/* ========================================
   WORDCRAFT — Professional Website Styles
   ======================================== */

/* --- CSS Variables / Design Tokens --- */
:root {
    --primary: #4F46E5;
    --primary-light: #818CF8;
    --primary-dark: #3730A3;
    --primary-50: #EEF2FF;
    --primary-100: #E0E7FF;
    --secondary: #EC4899;
    --secondary-light: #F472B6;
    --accent: #06B6D4;
    --accent-light: #22D3EE;

    --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;

    --white: #FFFFFF;
    --black: #000000;

    --success: #10B981;
    --warning: #F59E0B;
    --danger: #EF4444;

    --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);
    --shadow-2xl: 0 25px 50px -12px rgba(0,0,0,0.25);

    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --radius-full: 9999px;

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

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

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

html {
    scroll-behavior: smooth;
    scroll-padding-top: 80px;
}

body {
    font-family: var(--font-sans);
    color: var(--gray-800);
    line-height: 1.7;
    background: var(--white);
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

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

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

ul { list-style: none; }

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

.section {
    padding: 100px 0;
    position: relative;
}

/* --- Buttons --- */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 14px 32px;
    font-size: 1rem;
    font-weight: 600;
    border-radius: var(--radius-full);
    border: 2px solid transparent;
    cursor: pointer;
    transition: var(--transition);
    font-family: var(--font-sans);
    letter-spacing: -0.01em;
}

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

.btn-primary:hover {
    background: var(--primary-dark);
    border-color: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(79, 70, 229, 0.35);
}

.btn-outline {
    background: transparent;
    color: var(--white);
    border-color: rgba(255,255,255,0.4);
}

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

.btn-lg {
    padding: 16px 40px;
    font-size: 1.1rem;
}

/* --- Section Headers --- */
.section-header {
    text-align: center;
    max-width: 700px;
    margin: 0 auto 64px;
}

.section-tag {
    display: inline-block;
    padding: 6px 18px;
    background: var(--primary-50);
    color: var(--primary);
    font-size: 0.85rem;
    font-weight: 600;
    border-radius: var(--radius-full);
    text-transform: uppercase;
    letter-spacing: 0.08em;
    margin-bottom: 16px;
}

.section-title {
    font-family: var(--font-display);
    font-size: 2.8rem;
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: 16px;
    line-height: 1.2;
    letter-spacing: -0.02em;
}

.section-desc {
    font-size: 1.15rem;
    color: var(--gray-500);
    line-height: 1.8;
}

/* ================================================
   NAVIGATION
   ================================================ */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    padding: 16px 0;
    transition: var(--transition);
    background: transparent;
}

.navbar.scrolled {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    box-shadow: 0 1px 3px rgba(0,0,0,0.08);
    padding: 10px 0;
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 1.4rem;
    font-weight: 800;
    color: var(--white);
    letter-spacing: -0.02em;
}

.navbar.scrolled .nav-logo { color: var(--gray-900); }
.nav-logo i { font-size: 1.5rem; color: var(--primary-light); }
.navbar.scrolled .nav-logo i { color: var(--primary); }

.nav-menu {
    display: flex;
    align-items: center;
    gap: 4px;
}

.nav-link {
    padding: 8px 14px;
    font-size: 0.88rem;
    font-weight: 500;
    color: rgba(255,255,255,0.8);
    border-radius: var(--radius-full);
    transition: var(--transition);
}

.nav-link:hover, .nav-link.active {
    color: var(--white);
    background: rgba(255,255,255,0.15);
}

.navbar.scrolled .nav-link { color: var(--gray-600); }
.navbar.scrolled .nav-link:hover, .navbar.scrolled .nav-link.active {
    color: var(--primary);
    background: var(--primary-50);
}

.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(--white);
    border-radius: 2px;
    transition: var(--transition);
}

.navbar.scrolled .nav-toggle span { background: var(--gray-800); }

/* ================================================
   HERO SECTION
   ================================================ */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    background: linear-gradient(135deg, #1e1b4b 0%, #312e81 25%, #4338ca 50%, #6366f1 75%, #818cf8 100%);
    overflow: hidden;
    padding: 120px 0 80px;
}

.hero-bg-shapes {
    position: absolute;
    inset: 0;
    overflow: hidden;
    pointer-events: none;
}

.shape {
    position: absolute;
    border-radius: 50%;
    opacity: 0.08;
}

.shape-1 { width: 600px; height: 600px; background: var(--secondary); top: -200px; right: -100px; animation: float 20s ease-in-out infinite; }
.shape-2 { width: 400px; height: 400px; background: var(--accent); bottom: -100px; left: -100px; animation: float 25s ease-in-out infinite reverse; }
.shape-3 { width: 250px; height: 250px; background: var(--warning); top: 40%; left: 20%; animation: float 15s ease-in-out infinite; }
.shape-4 { width: 180px; height: 180px; background: var(--success); bottom: 20%; right: 15%; animation: float 18s ease-in-out infinite reverse; }

@keyframes float {
    0%, 100% { transform: translate(0, 0) scale(1); }
    25% { transform: translate(30px, -30px) scale(1.05); }
    50% { transform: translate(-20px, 20px) scale(0.95); }
    75% { transform: translate(15px, 10px) scale(1.02); }
}

.hero-content { text-align: center; position: relative; z-index: 2; }

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 20px;
    background: rgba(255,255,255,0.1);
    border: 1px solid rgba(255,255,255,0.15);
    border-radius: var(--radius-full);
    color: var(--white);
    font-size: 0.85rem;
    font-weight: 500;
    margin-bottom: 32px;
    backdrop-filter: blur(10px);
}

.hero-badge i { color: var(--warning); }

.hero h1 {
    font-family: var(--font-display);
    color: var(--white);
    margin-bottom: 28px;
}

.hero-title-line {
    display: block;
    font-size: 3.5rem;
    font-weight: 700;
    line-height: 1.15;
    letter-spacing: -0.03em;
}

.hero-title-accent {
    display: block;
    font-size: 4.5rem;
    font-weight: 700;
    line-height: 1.15;
    letter-spacing: -0.03em;
    background: linear-gradient(90deg, #f472b6, #fb923c, #facc15);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 1.2rem;
    color: rgba(255,255,255,0.75);
    max-width: 680px;
    margin: 0 auto 40px;
    line-height: 1.8;
}

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

.hero-stats {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 40px;
    flex-wrap: wrap;
}

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

.hero-stat-number, .hero-stat-suffix {
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--white);
    line-height: 1;
}

.hero-stat-label {
    display: block;
    font-size: 0.85rem;
    color: rgba(255,255,255,0.6);
    margin-top: 6px;
    max-width: 200px;
}

.hero-stat-divider {
    width: 1px;
    height: 40px;
    background: rgba(255,255,255,0.2);
}

.hero-scroll {
    position: absolute;
    bottom: 32px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 2;
}

.hero-scroll a {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 44px;
    height: 44px;
    border-radius: 50%;
    border: 2px solid rgba(255,255,255,0.3);
    color: var(--white);
    animation: bounce 2s ease-in-out infinite;
}

@keyframes bounce {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(8px); }
}

/* ================================================
   ABOUT SECTION
   ================================================ */
.about-section { background: var(--gray-50); }

.about-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
    margin-bottom: 60px;
}

.about-card {
    background: var(--white);
    border-radius: var(--radius-lg);
    padding: 36px 28px;
    text-align: center;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--gray-100);
    transition: var(--transition);
}

.about-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-xl);
    border-color: var(--primary-100);
}

.about-card-icon {
    width: 64px;
    height: 64px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--primary-50);
    color: var(--primary);
    font-size: 1.5rem;
    border-radius: var(--radius-md);
    margin: 0 auto 20px;
}

.about-card:hover .about-card-icon {
    background: var(--primary);
    color: var(--white);
}

.about-card h3 { font-size: 1.15rem; font-weight: 700; margin-bottom: 10px; color: var(--gray-900); }
.about-card p { font-size: 0.92rem; color: var(--gray-500); line-height: 1.7; }

/* Flow Diagram */
.flow-diagram {
    background: var(--white);
    border-radius: var(--radius-xl);
    padding: 48px;
    box-shadow: var(--shadow-md);
    border: 1px solid var(--gray-100);
}

.flow-title {
    text-align: center;
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: 32px;
}

.flow-steps {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 16px;
    flex-wrap: wrap;
}

.flow-step {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 10px;
    padding: 20px 24px;
    background: var(--primary-50);
    border-radius: var(--radius-md);
    min-width: 120px;
    transition: var(--transition);
}

.flow-step:hover { transform: scale(1.05); }

.flow-step-problem {
    background: linear-gradient(135deg, #FEF3C7, #FDE68A);
    border: 2px dashed var(--warning);
}

.flow-icon { font-size: 1.8rem; color: var(--primary); }
.flow-step-problem .flow-icon { color: var(--warning); }
.flow-label { font-size: 0.85rem; font-weight: 600; color: var(--gray-700); text-align: center; }
.flow-arrow { color: var(--gray-400); font-size: 1.2rem; }

/* ================================================
   PROBLEM SECTION
   ================================================ */
.problem-section { background: var(--white); }

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

.problem-text .section-tag { margin-bottom: 16px; }
.problem-text .section-title { text-align: left; margin-bottom: 28px; }

.problem-quote {
    background: linear-gradient(135deg, var(--primary-50), #EDE9FE);
    border-left: 4px solid var(--primary);
    padding: 24px 28px;
    border-radius: 0 var(--radius-md) var(--radius-md) 0;
    margin-bottom: 36px;
}

.problem-quote i { color: var(--primary); font-size: 1.2rem; margin-bottom: 8px; display: block; }
.problem-quote p { font-size: 1.1rem; font-weight: 500; color: var(--gray-800); font-style: italic; line-height: 1.7; }

.problem-points { display: flex; flex-direction: column; gap: 20px; }

.problem-point {
    display: flex;
    gap: 16px;
    align-items: flex-start;
}

.problem-point > i { font-size: 1.3rem; color: var(--danger); margin-top: 4px; flex-shrink: 0; }
.problem-point h4 { font-size: 1rem; font-weight: 700; color: var(--gray-900); margin-bottom: 4px; }
.problem-point p { font-size: 0.92rem; color: var(--gray-500); line-height: 1.6; }

.problem-visual { display: flex; flex-direction: column; align-items: center; gap: 28px; }

.problem-stat-card {
    background: var(--white);
    border-radius: var(--radius-xl);
    padding: 40px;
    text-align: center;
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--gray-100);
    width: 100%;
}

.stat-ring { width: 140px; height: 140px; margin: 0 auto 20px; position: relative; }
.stat-ring svg { width: 100%; height: 100%; transform: rotate(-90deg); }
.stat-ring-progress { transition: stroke-dashoffset 2s ease; }
.stat-ring-text {
    position: absolute;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.8rem;
    font-weight: 800;
    color: var(--primary);
}

.problem-stat-card > p { font-size: 1rem; color: var(--gray-600); }

.problem-info-cards { display: flex; flex-direction: column; gap: 12px; width: 100%; }

.info-card {
    display: flex;
    align-items: center;
    gap: 14px;
    padding: 16px 20px;
    background: var(--gray-50);
    border-radius: var(--radius-md);
    border: 1px solid var(--gray-100);
    transition: var(--transition);
}

.info-card:hover { background: var(--primary-50); border-color: var(--primary-100); }
.info-card i { font-size: 1.2rem; color: var(--primary); }
.info-card span { font-size: 0.92rem; font-weight: 500; color: var(--gray-700); }

/* ================================================
   PRODUCT SECTION
   ================================================ */
.product-section {
    background: var(--gray-50);
}

.product-hero-img {
    margin-bottom: 48px;
    text-align: center;
}

.product-hero-img img {
    width: 100%;
    max-width: 540px;
    margin: 0 auto;
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-xl);
}

.product-hero-caption {
    margin-top: 16px;
    font-size: 0.9rem;
    color: var(--gray-400);
    font-style: italic;
}

.product-duo {
    margin-bottom: 48px;
}

.product-duo-img {
    width: 100%;
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-xl);
    border: 1px solid var(--gray-100);
}

/* Design Features Grid */
.design-features-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 28px;
    margin-bottom: 60px;
}

.design-feature-card {
    padding: 36px 32px;
    border-radius: var(--radius-xl);
    border: 1px solid var(--gray-100);
    transition: var(--transition);
}

.design-feature-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-xl);
}

.camera-card {
    background: linear-gradient(135deg, #FFF9E6, #FFF3CC);
    border-color: #FCEABB;
}

.hub-card {
    background: linear-gradient(135deg, #E8F4FD, #D1ECFC);
    border-color: #B3DCF9;
}

.design-feature-icon {
    width: 56px;
    height: 56px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(255,255,255,0.7);
    border-radius: var(--radius-md);
    font-size: 1.4rem;
    color: var(--primary);
    margin-bottom: 20px;
}

.design-feature-card h3 {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: 16px;
}

.design-feature-card ul {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.design-feature-card li {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 0.95rem;
    color: var(--gray-700);
    font-weight: 500;
}

.design-feature-card li i {
    color: var(--success);
    font-size: 0.9rem;
    flex-shrink: 0;
}

/* Concept Sketch */
.concept-sketch {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 48px;
    align-items: center;
    background: var(--white);
    border-radius: var(--radius-xl);
    padding: 40px;
    box-shadow: var(--shadow-md);
    border: 1px solid var(--gray-100);
}

.concept-sketch-inner img {
    width: 100%;
    border-radius: var(--radius-lg);
}

.concept-sketch-info h3 {
    font-family: var(--font-display);
    font-size: 1.6rem;
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: 14px;
}

.concept-sketch-info p {
    font-size: 0.95rem;
    color: var(--gray-500);
    line-height: 1.8;
    margin-bottom: 20px;
}

.dimension-tags {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
}

.dim-tag {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 8px 16px;
    background: var(--primary-50);
    border-radius: var(--radius-full);
    font-size: 0.82rem;
    font-weight: 600;
    color: var(--primary);
}

/* ================================================
   HOW IT WORKS / USER MANUAL
   ================================================ */
.howworks-section {
    background: var(--white);
}

.user-manual-img {
    margin-bottom: 60px;
    text-align: center;
}

.user-manual-img img {
    width: 100%;
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-2xl);
    border: 1px solid var(--gray-100);
}

.howworks-steps {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 20px;
    margin-bottom: 72px;
}

.howworks-step {
    text-align: center;
    padding: 28px 16px;
    background: var(--gray-50);
    border-radius: var(--radius-lg);
    border: 1px solid var(--gray-100);
    position: relative;
    transition: var(--transition);
}

.howworks-step:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-100);
}

.step-number {
    position: absolute;
    top: -14px;
    left: 50%;
    transform: translateX(-50%);
    width: 28px;
    height: 28px;
    background: var(--primary);
    color: var(--white);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.8rem;
    font-weight: 800;
    border: 3px solid var(--white);
    box-shadow: var(--shadow-sm);
}

.step-icon {
    width: 52px;
    height: 52px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--primary-50);
    color: var(--primary);
    font-size: 1.2rem;
    border-radius: var(--radius-md);
    margin: 8px auto 14px;
}

.howworks-step h4 {
    font-size: 0.95rem;
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: 8px;
}

.howworks-step p {
    font-size: 0.82rem;
    color: var(--gray-500);
    line-height: 1.6;
}

/* System Architecture Image */
.sys-arch-img {
    background: var(--white);
    border-radius: var(--radius-xl);
    padding: 40px;
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--gray-100);
    text-align: center;
}

.arch-title {
    font-family: var(--font-display);
    font-size: 1.4rem;
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: 28px;
}

.sys-arch-img > img {
    width: 100%;
    border-radius: var(--radius-md);
    margin-bottom: 24px;
}

.arch-legend {
    display: flex;
    justify-content: center;
    gap: 28px;
    flex-wrap: wrap;
}

.legend-item {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--gray-600);
}

.legend-dot {
    width: 14px;
    height: 14px;
    border-radius: 4px;
    flex-shrink: 0;
}

/* ================================================
   SUBSYSTEM DETAILS
   ================================================ */
.subsystems-section {
    background: var(--gray-50);
}

.subsystem-block {
    background: var(--white);
    border-radius: var(--radius-xl);
    padding: 40px;
    margin-bottom: 40px;
    box-shadow: var(--shadow-md);
    border: 1px solid var(--gray-100);
    transition: var(--transition);
}

.subsystem-block:hover {
    box-shadow: var(--shadow-xl);
}

.subsystem-block:last-child {
    margin-bottom: 0;
}

.subsystem-header {
    display: flex;
    align-items: center;
    gap: 20px;
    margin-bottom: 32px;
    padding-bottom: 24px;
    border-bottom: 1px solid var(--gray-100);
}

.subsystem-badge {
    width: 52px;
    height: 52px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-md);
    font-size: 1.1rem;
    font-weight: 900;
    color: var(--white);
    flex-shrink: 0;
}

.ss1 { background: linear-gradient(135deg, #6366f1, #8b5cf6); }
.ss2 { background: linear-gradient(135deg, #f59e0b, #ef4444); }
.ss3 { background: linear-gradient(135deg, #06b6d4, #10b981); }

.subsystem-header h3 {
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--gray-900);
}

.subsystem-subtitle {
    font-size: 0.9rem;
    color: var(--gray-400);
    margin-top: 2px;
}

.subsystem-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 36px;
    align-items: start;
}

.subsystem-images img {
    width: 100%;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    border: 1px solid var(--gray-100);
    transition: var(--transition);
}

.subsystem-images img:hover {
    box-shadow: var(--shadow-xl);
}

.subsystem-details {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.spec-group h4 {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 1rem;
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: 14px;
}

.spec-group h4 i {
    color: var(--primary);
    font-size: 1rem;
}

.spec-list {
    display: flex;
    flex-direction: column;
    gap: 8px;
    padding-left: 4px;
}

.spec-list li {
    font-size: 0.9rem;
    color: var(--gray-600);
    line-height: 1.6;
    padding-left: 16px;
    position: relative;
}

.spec-list li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 10px;
    width: 6px;
    height: 6px;
    background: var(--primary-light);
    border-radius: 50%;
}

.spec-list li strong {
    color: var(--gray-800);
    font-weight: 600;
}

/* Subsystem Workflow */
.subsystem-workflow {
    margin-top: 28px;
    padding-top: 28px;
    border-top: 1px solid var(--gray-100);
}

.subsystem-workflow h4 {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 1rem;
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: 20px;
}

.subsystem-workflow h4 i { color: var(--primary); }

.subsystem-workflow img {
    width: 100%;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    border: 1px solid var(--gray-100);
    transition: var(--transition);
}

.subsystem-workflow img:hover {
    box-shadow: var(--shadow-xl);
}

/* Subsystem Extra Images */
.subsystem-extra-images {
    margin-top: 28px;
    padding-top: 28px;
    border-top: 1px solid var(--gray-100);
}

.subsystem-extra-images img {
    width: 100%;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    border: 1px solid var(--gray-100);
    transition: var(--transition);
}

.subsystem-extra-images img:hover {
    box-shadow: var(--shadow-xl);
}

.subsystem-extra-images.two-col {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 24px;
}

/* ================================================
   TESTING SECTION
   ================================================ */
.testing-section { background: var(--white); }

.testing-process {
    display: flex;
    align-items: flex-start;
    justify-content: center;
    gap: 0;
    margin-bottom: 64px;
    flex-wrap: wrap;
}

.process-step {
    text-align: center;
    position: relative;
    flex: 1;
    min-width: 200px;
    padding: 0 16px;
}

.process-icon {
    width: 64px;
    height: 64px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--primary-50);
    color: var(--primary);
    font-size: 1.3rem;
    border-radius: 50%;
    margin: 0 auto 12px;
    position: relative;
    z-index: 2;
}

.process-number {
    font-size: 0.75rem;
    font-weight: 800;
    color: var(--white);
    background: var(--primary);
    width: 24px;
    height: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    position: absolute;
    top: -4px;
    right: -4px;
    z-index: 3;
    border: 2px solid var(--white);
}

.process-step h4 { font-size: 1rem; font-weight: 700; color: var(--gray-900); margin-bottom: 8px; }
.process-step p { font-size: 0.85rem; color: var(--gray-500); line-height: 1.6; }

.process-connector {
    width: 60px;
    height: 2px;
    background: var(--gray-200);
    margin-top: 32px;
    flex-shrink: 0;
}

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

.testimonial-card {
    background: var(--gray-50);
    border-radius: var(--radius-lg);
    padding: 32px;
    border: 1px solid var(--gray-100);
    transition: var(--transition);
}

.testimonial-card:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-4px);
}

.testimonial-stars { margin-bottom: 16px; }
.testimonial-stars i { color: var(--warning); font-size: 0.9rem; }

.testimonial-card > p {
    font-size: 0.95rem;
    color: var(--gray-600);
    line-height: 1.7;
    font-style: italic;
    margin-bottom: 24px;
    min-height: 80px;
}

.testimonial-author { display: flex; align-items: center; gap: 12px; }
.author-avatar { font-size: 2.2rem; color: var(--gray-300); }
.testimonial-author strong { display: block; font-size: 0.9rem; color: var(--gray-900); }
.testimonial-author span { font-size: 0.8rem; color: var(--gray-400); }

/* ================================================
   MARKET SECTION
   ================================================ */
.market-section { background: var(--gray-50); }

.market-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
    margin-bottom: 60px;
}

.market-card {
    background: var(--white);
    border-radius: var(--radius-lg);
    padding: 36px;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--gray-100);
    text-align: center;
    transition: var(--transition);
}

.market-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-xl);
}

.market-card-header { margin-bottom: 20px; }
.market-card-header i { font-size: 2rem; color: var(--primary); margin-bottom: 12px; display: block; }
.market-card-header h3 { font-size: 1.1rem; font-weight: 700; color: var(--gray-900); }

.market-stat-big {
    font-size: 3rem;
    font-weight: 900;
    color: var(--primary);
    margin-bottom: 12px;
    letter-spacing: -0.02em;
}

.market-card p { font-size: 0.92rem; color: var(--gray-500); line-height: 1.7; }

/* Competitive Section */
.competitive-section { text-align: center; }
.competitive-section h3 {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: 36px;
}

.advantage-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}

.advantage-item {
    padding: 28px 20px;
    background: var(--white);
    border-radius: var(--radius-lg);
    border: 1px solid var(--gray-100);
    text-align: center;
    transition: var(--transition);
}

.advantage-item:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-4px);
    border-color: var(--primary-100);
}

.advantage-icon {
    width: 52px;
    height: 52px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--primary-50);
    color: var(--primary);
    font-size: 1.2rem;
    border-radius: var(--radius-md);
    margin: 0 auto 16px;
}

.advantage-item h4 { font-size: 0.95rem; font-weight: 700; color: var(--gray-900); margin-bottom: 8px; }
.advantage-item p { font-size: 0.85rem; color: var(--gray-500); line-height: 1.6; }

/* ================================================
   TEAM SECTION
   ================================================ */
.team-section { background: var(--white); }

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

.team-card {
    text-align: center;
    padding: 28px 16px;
    border-radius: var(--radius-lg);
    border: 1px solid var(--gray-100);
    background: var(--gray-50);
    transition: var(--transition);
}

.team-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-100);
    background: var(--white);
}

.team-card h4 { font-size: 1.05rem; font-weight: 700; color: var(--gray-900); margin-bottom: 4px; }
.team-card p { font-size: 0.82rem; color: var(--gray-400); }



/* ================================================
   FOOTER
   ================================================ */
.footer {
    background: var(--gray-900);
    padding: 60px 0 0;
}

.footer-content {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: 48px;
    padding-bottom: 40px;
    border-bottom: 1px solid rgba(255,255,255,0.08);
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 1.3rem;
    font-weight: 800;
    color: var(--white);
    margin-bottom: 14px;
}

.footer-logo i { color: var(--primary-light); }
.footer-brand p { font-size: 0.9rem; color: var(--gray-400); line-height: 1.7; max-width: 350px; }

.footer-links h4 {
    font-size: 0.9rem;
    font-weight: 700;
    color: var(--white);
    text-transform: uppercase;
    letter-spacing: 0.08em;
    margin-bottom: 16px;
}

.footer-links a {
    display: block;
    font-size: 0.88rem;
    color: var(--gray-400);
    padding: 6px 0;
    transition: var(--transition);
}

.footer-links a:hover { color: var(--primary-light); padding-left: 4px; }
.footer-bottom { padding: 24px 0; text-align: center; }
.footer-bottom p { font-size: 0.85rem; color: var(--gray-500); }

/* ================================================
   BACK TO TOP
   ================================================ */
.back-to-top {
    position: fixed;
    bottom: 32px;
    right: 32px;
    width: 48px;
    height: 48px;
    background: var(--primary);
    color: var(--white);
    border: none;
    border-radius: 50%;
    font-size: 1.1rem;
    cursor: pointer;
    box-shadow: var(--shadow-lg);
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px);
    transition: var(--transition);
    z-index: 999;
    display: flex;
    align-items: center;
    justify-content: center;
}

.back-to-top.visible { opacity: 1; visibility: visible; transform: translateY(0); }
.back-to-top:hover { background: var(--primary-dark); transform: translateY(-3px); }

/* ================================================
   LIGHTBOX
   ================================================ */
.lightbox-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,0.88);
    z-index: 2000;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 40px;
    cursor: zoom-out;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.lightbox-overlay.active {
    opacity: 1;
}

.lightbox-overlay.closing {
    opacity: 0;
}

.lightbox-overlay img {
    max-width: 100%;
    max-height: 90vh;
    border-radius: var(--radius-lg);
    box-shadow: 0 0 60px rgba(0,0,0,0.5);
    object-fit: contain;
    cursor: default;
}

/* ================================================
   RESPONSIVE DESIGN
   ================================================ */
@media (max-width: 1024px) {
    .about-grid { grid-template-columns: repeat(2, 1fr); }
    .advantage-grid { grid-template-columns: repeat(2, 1fr); }
    .team-grid { grid-template-columns: repeat(3, 1fr); }
    .testimonials { grid-template-columns: repeat(2, 1fr); }
    .howworks-steps { grid-template-columns: repeat(3, 1fr); }
    .subsystem-extra-images.two-col { grid-template-columns: 1fr; }
}

@media (max-width: 768px) {
    .section { padding: 72px 0; }
    .section-title { font-size: 2rem; }
    .section-header { margin-bottom: 48px; }

    .hero-title-line { font-size: 2.2rem; }
    .hero-title-accent { font-size: 2.8rem; }

    /* Mobile Nav */
    .nav-menu {
        position: fixed;
        top: 0;
        right: -100%;
        width: 280px;
        height: 100vh;
        background: var(--white);
        flex-direction: column;
        padding: 80px 24px 24px;
        gap: 4px;
        box-shadow: var(--shadow-2xl);
        transition: var(--transition-slow);
        overflow-y: auto;
    }

    .nav-menu.open { right: 0; }
    .nav-menu .nav-link { color: var(--gray-600); padding: 12px 16px; width: 100%; border-radius: var(--radius-md); }
    .nav-menu .nav-link:hover, .nav-menu .nav-link.active { color: var(--primary); background: var(--primary-50); }
    .nav-toggle { display: flex; z-index: 1001; }
    .nav-toggle.open span:nth-child(1) { transform: rotate(45deg) translate(5px, 5px); }
    .nav-toggle.open span:nth-child(2) { opacity: 0; }
    .nav-toggle.open span:nth-child(3) { transform: rotate(-45deg) translate(5px, -5px); }

    .problem-content { grid-template-columns: 1fr; gap: 40px; }
    .design-features-grid { grid-template-columns: 1fr; }
    .concept-sketch { grid-template-columns: 1fr; gap: 28px; padding: 28px; }
    .howworks-steps { grid-template-columns: repeat(2, 1fr); }
    .subsystem-content { grid-template-columns: 1fr; }
    .subsystem-extra-images.two-col { grid-template-columns: 1fr; }

    .footer-content { grid-template-columns: 1fr; gap: 32px; }
    .hero-stats { gap: 24px; }
    .hero-stat-divider { display: none; }
    .about-grid { grid-template-columns: 1fr; }
    .market-grid { grid-template-columns: 1fr; }
    .advantage-grid { grid-template-columns: 1fr; }
    .team-grid { grid-template-columns: repeat(2, 1fr); }
    .testimonials { grid-template-columns: 1fr; }

    .testing-process { flex-direction: column; align-items: center; gap: 8px; }
    .process-connector { width: 2px; height: 30px; margin: 0; }

    .flow-steps { flex-direction: column; }
    .flow-arrow { transform: rotate(90deg); }

    .cta-content h2 { font-size: 2rem; }

    .subsystem-block { padding: 28px; }
    .sys-arch-img { padding: 24px; }
}

@media (max-width: 480px) {
    .container { padding: 0 16px; }
    .hero-title-line { font-size: 1.8rem; }
    .hero-title-accent { font-size: 2.2rem; }
    .hero-subtitle { font-size: 1rem; }
    .btn { padding: 12px 24px; font-size: 0.9rem; }
    .team-grid { grid-template-columns: repeat(2, 1fr); gap: 16px; }
    .section-title { font-size: 1.7rem; }
    .hero-actions { flex-direction: column; align-items: center; }
    .flow-diagram { padding: 24px; }
    .howworks-steps { grid-template-columns: 1fr; }
    .subsystem-block { padding: 20px; }
    .subsystem-header { flex-direction: column; text-align: center; gap: 12px; }
    .arch-legend { flex-direction: column; align-items: center; }
    .hero-stat-number, .hero-stat-suffix { font-size: 2rem; }
}