur(10px);
    box-shadow: 0 10px 40px rgba(0, 217, 255, 0.1);
}

.download-input-wrapper {
    display: flex;
    gap: 10px;
    margin-bottom: 20px;
}

.download-input {
    flex: 1;
    padding: 14px 18px;
    background: rgba(0, 217, 255, 0.05);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    color: var(--text);
    font-size: 1rem;
    transition: all 0.3s ease;
}

.download-input:focus {
    outline: none;
    border-color: var(--primary);
    background: rgba(0, 217, 255, 0.1);
    box-shadow: 0 0 20px rgba(0, 217, 255, 0.2);
}

.download-input::placeholder {
    color: var(--text);
    opacity: 0.5;
}

.status-message {
    padding: 12px 16px;
    border-radius: 8px;
    margin-top: 10px;
    font-weight: 500;
}

.status-message.hidden {
    display: none;
}

.status-message.success {
    background: rgba(0, 255, 136, 0.1);
    color: var(--success);
    border: 1px solid var(--success);
}

.status-message.error {
    background: rgba(255, 68, 68, 0.1);
    color: var(--error);
    border: 1px solid var(--error);
}

.status-message.info {
    background: rgba(0, 217, 255, 0.1);
    color: var(--primary);
    border: 1px solid var(--primary);
}

/* QUALITY SELECTOR */
.quality-selector {
    margin-top: 20px;
    padding: 20px;
    background: rgba(0, 217, 255, 0.05);
    border-radius: 8px;
}

.quality-selector.hidden {
    display: none;
}

.quality-title {
    margin-bottom: 15px;
    font-weight: 600;
    color: var(--primary);
}

.quality-options {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(100px, 1fr));
    gap: 10px;
}

.quality-option {
    padding: 10px 15px;
    background: rgba(0, 217, 255, 0.1);
    border: 1px solid var(--primary);
    border-radius: 6px;
    color: var(--primary);
    cursor: pointer;
    transition: all 0.3s ease;
    text-align: center;
    font-weight: 500;
}

.quality-option:hover {
    background: var(--primary);
    color: var(--dark-bg);
}

.quality-option.selected {
    background: var(--primary);
    color: var(--dark-bg);
}

/* HERO STATS */
.hero-stats {
    display: flex;
    justify-content: space-around;
    gap: 40px;
    flex-wrap: wrap;
    padding: 30px;
    background: rgba(0, 217, 255, 0.05);
    border-radius: 12px;
    border: 1px solid var(--border-color);
}

.stat {
    text-align: center;
}

.stat-number {
    display: block;
    font-size: 2rem;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: 5px;
}

.stat-label {
    display: block;
    font-size: 0.9rem;
    opacity: 0.7;
}

/* FEATURES SECTION */
.features {
    padding: 80px 20px;
    background: var(--bg);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
}

.feature-card {
    background: var(--bg-secondary);
    padding: 30px;
    border-radius: 12px;
    border: 1px solid var(--border-color);
    transition: all 0.3s ease;
    text-align: center;
}

.feature-card:hover {
    transform: translateY(-8px);
    border-color: var(--primary);
    box-shadow: 0 20px 60px rgba(0, 217, 255, 0.1);
}

.feature-icon {
    font-size: 3rem;
    margin-bottom: 15px;
}

.feature-card h3 {
    margin-bottom: 10px;
    color: var(--primary);
}

.feature-card p {
    opacity: 0.8;
}

/* GUIDE SECTION */
.guide {
    padding: 80px 20px;
    background: var(--bg-secondary);
}

.steps-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 20px;
    padding: 40px 20px;
}

.step {
    flex: 1;
    min-width: 150px;
    text-align: center;
    padding: 20px;
    background: var(--bg);
    border-radius: 12px;
    border: 1px solid var(--border-color);
    transition: all 0.3s ease;
}

.step:hover {
    border-color: var(--primary);
    transform: scale(1.05);
}

.step-number {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 50px;
    height: 50px;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: var(--dark-bg);
    border-radius: 50%;
    font-weight: 700;
    font-size: 1.5rem;
    margin-bottom: 15px;
}

.step h3 {
    margin-bottom: 10px;
    color: var(--primary);
}

.step-arrow {
    font-size: 2rem;
    color: var(--primary);
    opacity: 0.5;
}

@media (max-width: 768px) {
    .step-arrow { display: none; }
    .steps-container {
        flex-direction: column;
    }
}

/* FAQ SECTION */
.faq {
    padding: 80px 20px;
    background: var(--bg);
}

.faq-container {
    max-width: 800px;
    margin: 0 auto;
}

.faq-item {
    margin-bottom: 15px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    overflow: hidden;
}

.faq-question {
    width: 100%;
    padding: 20px;
    background: var(--bg-secondary);
    border: none;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 1rem;
    font-weight: 600;
    color: var(--text);
    transition: all 0.3s ease;
}

.faq-question:hover {
    background: rgba(0, 217, 255, 0.05);
    color: var(--primary);
}

.faq-icon {
    transition: transform 0.3s ease;
    color: var(--primary);
}

.faq-item.active .faq-icon {
    transform: rotate(45deg);
}

.faq-answer {
    padding: 20px;
    background: rgba(0, 217, 255, 0.02);
    border-top: 1px solid var(--border-color);
    animation: slideDown 0.3s ease-out;
}

.faq-answer.hidden {
    display: none;
}

@keyframes slideDown {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* EDUCATIONAL SECTION */
.educational {
    padding: 80px 20px;
    background: var(--bg-secondary);
}

.articles-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 30px;
}

.article-card {
    background: var(--bg);
    padding: 30px;
    border-radius: 12px;
    border: 1px solid var(--border-color);
    transition: all 0.3s ease;
}

.article-card:hover {
    transform: translateY(-8px);
    border-color: var(--primary);
    box-shadow: 0 20px 50px rgba(0, 217, 255, 0.1);
}

.article-card h3 {
    margin-bottom: 15px;
    color: var(--primary);
}

.read-more {
    display: inline-block;
    margin-top: 15px;
    color: var(--primary);
    font-weight: 600;
    transition: all 0.3s ease;
}

.read-more:hover {
    gap: 8px;
}

/* CONTACT SECTION */
.contact {
    padding: 80px 20px;
    background: var(--bg);
}

.contact-form {
    max-width: 600px;
    margin: 0 auto;
    background: var(--bg-secondary);
    padding: 40px;
    border-radius: 12px;
    border: 1px solid var(--border-color);
}

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

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 600;
    color: var(--primary);
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 12px 15px;
    background: rgba(0, 217, 255, 0.05);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    color: var(--text);
    font-size: 1rem;
    font-family: inherit;
    transition: all 0.3s ease;
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary);
    background: rgba(0, 217, 255, 0.1);
    box-shadow: 0 0 20px rgba(0, 217, 255, 0.2);
}

.contact-form .btn-primary {
    width: 100%;
    justify-content: center;
}

/* FOOTER */
.footer {
    background: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
    padding: 60px 20px 20px;
    color: var(--text);
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 40px;
    margin-bottom: 40px;
}

.footer-section h4 {
    color: var(--primary);
    margin-bottom: 15px;
}

.footer-section p {
    opacity: 0.8;
    font-size: 0.9rem;
}

.footer-section ul {
    list-style: none;
}

.footer-section ul li {
    margin-bottom: 10px;
}

.footer-section a {
    color: var(--text);
    opacity: 0.8;
    transition: all 0.3s ease;
}

.footer-section a:hover {
    color: var(--primary);
    opacity: 1;
}

.social-links {
    display: flex;
    gap: 15px;
}

.footer-bottom {
    text-align: center;
    padding-top: 20px;
    border-top: 1px solid var(--border-color);
    opacity: 0.6;
    font-size: 0.9rem;
}

/* COOKIE BANNER */
.cookie-banner {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
    padding: 20px;
    z-index: 999;
    animation: slideUp 0.5s ease-out;
}

.cookie-banner.hidden {
    display: none;
}

.cookie-content {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 20px;
}

.cookie-text h3 {
    color: var(--primary);
    margin-bottom: 8px;
    font-size: 1.1rem;
}

.cookie-text p {
    font-size: 0.9rem;
    opacity: 0.8;
}

.cookie-buttons {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
}

.cookie-buttons button {
    white-space: nowrap;
}

@media (max-width: 768px) {
    .cookie-content {
        flex-direction: column;
        align-items: flex-start;
    }

    .cookie-buttons {
        width: 100%;
    }

    .cookie-buttons button {
        flex: 1;
    }

    .hero-stats {
        flex-direction: column;
        gap: 20px;
    }

    h2 {
        font-size: 2rem;
    }

    .hero-title {
        font-size: 2rem;
    }

    .download-input-wrapper {
        flex-direction: column;
    }

    .contact-form {
        padding: 20px;
    }
}

/* UTILITARIOS */
.hidden {
    display: none !important;
}

/* ACCESIBILIDAD */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}