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

:root {
    --blue-50: #EFF6FF;
    --blue-100: #DBEAFE;
    --blue-500: #3B82F6;
    --blue-600: #2563EB;
    --blue-700: #1D4ED8;
    --blue-900: #1E3A5F;
    --gray-50: #F9FAFB;
    --gray-100: #F3F4F6;
    --gray-200: #E5E7EB;
    --gray-300: #D1D5DB;
    --gray-400: #9CA3AF;
    --gray-500: #6B7280;
    --gray-600: #4B5563;
    --gray-700: #374151;
    --gray-800: #1F2937;
    --gray-900: #111827;
    --green-500: #10B981;
    --red-500: #EF4444;
    --orange-500: #F59E0B;
    --purple-500: #8B5CF6;
    --teal-500: #14B8A6;
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
    --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.1), 0 2px 4px -2px rgba(0,0,0,0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.1), 0 4px 6px -4px rgba(0,0,0,0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0,0,0,0.1), 0 8px 10px -6px rgba(0,0,0,0.1);
}

/* ===== THEME VARIABLES ===== */
:root {
    --page-bg: #ffffff;
    --surface: #f9fafb;
    --surface-2: #f3f4f6;
    --border-color: var(--gray-200);
    --text-primary: var(--gray-900);
    --text-secondary: var(--gray-600);
    --text-muted: #595f6b;
    --card-bg: var(--gray-50);
    --navbar-bg: rgba(255,255,255,0.85);
    --input-bg: #ffffff;
    --input-border: var(--gray-200);
    --hero-gradient: linear-gradient(135deg, #f8faff 0%, #eff6ff 50%, #f0fdf4 100%);
    --section-alt: #f8faff;
}

[data-theme="dark"] {
    --page-bg: #09090b;
    --surface: #18181b;
    --surface-2: #27272a;
    --border-color: rgba(255,255,255,0.08);
    --text-primary: #f8fafc;
    --text-secondary: #a1a1aa;
    --text-muted: #71717a;
    --card-bg: #141416;
    --navbar-bg: rgba(9, 9, 11, 0.75);
    --input-bg: #09090b;
    --input-border: rgba(255,255,255,0.15);
    --hero-gradient: radial-gradient(circle at 60% 0%, #172554 0%, #09090b 70%);
    --section-alt: #0a0a0c;
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    color: var(--text-primary);
    background: var(--page-bg);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    transition: background 0.3s, color 0.3s;
}


.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

img { max-width: 100%; }
a { text-decoration: none; color: inherit; }
ul { list-style: none; }

/* ===== NAVBAR ===== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: var(--navbar-bg);
    backdrop-filter: blur(24px) saturate(180%);
    -webkit-backdrop-filter: blur(24px) saturate(180%);
    border-bottom: 1px solid var(--border-color);
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

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

.nav-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 64px;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 700;
    font-size: 1.25rem;
    line-height: 1;
    color: var(--text-primary);
    text-decoration: none;
}

.nav-logo picture, .nav-logo img {
    display: block;
    flex-shrink: 0;
}

.logo-icon {
    width: 36px;
    height: 36px;
    flex-shrink: 0;
    object-fit: contain;
}

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

.nav-links a {
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--text-secondary);
    transition: color 0.2s;
}

.nav-links a:hover {
    color: var(--blue-600);
}

.nav-links a.nav-active:not(.nav-cta) {
    color: #fff;
    background: var(--blue-600);
    border: 1.5px solid var(--blue-600);
    padding: 6px 14px;
    border-radius: 8px;
}

.nav-cta {
    background: var(--blue-500);
    color: #fff !important;
    padding: 8px 20px;
    border-radius: 8px;
    transition: background 0.2s !important;
}

.nav-cta:hover {
    background: var(--blue-700) !important;
}

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 4px;
}

.nav-toggle span {
    width: 24px;
    height: 2px;
    background: var(--gray-700);
    border-radius: 2px;
    transition: all 0.3s;
}

/* ===== LANG TOGGLE ===== */
.lang-toggle-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    height: 40px;
    padding: 0 12px;
    border: 1px solid var(--border-color);
    border-radius: 20px;
    background: var(--card-bg);
    color: var(--text-secondary);
    cursor: pointer;
    font-size: 12px;
    font-weight: 700;
    letter-spacing: 0.5px;
    transition: all 0.2s;
    flex-shrink: 0;
    margin-left: 8px;
}
.lang-toggle-btn:hover {
    border-color: var(--blue-500);
    color: var(--blue-500);
}
.lang-toggle-btn.lang-en {
    background: var(--blue-500);
    border-color: var(--blue-500);
    color: #fff;
}

/* ===== FOOTER LINKS ===== */
.footer-links {
    display: flex;
    align-items: center;
    gap: 8px;
    flex-wrap: wrap;
    font-size: 0.8rem;
}
.footer-links a {
    color: var(--gray-400);
    text-decoration: none;
    transition: color 0.2s;
}
.footer-links a:hover {
    color: #fff;
}
.footer-sep {
    color: var(--gray-600);
}

/* ===== THEME TOGGLE ===== */
.theme-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border: 1px solid var(--border-color);
    border-radius: 50%;
    background: var(--card-bg);
    color: var(--text-secondary);
    cursor: pointer;
    transition: all 0.2s;
    flex-shrink: 0;
    margin-left: 12px;
}

.theme-toggle:hover {
    border-color: var(--blue-500);
    color: var(--blue-500);
    transform: rotate(20deg);
}

[data-theme="light"] .icon-moon,
[data-theme="dark"] .icon-sun {
    display: none;
}

[data-theme="dark"] .icon-moon,
[data-theme="light"] .icon-sun {
    display: block;
}

/* ===== BUTTONS ===== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 12px 28px;
    border-radius: var(--radius-md);
    font-weight: 600;
    font-size: 0.95rem;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    cursor: pointer;
    border: none;
    position: relative;
    overflow: hidden;
}

.btn-primary {
    background: linear-gradient(135deg, var(--blue-500), var(--blue-700));
    color: #fff;
    box-shadow: 0 4px 14px 0 rgba(59, 130, 246, 0.39);
}

.btn-primary:hover {
    background: linear-gradient(135deg, var(--blue-400), var(--blue-600));
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(59, 130, 246, 0.5);
}

.btn-secondary {
    background: var(--surface-2, var(--gray-100));
    color: var(--text-primary, var(--gray-700));
    border: 1px solid var(--border-color, var(--gray-200));
}

.btn-secondary:hover {
    background: var(--surface-2, var(--gray-200));
    transform: translateY(-2px);
    box-shadow: 0 6px 16px rgba(0,0,0,0.06);
}

.btn-large {
    padding: 16px 36px;
    font-size: 1.05rem;
    border-radius: var(--radius-md);
}

/* ===== HERO ===== */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding-top: 64px;
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    inset: 0;
    background: var(--hero-gradient, linear-gradient(135deg, var(--blue-50) 0%, #fff 50%, var(--blue-50) 100%));
    transition: background 0.3s;
}

.hero-grid {
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(rgba(59,130,246,0.05) 1px, transparent 1px),
        linear-gradient(90deg, rgba(59,130,246,0.05) 1px, transparent 1px);
    background-size: 60px 60px;
}

.hero-container {
    position: relative;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
    padding-top: 40px;
    padding-bottom: 40px;
}

.hero-badge {
    display: inline-block;
    background: var(--blue-100);
    color: var(--blue-700);
    padding: 6px 16px;
    border-radius: 100px;
    font-size: 0.85rem;
    font-weight: 600;
    margin-bottom: 24px;
    box-shadow: 0 0 16px rgba(59, 130, 246, 0.4);
    border: 1px solid rgba(59, 130, 246, 0.2);
    animation: pulseGlow 3s infinite;
}

@keyframes pulseGlow {
    0% { box-shadow: 0 0 0 0 rgba(59, 130, 246, 0.4); }
    70% { box-shadow: 0 0 0 10px rgba(59, 130, 246, 0); }
    100% { box-shadow: 0 0 0 0 rgba(59, 130, 246, 0); }
}

.hero h1 {
    font-size: 3.5rem;
    font-weight: 800;
    line-height: 1.1;
    color: var(--text-primary);
    margin-bottom: 20px;
    letter-spacing: -0.02em;
}

.gradient-text {
    background: linear-gradient(135deg, var(--blue-500), var(--blue-700));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 1.15rem;
    color: var(--text-secondary);
    margin-bottom: 32px;
    max-width: 500px;
    line-height: 1.7;
}

.hero-actions {
    display: flex;
    gap: 16px;
    margin-bottom: 48px;
}

.hero-stats {
    display: flex;
    gap: 40px;
}

.stat {
    display: flex;
    flex-direction: column;
}

.stat-number {
    font-size: 1.75rem;
    font-weight: 800;
    color: var(--blue-600);
}

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

/* Phone mockup */
.hero-visual {
    display: flex;
    justify-content: center;
}

.phone-mockup {
    position: relative;
}

@keyframes float {
    0% { transform: translateY(0px) rotate(0deg); }
    50% { transform: translateY(-15px) rotate(0.5deg); }
    100% { transform: translateY(0px) rotate(0deg); }
}

.phone-frame {
    width: 280px;
    height: 560px;
    background: var(--gray-900);
    border-radius: 40px;
    padding: 12px;
    box-shadow: 0 25px 50px -12px rgba(0,0,0,0.4), 0 0 0 2px var(--gray-300);
    animation: float 6s ease-in-out infinite;
}

.phone-screen {
    width: 100%;
    height: 100%;
    border-radius: 30px;
    overflow: hidden;
    background: var(--surface-2);
    box-shadow: inset 0 0 12px rgba(0,0,0,0.1);
}

.mock-screenshot {
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: top;
    border-radius: 30px;
    transition: transform 0.5s ease;
}

.mock-map {
    width: 100%;
    height: 100%;
    position: relative;
}

.mock-map-bg {
    position: absolute;
    inset: 0;
    background:
        linear-gradient(135deg, #d4e6d4 25%, #c8ddc8 25%, #c8ddc8 50%, #d4e6d4 50%, #d4e6d4 75%, #c8ddc8 75%);
    background-size: 40px 40px;
    opacity: 0.7;
}

.mock-map-bg::after {
    content: '';
    position: absolute;
    inset: 0;
    background:
        linear-gradient(90deg, transparent 48%, rgba(180,180,180,0.4) 48%, rgba(180,180,180,0.4) 52%, transparent 52%),
        linear-gradient(0deg, transparent 48%, rgba(180,180,180,0.4) 48%, rgba(180,180,180,0.4) 52%, transparent 52%);
    background-size: 80px 80px;
}

.mock-markers {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
}

/* ===== SECTIONS COMMON ===== */
.section-header {
    text-align: center;
    max-width: 640px;
    margin: 0 auto 60px;
}

.section-tag {
    display: inline-block;
    background: var(--blue-100);
    color: var(--blue-700);
    padding: 4px 14px;
    border-radius: 100px;
    font-size: 0.8rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 16px;
}

.section-header h2 {
    font-size: 2.25rem;
    font-weight: 800;
    color: var(--text-primary);
    margin-bottom: 16px;
    letter-spacing: -0.02em;
}

.section-header p {
    font-size: 1.1rem;
    color: var(--text-muted);
    line-height: 1.7;
}

/* ===== FEATURES ===== */
.features {
    padding: 100px 0;
    background: var(--page-bg);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.feature-card {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 32px;
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    overflow: hidden;
}

.feature-card::after {
    content: '';
    position: absolute;
    inset: 0;
    pointer-events: none;
    background: radial-gradient(circle at 100% 100%, rgba(59, 130, 246, 0.05), transparent 60%);
    opacity: 0;
    transition: opacity 0.4s;
}

.feature-card:hover {
    border-color: var(--blue-500);
    box-shadow: 0 20px 40px -10px rgba(59, 130, 246, 0.12);
    transform: translateY(-6px);
}

.feature-card:hover::after {
    opacity: 1;
}

.feature-large {
    grid-column: span 2;
    display: flex;
    flex-direction: column;
}

.feature-large .feature-list {
    grid-column: unset;
    margin-top: 12px;
}

.feature-icon {
    width: 48px;
    height: 48px;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 16px;
    flex-shrink: 0;
}

.feature-icon svg {
    width: 24px;
    height: 24px;
}

.icon-blue { background: var(--blue-100); color: var(--blue-600); }
.icon-blue svg { stroke: var(--blue-600); }
.icon-green { background: #D1FAE5; color: var(--green-500); }
.icon-green svg { stroke: var(--green-500); }
.icon-purple { background: #EDE9FE; color: var(--purple-500); }
.icon-purple svg { stroke: var(--purple-500); }
.icon-orange { background: #FEF3C7; color: var(--orange-500); }
.icon-orange svg { stroke: var(--orange-500); }
.icon-red { background: #FEE2E2; color: var(--red-500); }
.icon-red svg { stroke: var(--red-500); }
.icon-teal { background: #CCFBF1; color: var(--teal-500); }
.icon-teal svg { stroke: var(--teal-500); }

.feature-card h3 {
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 8px;
}

.feature-card p {
    font-size: 0.95rem;
    color: var(--text-muted);
    line-height: 1.6;
}

.feature-list {
    margin-top: 12px;
}

.feature-list li {
    padding: 4px 0;
    font-size: 0.9rem;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    gap: 8px;
}

.feature-list li::before {
    content: '';
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--blue-500);
    flex-shrink: 0;
}

/* ===== HOW IT WORKS ===== */
.how-it-works {
    padding: 100px 0;
    background: var(--surface);
}

.steps {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 32px;
}

.step {
    position: relative;
}

.step::after {
    content: '';
    position: absolute;
    top: 36px;
    right: -16px;
    width: 32px;
    height: 2px;
    background: var(--gray-300);
}

.step:last-child::after {
    display: none;
}

.step-number {
    font-size: 3rem;
    font-weight: 900;
    color: var(--blue-100);
    line-height: 1;
    margin-bottom: 16px;
    text-shadow: 0 4px 12px rgba(59, 130, 246, 0.2);
    transition: transform 0.3s ease;
}

.step:hover .step-number {
    transform: scale(1.1) rotate(-5deg);
    color: var(--blue-500);
}

.step-content h3 {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 8px;
}

.step-content p {
    font-size: 0.9rem;
    color: var(--text-muted);
    line-height: 1.6;
}

/* ===== INFRASTRUCTURE ===== */
.infrastructure {
    padding: 100px 0;
    background: var(--page-bg);
}

.infra-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.infra-card {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 32px;
    text-align: center;
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    overflow: hidden;
}

.infra-card:hover {
    transform: translateY(-6px);
    box-shadow: 0 20px 40px -10px rgba(0, 0, 0, 0.1);
    border-color: var(--accent, var(--blue-500));
}

.infra-icon {
    width: 72px;
    height: 72px;
    margin: 0 auto 20px;
}

.infra-icon svg {
    width: 100%;
    height: 100%;
}

.infra-card h3 {
    font-size: 1.05rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 8px;
}

.infra-card p {
    font-size: 0.9rem;
    color: var(--text-muted);
    margin-bottom: 12px;
}

.infra-code {
    display: inline-block;
    background: var(--surface-2, var(--gray-200));
    color: var(--text-secondary);
    padding: 4px 12px;
    border-radius: 6px;
    font-size: 0.8rem;
    font-weight: 600;
    font-family: 'SF Mono', 'Fira Code', monospace;
}

/* ===== DXF EXPORT ===== */
.export-section {
    padding: 100px 0;
    background: var(--gray-900);
    color: #fff;
}

.export-layout {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.export-content .section-tag {
    background: rgba(59,130,246,0.25);
    color: #93C5FD;
}

.export-content h2 {
    font-size: 2.25rem;
    font-weight: 800;
    margin-bottom: 16px;
}

.export-content > p {
    color: var(--gray-400);
    font-size: 1.05rem;
    line-height: 1.7;
    margin-bottom: 32px;
}

.export-features {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.export-feature {
    display: flex;
    gap: 16px;
    align-items: flex-start;
}

.export-feature svg {
    width: 24px;
    height: 24px;
    flex-shrink: 0;
    margin-top: 2px;
}

.export-feature strong {
    display: block;
    color: #fff;
    margin-bottom: 4px;
}

.export-feature p {
    font-size: 0.9rem;
    color: var(--gray-400);
}

/* DXF Preview */
.dxf-preview {
    background: var(--gray-800);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-xl);
    border: 1px solid rgba(255,255,255,0.1);
}

.dxf-header {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 14px 20px;
    background: rgba(255,255,255,0.05);
    border-bottom: 1px solid rgba(255,255,255,0.1);
}

.dxf-dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
}

.dxf-dot.red { background: #EF4444; }
.dxf-dot.yellow { background: #F59E0B; }
.dxf-dot.green { background: #10B981; }

.dxf-title {
    margin-left: auto;
    font-size: 0.85rem;
    color: var(--gray-400);
    font-family: 'SF Mono', 'Fira Code', monospace;
}

.dxf-content {
    padding: 20px;
}

.dxf-layer {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 8px 12px;
    border-radius: 6px;
    font-size: 0.85rem;
    color: var(--gray-300);
    font-family: 'SF Mono', 'Fira Code', monospace;
    transition: background 0.2s;
}

.dxf-layer:hover {
    background: rgba(255,255,255,0.05);
}

.layer-color {
    width: 10px;
    height: 10px;
    border-radius: 3px;
    flex-shrink: 0;
}

/* ===== PROJECT MANAGEMENT ===== */
.project-mgmt {
    padding: 100px 0;
    background: var(--card-bg);
}

.project-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.project-card {
    background: var(--page-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 32px;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.project-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 12px 24px -8px rgba(0,0,0,0.1);
    border-color: var(--blue-300);
}

.project-card h3 {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 16px;
    padding-bottom: 12px;
    border-bottom: 2px solid var(--blue-500);
}

.project-card ul li {
    padding: 6px 0;
    font-size: 0.9rem;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    gap: 8px;
}

.project-card ul li::before {
    content: '';
    width: 5px;
    height: 5px;
    border-radius: 50%;
    background: var(--blue-500);
    flex-shrink: 0;
}

/* ===== DRAWING TOOLS ===== */
.drawing-tools {
    padding: 100px 0;
    background: var(--page-bg);
}

.drawing-layout {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.drawing-content .section-tag {
    margin-bottom: 16px;
}

.drawing-content h2 {
    font-size: 2.25rem;
    font-weight: 800;
    color: var(--text-primary);
    margin-bottom: 16px;
}

.drawing-content > p {
    color: var(--text-muted);
    font-size: 1.05rem;
    margin-bottom: 32px;
}

.drawing-modes {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.mode {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 24px;
}

.mode-header {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 8px;
}

.mode h4 {
    font-size: 1rem;
    font-weight: 700;
    color: var(--text-primary);
}

.mode p {
    font-size: 0.9rem;
    color: var(--text-muted);
}

.tool-cards {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
}

.tool-card {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 24px;
    text-align: center;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.tool-card:hover {
    border-color: var(--blue-500);
    transform: translateY(-4px) scale(1.02);
    box-shadow: 0 12px 24px -8px rgba(59, 130, 246, 0.2);
}

.tool-card svg {
    width: 32px;
    height: 32px;
    color: var(--blue-500);
    margin-bottom: 12px;
    transition: transform 0.3s;
}

.tool-card:hover svg {
    transform: scale(1.1);
}

.tool-card span {
    display: block;
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--gray-700);
}

/* ===== TECH STACK ===== */
.tech-stack {
    padding: 100px 0;
    background: var(--card-bg);
}

.tech-grid {
    display: grid;
    grid-template-columns: repeat(6, 1fr);
    gap: 24px;
}

.tech-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
    padding: 24px;
    background: var(--page-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    transition: all 0.3s;
}

.tech-item:hover {
    transform: translateY(-6px);
    box-shadow: 0 12px 24px -8px rgba(0,0,0,0.1);
    border-color: var(--blue-500);
}

.tech-item:hover .tech-logo {
    background: var(--blue-500);
    color: white;
    transform: scale(1.1) rotate(5deg);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.tech-logo {
    width: 56px;
    height: 56px;
    border-radius: var(--radius-md);
    background: var(--blue-100);
    color: var(--blue-700);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 800;
    font-size: 1.1rem;
    transition: all 0.3s;
}

.tech-item span {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--gray-700);
}

/* ===== PLATFORMS ===== */
.platforms {
    padding: 80px 0;
    background: var(--page-bg);
}

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

.platforms-content h2 {
    font-size: 2.25rem;
    font-weight: 800;
    color: var(--text-primary);
    margin-bottom: 12px;
}

.platforms-content > p {
    color: var(--text-muted);
    font-size: 1.05rem;
    margin-bottom: 40px;
}

.platform-badges {
    display: flex;
    justify-content: center;
    gap: 24px;
}

.platform-badge {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 20px 32px;
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    transition: all 0.3s;
}

.platform-badge:hover {
    border-color: var(--blue-500);
    box-shadow: var(--shadow-md);
}

.platform-badge svg {
    color: var(--blue-600);
}

.platform-badge strong {
    display: block;
    font-size: 1rem;
    color: var(--text-primary);
}

.platform-badge span {
    font-size: 0.85rem;
    color: var(--text-muted);
}

.platform-soon-badge,
.platform-badge .platform-soon-badge {
    margin-left: auto;
    flex-shrink: 0;
    background: #2563EB;
    color: #fff !important;
    font-size: 0.72rem;
    font-weight: 700;
    letter-spacing: 0.04em;
    padding: 3px 10px;
    border-radius: 20px;
}

.platform-badge-soon {
    opacity: 0.85;
}

.platform-check {
    margin-left: auto;
    flex-shrink: 0;
}

/* ===== CTA ===== */
.cta-section {
    padding: 100px 0;
    background: linear-gradient(135deg, var(--blue-600), var(--blue-700));
}

.cta-content {
    text-align: center;
    max-width: 600px;
    margin: 0 auto;
}

.cta-content h2 {
    font-size: 2.25rem;
    font-weight: 800;
    color: #fff;
    margin-bottom: 16px;
}

.cta-content p {
    color: rgba(255,255,255,0.8);
    font-size: 1.1rem;
    margin-bottom: 32px;
    line-height: 1.7;
}

.cta-actions .btn-primary {
    background: var(--page-bg);
    color: var(--blue-700);
}

.cta-actions .btn-primary:hover {
    background: var(--blue-50);
    box-shadow: 0 4px 12px rgba(0,0,0,0.2);
}

/* ===== FOOTER ===== */
.footer {
    padding: 32px 0;
    background: var(--gray-900);
    border-top: 1px solid rgba(255,255,255,0.1);
}

.footer-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 16px;
}

.footer-brand {
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 700;
    font-size: 1.1rem;
    line-height: 1;
    color: #fff;
}

.footer-brand picture, .footer-brand img {
    display: block;
    flex-shrink: 0;
}

.footer-brand .logo-icon {
    width: 32px;
    height: 32px;
}

.footer-text {
    font-size: 0.85rem;
    color: var(--gray-400);
    margin: 0;
    line-height: 1;
}

/* ===== GEODESY TOOLS ===== */
.geodesy-tools {
    padding: 100px 0;
    background: var(--card-bg);
}

.tools-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
}

.tool-feature-card {
    position: relative;
    background: var(--page-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 32px;
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    overflow: hidden;
}

.tool-feature-card::after {
    content: '';
    position: absolute;
    inset: 0;
    pointer-events: none;
    background: radial-gradient(circle at 100% 0%, rgba(59, 130, 246, 0.08), transparent 60%);
    opacity: 0;
    transition: opacity 0.4s;
}

.tool-feature-card:hover {
    border-color: var(--blue-200, #BFDBFE);
    box-shadow: 0 20px 40px -10px rgba(59, 130, 246, 0.15);
    transform: translateY(-6px);
}

.tool-feature-card:hover::after {
    opacity: 1;
}

.tool-featured {
    grid-column: 1 / -1;
    background: linear-gradient(135deg, var(--surface) 0%, var(--surface-2) 100%);
    border-color: var(--blue-200, #BFDBFE);
}

.tool-featured-badge {
    position: absolute;
    top: 16px;
    right: 16px;
    background: var(--blue-500);
    color: #fff;
    padding: 4px 12px;
    border-radius: 100px;
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.tool-feature-icon {
    width: 48px;
    height: 48px;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 16px;
}

.tool-feature-icon svg {
    width: 24px;
    height: 24px;
}

.tool-feature-card h3 {
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 8px;
}

.tool-feature-card p {
    font-size: 0.95rem;
    color: var(--text-muted);
    line-height: 1.6;
    margin-bottom: 16px;
}

.tool-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.tool-tag {
    display: inline-block;
    background: var(--surface-2, var(--gray-100));
    color: var(--text-secondary);
    padding: 4px 10px;
    border-radius: 6px;
    font-size: 0.8rem;
    font-weight: 600;
    font-family: 'SF Mono', 'Fira Code', monospace;
}

/* ===== DXF CONVERTER TOOL ===== */
.dxf-converter-section {
    padding: 100px 0;
    background: var(--surface);
}

.dxf-conv-tool {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 32px;
    max-width: 900px;
    margin: 0 auto;
}

.dxf-conv-left {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.dxf-upload-area {
    border: 2px dashed var(--border-color);
    border-radius: var(--radius-lg);
    padding: 40px 24px;
    text-align: center;
    cursor: pointer;
    transition: all 0.2s;
    background: var(--card-bg);
    color: var(--text-muted);
}

.dxf-upload-area:hover,
.dxf-upload-area.drag-over {
    border-color: var(--blue-500);
    background: rgba(59,130,246,0.05);
    color: var(--blue-500);
}

.dxf-upload-area.has-file {
    border-color: var(--green-500);
    background: rgba(16,185,129,0.05);
    color: var(--green-500);
}

.upload-title {
    font-weight: 600;
    margin-top: 12px;
    font-size: 0.95rem;
}

.upload-subtitle {
    font-size: 0.82rem;
    margin-top: 4px;
    color: var(--text-muted);
}

.dxf-option-label {
    display: block;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: 10px;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.dxf-conv-right {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 300px;
}

.dxf-result-placeholder {
    text-align: center;
    color: var(--gray-500);
}

.dxf-result-placeholder p {
    margin-top: 12px;
    font-size: 0.95rem;
}

.dxf-result-data {
    width: 100%;
}

.dxf-result-header {
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 700;
    font-size: 1rem;
    color: var(--green-500);
    margin-bottom: 20px;
    padding-bottom: 16px;
    border-bottom: 1px solid var(--border-color);
}

.dxf-stats {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    margin-bottom: 16px;
}

.dxf-stat-pill {
    background: var(--surface-2, var(--gray-100));
    border-radius: 20px;
    padding: 4px 14px;
    font-size: 0.82rem;
    font-weight: 600;
    color: var(--text-secondary);
}

.dxf-areas {
    max-height: 200px;
    overflow-y: auto;
    margin-bottom: 20px;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.dxf-area-row {
    background: var(--surface, var(--gray-50));
    border-radius: var(--radius-sm);
    padding: 10px 14px;
    font-size: 0.85rem;
}

.dxf-area-row strong {
    color: var(--text-primary);
    display: block;
    margin-bottom: 2px;
}

.dxf-area-row span {
    color: var(--text-muted);
}

/* DXF Converter Settings */
.dxf-setting-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 8px 0;
    border-bottom: 1px solid var(--border-color);
}

.dxf-setting-row:last-child {
    border-bottom: none;
    padding-bottom: 0;
}

.dxf-setting-label {
    font-size: 0.85rem;
    color: var(--text-secondary);
    font-weight: 500;
}

.color-input {
    width: 36px;
    height: 30px;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    cursor: pointer;
    background: none;
    padding: 2px;
}

.color-input::-webkit-color-swatch-wrapper { padding: 0; }
.color-input::-webkit-color-swatch { border: none; border-radius: 4px; }

/* Toggle Switch */
.toggle-switch {
    position: relative;
    display: inline-block;
    width: 44px;
    height: 24px;
}

.toggle-switch input {
    opacity: 0;
    width: 0;
    height: 0;
}

.toggle-slider {
    position: absolute;
    cursor: pointer;
    inset: 0;
    background: var(--gray-300);
    border-radius: 24px;
    transition: 0.3s;
}

.toggle-slider::before {
    content: '';
    position: absolute;
    width: 18px;
    height: 18px;
    left: 3px;
    bottom: 3px;
    background: white;
    border-radius: 50%;
    transition: 0.3s;
}

.toggle-switch input:checked + .toggle-slider {
    background: var(--blue-600);
}

.toggle-switch input:checked + .toggle-slider::before {
    transform: translateX(20px);
}

/* Layer Selection */
.dxf-layers-section {
    margin-bottom: 16px;
}

.dxf-layer-count {
    font-weight: 400;
    color: var(--text-muted);
    font-size: 0.8rem;
}

.dxf-layer-actions {
    display: flex;
    gap: 8px;
    margin-bottom: 8px;
}

.btn-small {
    padding: 4px 12px;
    font-size: 0.78rem;
    font-weight: 600;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    background: var(--card-bg);
    color: var(--text-secondary);
    cursor: pointer;
    transition: all 0.2s;
}

.btn-small:hover {
    border-color: var(--blue-500);
    color: var(--blue-500);
}

.dxf-layer-list {
    max-height: 160px;
    overflow-y: auto;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    background: var(--page-bg);
}

.dxf-layer-item {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 6px 10px;
    font-size: 0.82rem;
    color: var(--text-primary);
    cursor: pointer;
    border-bottom: 1px solid var(--border-color);
    transition: background 0.15s;
}

.dxf-layer-item:last-child {
    border-bottom: none;
}

.dxf-layer-item:hover {
    background: rgba(59,130,246,0.04);
}

.dxf-layer-item input[type="checkbox"] {
    accent-color: var(--blue-600);
    width: 16px;
    height: 16px;
    cursor: pointer;
}

.dxf-layer-item span {
    font-family: 'SF Mono', 'Fira Code', monospace;
    font-size: 0.8rem;
}

.dxf-width-tabs {
    flex: 1;
    max-width: 220px;
}

.dxf-entity-stats {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    margin-bottom: 12px;
}

.dxf-stat-entity {
    font-size: 0.75rem !important;
    padding: 2px 10px !important;
    background: rgba(59,130,246,0.08) !important;
    color: var(--blue-600) !important;
}

/* ===== TRANSFORM TOOL ===== */
.transform-section {
    padding: 100px 0;
    background: var(--page-bg);
}

.transform-tool {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 32px;
    max-width: 900px;
    margin: 0 auto;
}

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

.transform-input-group {
    margin-bottom: 24px;
}

.transform-label {
    display: block;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: 10px;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.transform-tabs {
    display: flex;
    gap: 6px;
    background: var(--surface-2, var(--gray-200));
    padding: 4px;
    border-radius: var(--radius-sm);
}

.transform-tab {
    flex: 1;
    padding: 8px 12px;
    border: none;
    background: transparent;
    border-radius: 6px;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all 0.2s;
}

.transform-tab.active {
    background: var(--page-bg);
    color: var(--blue-600);
    box-shadow: var(--shadow-sm);
}

.transform-tab:hover:not(.active) {
    color: var(--text-primary);
}

.transform-fields {
    display: flex;
    flex-direction: column;
    gap: 16px;
    margin-bottom: 24px;
}

.transform-field label {
    display: block;
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--text-muted);
    margin-bottom: 6px;
}

.transform-field input {
    width: 100%;
    padding: 12px 16px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    font-size: 1rem;
    font-family: 'SF Mono', 'Fira Code', monospace;
    color: var(--text-primary);
    background: var(--page-bg);
    transition: border-color 0.2s, box-shadow 0.2s;
    outline: none;
    box-sizing: border-box;
}

.transform-field input:focus {
    border-color: var(--blue-500);
    box-shadow: 0 0 0 3px rgba(59,130,246,0.1);
}

.transform-field input::placeholder {
    color: var(--gray-400);
}

.btn-transform {
    width: 100%;
    justify-content: center;
    padding: 14px 24px;
    font-size: 1rem;
}

.transform-result {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.result-placeholder {
    text-align: center;
    color: var(--gray-500);
}

.result-placeholder p {
    margin-top: 12px;
    font-size: 0.95rem;
}

.result-data {
    width: 100%;
}

.result-header {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 24px;
    font-weight: 700;
    font-size: 1rem;
    color: var(--text-primary);
}

.result-coords {
    display: flex;
    flex-direction: column;
    gap: 16px;
    margin-bottom: 24px;
}

.result-coord {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 14px 16px;
    background: var(--page-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
}

.result-coord-label {
    font-size: 0.85rem;
    color: var(--text-muted);
    font-weight: 500;
}

.result-coord-value {
    font-family: 'SF Mono', 'Fira Code', monospace;
    font-size: 1rem;
    font-weight: 700;
    color: var(--text-primary);
}

.btn-maps {
    width: 100%;
    justify-content: center;
    padding: 14px 24px;
    font-size: 0.95rem;
    margin-bottom: 10px;
    background: #34A853;
}

.btn-maps:hover {
    background: #2d9249;
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(52,168,83,0.4);
}

.btn-copy {
    width: 100%;
    justify-content: center;
    padding: 10px 20px;
    font-size: 0.85rem;
}

.transform-error {
    background: #FEE2E2;
    color: var(--red-500);
    padding: 12px 16px;
    border-radius: var(--radius-sm);
    font-size: 0.9rem;
    font-weight: 500;
    margin-top: 12px;
}

/* ===== BULK TRANSFORM TOOL ===== */
.bulk-transform-section {
    padding: 100px 0;
    background: var(--surface);
}

.bulk-tool {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 32px;
    max-width: 1000px;
    margin: 0 auto;
}

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

.bulk-textarea-wrap {
    margin-bottom: 24px;
    position: relative;
}

.bulk-textarea {
    width: 100%;
    padding: 12px 16px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    font-size: 0.9rem;
    font-family: 'SF Mono', 'Fira Code', monospace;
    color: var(--text-primary);
    background: var(--page-bg);
    transition: border-color 0.2s, box-shadow 0.2s;
    outline: none;
    resize: vertical;
    box-sizing: border-box;
    line-height: 1.6;
}

.bulk-textarea:focus {
    border-color: var(--blue-500);
    box-shadow: 0 0 0 3px rgba(59,130,246,0.1);
}

.bulk-textarea::placeholder {
    color: var(--gray-400);
}

.bulk-textarea-actions {
    display: flex;
    gap: 8px;
    margin-top: 8px;
}

.btn-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    background: var(--card-bg);
    color: var(--text-secondary);
    cursor: pointer;
    transition: all 0.2s;
}

.btn-icon:hover {
    border-color: var(--blue-500);
    color: var(--blue-500);
    background: rgba(59,130,246,0.05);
}

.bulk-result {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 400px;
}

.bulk-result-placeholder {
    text-align: center;
    color: var(--gray-500);
}

.bulk-result-placeholder p {
    margin-top: 12px;
    font-size: 0.95rem;
}

.bulk-result-data {
    width: 100%;
}

.bulk-result-table-wrap {
    max-height: 300px;
    overflow-y: auto;
    margin-bottom: 20px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
}

.bulk-result-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.82rem;
    font-family: 'SF Mono', 'Fira Code', monospace;
}

.bulk-result-table th {
    background: var(--surface-2);
    padding: 8px 10px;
    text-align: left;
    font-weight: 600;
    color: var(--text-secondary);
    font-size: 0.78rem;
    text-transform: uppercase;
    letter-spacing: 0.03em;
    position: sticky;
    top: 0;
    z-index: 1;
}

.bulk-result-table td {
    padding: 7px 10px;
    border-top: 1px solid var(--border-color);
    color: var(--text-primary);
}

.bulk-result-table tr:hover td {
    background: rgba(59,130,246,0.04);
}

.bulk-result-table td:first-child {
    color: var(--text-muted);
    font-weight: 600;
    width: 40px;
}

.bulk-export-actions {
    display: flex;
    gap: 12px;
}

.bulk-export-actions .btn {
    flex: 1;
    justify-content: center;
    padding: 12px 16px;
    font-size: 0.9rem;
}

/* ===== UPDATED PHONE MOCKUP ===== */
.mock-app {
    width: 100%;
    height: 100%;
    background: var(--surface-2);
    display: flex;
    flex-direction: column;
}

.mock-header {
    background: linear-gradient(135deg, #1565C0, #1976D2);
    padding: 16px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.mock-header span {
    color: white;
    font-weight: 700;
    font-size: 14px;
    font-family: 'Inter', sans-serif;
}

.mock-cards {
    padding: 12px;
    display: flex;
    flex-direction: column;
    gap: 10px;
    flex: 1;
}

.mock-card {
    background: var(--page-bg);
    border-radius: 12px;
    padding: 16px;
    display: flex;
    align-items: center;
    gap: 12px;
    box-shadow: 0 1px 3px rgba(0,0,0,0.08);
}

.mock-card-icon {
    width: 40px;
    height: 40px;
    border-radius: 10px;
    background: var(--accent, #3B82F6);
    opacity: 0.15;
    flex-shrink: 0;
    position: relative;
}

.mock-card-icon::after {
    content: '';
    position: absolute;
    inset: 10px;
    border-radius: 4px;
    background: var(--accent, #3B82F6);
    opacity: 1;
}

.mock-card-lines {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.mock-line {
    height: 8px;
    border-radius: 4px;
    background: var(--border-color);
}

.mock-line.short {
    height: 6px;
    background: var(--surface-2);
}

/* ===== CTA SOCIAL LINKS ===== */
.cta-social {
    display: flex;
    justify-content: center;
    gap: 16px;
    margin-top: 24px;
}

.cta-social-link {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    color: rgba(255,255,255,0.8) !important;
    font-size: 0.9rem;
    font-weight: 500;
    padding: 8px 16px;
    border-radius: 8px;
    border: 1px solid rgba(255,255,255,0.2);
    transition: all 0.2s;
}

.cta-social-link:hover {
    background: rgba(255,255,255,0.1);
    color: #fff !important;
    border-color: rgba(255,255,255,0.4);
}

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

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

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

/* ===== RESPONSIVE ===== */
@media (max-width: 1024px) {
    .hero h1 { font-size: 2.75rem; }
    .steps { grid-template-columns: repeat(2, 1fr); }
    .step::after { display: none; }
    .tech-grid { grid-template-columns: repeat(3, 1fr); }
}

@media (max-width: 768px) {
    .nav-toggle { display: flex; order: 4; margin-left: 16px; }
    .nav-logo { order: 1; }
    .lang-toggle-btn { order: 2; margin-left: auto; }
    .theme-toggle { order: 3; margin-left: 16px; }

    .nav-links {
        position: absolute;
        top: 64px;
        left: 0;
        right: 0;
        background: var(--page-bg);
        display: flex;
        flex-direction: column;
        padding: 28px 24px;
        gap: 20px;
        border-bottom: 1px solid var(--border-color);
        box-shadow: var(--shadow-lg);
        opacity: 0;
        visibility: hidden;
        transform: translateY(-15px);
        transition: opacity 0.3s cubic-bezier(0.4, 0, 0.2, 1), transform 0.3s cubic-bezier(0.4, 0, 0.2, 1), visibility 0.3s;
        z-index: 100;
        pointer-events: none;
    }

    .nav-links.active {
        opacity: 1;
        visibility: visible;
        transform: translateY(0);
        pointer-events: auto;
    }

    .hero-container {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .hero h1 { font-size: 2.25rem; }

    .hero-subtitle {
        margin-left: auto;
        margin-right: auto;
    }

    .hero-actions { justify-content: center; }
    .hero-stats { justify-content: center; }

    .phone-frame {
        width: 220px;
        height: 440px;
    }

    .tools-grid { grid-template-columns: 1fr; }
    .tool-featured { grid-column: 1; }
    .features-grid { grid-template-columns: 1fr; }

    .feature-large {
        grid-column: span 1;
    }

    .feature-large .feature-list {
        grid-column: 1;
    }

    .transform-tool { grid-template-columns: 1fr; }
    .bulk-tool { grid-template-columns: 1fr; }
    .dxf-conv-tool { grid-template-columns: 1fr; }
    .bulk-export-actions { flex-direction: column; }
    .infra-grid { grid-template-columns: 1fr 1fr; }
    .export-layout { grid-template-columns: 1fr; }
    .project-grid { grid-template-columns: 1fr; }
    .drawing-layout { grid-template-columns: 1fr; }
    .steps { grid-template-columns: 1fr; }
    .tech-grid { grid-template-columns: repeat(3, 1fr); }

    .platform-badges {
        flex-direction: column;
        align-items: center;
    }

    .footer-content {
        flex-direction: column;
        align-items: center;
        gap: 16px;
        text-align: center;
    }

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

    .section-header h2 { font-size: 1.75rem; }
    .export-content h2 { font-size: 1.75rem; }
    .drawing-content h2 { font-size: 1.75rem; }
    .cta-content h2 { font-size: 1.75rem; }
    .platforms-content h2 { font-size: 1.75rem; }
}

@media (max-width: 480px) {
    .hero h1 { font-size: 1.85rem; }
    .hero-stats { flex-direction: column; gap: 16px; }
    .hero-actions { flex-direction: column; }
    .btn { width: 100%; justify-content: center; }
    .infra-grid { grid-template-columns: 1fr; }
    .tech-grid { grid-template-columns: repeat(2, 1fr); }
    .tool-cards { grid-template-columns: 1fr; }
}

/* ===== FAQ SECTION ===== */
.faq-section {
    padding: 80px 0;
    background: var(--page-bg);
}

.faq-list {
    max-width: 780px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.faq-item {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    overflow: hidden;
    transition: border-color 0.2s;
}

.faq-item[open] {
    border-color: var(--blue-500);
}

.faq-item summary {
    padding: 20px 24px;
    font-weight: 600;
    font-size: 1rem;
    color: var(--text-primary);
    cursor: pointer;
    list-style: none;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 16px;
}

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

.faq-item summary::after {
    content: '+';
    font-size: 1.4rem;
    font-weight: 400;
    color: var(--blue-500);
    flex-shrink: 0;
    transition: transform 0.2s;
}

.faq-item[open] summary::after {
    transform: rotate(45deg);
}

.faq-item p {
    padding: 0 24px 20px;
    color: var(--text-secondary);
    line-height: 1.7;
    font-size: 0.95rem;
}

.content-section {
    padding: 80px 0;
    background: var(--surface);
}

.content-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 24px;
}

.content-card {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 28px;
    box-shadow: var(--shadow-sm);
}

.content-card h3 {
    font-size: 1.2rem;
    margin-bottom: 12px;
    color: var(--text-primary);
}

.content-card p {
    color: var(--text-secondary);
    margin-bottom: 16px;
    line-height: 1.7;
}

.content-list {
    display: flex;
    flex-direction: column;
    gap: 10px;
    color: var(--text-secondary);
}

.content-list li {
    position: relative;
    padding-left: 18px;
}

.content-list li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0.7em;
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--blue-500);
    transform: translateY(-50%);
}

.related-links {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 16px;
}

.related-link-card {
    display: block;
    padding: 20px;
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
    background: var(--card-bg);
    transition: transform 0.2s, border-color 0.2s, box-shadow 0.2s;
}

.related-link-card:hover {
    transform: translateY(-2px);
    border-color: rgba(37, 99, 235, 0.35);
    box-shadow: var(--shadow-md);
}

.related-link-card strong {
    display: block;
    margin-bottom: 8px;
    color: var(--text-primary);
}

.related-link-card span {
    color: var(--text-secondary);
    line-height: 1.6;
    font-size: 0.95rem;
}

@media (max-width: 768px) {
    .content-grid,
    .related-links {
        grid-template-columns: 1fr;
    }
}