/* ============================================
   ONEp1 Landing Page v5 - Professional Design
   Based on SaaS best practices 2025
   ============================================ */

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

:root {
    /* Colors */
    --color-primary: #2563eb;
    --color-primary-dark: #1e40af;
    --color-primary-light: #3b82f6;
    --color-secondary: #eab308;
    --color-success: #10b981;
    --color-danger: #ef4444;
    --color-warning: #f59e0b;

    /* Gradients */
    --gradient-primary: linear-gradient(135deg, #2563eb 0%, #1e40af 100%);
    --gradient-success: linear-gradient(135deg, #10b981 0%, #059669 100%);
    --gradient-hero: linear-gradient(135deg, #69B9FF 0%, #2563eb 50%, #1e3a8a 100%);

    /* Neutrals */
    --color-white: #ffffff;
    --color-gray-50: #f9fafb;
    --color-gray-100: #f3f4f6;
    --color-gray-200: #e5e7eb;
    --color-gray-300: #d1d5db;
    --color-gray-400: #9ca3af;
    --color-gray-500: #6b7280;
    --color-gray-600: #4b5563;
    --color-gray-700: #374151;
    --color-gray-800: #1f2937;
    --color-gray-900: #111827;

    /* Typography */
    --font-family: 'Montserrat', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-size-xs: 0.75rem;    /* 12px */
    --font-size-sm: 0.875rem;   /* 14px */
    --font-size-base: 1rem;     /* 16px */
    --font-size-lg: 1.125rem;   /* 18px */
    --font-size-xl: 1.25rem;    /* 20px */
    --font-size-2xl: 1.5rem;    /* 24px */
    --font-size-3xl: 1.875rem;  /* 30px */
    --font-size-4xl: 2.25rem;   /* 36px */
    --font-size-5xl: 3rem;      /* 48px */
    --font-size-6xl: 3.75rem;   /* 60px */

    /* Spacing */
    --spacing-1: 0.25rem;   /* 4px */
    --spacing-2: 0.5rem;    /* 8px */
    --spacing-3: 0.75rem;   /* 12px */
    --spacing-4: 1rem;      /* 16px */
    --spacing-5: 1.25rem;   /* 20px */
    --spacing-6: 1.5rem;    /* 24px */
    --spacing-8: 2rem;      /* 32px */
    --spacing-10: 2.5rem;   /* 40px */
    --spacing-12: 3rem;     /* 48px */
    --spacing-16: 4rem;     /* 64px */
    --spacing-20: 5rem;     /* 80px */
    --spacing-24: 6rem;     /* 96px */

    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --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);
    --shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);

    /* Border Radius */
    --radius-sm: 0.25rem;   /* 4px */
    --radius-md: 0.5rem;    /* 8px */
    --radius-lg: 0.75rem;   /* 12px */
    --radius-xl: 1rem;      /* 16px */
    --radius-2xl: 1.5rem;   /* 24px */
    --radius-full: 9999px;

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 200ms ease;
    --transition-slow: 300ms ease;
}

/* ============================================
   Base Styles
   ============================================ */

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    line-height: 1.6;
    color: var(--color-gray-800);
    background-color: var(--color-white);
    overflow-x: hidden;
}

.container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 var(--spacing-6);
}

section {
    padding: var(--spacing-20) 0;
}

/* ============================================
   Typography
   ============================================ */

h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    line-height: 1.2;
    color: var(--color-gray-900);
}

h1 { font-size: var(--font-size-5xl); }
h2 { font-size: var(--font-size-4xl); }
h3 { font-size: var(--font-size-2xl); }
h4 { font-size: var(--font-size-xl); }

.gradient-text {
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* ============================================
   Buttons
   ============================================ */

button {
    border: none;
    cursor: pointer;
    font-family: inherit;
    font-weight: 600;
    transition: all var(--transition-base);
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-2);
    justify-content: center;
}

.btn-primary {
    background: var(--gradient-primary);
    color: var(--color-white);
    padding: var(--spacing-3) var(--spacing-6);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
}

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

.btn-secondary {
    background: var(--color-white);
    color: var(--color-primary);
    padding: var(--spacing-3) var(--spacing-6);
    border-radius: var(--radius-lg);
    border: 2px solid var(--color-primary);
}

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

.btn-outline {
    background: transparent;
    color: var(--color-white);
    padding: var(--spacing-3) var(--spacing-6);
    border-radius: var(--radius-lg);
    border: 2px solid var(--color-white);
}

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

.btn-large {
    padding: var(--spacing-4) var(--spacing-8);
    font-size: var(--font-size-lg);
}

/* ============================================
   Navigation
   ============================================ */

.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow-sm);
    border-bottom: 1px solid var(--color-gray-200);
}

.nav-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-4) 0;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-3);
}

.logo-img {
    height: 40px;
    width: auto;
}

.logo-text {
    font-size: var(--font-size-2xl);
    font-weight: 800;
    color: var(--color-primary);
}

.nav-links {
    display: flex;
    align-items: center;
    gap: var(--spacing-8);
}

.nav-links a {
    text-decoration: none;
    color: var(--color-gray-700);
    font-weight: 500;
    transition: color var(--transition-fast);
}

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

.mobile-menu-btn {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    padding: var(--spacing-2);
}

.mobile-menu-btn span {
    width: 25px;
    height: 3px;
    background: var(--color-gray-700);
    border-radius: var(--radius-full);
}

/* ============================================
   Dropdown Menu (Login/Account)
   ============================================ */
.dropdown-menu {
    display: none;
    position: absolute;
    right: 0;
    top: calc(100% + 12px);
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-radius: 12px;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.15);
    min-width: 220px;
    z-index: 1000;
    border: 1px solid rgba(255, 255, 255, 0.5);
    overflow: hidden;
}

.dropdown-menu.active {
    display: block;
    animation: slideDown 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

@keyframes slideDown {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.dropdown-menu a {
    display: block;
    padding: 14px 20px;
    color: #1f2937;
    text-decoration: none;
    font-weight: 500;
    font-size: 0.9375rem;
    transition: all 0.2s;
}

.dropdown-menu a:hover {
    background: rgba(37, 99, 235, 0.1);
    color: #2563eb;
    padding-left: 24px;
}

/* ============================================
   Hero Section
   ============================================ */

.hero {
    position: relative;
    padding: calc(var(--spacing-24) + 60px) 0 var(--spacing-24);
    min-height: 100vh;
    display: flex;
    align-items: center;
    overflow: hidden;
}

.hero-background {
    position: absolute;
    inset: 0;
    background: var(--gradient-hero);
    background-size: 400% 400%;
    animation: gradientShift 15s ease infinite;
    z-index: -1;
}

@keyframes gradientShift {
    0%, 100% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
}

.hero-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-16);
    align-items: center;
}

.hero-text {
    color: var(--color-white);
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-2);
    background: rgba(255, 255, 255, 0.2);
    backdrop-filter: blur(10px);
    padding: var(--spacing-2) var(--spacing-4);
    border-radius: var(--radius-full);
    font-size: var(--font-size-sm);
    font-weight: 600;
    margin-bottom: var(--spacing-6);
}

.hero-title {
    font-size: var(--font-size-6xl);
    font-weight: 800;
    margin-bottom: var(--spacing-6);
    line-height: 1.1;
    color: var(--color-white);
}

.hero-subtitle {
    font-size: var(--font-size-xl);
    margin-bottom: var(--spacing-8);
    opacity: 0.95;
    line-height: 1.6;
}

.hero-cta {
    display: flex;
    gap: var(--spacing-4);
    margin-bottom: var(--spacing-12);
}

.hero-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-8);
}

.stat {
    text-align: center;
}

.stat-value {
    font-size: var(--font-size-4xl);
    font-weight: 800;
    color: var(--color-white);
    margin-bottom: var(--spacing-1);
}

.stat-label {
    font-size: var(--font-size-sm);
    opacity: 0.9;
}

/* Hero Visual */
.hero-visual {
    position: relative;
}

.device-mockup {
    background: var(--color-white);
    border-radius: var(--radius-2xl);
    padding: var(--spacing-6);
    box-shadow: var(--shadow-2xl);
    position: relative;
}

.mockup-screen {
    background: var(--color-gray-100);
    border-radius: var(--radius-xl);
    padding: var(--spacing-4);
    min-height: 400px;
    position: relative;
    overflow: hidden;
}

.mockup-screen img {
    width: 100%;
    height: auto;
    border-radius: var(--radius-lg);
}

.live-indicator {
    position: absolute;
    top: var(--spacing-4);
    right: var(--spacing-4);
    display: flex;
    align-items: center;
    gap: var(--spacing-2);
    background: var(--color-success);
    color: var(--color-white);
    padding: var(--spacing-2) var(--spacing-4);
    border-radius: var(--radius-full);
    font-size: var(--font-size-sm);
    font-weight: 600;
}

.pulse-dot {
    width: 8px;
    height: 8px;
    background: var(--color-white);
    border-radius: var(--radius-full);
    animation: pulse 2s ease infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; transform: scale(1); }
    50% { opacity: 0.5; transform: scale(1.2); }
}

.floating-card {
    position: absolute;
    background: var(--color-white);
    padding: var(--spacing-4);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-xl);
    display: flex;
    align-items: center;
    gap: var(--spacing-3);
    animation: float 3s ease-in-out infinite;
}

.floating-card svg {
    color: var(--color-primary);
}

.card-1 {
    top: 10%;
    right: -10%;
    animation-delay: 0s;
}

.card-2 {
    bottom: 10%;
    left: -10%;
    animation-delay: 1.5s;
}

@keyframes float {
    0%, 100% { transform: translateY(0px); }
    50% { transform: translateY(-20px); }
}

.card-label {
    font-size: var(--font-size-xs);
    color: var(--color-gray-500);
    text-transform: uppercase;
    font-weight: 600;
}

.card-value {
    font-size: var(--font-size-lg);
    font-weight: 700;
    color: var(--color-gray-900);
}

/* ============================================
   Problem/Solution Section
   ============================================ */

.problem-solution {
    background: var(--color-gray-50);
}

.section-header {
    margin-bottom: var(--spacing-12);
}

.section-header.center {
    text-align: center;
}

.section-badge {
    display: inline-block;
    background: var(--color-primary);
    color: var(--color-white);
    padding: var(--spacing-2) var(--spacing-4);
    border-radius: var(--radius-full);
    font-size: var(--font-size-sm);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: var(--spacing-4);
}

.section-subtitle {
    font-size: var(--font-size-lg);
    color: var(--color-gray-600);
    max-width: 700px;
    margin: var(--spacing-4) auto 0;
}

.problem-solution-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-8);
}

.problem-card, .solution-card {
    background: var(--color-white);
    padding: var(--spacing-8);
    border-radius: var(--radius-2xl);
    box-shadow: var(--shadow-lg);
}

.icon-wrapper {
    width: 64px;
    height: 64px;
    border-radius: var(--radius-xl);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: var(--spacing-6);
}

.icon-wrapper.red {
    background: rgba(239, 68, 68, 0.1);
    color: var(--color-danger);
}

.icon-wrapper.green {
    background: rgba(16, 185, 129, 0.1);
    color: var(--color-success);
}

.problem-list, .solution-list {
    list-style: none;
    margin: var(--spacing-6) 0;
}

.problem-list li, .solution-list li {
    padding: var(--spacing-3) 0;
    padding-left: var(--spacing-8);
    position: relative;
}

.problem-list li::before {
    content: "✗";
    position: absolute;
    left: 0;
    color: var(--color-danger);
    font-weight: 700;
}

.solution-list li::before {
    content: "✓";
    position: absolute;
    left: 0;
    color: var(--color-success);
    font-weight: 700;
}

.cost-indicator {
    margin-top: var(--spacing-6);
    padding: var(--spacing-4);
    border-radius: var(--radius-lg);
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-weight: 600;
}

.cost-indicator.negative {
    background: rgba(239, 68, 68, 0.1);
    color: var(--color-danger);
}

.cost-indicator.positive {
    background: rgba(16, 185, 129, 0.1);
    color: var(--color-success);
}

.cost-value {
    font-size: var(--font-size-2xl);
    font-weight: 800;
}

/* ============================================
   Features Section
   ============================================ */

.features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-8);
}

.feature-card {
    background: var(--color-white);
    padding: var(--spacing-8);
    border-radius: var(--radius-2xl);
    box-shadow: var(--shadow-md);
    transition: all var(--transition-base);
    position: relative;
}

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

.feature-card.featured {
    background: var(--gradient-primary);
    color: var(--color-white);
}

.feature-card.featured h3,
.feature-card.featured p,
.feature-card.featured li {
    color: var(--color-white);
}

.feature-badge {
    position: absolute;
    top: -12px;
    right: var(--spacing-6);
    background: var(--color-secondary);
    color: var(--color-gray-900);
    padding: var(--spacing-1) var(--spacing-3);
    border-radius: var(--radius-full);
    font-size: var(--font-size-xs);
    font-weight: 700;
    text-transform: uppercase;
}

.feature-icon {
    width: 80px;
    height: 80px;
    background: rgba(37, 99, 235, 0.1);
    border-radius: var(--radius-xl);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: var(--spacing-6);
}

.feature-card.featured .feature-icon {
    background: rgba(255, 255, 255, 0.2);
}

.feature-icon svg {
    color: var(--color-primary);
}

.feature-card.featured .feature-icon svg {
    color: var(--color-white);
}

.feature-card h3 {
    margin-bottom: var(--spacing-4);
}

.feature-card p {
    color: var(--color-gray-600);
    margin-bottom: var(--spacing-4);
}

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

.feature-list li {
    padding: var(--spacing-2) 0;
    padding-left: var(--spacing-6);
    position: relative;
    font-size: var(--font-size-sm);
    color: var(--color-gray-600);
}

.feature-card.featured .feature-list li {
    color: rgba(255, 255, 255, 0.9);
}

.feature-list li::before {
    content: "→";
    position: absolute;
    left: 0;
    color: var(--color-primary);
    font-weight: 700;
}

.feature-card.featured .feature-list li::before {
    color: var(--color-white);
}

/* ============================================
   How It Works Section
   ============================================ */

.how-it-works {
    background: var(--color-white);
}

.how-it-works-visual {
    background: var(--color-gray-50);
    padding: var(--spacing-12);
    border-radius: var(--radius-2xl);
    margin-bottom: var(--spacing-16);
}

.simple-explanation {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-6);
}

.explanation-card {
    background: var(--color-white);
    padding: var(--spacing-6);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-md);
}

.explanation-card h3 {
    font-size: var(--font-size-lg);
    margin-bottom: var(--spacing-4);
    color: var(--color-gray-800);
}

.explanation-card.highlight {
    background: rgba(234, 179, 8, 0.1);
    border: 2px solid var(--color-secondary);
}

.explanation-card.solution {
    background: rgba(16, 185, 129, 0.1);
    border: 2px solid var(--color-success);
}

.explanation-list {
    list-style: none;
    padding: 0;
}

.explanation-list li {
    padding: var(--spacing-3) 0;
    font-size: var(--font-size-sm);
    line-height: 1.6;
    color: var(--color-gray-700);
}

.explanation-list li.problem {
    color: var(--color-danger);
    font-weight: 600;
    padding-top: var(--spacing-4);
    margin-top: var(--spacing-2);
    border-top: 1px solid var(--color-gray-200);
}

.explanation-list li.success {
    color: var(--color-success);
    font-weight: 600;
    padding-top: var(--spacing-4);
    margin-top: var(--spacing-2);
    border-top: 1px solid var(--color-gray-200);
}

.system-diagram {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--spacing-8);
    position: relative;
    margin-bottom: var(--spacing-12);
}

.diagram-element {
    text-align: center;
    padding: var(--spacing-6);
    background: var(--color-white);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-md);
}

.diagram-element svg {
    color: var(--color-primary);
    margin-bottom: var(--spacing-3);
}

.diagram-element.onep1-device {
    background: var(--gradient-primary);
    color: var(--color-white);
}

.diagram-element.onep1-device svg {
    color: var(--color-white);
}

.diagram-element span {
    display: block;
    font-weight: 600;
    margin-bottom: var(--spacing-2);
}

.diagram-element .highlight {
    color: var(--color-white);
    font-size: var(--font-size-xl);
}

.diagram-value {
    font-size: var(--font-size-sm);
    color: var(--color-gray-600);
    font-weight: 500;
}

.diagram-element.onep1-device .diagram-value {
    color: rgba(255, 255, 255, 0.9);
}

.diagram-value.status-on {
    color: var(--color-success);
    font-weight: 700;
}

.connection-lines {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
}

.flow-line {
    stroke-dasharray: 5, 5;
    animation: dash 20s linear infinite;
}

@keyframes dash {
    to { stroke-dashoffset: -100; }
}

.steps-container {
    display: grid;
    gap: var(--spacing-8);
}

.step {
    display: grid;
    grid-template-columns: 80px 1fr;
    gap: var(--spacing-6);
    align-items: start;
}

.step-number {
    width: 80px;
    height: 80px;
    background: var(--gradient-primary);
    color: var(--color-white);
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--font-size-4xl);
    font-weight: 800;
    box-shadow: var(--shadow-lg);
}

.step-content h3 {
    margin-bottom: var(--spacing-3);
}

.step-content p {
    color: var(--color-gray-600);
    margin-bottom: var(--spacing-4);
}

.step-details {
    display: flex;
    gap: var(--spacing-6);
    flex-wrap: wrap;
}

.detail-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-2);
    font-size: var(--font-size-sm);
    color: var(--color-success);
    font-weight: 600;
}

.detail-item svg {
    color: var(--color-success);
}

/* ============================================
   Specs Section
   ============================================ */

.specs {
    background: var(--color-gray-50);
}

.specs-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-8);
}

.spec-category {
    background: var(--color-white);
    padding: var(--spacing-8);
    border-radius: var(--radius-2xl);
    box-shadow: var(--shadow-md);
}

.spec-category h3 {
    display: flex;
    align-items: center;
    gap: var(--spacing-3);
    margin-bottom: var(--spacing-6);
    color: var(--color-primary);
}

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

.spec-list li {
    padding: var(--spacing-3) 0;
    border-bottom: 1px solid var(--color-gray-200);
    font-size: var(--font-size-sm);
}

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

.spec-list strong {
    color: var(--color-gray-900);
    font-weight: 600;
}

/* ============================================
   Use Cases Section
   ============================================ */

.use-cases-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-8);
}

.use-case-card {
    background: var(--color-white);
    padding: var(--spacing-8);
    border-radius: var(--radius-2xl);
    box-shadow: var(--shadow-md);
    text-align: center;
    transition: all var(--transition-base);
}

.use-case-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-xl);
}

.use-case-icon {
    font-size: 60px;
    margin-bottom: var(--spacing-4);
    color: var(--color-primary);
}

.use-case-icon svg {
    color: var(--color-primary);
    stroke-width: 2;
}

.use-case-card h3 {
    margin-bottom: var(--spacing-3);
}

.use-case-card p {
    color: var(--color-gray-600);
    margin-bottom: var(--spacing-4);
}

.use-case-benefit {
    background: rgba(16, 185, 129, 0.1);
    color: var(--color-success);
    padding: var(--spacing-3) var(--spacing-4);
    border-radius: var(--radius-lg);
    font-weight: 600;
    font-size: var(--font-size-sm);
}

/* ============================================
   FAQ Section
   ============================================ */

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

.faq-container {
    max-width: 900px;
    margin: 0 auto;
}

.faq-item {
    border-bottom: 1px solid var(--color-gray-200);
    padding: var(--spacing-6) 0;
}

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

.faq-question {
    display: flex;
    justify-content: space-between;
    align-items: center;
    cursor: pointer;
    transition: color var(--transition-base);
}

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

.faq-question h3 {
    font-size: var(--font-size-lg);
    font-weight: 600;
}

.faq-question svg {
    transition: transform var(--transition-base);
    color: var(--color-gray-400);
}

.faq-item.open .faq-question svg {
    transform: rotate(180deg);
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height var(--transition-slow);
}

.faq-item.open .faq-answer {
    max-height: 500px;
    padding-top: var(--spacing-4);
}

.faq-answer p {
    color: var(--color-gray-600);
    line-height: 1.8;
}

/* ============================================
   CTA Section
   ============================================ */

.cta {
    background: var(--gradient-primary);
    color: var(--color-white);
    text-align: center;
}

.cta-content h2 {
    color: var(--color-white);
    font-size: var(--font-size-5xl);
    margin-bottom: var(--spacing-4);
}

.cta-content p {
    font-size: var(--font-size-xl);
    margin-bottom: var(--spacing-8);
    opacity: 0.95;
}

.cta-buttons {
    display: flex;
    gap: var(--spacing-4);
    justify-content: center;
    margin-bottom: var(--spacing-6);
}

.cta-note {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-2);
    font-size: var(--font-size-sm);
    opacity: 0.9;
}

/* ============================================
   Footer
   ============================================ */

.footer {
    background: var(--color-gray-900);
    color: var(--color-gray-300);
    padding: var(--spacing-16) 0 var(--spacing-8);
}

.footer-content {
    display: grid;
    grid-template-columns: 2fr 3fr;
    gap: var(--spacing-16);
    margin-bottom: var(--spacing-12);
}

.footer-brand {
    max-width: 400px;
}

.footer-logo {
    height: 40px;
    margin-bottom: var(--spacing-4);
}

.footer-links {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-8);
}

.footer-column h4 {
    color: var(--color-white);
    font-size: var(--font-size-base);
    margin-bottom: var(--spacing-4);
}

.footer-column a {
    display: block;
    color: var(--color-gray-400);
    text-decoration: none;
    padding: var(--spacing-2) 0;
    transition: color var(--transition-fast);
}

.footer-column a:hover {
    color: var(--color-white);
}

.footer-bottom {
    border-top: 1px solid var(--color-gray-800);
    padding-top: var(--spacing-8);
    text-align: center;
}

.footer-tech {
    margin-top: var(--spacing-2);
    font-size: var(--font-size-sm);
    color: var(--color-gray-500);
}

/* ============================================
   Responsive Design
   ============================================ */

@media (max-width: 1024px) {
    .hero-content {
        grid-template-columns: 1fr;
        gap: var(--spacing-12);
    }

    .hero-visual {
        order: -1;
    }

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

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

@media (max-width: 768px) {
    h1 { font-size: var(--font-size-4xl); }
    h2 { font-size: var(--font-size-3xl); }

    .nav-links {
        display: none;
        position: fixed;
        top: 73px;
        left: 0;
        right: 0;
        background: rgba(255, 255, 255, 0.98);
        backdrop-filter: blur(10px);
        flex-direction: column;
        align-items: stretch;
        gap: 0;
        padding: var(--spacing-4) 0;
        box-shadow: 0 10px 40px rgba(0, 0, 0, 0.15);
        border-bottom: 1px solid var(--color-gray-200);
        max-height: calc(100vh - 73px);
        overflow-y: auto;
    }

    .nav-links.mobile-open {
        display: flex;
    }

    .nav-links a {
        padding: var(--spacing-4) var(--spacing-6);
        border-bottom: 1px solid var(--color-gray-100);
    }

    .nav-links > div {
        position: relative;
        display: block;
    }

    .nav-links #loginBtn {
        width: calc(100% - var(--spacing-12));
        margin: 0 var(--spacing-6);
        justify-content: center;
    }

    .nav-links .dropdown-menu {
        position: static;
        box-shadow: none;
        border: none;
        border-radius: 0;
        background: rgba(37, 99, 235, 0.05);
        margin: var(--spacing-2) var(--spacing-6) 0;
    }

    .nav-links .dropdown-menu.active {
        display: block;
    }

    .mobile-menu-btn {
        display: flex;
    }

    .mobile-menu-btn.active span:nth-child(1) {
        transform: rotate(45deg) translate(6px, 6px);
    }

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

    .mobile-menu-btn.active span:nth-child(3) {
        transform: rotate(-45deg) translate(7px, -7px);
    }

    .mobile-menu-btn span {
        transition: all 0.3s ease;
    }

    .hero-title {
        font-size: var(--font-size-4xl);
    }

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

    .hero-stats {
        grid-template-columns: repeat(3, 1fr);
        gap: var(--spacing-4);
    }

    .problem-solution-grid {
        grid-template-columns: 1fr;
    }

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

    .system-diagram {
        grid-template-columns: 1fr;
    }

    .simple-explanation {
        grid-template-columns: 1fr;
    }

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

    .step-number {
        margin: 0 auto;
    }

    .use-cases-grid {
        grid-template-columns: 1fr;
    }

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

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