/* ============================================================
   H2O2 SOLUTIONS — Main Stylesheet
   ============================================================ */

/* === CSS CUSTOM PROPERTIES === */
:root {
    --color-primary: #1e40af;
    --color-primary-light: #3b82f6;
    --color-primary-dark: #1e3a8a;
    --color-secondary: #0f172a;
    --color-accent: #0ea5e9;
    --color-success: #10b981;
    --color-warning: #f59e0b;
    --color-danger: #ef4444;

    --color-text: #1e293b;
    --color-text-light: #64748b;
    --color-text-muted: #94a3b8;
    --color-bg: #ffffff;
    --color-bg-light: #f8fafc;
    --color-bg-section: #f1f5f9;
    --color-border: #e2e8f0;

    --font-heading: 'Playfair Display', Georgia, serif;
    --font-body: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;

    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.08);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 30px rgba(0, 0, 0, 0.12);
    --shadow-xl: 0 20px 50px rgba(0, 0, 0, 0.15);

    --radius-sm: 6px;
    --radius-md: 12px;
    --radius-lg: 20px;
    --radius-full: 9999px;

    --transition: all 0.3s ease;
    --max-width: 1200px;
}

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

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

body {
    font-family: var(--font-body);
    color: var(--color-text);
    background: var(--color-bg);
    line-height: 1.7;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

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

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

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

ul, ol {
    list-style: none;
}

/* === CONTAINER === */
.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 24px;
}

/* === BUTTONS === */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 14px 32px;
    border-radius: var(--radius-sm);
    font-weight: 600;
    font-size: 15px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    cursor: pointer;
    border: 2px solid transparent;
    transition: var(--transition);
    text-decoration: none;
}

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

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

.btn-secondary {
    background: transparent;
    color: #ffffff;
    border-color: #ffffff;
}

.btn-secondary:hover {
    background: #ffffff;
    color: var(--color-primary);
    transform: translateY(-2px);
}

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

.btn-outline:hover {
    background: var(--color-primary);
    color: #ffffff;
    transform: translateY(-2px);
}

.btn-large {
    padding: 18px 40px;
    font-size: 16px;
}

.btn-full {
    width: 100%;
    padding: 16px 32px;
}

.btn-nav {
    background: var(--color-primary);
    color: #ffffff !important;
    padding: 10px 24px;
    border-radius: var(--radius-sm);
    text-transform: none;
    font-size: 14px;
    letter-spacing: 0;
}

.btn-nav:hover {
    background: var(--color-primary-dark);
    color: #ffffff !important;
    transform: translateY(-1px);
}

/* === HEADER / NAVIGATION === */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    transition: var(--transition);
}

.header.scrolled {
    box-shadow: var(--shadow-sm);
}

.navbar {
    padding: 16px 0;
}

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

.logo {
    display: flex;
    align-items: baseline;
    gap: 6px;
    font-size: 24px;
    font-weight: 800;
    color: var(--color-primary);
    text-decoration: none;
}

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

.logo-icon {
    font-family: var(--font-heading);
    font-size: 28px;
    background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.logo-text {
    font-family: var(--font-body);
    font-size: 16px;
    font-weight: 600;
    color: var(--color-text);
    -webkit-text-fill-color: var(--color-text);
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 8px;
}

.nav-links a {
    color: var(--color-text);
    font-size: 14px;
    font-weight: 500;
    padding: 8px 12px;
    border-radius: var(--radius-sm);
    transition: var(--transition);
}

.nav-links a:hover {
    color: var(--color-primary);
    background: rgba(30, 64, 175, 0.06);
}

.menu-toggle, .menu-icon {
    display: none;
}

/* === HERO SECTION === */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    background: linear-gradient(135deg, #0f172a 0%, #1e3a8a 40%, #1e40af 70%, #3b82f6 100%);
    padding: 120px 0 80px;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -20%;
    width: 800px;
    height: 800px;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(14, 165, 233, 0.15) 0%, transparent 70%);
    animation: float 8s ease-in-out infinite;
}

.hero::after {
    content: '';
    position: absolute;
    bottom: -30%;
    left: -10%;
    width: 600px;
    height: 600px;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(59, 130, 246, 0.1) 0%, transparent 70%);
    animation: float 10s ease-in-out infinite reverse;
}

@keyframes float {
    0%, 100% { transform: translateY(0) rotate(0deg); }
    50% { transform: translateY(-30px) rotate(5deg); }
}

.hero-content {
    position: relative;
    z-index: 2;
    text-align: center;
    max-width: 900px;
    margin: 0 auto;
}

.hero-title {
    font-family: var(--font-heading);
    font-size: clamp(40px, 6vw, 72px);
    font-weight: 800;
    color: #ffffff;
    line-height: 1.1;
    margin-bottom: 24px;
}

.hero-title span {
    display: block;
    font-family: var(--font-body);
    font-size: clamp(24px, 3vw, 36px);
    font-weight: 400;
    color: rgba(255, 255, 255, 0.7);
    margin-top: 8px;
}

.hero-subtitle {
    font-size: clamp(18px, 2vw, 22px);
    color: rgba(255, 255, 255, 0.9);
    font-weight: 400;
    margin-bottom: 16px;
    line-height: 1.6;
}

.hero-description {
    font-size: 16px;
    color: rgba(255, 255, 255, 0.65);
    max-width: 700px;
    margin: 0 auto 40px;
    line-height: 1.8;
}

.hero-buttons {
    display: flex;
    justify-content: center;
    gap: 16px;
    flex-wrap: wrap;
    margin-bottom: 60px;
}

.hero-stats {
    display: flex;
    justify-content: center;
    gap: 60px;
    flex-wrap: wrap;
}

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

.stat-number {
    display: block;
    font-size: 36px;
    font-weight: 800;
    color: #ffffff;
    font-family: var(--font-heading);
}

.stat-label {
    font-size: 14px;
    color: rgba(255, 255, 255, 0.6);
    text-transform: uppercase;
    letter-spacing: 1px;
}

/* === SECTIONS === */
.section {
    padding: 100px 0;
}

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

.section-white {
    background: var(--color-bg);
}

.section-header {
    text-align: center;
    max-width: 800px;
    margin: 0 auto 60px;
}

.section-badge {
    display: inline-block;
    padding: 6px 20px;
    background: rgba(30, 64, 175, 0.08);
    color: var(--color-primary);
    border-radius: var(--radius-full);
    font-size: 13px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1.5px;
    margin-bottom: 16px;
}

.section-badge-medical {
    background: rgba(239, 68, 68, 0.08);
    color: var(--color-danger);
}

.section-badge-disinfectant {
    background: rgba(16, 185, 129, 0.08);
    color: var(--color-success);
}

.section-badge-industrial {
    background: rgba(245, 158, 11, 0.08);
    color: var(--color-warning);
}

.section-badge-food {
    background: rgba(139, 92, 246, 0.08);
    color: #8b5cf6;
}

.section-badge-water {
    background: rgba(14, 165, 233, 0.08);
    color: var(--color-accent);
}

.section-title {
    font-family: var(--font-heading);
    font-size: clamp(28px, 4vw, 42px);
    font-weight: 700;
    color: var(--color-secondary);
    line-height: 1.2;
    margin-bottom: 16px;
}

.section-description {
    font-size: 17px;
    color: var(--color-text-light);
    line-height: 1.8;
}

/* === FEATURES GRID === */
.features-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}

.feature-card {
    background: #ffffff;
    border-radius: var(--radius-md);
    padding: 36px 28px;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
    border: 1px solid var(--color-border);
}

.feature-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: var(--color-primary-light);
}

.feature-icon {
    width: 64px;
    height: 64px;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 20px;
}

.feature-card h3 {
    font-size: 18px;
    font-weight: 700;
    color: var(--color-secondary);
    margin-bottom: 10px;
}

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

/* === MEDICAL SECTION === */
.medical-layout {
    display: grid;
    grid-template-columns: 1fr 300px;
    gap: 48px;
    align-items: start;
}

.medical-content {
    display: flex;
    flex-direction: column;
    gap: 32px;
}

.medical-item {
    display: flex;
    gap: 20px;
    padding: 28px;
    background: #ffffff;
    border-radius: var(--radius-md);
    border: 1px solid var(--color-border);
    transition: var(--transition);
}

.medical-item:hover {
    box-shadow: var(--shadow-md);
    border-color: rgba(239, 68, 68, 0.3);
}

.medical-number {
    flex-shrink: 0;
    width: 48px;
    height: 48px;
    background: linear-gradient(135deg, var(--color-danger), #f97316);
    color: #ffffff;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 800;
    font-size: 18px;
}

.medical-text h3 {
    font-size: 20px;
    font-weight: 700;
    color: var(--color-secondary);
    margin-bottom: 8px;
}

.medical-text p {
    font-size: 15px;
    color: var(--color-text-light);
    line-height: 1.7;
}

.medical-sidebar {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.sidebar-card {
    background: #ffffff;
    border-radius: var(--radius-md);
    padding: 28px;
    border: 1px solid var(--color-border);
    box-shadow: var(--shadow-sm);
}

.sidebar-card h4 {
    font-size: 17px;
    font-weight: 700;
    color: var(--color-secondary);
    margin-bottom: 12px;
    padding-bottom: 10px;
    border-bottom: 2px solid var(--color-border);
}

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

.concentration-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 13px;
}

.concentration-table th {
    background: var(--color-bg-section);
    padding: 8px 10px;
    text-align: left;
    font-weight: 600;
    font-size: 12px;
    text-transform: uppercase;
    color: var(--color-text-muted);
    letter-spacing: 0.5px;
}

.concentration-table td {
    padding: 8px 10px;
    border-bottom: 1px solid var(--color-border);
    color: var(--color-text);
}

/* === DISINFECTANT SECTION === */
.disinfectant-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
    margin-bottom: 48px;
}

.disinfectant-card {
    background: #ffffff;
    border-radius: var(--radius-md);
    border: 1px solid var(--color-border);
    overflow: hidden;
    transition: var(--transition);
}

.disinfectant-card:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

.disinfectant-card-header {
    background: linear-gradient(135deg, var(--color-success), #059669);
    padding: 20px 24px;
}

.disinfectant-card-header h3 {
    color: #ffffff;
    font-size: 18px;
    font-weight: 700;
}

.disinfectant-card-body {
    padding: 24px;
}

.disinfectant-card-body p {
    font-size: 14px;
    color: var(--color-text-light);
    line-height: 1.7;
    margin-bottom: 16px;
}

.disinfectant-list {
    list-style: none;
}

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

.disinfectant-list li::before {
    content: '\2713';
    position: absolute;
    left: 0;
    color: var(--color-success);
    font-weight: 700;
}

.disinfectant-highlight {
    background: #ffffff;
    border-radius: var(--radius-md);
    padding: 40px;
    border: 1px solid var(--color-border);
}

.disinfectant-highlight h3 {
    text-align: center;
    font-size: 24px;
    font-weight: 700;
    color: var(--color-secondary);
    margin-bottom: 28px;
    font-family: var(--font-heading);
}

.comparison-table-wrapper {
    overflow-x: auto;
}

.comparison-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 14px;
}

.comparison-table thead th {
    background: var(--color-secondary);
    color: #ffffff;
    padding: 14px 16px;
    text-align: left;
    font-weight: 600;
    font-size: 13px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.comparison-table thead th:first-child {
    border-radius: var(--radius-sm) 0 0 0;
}

.comparison-table thead th:last-child {
    border-radius: 0 var(--radius-sm) 0 0;
}

.comparison-table td {
    padding: 12px 16px;
    border-bottom: 1px solid var(--color-border);
}

.comparison-table tbody tr:nth-child(even) {
    background: var(--color-bg-light);
}

.check {
    color: var(--color-success);
    font-weight: 600;
}

.cross {
    color: var(--color-danger);
    font-weight: 600;
}

.partial {
    color: var(--color-warning);
    font-weight: 600;
}

/* === INDUSTRIAL SECTION === */
.industrial-tabs {
    background: #ffffff;
    border-radius: var(--radius-md);
    border: 1px solid var(--color-border);
    padding: 40px;
    margin-bottom: 40px;
    min-height: 200px;
}

.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
}

.tab-content h3 {
    font-size: 24px;
    font-weight: 700;
    color: var(--color-secondary);
    margin-bottom: 16px;
    font-family: var(--font-heading);
}

.tab-content p {
    font-size: 16px;
    color: var(--color-text-light);
    line-height: 1.8;
    max-width: 800px;
}

.tab-nav {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 8px;
    margin-bottom: 40px;
}

.tab-btn {
    padding: 12px 24px;
    border: 2px solid var(--color-border);
    background: #ffffff;
    color: var(--color-text);
    font-size: 14px;
    font-weight: 600;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: var(--transition);
    font-family: var(--font-body);
}

.tab-btn:hover {
    border-color: var(--color-primary);
    color: var(--color-primary);
}

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

.industrial-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
    text-align: center;
}

.ind-stat {
    background: #ffffff;
    border-radius: var(--radius-md);
    padding: 32px 20px;
    border: 1px solid var(--color-border);
}

.ind-stat-number {
    display: block;
    font-size: 42px;
    font-weight: 800;
    color: var(--color-primary);
    font-family: var(--font-heading);
    margin-bottom: 8px;
}

.ind-stat-label {
    font-size: 14px;
    color: var(--color-text-light);
    font-weight: 500;
}

/* === FOOD SECTION === */
.food-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.food-card {
    background: #ffffff;
    border-radius: var(--radius-md);
    padding: 32px 28px;
    border: 1px solid var(--color-border);
    transition: var(--transition);
}

.food-card:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-3px);
    border-color: #8b5cf6;
}

.food-card h3 {
    font-size: 18px;
    font-weight: 700;
    color: var(--color-secondary);
    margin-bottom: 12px;
    padding-bottom: 12px;
    border-bottom: 2px solid var(--color-border);
}

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

/* === WATER SECTION === */
.water-content {
    display: grid;
    grid-template-columns: 1fr 280px;
    gap: 48px;
    align-items: start;
}

.water-main {
    display: flex;
    flex-direction: column;
    gap: 28px;
}

.water-item {
    background: #ffffff;
    border-radius: var(--radius-md);
    padding: 28px;
    border: 1px solid var(--color-border);
    border-left: 4px solid var(--color-accent);
    transition: var(--transition);
}

.water-item:hover {
    box-shadow: var(--shadow-sm);
}

.water-item h3 {
    font-size: 20px;
    font-weight: 700;
    color: var(--color-secondary);
    margin-bottom: 10px;
}

.water-item p {
    font-size: 15px;
    color: var(--color-text-light);
    line-height: 1.7;
}

.water-sidebar {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.env-card {
    background: linear-gradient(135deg, #ecfdf5, #f0fdf4);
    border-radius: var(--radius-md);
    padding: 28px;
    border: 1px solid #a7f3d0;
}

.env-card h4 {
    font-size: 17px;
    font-weight: 700;
    color: var(--color-success);
    margin-bottom: 16px;
}

.env-list {
    list-style: none;
}

.env-list li {
    font-size: 14px;
    color: var(--color-text);
    padding: 8px 0;
    padding-left: 0;
    line-height: 1.6;
    border-bottom: 1px solid rgba(167, 243, 208, 0.5);
}

.env-list li:last-child {
    border-bottom: none;
}

.env-list strong {
    color: var(--color-success);
}

/* === GRADES TABLE === */
.grades-table-wrapper {
    overflow-x: auto;
}

.grades-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 14px;
    background: #ffffff;
    border-radius: var(--radius-md);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
}

.grades-table thead th {
    background: linear-gradient(135deg, var(--color-primary), var(--color-primary-light));
    color: #ffffff;
    padding: 16px 20px;
    text-align: left;
    font-weight: 600;
    font-size: 13px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.grades-table tbody td {
    padding: 14px 20px;
    border-bottom: 1px solid var(--color-border);
    color: var(--color-text);
}

.grades-table tbody tr:last-child td {
    border-bottom: none;
}

.grades-table tbody tr:hover {
    background: var(--color-bg-light);
}

/* === CTA SECTION === */
.section-cta {
    background: linear-gradient(135deg, #0f172a 0%, #1e3a8a 50%, #3b82f6 100%);
    padding: 80px 0;
    text-align: center;
}

.cta-content {
    max-width: 700px;
    margin: 0 auto;
}

.cta-title {
    font-family: var(--font-heading);
    font-size: clamp(28px, 4vw, 40px);
    font-weight: 700;
    color: #ffffff;
    margin-bottom: 16px;
}

.cta-description {
    font-size: 17px;
    color: rgba(255, 255, 255, 0.8);
    line-height: 1.8;
    margin-bottom: 32px;
}

.cta-buttons {
    display: flex;
    justify-content: center;
    gap: 16px;
    flex-wrap: wrap;
    margin-bottom: 40px;
}

.cta-features {
    display: flex;
    justify-content: center;
    gap: 32px;
    flex-wrap: wrap;
}

.cta-feature {
    display: flex;
    align-items: center;
    gap: 8px;
    color: rgba(255, 255, 255, 0.85);
    font-size: 14px;
    font-weight: 500;
}

.cta-feature-icon {
    color: var(--color-success);
    font-size: 18px;
    font-weight: 700;
}

/* === CONTACT SECTION === */
.contact-layout {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 48px;
    align-items: start;
}

.contact-info {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.contact-card {
    background: var(--color-bg-light);
    border-radius: var(--radius-md);
    padding: 28px;
    border: 1px solid var(--color-border);
}

.contact-card h3 {
    font-size: 18px;
    font-weight: 700;
    color: var(--color-secondary);
    margin-bottom: 14px;
    padding-bottom: 10px;
    border-bottom: 2px solid var(--color-border);
}

.contact-card p {
    font-size: 14px;
    color: var(--color-text-light);
    line-height: 2;
}

.contact-form {
    background: #ffffff;
    border-radius: var(--radius-md);
    padding: 36px;
    border: 1px solid var(--color-border);
    box-shadow: var(--shadow-sm);
}

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

.form-group label {
    display: block;
    font-size: 14px;
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: 6px;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 12px 16px;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    font-family: var(--font-body);
    font-size: 14px;
    color: var(--color-text);
    background: #ffffff;
    transition: var(--transition);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(30, 64, 175, 0.1);
}

.form-group textarea {
    resize: vertical;
    min-height: 120px;
}

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

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

.faq-item:hover {
    box-shadow: var(--shadow-sm);
}

.faq-item summary {
    padding: 20px 24px;
    font-size: 16px;
    color: var(--color-text);
    cursor: pointer;
    list-style: none;
    position: relative;
    padding-right: 40px;
}

.faq-item summary::-webkit-details-marker {
    display: none;
}

.faq-item summary::after {
    content: '+';
    position: absolute;
    right: 24px;
    top: 50%;
    transform: translateY(-50%);
    font-size: 22px;
    font-weight: 300;
    color: var(--color-primary);
    transition: var(--transition);
}

.faq-item[open] summary::after {
    content: '\2212';
}

.faq-item[open] summary {
    background: var(--color-bg-light);
}

.faq-item summary:focus {
    outline: 2px solid var(--color-primary-light);
    outline-offset: -2px;
}

.faq-item p {
    padding: 0 24px 20px;
    font-size: 15px;
    color: var(--color-text-light);
    line-height: 1.8;
}

/* === FOOTER === */
.footer {
    background: var(--color-secondary);
    color: #ffffff;
    padding: 60px 0 0;
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 40px;
    padding-bottom: 40px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-brand p {
    font-size: 14px;
    color: rgba(255, 255, 255, 0.6);
    line-height: 1.7;
    margin-top: 16px;
    max-width: 320px;
}

.footer-brand .logo-icon {
    font-family: var(--font-heading);
    font-size: 28px;
    background: linear-gradient(135deg, var(--color-primary-light), var(--color-accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.footer-brand .logo-text {
    font-family: var(--font-body);
    font-size: 16px;
    font-weight: 600;
    color: rgba(255, 255, 255, 0.9);
    margin-left: 6px;
}

.footer-brand {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
}

.footer-links h4 {
    font-size: 15px;
    font-weight: 700;
    color: #ffffff;
    margin-bottom: 16px;
    text-transform: uppercase;
    letter-spacing: 1px;
}

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

.footer-links ul li a {
    color: rgba(255, 255, 255, 0.6);
    font-size: 14px;
    transition: var(--transition);
}

.footer-links ul li a:hover {
    color: #ffffff;
}

.footer-links ul li {
    color: rgba(255, 255, 255, 0.6);
    font-size: 14px;
    line-height: 1.7;
}

.footer-bottom {
    text-align: center;
    padding: 24px 0;
    font-size: 13px;
    color: rgba(255, 255, 255, 0.4);
}

.footer-bottom p {
    margin-bottom: 4px;
}

.footer-disclaimer {
    font-size: 12px;
    color: rgba(255, 255, 255, 0.3);
    max-width: 800px;
    margin: 8px auto 0;
    line-height: 1.6;
}

/* === RESPONSIVE DESIGN === */
@media (max-width: 1024px) {
    .features-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .medical-layout {
        grid-template-columns: 1fr;
    }

    .medical-sidebar {
        flex-direction: row;
    }

    .sidebar-card {
        flex: 1;
    }

    .water-content {
        grid-template-columns: 1fr;
    }

    .water-sidebar {
        flex-direction: row;
    }

    .footer-grid {
        grid-template-columns: 1fr 1fr;
    }
}

@media (max-width: 768px) {
    .section {
        padding: 60px 0;
    }

    /* Mobile Navigation */
    .menu-icon {
        display: block;
        font-size: 28px;
        cursor: pointer;
        color: var(--color-text);
        padding: 4px;
    }

    .menu-toggle {
        display: none;
    }

    .nav-links {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: #ffffff;
        flex-direction: column;
        padding: 20px;
        box-shadow: var(--shadow-lg);
        gap: 4px;
        border-top: 1px solid var(--color-border);
    }

    .nav-links.active {
        display: flex;
    }

    .nav-links a {
        padding: 12px 16px;
        width: 100%;
        border-radius: var(--radius-sm);
    }

    .btn-nav {
        text-align: center;
        margin-top: 8px;
    }

    .features-grid {
        grid-template-columns: 1fr;
    }

    .disinfectant-grid {
        grid-template-columns: 1fr;
    }

    .food-grid {
        grid-template-columns: 1fr;
    }

    .contact-layout {
        grid-template-columns: 1fr;
    }

    .medical-sidebar {
        flex-direction: column;
    }

    .water-sidebar {
        flex-direction: column;
    }

    .hero-stats {
        gap: 30px;
    }

    .stat-number {
        font-size: 28px;
    }

    .industrial-stats {
        grid-template-columns: 1fr;
    }

    .tab-nav {
        flex-direction: column;
        align-items: center;
    }

    .tab-btn {
        width: 100%;
        max-width: 280px;
    }

    .footer-grid {
        grid-template-columns: 1fr;
        gap: 32px;
    }

    .industrial-tabs {
        padding: 28px 20px;
    }

    .comparison-table {
        font-size: 12px;
    }

    .comparison-table th,
    .comparison-table td {
        padding: 8px 10px;
    }

    .cta-features {
        gap: 16px;
    }

    .hero-buttons {
        flex-direction: column;
        align-items: center;
    }

    .cta-buttons {
        flex-direction: column;
        align-items: center;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 16px;
    }

    .hero {
        padding: 100px 0 60px;
    }

    .medical-item {
        flex-direction: column;
        gap: 12px;
    }

    .medical-number {
        align-self: flex-start;
    }

    .contact-form {
        padding: 24px 20px;
    }

    .disinfectant-highlight {
        padding: 24px 20px;
    }
}

/* === PRINT STYLES === */
@media print {
    .header, .hero, .section-cta {
        display: none;
    }

    body {
        font-size: 12pt;
        color: #000;
    }

    .section {
        padding: 20px 0;
        page-break-inside: avoid;
    }
}