/* ============================================
   N-Tech Solar — Main Stylesheet
   Professional, clean, mobile-first design
   ============================================ */

/* ---------- Google Fonts ---------- */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=Outfit:wght@400;500;600;700;800&display=swap');

/* ---------- CSS Variables ---------- */
:root {
    --primary-dark: #0a1628;
    --primary: #1a2d4a;
    --primary-light: #2a4a6b;
    --accent: #f59e0b;
    --accent-hover: #d97706;
    --accent-light: #fbbf24;
    --success: #10b981;
    --danger: #ef4444;
    --warning: #f59e0b;
    --info: #3b82f6;

    --bg-light: #f8fafc;
    --bg-white: #ffffff;
    --bg-section: #f1f5f9;

    --text-dark: #0f172a;
    --text-body: #334155;
    --text-light: #64748b;
    --text-muted: #94a3b8;
    --text-white: #ffffff;

    --border-color: #e2e8f0;
    --border-light: #f1f5f9;

    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow: 0 1px 3px rgba(0, 0, 0, 0.1), 0 1px 2px rgba(0, 0, 0, 0.06);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);

    --radius-sm: 6px;
    --radius: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --radius-full: 9999px;

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

    --transition: all 0.3s ease;
    --container-width: 1200px;
    --header-height: 80px;
}

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

html {
    scroll-behavior: smooth;
    font-size: 16px;
    -webkit-text-size-adjust: 100%;
}

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

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

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

ul, ol {
    list-style: none;
}

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

h1 { font-size: 2.75rem; }
h2 { font-size: 2.25rem; }
h3 { font-size: 1.5rem; }
h4 { font-size: 1.25rem; }
h5 { font-size: 1.1rem; }

p { margin-bottom: 1rem; }

input, textarea, select, button {
    font-family: var(--font-body);
    font-size: 1rem;
}

/* ---------- Utility ---------- */
.container {
    width: 100%;
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 1.5rem;
}

.section {
    padding: 5rem 0;
}

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

.section-dark {
    background-color: var(--primary-dark);
    color: var(--text-white);
}

.section-header {
    text-align: center;
    margin-bottom: 3.5rem;
}

.section-label {
    display: inline-block;
    font-size: 0.8rem;
    font-weight: 600;
    letter-spacing: 2px;
    text-transform: uppercase;
    color: var(--accent);
    margin-bottom: 0.75rem;
}

.section-title {
    font-size: 2.25rem;
    font-weight: 800;
    margin-bottom: 1rem;
}

.section-dark .section-title {
    color: var(--text-white);
}

.section-subtitle {
    font-size: 1.1rem;
    color: var(--text-light);
    max-width: 600px;
    margin: 0 auto;
}

.section-dark .section-subtitle {
    color: var(--text-muted);
}

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

/* ---------- Buttons ---------- */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.8rem 1.8rem;
    font-size: 0.95rem;
    font-weight: 600;
    border: none;
    border-radius: var(--radius);
    cursor: pointer;
    transition: var(--transition);
    white-space: nowrap;
    text-decoration: none;
}

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

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

.btn-primary {
    background-color: var(--accent);
    color: var(--primary-dark);
}

.btn-primary:hover {
    background-color: var(--accent-hover);
    color: var(--text-white);
}

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

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

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

.btn-outline:hover {
    background-color: var(--primary);
    color: var(--text-white);
}

.btn-outline-light {
    background: transparent;
    color: var(--text-white);
    border: 2px solid rgba(255,255,255,0.3);
}

.btn-outline-light:hover {
    background: rgba(255,255,255,0.1);
    border-color: var(--text-white);
}

.btn-whatsapp {
    background-color: #25D366;
    color: var(--text-white);
}

.btn-whatsapp:hover {
    background-color: #128C7E;
    color: var(--text-white);
}

.btn-sm {
    padding: 0.5rem 1.2rem;
    font-size: 0.85rem;
}

.btn-lg {
    padding: 1rem 2.2rem;
    font-size: 1.05rem;
}

/* ---------- Header / Navbar ---------- */
.header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    background: var(--bg-white);
    border-bottom: 1px solid var(--border-color);
    transition: var(--transition);
}

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

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: var(--header-height);
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 1.5rem;
}

.header-logo img {
    height: 50px;
    width: auto;
}

.header-nav {
    display: flex;
    align-items: center;
    gap: 2rem;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 0.25rem;
}

.nav-links a {
    padding: 0.5rem 0.9rem;
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--text-body);
    border-radius: var(--radius-sm);
    transition: var(--transition);
}

.nav-links a:hover,
.nav-links a.active {
    color: var(--accent);
    background-color: rgba(245, 158, 11, 0.08);
}

.header-actions {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.header-phone {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--primary);
    padding: 0.5rem 1rem;
    border-radius: var(--radius-full);
    background: rgba(245, 158, 11, 0.1);
    transition: var(--transition);
}

.header-phone:hover {
    background: rgba(245, 158, 11, 0.2);
}

.header-phone i {
    color: var(--accent);
}

.header-cta {
    padding: 0.6rem 1.4rem;
    font-size: 0.85rem;
}

/* Mobile Menu Toggle */
.menu-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.5rem;
    z-index: 1010;
}

.menu-toggle span {
    display: block;
    width: 24px;
    height: 2.5px;
    background-color: var(--primary-dark);
    border-radius: 2px;
    transition: var(--transition);
}

.menu-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

.menu-toggle.active span:nth-child(2) {
    opacity: 0;
}

.menu-toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
}

/* ---------- Hero Section ---------- */
.hero {
    position: relative;
    min-height: 90vh;
    display: flex;
    align-items: center;
    background-color: var(--primary-dark);
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    margin-top: var(--header-height);
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, rgba(10, 22, 40, 0.92) 0%, rgba(26, 45, 74, 0.85) 50%, rgba(10, 22, 40, 0.75) 100%);
    z-index: 1;
}

.hero-content {
    position: relative;
    z-index: 2;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
    align-items: center;
    padding: 4rem 0;
}

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

.hero-label {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.8rem;
    font-weight: 600;
    letter-spacing: 2.5px;
    text-transform: uppercase;
    color: var(--accent);
    margin-bottom: 1.5rem;
}

.hero-label::before {
    content: '';
    display: inline-block;
    width: 30px;
    height: 3px;
    background-color: var(--accent);
    border-radius: 2px;
}

.hero-title {
    font-size: 3.2rem;
    font-weight: 800;
    color: var(--text-white);
    margin-bottom: 1.5rem;
    line-height: 1.15;
}

.hero-title .highlight {
    color: var(--accent);
}

.hero-description {
    font-size: 1.1rem;
    color: rgba(255, 255, 255, 0.75);
    margin-bottom: 2rem;
    line-height: 1.7;
}

.hero-buttons {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
}

.hero-stats {
    display: flex;
    gap: 2.5rem;
    margin-top: 3rem;
    padding-top: 2rem;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

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

.hero-stat-value {
    font-family: var(--font-heading);
    font-size: 2rem;
    font-weight: 800;
    color: var(--accent);
    line-height: 1;
    margin-bottom: 0.3rem;
}

.hero-stat-label {
    font-size: 0.8rem;
    color: rgba(255, 255, 255, 0.5);
    text-transform: uppercase;
    letter-spacing: 1px;
}

/* ---------- Calculator Section ---------- */
.calculator-card {
    background: var(--bg-white);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-xl);
    padding: 2.5rem;
    max-width: 480px;
    width: 100%;
}

.calculator-header {
    margin-bottom: 2rem;
}

.calculator-header .calc-label {
    font-size: 0.75rem;
    font-weight: 600;
    letter-spacing: 1.5px;
    text-transform: uppercase;
    color: var(--accent);
    margin-bottom: 0.5rem;
}

.calculator-header h3 {
    font-size: 1.3rem;
    color: var(--text-dark);
}

.calc-row {
    margin-bottom: 1.5rem;
}

.calc-row label {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.9rem;
    color: var(--text-body);
    margin-bottom: 0.75rem;
}

.calc-row label span {
    font-weight: 700;
    color: var(--primary-dark);
    font-family: var(--font-heading);
}

/* System Type Tabs */
.system-tabs {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 1.5rem;
}

.system-tab {
    flex: 1;
    padding: 0.7rem 0.5rem;
    font-size: 0.82rem;
    font-weight: 600;
    text-align: center;
    border: 2px solid var(--border-color);
    border-radius: var(--radius);
    background: transparent;
    color: var(--text-body);
    cursor: pointer;
    transition: var(--transition);
}

.system-tab:hover {
    border-color: var(--accent);
    color: var(--accent);
}

.system-tab.active {
    background-color: var(--primary-dark);
    border-color: var(--primary-dark);
    color: var(--text-white);
}

/* Range Slider */
.range-slider {
    -webkit-appearance: none;
    appearance: none;
    width: 100%;
    height: 6px;
    border-radius: 3px;
    background: var(--border-color);
    outline: none;
    transition: var(--transition);
}

.range-slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 22px;
    height: 22px;
    border-radius: 50%;
    background: var(--accent);
    cursor: pointer;
    border: 3px solid var(--bg-white);
    box-shadow: 0 2px 6px rgba(245, 158, 11, 0.4);
    transition: var(--transition);
}

.range-slider::-webkit-slider-thumb:hover {
    transform: scale(1.15);
}

.range-slider::-moz-range-thumb {
    width: 22px;
    height: 22px;
    border-radius: 50%;
    background: var(--accent);
    cursor: pointer;
    border: 3px solid var(--bg-white);
    box-shadow: 0 2px 6px rgba(245, 158, 11, 0.4);
}

/* Calculator Results */
.calc-results {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.75rem;
    margin-top: 1.5rem;
}

.calc-result-box {
    background: var(--bg-section);
    border-radius: var(--radius);
    padding: 1rem 1.2rem;
    border: 1px solid var(--border-color);
}

.calc-result-label {
    font-size: 0.75rem;
    color: var(--text-light);
    margin-bottom: 0.25rem;
}

.calc-result-value {
    font-family: var(--font-heading);
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--primary-dark);
}

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

.calc-note {
    margin-top: 1rem;
    font-size: 0.75rem;
    color: var(--text-muted);
    text-align: center;
    font-style: italic;
}

/* ---------- Stats Bar ---------- */
.stats-bar {
    background-color: var(--bg-white);
    border-top: 1px solid var(--border-color);
    border-bottom: 1px solid var(--border-color);
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    text-align: center;
    padding: 2.5rem 0;
}

.stat-item {
    padding: 1rem;
    position: relative;
}

.stat-item:not(:last-child)::after {
    content: '';
    position: absolute;
    right: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 1px;
    height: 50%;
    background-color: var(--border-color);
}

.stat-value {
    font-family: var(--font-heading);
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--primary-dark);
    line-height: 1;
    margin-bottom: 0.3rem;
}

.stat-value .suffix {
    color: var(--accent);
}

.stat-label {
    font-size: 0.85rem;
    color: var(--text-light);
    font-weight: 500;
}

/* ---------- About Section (Home) ---------- */
.about-preview {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
}

.about-image {
    position: relative;
    border-radius: var(--radius-lg);
    overflow: hidden;
}

.about-image img {
    width: 100%;
    height: 400px;
    object-fit: cover;
    border-radius: var(--radius-lg);
}

.about-image-badge {
    position: absolute;
    bottom: 1.5rem;
    left: 1.5rem;
    background: var(--accent);
    color: var(--primary-dark);
    padding: 1rem 1.5rem;
    border-radius: var(--radius);
    font-weight: 700;
    font-family: var(--font-heading);
    font-size: 0.95rem;
    box-shadow: var(--shadow-lg);
}

.about-text .section-label {
    text-align: left;
}

.about-text h2 {
    margin-bottom: 1.5rem;
}

.about-text p {
    color: var(--text-light);
    margin-bottom: 1.5rem;
    line-height: 1.8;
}

.about-features {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
    margin: 1.5rem 0;
}

.about-feature {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--text-dark);
}

.about-feature i {
    color: var(--accent);
    font-size: 1.1rem;
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(245, 158, 11, 0.1);
    border-radius: var(--radius-sm);
    flex-shrink: 0;
}

/* ---------- Services Grid ---------- */
.services-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
}

.service-card {
    background: var(--bg-white);
    border-radius: var(--radius-md);
    padding: 2rem;
    border: 1px solid var(--border-color);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.service-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: var(--accent);
    transform: scaleX(0);
    transform-origin: left;
    transition: var(--transition);
}

.service-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
    border-color: transparent;
}

.service-card:hover::before {
    transform: scaleX(1);
}

.service-icon {
    width: 56px;
    height: 56px;
    border-radius: var(--radius-md);
    background: linear-gradient(135deg, rgba(245, 158, 11, 0.1), rgba(245, 158, 11, 0.05));
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1.5rem;
}

.service-icon i {
    font-size: 1.4rem;
    color: var(--accent);
}

.service-card h3 {
    font-size: 1.15rem;
    margin-bottom: 0.75rem;
}

.service-card p {
    color: var(--text-light);
    font-size: 0.9rem;
    line-height: 1.7;
}

.service-card-img {
    width: 100%;
    height: 200px;
    object-fit: cover;
    border-radius: var(--radius);
    margin-bottom: 1.5rem;
}

/* ---------- Products Grid ---------- */
.products-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1.5rem;
}

.product-card {
    background: var(--bg-white);
    border-radius: var(--radius-md);
    overflow: hidden;
    border: 1px solid var(--border-color);
    transition: var(--transition);
}

.product-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.product-card-img {
    width: 100%;
    height: 200px;
    object-fit: cover;
    background: var(--bg-section);
    display: flex;
    align-items: center;
    justify-content: center;
}

.product-card-img i {
    font-size: 3rem;
    color: var(--text-muted);
}

.product-card-body {
    padding: 1.5rem;
}

.product-category {
    display: inline-block;
    font-size: 0.7rem;
    font-weight: 600;
    letter-spacing: 1px;
    text-transform: uppercase;
    color: var(--accent);
    background: rgba(245, 158, 11, 0.1);
    padding: 0.25rem 0.6rem;
    border-radius: var(--radius-sm);
    margin-bottom: 0.75rem;
}

.product-card h4 {
    font-size: 1rem;
    margin-bottom: 0.5rem;
}

.product-card p {
    font-size: 0.85rem;
    color: var(--text-light);
    margin-bottom: 1rem;
    line-height: 1.6;
}

.product-price {
    font-family: var(--font-heading);
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--primary-dark);
}

/* ---------- Projects Grid ---------- */
.projects-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
}

.project-card {
    position: relative;
    border-radius: var(--radius-md);
    overflow: hidden;
    cursor: pointer;
    group: true;
}

.project-card img {
    width: 100%;
    height: 280px;
    object-fit: cover;
    transition: transform 0.5s ease;
}

.project-card:hover img {
    transform: scale(1.05);
}

.project-overlay {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    padding: 2rem 1.5rem;
    background: linear-gradient(transparent, rgba(10, 22, 40, 0.9));
    color: var(--text-white);
    transition: var(--transition);
}

.project-category-tag {
    display: inline-block;
    font-size: 0.7rem;
    font-weight: 600;
    letter-spacing: 1px;
    text-transform: uppercase;
    color: var(--accent);
    margin-bottom: 0.5rem;
}

.project-overlay h3 {
    color: var(--text-white);
    font-size: 1.15rem;
    margin-bottom: 0.3rem;
}

.project-overlay p {
    font-size: 0.85rem;
    color: rgba(255, 255, 255, 0.7);
    margin: 0;
}

/* ---------- Reviews Section ---------- */
.reviews-slider {
    position: relative;
    overflow: hidden;
}

.reviews-track {
    display: flex;
    transition: transform 0.5s ease;
}

.review-card {
    min-width: calc(33.333% - 1.33rem);
    margin-right: 2rem;
    background: var(--bg-white);
    border-radius: var(--radius-md);
    padding: 2rem;
    border: 1px solid var(--border-color);
}

.review-stars {
    display: flex;
    gap: 0.2rem;
    margin-bottom: 1rem;
}

.review-stars i {
    color: var(--accent);
    font-size: 0.9rem;
}

.review-text {
    font-size: 0.95rem;
    color: var(--text-body);
    line-height: 1.7;
    margin-bottom: 1.5rem;
    font-style: italic;
}

.review-author {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.review-avatar {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--accent), var(--accent-hover));
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-white);
    font-weight: 700;
    font-size: 1.1rem;
    flex-shrink: 0;
}

.review-avatar img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: 50%;
}

.review-author-info h4 {
    font-size: 0.95rem;
    margin-bottom: 0.15rem;
}

.review-author-info p {
    font-size: 0.8rem;
    color: var(--text-muted);
    margin: 0;
}

.reviews-nav {
    display: flex;
    justify-content: center;
    gap: 1rem;
    margin-top: 2rem;
}

.reviews-nav button {
    width: 44px;
    height: 44px;
    border-radius: 50%;
    border: 2px solid var(--border-color);
    background: var(--bg-white);
    color: var(--text-body);
    font-size: 1rem;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
}

.reviews-nav button:hover {
    background: var(--accent);
    border-color: var(--accent);
    color: var(--text-white);
}

/* ---------- Blog Cards ---------- */
.blog-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
}

.blog-card {
    background: var(--bg-white);
    border-radius: var(--radius-md);
    overflow: hidden;
    border: 1px solid var(--border-color);
    transition: var(--transition);
}

.blog-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.blog-card-img {
    width: 100%;
    height: 220px;
    object-fit: cover;
    background-color: var(--bg-section);
}

.blog-card-body {
    padding: 1.5rem;
}

.blog-meta {
    display: flex;
    align-items: center;
    gap: 1rem;
    font-size: 0.8rem;
    color: var(--text-muted);
    margin-bottom: 0.75rem;
}

.blog-meta span {
    display: flex;
    align-items: center;
    gap: 0.3rem;
}

.blog-card h3 {
    font-size: 1.1rem;
    margin-bottom: 0.75rem;
    line-height: 1.4;
}

.blog-card h3 a:hover {
    color: var(--accent);
}

.blog-card p {
    font-size: 0.9rem;
    color: var(--text-light);
    line-height: 1.6;
    margin-bottom: 1rem;
}

.blog-read-more {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--accent);
    display: inline-flex;
    align-items: center;
    gap: 0.3rem;
}

.blog-read-more:hover {
    gap: 0.6rem;
}

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

.faq-item {
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    margin-bottom: 0.75rem;
    overflow: hidden;
    transition: var(--transition);
}

.faq-item.active {
    border-color: var(--accent);
    box-shadow: 0 0 0 1px var(--accent);
}

.faq-question {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1.25rem 1.5rem;
    cursor: pointer;
    font-weight: 600;
    color: var(--text-dark);
    font-size: 0.95rem;
    gap: 1rem;
    background: var(--bg-white);
    transition: var(--transition);
}

.faq-question:hover {
    color: var(--accent);
}

.faq-question i {
    font-size: 0.85rem;
    color: var(--text-muted);
    transition: transform 0.3s ease;
    flex-shrink: 0;
}

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

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
}

.faq-answer-inner {
    padding: 0 1.5rem 1.25rem;
    color: var(--text-light);
    font-size: 0.9rem;
    line-height: 1.7;
}

/* ---------- Contact CTA Banner ---------- */
.contact-cta {
    background: linear-gradient(135deg, var(--primary-dark), var(--primary));
    text-align: center;
    padding: 4rem 0;
}

.contact-cta h2 {
    color: var(--text-white);
    margin-bottom: 1rem;
}

.contact-cta p {
    color: rgba(255, 255, 255, 0.7);
    max-width: 600px;
    margin: 0 auto 2rem;
    font-size: 1.05rem;
}

.contact-cta .btn-primary {
    font-size: 1rem;
    padding: 1rem 2.5rem;
}

/* ---------- Footer ---------- */
.footer {
    background-color: var(--primary-dark);
    color: rgba(255, 255, 255, 0.7);
    padding-top: 4rem;
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1.5fr;
    gap: 3rem;
    padding-bottom: 3rem;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-about {
    max-width: 300px;
}

.footer-logo img {
    height: 45px;
    margin-bottom: 1.25rem;
}

.footer-about p {
    font-size: 0.9rem;
    line-height: 1.7;
    margin-bottom: 1.5rem;
}

.footer-social {
    display: flex;
    gap: 0.75rem;
}

.footer-social a {
    width: 38px;
    height: 38px;
    border-radius: 50%;
    border: 1px solid rgba(255, 255, 255, 0.2);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.9rem;
    color: rgba(255, 255, 255, 0.6);
    transition: var(--transition);
}

.footer-social a:hover {
    background: var(--accent);
    border-color: var(--accent);
    color: var(--primary-dark);
}

.footer h4 {
    color: var(--text-white);
    font-size: 1rem;
    margin-bottom: 1.5rem;
    font-weight: 600;
}

.footer-links li {
    margin-bottom: 0.65rem;
}

.footer-links a {
    font-size: 0.9rem;
    color: rgba(255, 255, 255, 0.6);
    transition: var(--transition);
}

.footer-links a:hover {
    color: var(--accent);
    padding-left: 5px;
}

.footer-contact li {
    display: flex;
    align-items: flex-start;
    gap: 0.75rem;
    margin-bottom: 1rem;
    font-size: 0.9rem;
}

.footer-contact i {
    color: var(--accent);
    margin-top: 0.2rem;
    width: 18px;
    flex-shrink: 0;
}

.footer-bottom {
    padding: 1.5rem 0;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.8rem;
    color: rgba(255, 255, 255, 0.4);
}

/* ---------- WhatsApp Float Button ---------- */
.whatsapp-float {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    z-index: 999;
    width: 56px;
    height: 56px;
    background-color: #25D366;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1.7rem;
    box-shadow: 0 4px 12px rgba(37, 211, 102, 0.4);
    transition: var(--transition);
    cursor: pointer;
}

.whatsapp-float:hover {
    transform: scale(1.1);
    box-shadow: 0 6px 20px rgba(37, 211, 102, 0.5);
    color: white;
}

.whatsapp-float .tooltip {
    position: absolute;
    right: 70px;
    background: var(--bg-white);
    color: var(--text-dark);
    padding: 0.5rem 1rem;
    border-radius: var(--radius);
    font-size: 0.8rem;
    font-weight: 500;
    white-space: nowrap;
    box-shadow: var(--shadow-md);
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
}

.whatsapp-float:hover .tooltip {
    opacity: 1;
    visibility: visible;
}

/* ---------- Page Header (Inner Pages) ---------- */
.page-header {
    background: linear-gradient(135deg, var(--primary-dark), var(--primary));
    padding: 6rem 0 3rem;
    margin-top: var(--header-height);
    text-align: center;
}

.page-header h1 {
    color: var(--text-white);
    font-size: 2.5rem;
    margin-bottom: 0.75rem;
}

.breadcrumb {
    display: flex;
    justify-content: center;
    gap: 0.5rem;
    font-size: 0.9rem;
    color: rgba(255, 255, 255, 0.6);
}

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

.breadcrumb a:hover {
    color: var(--accent-light);
}

/* ---------- About Page ---------- */
.about-full {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
}

.about-full-text h2 {
    margin-bottom: 1.5rem;
}

.about-full-text p {
    color: var(--text-light);
    line-height: 1.8;
    margin-bottom: 1rem;
}

.mission-vision {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
    margin-top: 3rem;
}

.mv-card {
    background: var(--bg-white);
    border-radius: var(--radius-md);
    padding: 2rem;
    border: 1px solid var(--border-color);
    text-align: center;
}

.mv-card i {
    font-size: 2rem;
    color: var(--accent);
    margin-bottom: 1rem;
}

.mv-card h3 {
    margin-bottom: 0.75rem;
}

.mv-card p {
    font-size: 0.9rem;
    color: var(--text-light);
    line-height: 1.7;
}

/* Team Grid */
.team-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 2rem;
}

.team-card {
    background: var(--bg-white);
    border-radius: var(--radius-md);
    overflow: hidden;
    border: 1px solid var(--border-color);
    text-align: center;
    transition: var(--transition);
}

.team-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.team-photo {
    width: 100%;
    height: 280px;
    object-fit: cover;
    background-color: var(--bg-section);
}

.team-info {
    padding: 1.5rem;
}

.team-info h3 {
    font-size: 1.1rem;
    margin-bottom: 0.3rem;
}

.team-info p {
    color: var(--accent);
    font-size: 0.85rem;
    font-weight: 500;
}

/* ---------- Contact Page ---------- */
.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
}

.contact-info-cards {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.contact-info-card {
    background: var(--bg-white);
    border-radius: var(--radius-md);
    padding: 1.5rem;
    border: 1px solid var(--border-color);
    display: flex;
    align-items: flex-start;
    gap: 1rem;
}

.contact-info-card i {
    width: 44px;
    height: 44px;
    background: rgba(245, 158, 11, 0.1);
    border-radius: var(--radius);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--accent);
    font-size: 1.1rem;
    flex-shrink: 0;
}

.contact-info-card h4 {
    font-size: 0.9rem;
    margin-bottom: 0.3rem;
}

.contact-info-card p {
    font-size: 0.85rem;
    color: var(--text-light);
    margin: 0;
}

/* Contact Form */
.contact-form {
    background: var(--bg-white);
    border-radius: var(--radius-lg);
    padding: 2.5rem;
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--border-color);
}

.contact-form h3 {
    margin-bottom: 1.5rem;
}

.form-group {
    margin-bottom: 1.25rem;
}

.form-group label {
    display: block;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-dark);
    margin-bottom: 0.5rem;
}

.form-control {
    width: 100%;
    padding: 0.75rem 1rem;
    border: 1.5px solid var(--border-color);
    border-radius: var(--radius);
    font-size: 0.9rem;
    color: var(--text-dark);
    background: var(--bg-white);
    transition: var(--transition);
}

.form-control:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(245, 158, 11, 0.15);
}

.form-control::placeholder {
    color: var(--text-muted);
}

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

select.form-control {
    appearance: none;
    -webkit-appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' fill='%2364748b' viewBox='0 0 16 16'%3E%3Cpath d='M7.247 11.14 2.451 5.658C1.885 5.013 2.345 4 3.204 4h9.592a1 1 0 0 1 .753 1.659l-4.796 5.48a1 1 0 0 1-1.506 0z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 1rem center;
    padding-right: 2.5rem;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
}

.map-container {
    margin-top: 3rem;
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-lg);
}

.map-container iframe {
    width: 100%;
    height: 400px;
    border: none;
}

/* Alert Messages */
.alert {
    padding: 1rem 1.5rem;
    border-radius: var(--radius);
    margin-bottom: 1.5rem;
    font-size: 0.9rem;
    font-weight: 500;
}

.alert-success {
    background: rgba(16, 185, 129, 0.1);
    color: #065f46;
    border: 1px solid rgba(16, 185, 129, 0.2);
}

.alert-error {
    background: rgba(239, 68, 68, 0.1);
    color: #991b1b;
    border: 1px solid rgba(239, 68, 68, 0.2);
}

/* ---------- Blog Page ---------- */
.blog-single-header {
    text-align: center;
    max-width: 800px;
    margin: 0 auto 3rem;
}

.blog-single-header h1 {
    font-size: 2.2rem;
    margin-bottom: 1rem;
}

.blog-single-image {
    width: 100%;
    max-height: 500px;
    object-fit: cover;
    border-radius: var(--radius-lg);
    margin-bottom: 2rem;
}

.blog-single-content {
    max-width: 800px;
    margin: 0 auto;
    font-size: 1.05rem;
    line-height: 1.9;
    color: var(--text-body);
}

.blog-single-content h2 {
    margin-top: 2rem;
    margin-bottom: 1rem;
    font-size: 1.6rem;
}

.blog-single-content h3 {
    margin-top: 1.5rem;
    margin-bottom: 0.75rem;
}

.blog-single-content p {
    margin-bottom: 1.25rem;
}

.blog-single-content ul, .blog-single-content ol {
    margin-bottom: 1.25rem;
    padding-left: 1.5rem;
    list-style: disc;
}

.blog-single-content li {
    margin-bottom: 0.5rem;
}

/* ---------- Animations ---------- */
.fade-in {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

.fade-in-left {
    opacity: 0;
    transform: translateX(-30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in-left.visible {
    opacity: 1;
    transform: translateX(0);
}

.fade-in-right {
    opacity: 0;
    transform: translateX(30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in-right.visible {
    opacity: 1;
    transform: translateX(0);
}

/* ---------- Responsive ---------- */
@media (max-width: 1024px) {
    .hero-content {
        grid-template-columns: 1fr;
    }

    .calculator-card {
        max-width: 100%;
    }

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

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

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

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

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

    .about-full {
        grid-template-columns: 1fr;
    }

    .about-preview {
        grid-template-columns: 1fr;
    }

    .review-card {
        min-width: calc(50% - 1rem);
    }
}

@media (max-width: 768px) {
    :root {
        --header-height: 70px;
    }

    h1 { font-size: 2rem; }
    h2, .section-title { font-size: 1.75rem; }
    h3 { font-size: 1.25rem; }

    .section {
        padding: 3.5rem 0;
    }

    /* Mobile Nav */
    .menu-toggle {
        display: flex;
    }

    .header-nav {
        position: fixed;
        top: 0;
        right: -100%;
        width: 80%;
        max-width: 320px;
        height: 100vh;
        background: var(--bg-white);
        flex-direction: column;
        align-items: flex-start;
        padding: 5rem 2rem 2rem;
        box-shadow: -5px 0 20px rgba(0, 0, 0, 0.15);
        transition: right 0.3s ease;
        z-index: 1000;
        overflow-y: auto;
    }

    .header-nav.open {
        right: 0;
    }

    .nav-links {
        flex-direction: column;
        width: 100%;
        gap: 0;
    }

    .nav-links a {
        width: 100%;
        padding: 0.8rem 0;
        border-bottom: 1px solid var(--border-light);
        border-radius: 0;
        font-size: 1rem;
    }

    .header-actions {
        flex-direction: column;
        width: 100%;
        margin-top: 1.5rem;
    }

    .header-phone {
        width: 100%;
        justify-content: center;
    }

    .header-cta {
        width: 100%;
    }

    /* Mobile Overlay */
    .mobile-overlay {
        display: none;
        position: fixed;
        inset: 0;
        background: rgba(0, 0, 0, 0.5);
        z-index: 999;
    }

    .mobile-overlay.show {
        display: block;
    }

    /* Hero Mobile */
    .hero {
        min-height: auto;
        padding: 2rem 0;
    }

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

    .hero-stats {
        gap: 1.5rem;
        flex-wrap: wrap;
    }

    .hero-stat-value {
        font-size: 1.5rem;
    }

    .hero-buttons {
        flex-direction: column;
    }

    .hero-buttons .btn {
        width: 100%;
    }

    /* Stats */
    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .stat-item:nth-child(2)::after {
        display: none;
    }

    .stat-value {
        font-size: 1.8rem;
    }

    /* Grids */
    .services-grid,
    .products-grid,
    .projects-grid,
    .blog-grid {
        grid-template-columns: 1fr;
    }

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

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

    .form-row {
        grid-template-columns: 1fr;
    }

    .footer-grid {
        grid-template-columns: 1fr;
        gap: 2rem;
    }

    .footer-bottom {
        flex-direction: column;
        gap: 0.75rem;
        text-align: center;
    }

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

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

    .review-card {
        min-width: 100%;
    }

    .mission-vision {
        grid-template-columns: 1fr;
    }

    .page-header {
        padding: 4rem 0 2rem;
    }

    .page-header h1 {
        font-size: 1.8rem;
    }

    .calculator-card {
        padding: 1.5rem;
    }

    .calc-results {
        grid-template-columns: 1fr;
    }

    .whatsapp-float {
        bottom: 1.5rem;
        right: 1.5rem;
        width: 50px;
        height: 50px;
        font-size: 1.5rem;
    }

    .whatsapp-float .tooltip {
        display: none;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 1rem;
    }

    .hero-title {
        font-size: 1.7rem;
    }

    .section-title {
        font-size: 1.5rem;
    }

    .system-tabs {
        flex-direction: column;
    }

    .hero-stats {
        display: grid;
        grid-template-columns: 1fr 1fr;
        gap: 1rem;
    }
}

/* ---------- Product Filter ---------- */
.filter-tabs {
    display: flex;
    justify-content: center;
    gap: 0.75rem;
    margin-bottom: 2.5rem;
    flex-wrap: wrap;
}

.filter-tab {
    padding: 0.5rem 1.5rem;
    font-size: 0.85rem;
    font-weight: 600;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-full);
    background: transparent;
    color: var(--text-body);
    cursor: pointer;
    transition: var(--transition);
}

.filter-tab:hover,
.filter-tab.active {
    background: var(--primary-dark);
    border-color: var(--primary-dark);
    color: var(--text-white);
}

/* ---------- Blog Single Page ---------- */
.blog-share {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-top: 3rem;
    padding-top: 2rem;
    border-top: 1px solid var(--border-color);
}

.blog-share span {
    font-weight: 600;
    color: var(--text-dark);
}

.blog-share a {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: var(--bg-section);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-body);
    transition: var(--transition);
}

.blog-share a:hover {
    background: var(--accent);
    color: var(--text-white);
}

/* ---------- Lightbox ---------- */
.lightbox {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.9);
    z-index: 2000;
    align-items: center;
    justify-content: center;
    padding: 2rem;
}

.lightbox.active {
    display: flex;
}

.lightbox img {
    max-width: 90%;
    max-height: 85vh;
    object-fit: contain;
    border-radius: var(--radius);
}

.lightbox-close {
    position: absolute;
    top: 1.5rem;
    right: 1.5rem;
    width: 44px;
    height: 44px;
    border-radius: 50%;
    border: none;
    background: rgba(255, 255, 255, 0.2);
    color: white;
    font-size: 1.2rem;
    cursor: pointer;
    transition: var(--transition);
}

.lightbox-close:hover {
    background: rgba(255, 255, 255, 0.3);
}

/* ---------- Products Page Full ---------- */
.products-page-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
}

@media (max-width: 1024px) {
    .products-page-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .products-page-grid {
        grid-template-columns: 1fr;
    }
}