/* ============================================
   QUIMIX LAB — Design System
   Modo Claro — Inspirado en Bixol Cleaning
   ============================================ */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800;900&family=Space+Grotesk:wght@400;500;600;700&display=swap');

/* ── Variables ── */
:root {
    --primary: #0055FF;
    --primary-dark: #003ECB;
    --primary-light: #3377FF;
    --primary-glow: rgba(0, 85, 255, 0.2);
    --secondary: #001A57;
    --accent: #00D4AA;
    --accent-light: #33E0BF;

    --bg-body: #FFFFFF;
    --bg-section: #F5F8FC;
    --bg-card: #FFFFFF;
    --bg-card-hover: #F0F5FF;
    --bg-input: #F5F8FC;
    --bg-glass: rgba(255, 255, 255, 0.85);

    --text: #333333;
    --text-muted: #6B7B8D;
    --text-heading: #001A57;
    --text-dark: #001A57;
    --text-on-primary: #FFFFFF;

    --border: #E2E8F0;
    --border-active: rgba(0, 85, 255, 0.4);

    --success: #00C853;
    --danger: #E53935;
    --warning: #FF9800;
    --info: #2196F3;

    --radius-sm: 8px;
    --radius: 12px;
    --radius-lg: 20px;
    --radius-xl: 28px;
    --radius-full: 9999px;

    --shadow-sm: 0 2px 8px rgba(0, 26, 87, 0.06);
    --shadow: 0 4px 20px rgba(0, 26, 87, 0.08);
    --shadow-lg: 0 8px 40px rgba(0, 26, 87, 0.12);
    --shadow-glow: 0 0 30px var(--primary-glow);

    --font-body: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-heading: 'Space Grotesk', 'Inter', sans-serif;

    --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 0.5s cubic-bezier(0.4, 0, 0.2, 1);

    --container: 1200px;
    --header-h: 80px;
}

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

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

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

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

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

ul, ol { list-style: none; }

h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    color: var(--text-heading);
    line-height: 1.2;
    font-weight: 700;
}

/* ── Container ── */
.container {
    width: 100%;
    max-width: var(--container);
    margin: 0 auto;
    padding: 0 20px;
}

/* ── Header / Nav ── */
.header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: var(--header-h);
    z-index: 1000;
    transition: var(--transition);
    background: transparent;
}

.header.scrolled {
    background: rgba(255, 255, 255, 0.97);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border);
    box-shadow: var(--shadow);
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 100%;
    max-width: var(--container);
    margin: 0 auto;
    padding: 0 20px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-family: var(--font-heading);
    font-size: 1.6rem;
    font-weight: 800;
    color: var(--text-heading);
}

.header.scrolled .logo { color: var(--text-heading); }

.logo-icon {
    width: 40px;
    height: 40px;
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    color: #fff;
}

.logo span { color: var(--primary); }

.nav-menu {
    display: flex;
    align-items: center;
    gap: 32px;
}

.nav-menu a {
    color: var(--text);
    font-size: 0.95rem;
    font-weight: 500;
    position: relative;
    padding: 4px 0;
}

.header:not(.scrolled) .nav-menu a { color: #fff; }
.header:not(.scrolled) .logo { color: #fff; }
.header:not(.scrolled) .menu-toggle span { background: #fff; }

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

.nav-menu a:hover { color: var(--primary); }
.nav-menu a:hover::after { width: 100%; }

.nav-cta {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 9px 22px;
    background: var(--primary);
    color: #fff !important;
    border-radius: var(--radius-full);
    font-weight: 600;
    font-size: 0.85rem;
    transition: var(--transition);
    line-height: 1;
    white-space: nowrap;
    vertical-align: middle;
    margin-left: 8px;
}

.nav-cta:hover {
    background: var(--primary-dark);
    color: #fff !important;
    transform: translateY(-2px);
    box-shadow: var(--shadow-glow);
}

.nav-cta::after { display: none !important; }

.header:not(.scrolled) .nav-cta {
    background: rgba(255,255,255,0.15);
    border: 1px solid rgba(255,255,255,0.3);
}
.header:not(.scrolled) .nav-cta:hover {
    background: #fff;
    color: var(--primary) !important;
}

/* Mobile menu toggle */
.menu-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 5px;
}

.menu-toggle span {
    width: 28px;
    height: 2px;
    background: var(--text);
    transition: var(--transition);
    border-radius: 2px;
}

/* ── Buttons ── */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 14px 32px;
    border-radius: var(--radius-full);
    font-family: var(--font-body);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    border: none;
    transition: var(--transition);
    text-decoration: none;
}

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

.btn-primary:hover {
    background: var(--primary-dark);
    color: #fff;
    transform: translateY(-3px);
    box-shadow: var(--shadow-glow);
}

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

.btn-outline:hover {
    background: var(--primary);
    color: #fff;
    transform: translateY(-3px);
}

/* White variant for dark backgrounds */
.btn-outline-white {
    background: transparent;
    color: #fff;
    border: 2px solid rgba(255,255,255,0.5);
}
.btn-outline-white:hover {
    background: #fff;
    color: var(--primary);
    transform: translateY(-3px);
}

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

.btn-accent:hover {
    background: var(--accent-light);
    color: #fff;
    transform: translateY(-3px);
}

.btn-lg { padding: 18px 40px; font-size: 1.1rem; }
.btn-sm { padding: 10px 20px; font-size: 0.85rem; }

.btn-icon {
    width: 48px;
    height: 48px;
    padding: 0;
    border-radius: 50%;
}

/* ── Hero Section ── */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    overflow: hidden;
    background: linear-gradient(135deg, #001A57 0%, #0033CC 50%, #0055FF 100%);
    color: #fff;
}

.hero-bg-gradient {
    position: absolute;
    top: -50%;
    right: -20%;
    width: 80%;
    height: 150%;
    background: radial-gradient(ellipse, rgba(0, 212, 170, 0.15) 0%, transparent 70%);
    pointer-events: none;
}

.hero-content {
    position: relative;
    z-index: 10;
    max-width: 650px;
    padding: 120px 0 80px;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 20px;
    background: rgba(255, 255, 255, 0.15);
    border: 1px solid rgba(255, 255, 255, 0.25);
    border-radius: var(--radius-full);
    font-size: 0.85rem;
    color: #fff;
    font-weight: 500;
    margin-bottom: 24px;
    animation: fadeInUp 0.6s ease;
}

.hero-badge i { font-size: 0.7rem; }

.hero h1 {
    font-size: clamp(2.5rem, 5vw, 3.8rem);
    font-weight: 800;
    line-height: 1.1;
    margin-bottom: 20px;
    color: #fff;
    animation: fadeInUp 0.6s ease 0.1s both;
}

.hero h1 .highlight {
    background: linear-gradient(135deg, #00D4AA, #FFD54F);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero p {
    font-size: 1.15rem;
    color: rgba(255, 255, 255, 0.8);
    line-height: 1.7;
    margin-bottom: 36px;
    animation: fadeInUp 0.6s ease 0.2s both;
}

.hero-buttons {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
    animation: fadeInUp 0.6s ease 0.3s both;
}

.hero-stats {
    display: flex;
    gap: 40px;
    margin-top: 48px;
    padding-top: 32px;
    border-top: 1px solid rgba(255,255,255,0.2);
    animation: fadeInUp 0.6s ease 0.4s both;
}

.hero-stat-number {
    font-family: var(--font-heading);
    font-size: 2rem;
    font-weight: 800;
    color: var(--accent);
}

.hero-stat-label {
    font-size: 0.85rem;
    color: rgba(255,255,255,0.7);
    margin-top: 4px;
}

/* Hero image / visual */
.hero-visual {
    position: absolute;
    right: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 45%;
    max-width: 600px;
    z-index: 5;
}

.hero-visual img {
    width: 100%;
    filter: drop-shadow(0 20px 40px rgba(0,200,150,0.15));
    animation: heroFloat 6s ease-in-out infinite;
}

/* Bubbles canvas */
#bubbles-canvas {
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 2;
    pointer-events: none;
}

.hero:hover #bubbles-canvas {
    pointer-events: auto;
}

/* Wave/bubble mask at bottom */
.hero-wave {
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 100%;
    z-index: 8;
    line-height: 0;
}

.hero-wave svg {
    width: 100%;
    height: 80px;
}

/* ── Section styling ── */
.section {
    padding: 100px 0;
    position: relative;
}

.section-dark { background: #FFFFFF; }
.section-darker { background: #F5F8FC; }

.section-header {
    text-align: center;
    max-width: 600px;
    margin: 0 auto 60px;
}

.section-label {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--primary);
    text-transform: uppercase;
    letter-spacing: 2px;
    margin-bottom: 16px;
}

.section-label::before,
.section-label::after {
    content: '';
    width: 30px;
    height: 1px;
    background: var(--primary);
    opacity: 0.4;
}

.section-header h2 {
    font-size: clamp(2rem, 4vw, 2.8rem);
    margin-bottom: 16px;
}

.section-header p {
    color: var(--text-muted);
    font-size: 1.05rem;
}

/* ── Cards ── */
.card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 32px;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 3px;
    background: linear-gradient(90deg, var(--primary), var(--accent));
    opacity: 0;
    transition: var(--transition);
}

.card:hover {
    background: #F0F5FF;
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
    border-color: var(--border-active);
}

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

.card-icon {
    width: 60px;
    height: 60px;
    border-radius: var(--radius);
    background: rgba(0, 200, 150, 0.1);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    color: var(--primary);
    margin-bottom: 20px;
    transition: var(--transition);
}

.card:hover .card-icon {
    background: var(--primary);
    color: #fff;
    transform: scale(1.1);
}

.card h3 {
    font-size: 1.3rem;
    margin-bottom: 12px;
}

.card p {
    color: var(--text-muted);
    font-size: 0.95rem;
}

/* ── Grid layouts ── */
.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 30px; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 30px; }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 30px; }

/* ── Kit/Pricing cards ── */
.kit-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-xl);
    padding: 40px 32px;
    text-align: center;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.kit-card.featured {
    border-color: var(--primary);
    box-shadow: 0 0 40px rgba(0, 85, 255, 0.1);
}

.kit-card.featured::before {
    content: '⭐ MÁS VENDIDO';
    position: absolute;
    top: 16px;
    right: -32px;
    background: var(--accent);
    color: var(--text-dark);
    font-size: 0.7rem;
    font-weight: 700;
    padding: 4px 40px;
    transform: rotate(45deg);
    letter-spacing: 1px;
}

.kit-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-lg);
}

.kit-name {
    font-size: 1.4rem;
    font-weight: 700;
    margin-bottom: 8px;
}

.kit-desc {
    color: var(--text-muted);
    font-size: 0.9rem;
    margin-bottom: 24px;
    min-height: 48px;
}

.kit-price {
    font-family: var(--font-heading);
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--primary);
    margin-bottom: 4px;
}

.kit-price-old {
    font-size: 1rem;
    color: var(--text-muted);
    text-decoration: line-through;
    margin-bottom: 24px;
}

.kit-features {
    text-align: left;
    margin-bottom: 32px;
}

.kit-features li {
    padding: 8px 0;
    font-size: 0.9rem;
    color: var(--text);
    display: flex;
    align-items: center;
    gap: 10px;
    border-bottom: 1px solid var(--border);
}

.kit-features li:last-child { border: none; }

.kit-features li i {
    color: var(--primary);
    font-size: 0.8rem;
}

/* ── Calculator Demo ── */
.calc-demo {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-xl);
    padding: 40px;
    box-shadow: var(--shadow-lg);
}

.calc-row {
    display: flex;
    gap: 20px;
    margin-bottom: 20px;
    align-items: end;
}

.calc-field {
    flex: 1;
}

.calc-field label {
    display: block;
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--text-muted);
    margin-bottom: 8px;
}

.calc-field select,
.calc-field input {
    width: 100%;
    padding: 14px 16px;
    background: var(--bg-input);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    color: var(--text);
    font-family: var(--font-body);
    font-size: 1rem;
    transition: var(--transition);
    outline: none;
}

.calc-field select:focus,
.calc-field input:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px var(--primary-glow);
}

.calc-results {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
    margin-top: 24px;
    padding-top: 24px;
    border-top: 1px solid var(--border);
}

.calc-result-item {
    text-align: center;
    padding: 20px;
    background: rgba(0, 200, 150, 0.05);
    border-radius: var(--radius);
    border: 1px solid rgba(0, 200, 150, 0.1);
}

.calc-result-value {
    font-family: var(--font-heading);
    font-size: 1.8rem;
    font-weight: 800;
    color: var(--primary);
}

.calc-result-value.profit { color: var(--accent); }

.calc-result-label {
    font-size: 0.8rem;
    color: var(--text-muted);
    margin-top: 4px;
}

/* ── Steps / How it works ── */
.steps-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 40px;
    position: relative;
}

.steps-grid::before {
    content: '';
    position: absolute;
    top: 40px;
    left: 20%;
    width: 60%;
    height: 2px;
    background: linear-gradient(90deg, var(--primary), var(--accent));
    opacity: 0.3;
}

.step {
    text-align: center;
    position: relative;
}

.step-number {
    width: 80px;
    height: 80px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    color: #fff;
    font-family: var(--font-heading);
    font-size: 2rem;
    font-weight: 800;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 24px;
    position: relative;
    z-index: 2;
    box-shadow: 0 0 30px var(--primary-glow);
}

.step h3 { font-size: 1.2rem; margin-bottom: 12px; }
.step p { color: var(--text-muted); font-size: 0.95rem; }

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

.faq-item {
    border: 1px solid var(--border);
    border-radius: var(--radius);
    margin-bottom: 12px;
    overflow: hidden;
    transition: var(--transition);
}

.faq-item.active { border-color: var(--border-active); }

.faq-question {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 20px 24px;
    cursor: pointer;
    font-weight: 600;
    font-size: 1rem;
    background: var(--bg-card);
    transition: var(--transition);
}

.faq-question:hover { background: var(--bg-card-hover); }

.faq-question i {
    color: var(--primary);
    transition: var(--transition);
    font-size: 0.8rem;
}

.faq-item.active .faq-question i { transform: rotate(180deg); }

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.4s ease;
    background: var(--bg-section);
}

.faq-item.active .faq-answer { max-height: 300px; }

.faq-answer p {
    padding: 16px 24px 24px;
    color: var(--text-muted);
    font-size: 0.95rem;
    line-height: 1.7;
}

/* ── Footer ── */
.footer {
    background: #001233;
    border-top: none;
    padding: 60px 0 30px;
    color: #C5D0E0;
}

.footer a { color: #C5D0E0; }
.footer a:hover { color: #fff; }
.footer .logo { color: #fff; }

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 40px;
    margin-bottom: 40px;
}

.footer-brand p {
    color: #8899AA;
    font-size: 0.9rem;
    margin-top: 16px;
    line-height: 1.7;
}

.footer h4 {
    font-size: 1rem;
    margin-bottom: 20px;
    color: #fff;
}

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

.footer-links a {
    color: #8899AA;
    font-size: 0.9rem;
    transition: var(--transition);
}

.footer-links a:hover {
    color: var(--primary);
    padding-left: 4px;
}

.footer-social {
    display: flex;
    gap: 12px;
    margin-top: 20px;
}

.footer-social a {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: rgba(255,255,255,0.08);
    display: flex;
    align-items: center;
    justify-content: center;
    color: #8899AA;
    transition: var(--transition);
}

.footer-social a:hover {
    background: var(--primary);
    color: #fff;
    transform: translateY(-3px);
}

.footer-bottom {
    text-align: center;
    padding-top: 30px;
    border-top: 1px solid rgba(255,255,255,0.1);
    color: #667788;
    font-size: 0.85rem;
}

/* ── Blog ── */
.blog-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 30px;
}

.blog-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 32px;
    transition: var(--transition);
}

.blog-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-lg);
    border-color: var(--border-active);
}

.blog-card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 16px;
}

.blog-cat {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--primary);
    background: rgba(0, 85, 255, 0.08);
    padding: 4px 12px;
    border-radius: var(--radius-full);
}

.blog-date {
    font-size: 0.8rem;
    color: var(--text-muted);
}

.blog-card-title {
    font-size: 1.25rem;
    margin-bottom: 12px;
    line-height: 1.35;
}

.blog-card-title a {
    color: var(--text-heading);
    transition: var(--transition);
}

.blog-card-title a:hover { color: var(--primary); }

.blog-card-excerpt {
    color: var(--text-muted);
    font-size: 0.9rem;
    line-height: 1.6;
    margin-bottom: 20px;
}

.blog-card-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: 16px;
    border-top: 1px solid var(--border);
}

.blog-time {
    font-size: 0.8rem;
    color: var(--text-muted);
}

.blog-read-more {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--primary);
    display: inline-flex;
    align-items: center;
    gap: 6px;
}

.blog-read-more:hover { gap: 10px; }

/* Article page */
.article-content {
    max-width: 780px;
    margin: 0 auto;
}

.article-content h2 {
    font-size: 1.6rem;
    margin: 40px 0 16px;
    color: var(--text-heading);
}

.article-content h3 {
    font-size: 1.2rem;
    margin: 32px 0 12px;
    color: var(--primary);
}

.article-content p {
    color: var(--text);
    font-size: 1rem;
    line-height: 1.8;
    margin-bottom: 20px;
}

.article-content ul, .article-content ol {
    margin: 16px 0 24px 24px;
    list-style: disc;
}

.article-content li {
    color: var(--text);
    font-size: 0.95rem;
    line-height: 1.7;
    margin-bottom: 8px;
}

.article-content strong { color: var(--text-heading); }

.article-cta {
    background: linear-gradient(135deg, #001A57, #0055FF);
    border-radius: var(--radius-xl);
    padding: 40px;
    text-align: center;
    color: #fff;
    margin: 48px 0;
}

.article-cta h3 { color: #fff; margin-bottom: 12px; }
.article-cta p { color: rgba(255,255,255,0.8); margin-bottom: 20px; }

.article-breadcrumb {
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-bottom: 24px;
}

.article-breadcrumb a { color: var(--primary); }

.article-meta {
    display: flex;
    align-items: center;
    gap: 20px;
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-bottom: 32px;
    padding-bottom: 24px;
    border-bottom: 1px solid var(--border);
}

/* ── Animations ── */
@keyframes fadeInUp {
    from { opacity: 0; transform: translateY(30px); }
    to { opacity: 1; transform: translateY(0); }
}

@keyframes heroFloat {
    0%, 100% { transform: translateY(-50%) translateX(0); }
    50% { transform: translateY(calc(-50% - 20px)) translateX(10px); }
}

@keyframes bubbleRise {
    0% { transform: translateY(100%) scale(0); opacity: 0; }
    10% { opacity: 0.6; }
    100% { transform: translateY(-100vh) scale(1); opacity: 0; }
}

/* Scroll animations */
.animate-on-scroll {
    opacity: 0;
    transform: translateY(40px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.animate-on-scroll.visible {
    opacity: 1;
    transform: translateY(0);
}

/* ── Responsive ── */
@media (max-width: 1024px) {
    .hero-visual { display: none; }
    .hero-content { max-width: 100%; }
    .grid-4 { grid-template-columns: repeat(2, 1fr); }
    .footer-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
    .nav-menu { 
        display: none;
        position: fixed;
        top: var(--header-h);
        left: 0;
        width: 100%;
        background: rgba(255,255,255,0.98);
        backdrop-filter: blur(20px);
        flex-direction: column;
        padding: 30px;
        gap: 20px;
        border-bottom: 1px solid var(--border);
        box-shadow: var(--shadow-lg);
    }
    .nav-menu.open a { color: var(--text) !important; }
    .nav-menu.open { display: flex; }
    .menu-toggle { display: flex; }
    .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
    .blog-grid { grid-template-columns: 1fr; }
    .steps-grid { grid-template-columns: 1fr; gap: 30px; }
    .steps-grid::before { display: none; }
    .hero-stats { flex-direction: column; gap: 20px; }
    .calc-row { flex-direction: column; }
    .calc-results { grid-template-columns: 1fr; }
    .hero-buttons { flex-direction: column; }
    .hero-buttons .btn { width: 100%; }
    .footer-grid { grid-template-columns: 1fr; }
    .section { padding: 60px 0; }
    .kit-card { padding: 30px 24px; }
    .article-cta { padding: 24px; }
}

@media (max-width: 480px) {
    .hero h1 { font-size: 2rem; }
    .section-header h2 { font-size: 1.8rem; }
}