/* ==========================================================================
   OBDViz.com Design System & Stylesheet
   ========================================================================== */

/* 1. Core Variables & Design Tokens */
:root {
    --bg-primary: #07080a;
    --bg-secondary: #0f111a;
    --card-bg: rgba(18, 20, 29, 0.65);
    --card-bg-hover: rgba(24, 27, 40, 0.85);
    --border-color: rgba(255, 255, 255, 0.06);
    --border-glow: rgba(0, 242, 254, 0.15);
    
    --text-primary: #f3f4f6;
    --text-secondary: #9ca3af;
    --text-muted: #6b7280;
    
    --accent-cyan: #00f2fe;
    --accent-blue: #0070f3;
    --accent-lime: #39ff14;
    --accent-orange: #f5a623;
    --accent-red: #ff3b30;
    
    --font-sans: 'Outfit', 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    
    --shadow-sm: 0 4px 12px rgba(0, 0, 0, 0.4);
    --shadow-md: 0 12px 32px rgba(0, 0, 0, 0.6);
    --shadow-lg: 0 24px 64px rgba(0, 0, 0, 0.8);
    
    --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-smooth: 0.35s cubic-bezier(0.4, 0, 0.2, 1);
}

/* 2. Base Reset */
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
}

body {
    background-color: var(--bg-primary);
    color: var(--text-primary);
    font-family: var(--font-sans);
    line-height: 1.6;
    overflow-x: hidden;
    background-image: 
        radial-gradient(at 0% 0%, rgba(0, 242, 254, 0.04) 0px, transparent 50%),
        radial-gradient(at 100% 100%, rgba(57, 255, 20, 0.02) 0px, transparent 50%),
        radial-gradient(at 50% 50%, rgba(0, 112, 243, 0.02) 0px, transparent 60%);
    background-attachment: fixed;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

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

/* Scrollbar Styling */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}
::-webkit-scrollbar-track {
    background: var(--bg-primary);
}
::-webkit-scrollbar-thumb {
    background: rgba(255, 255, 255, 0.1);
    border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover {
    background: rgba(0, 242, 254, 0.3);
}

/* 3. Layout Wrapper & Header */
.header-nav {
    position: sticky;
    top: 0;
    z-index: 1000;
    background: rgba(7, 8, 10, 0.75);
    backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--border-color);
    transition: var(--transition-fast);
}

.header-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
    height: 72px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo-link {
    display: flex;
    align-items: center;
    gap: 10px;
}

.logo-circle {
    width: 36px;
    height: 36px;
    background: linear-gradient(135deg, var(--accent-cyan), var(--accent-blue));
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 0 20px rgba(0, 242, 254, 0.3);
    position: relative;
    overflow: hidden;
}

.logo-circle::after {
    content: "";
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: linear-gradient(to bottom right, rgba(255,255,255,0.2) 0%, transparent 80%);
    transform: rotate(30deg);
}

.logo-text {
    font-size: 1.4rem;
    font-weight: 800;
    letter-spacing: 0.5px;
    background: linear-gradient(135deg, #ffffff 30%, var(--text-secondary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.logo-accent {
    color: var(--accent-cyan);
    font-weight: 900;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 32px;
    list-style: none;
}

.nav-item a {
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--text-secondary);
    position: relative;
    padding: 6px 0;
}

.nav-item a:hover {
    color: #fff;
}

.nav-item a::after {
    content: "";
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--accent-cyan);
    transition: var(--transition-fast);
    box-shadow: 0 0 8px var(--accent-cyan);
}

.nav-item a:hover::after {
    width: 100%;
}

.nav-item.active a {
    color: #fff;
}

.nav-item.active a::after {
    width: 100%;
}

.btn-cta {
    background: linear-gradient(135deg, var(--accent-cyan), var(--accent-blue));
    color: #000;
    font-weight: 700;
    padding: 10px 22px;
    border-radius: 8px;
    box-shadow: 0 4px 15px rgba(0, 242, 254, 0.25);
    display: inline-flex;
    align-items: center;
    gap: 8px;
    border: none;
    cursor: pointer;
    font-family: var(--font-sans);
    transition: var(--transition-fast);
}

.btn-cta:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(0, 242, 254, 0.4);
    background: linear-gradient(135deg, #00f2fe, #0056b3);
}

/* Mobile Nav Toggle */
.mobile-toggle {
    display: none;
    background: none;
    border: none;
    color: #fff;
    font-size: 1.5rem;
    cursor: pointer;
}

/* 4. Hero Section */
.hero {
    max-width: 1200px;
    margin: 0 auto;
    padding: 80px 24px;
    display: grid;
    grid-template-columns: 1.1fr 0.9fr;
    gap: 48px;
    align-items: center;
    flex: 1;
}

.hero-content {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.hero-tagline {
    font-size: 0.85rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 2px;
    color: var(--accent-cyan);
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

.hero-tagline::before {
    content: "";
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background-color: var(--accent-lime);
    box-shadow: 0 0 10px var(--accent-lime);
    animation: pulseStatus 2s infinite;
}

.hero-title {
    font-size: 3.5rem;
    line-height: 1.15;
    font-weight: 800;
    letter-spacing: -1px;
}

.gradient-text {
    background: linear-gradient(to right, #ffffff, var(--accent-cyan));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero-desc {
    font-size: 1.15rem;
    color: var(--text-secondary);
}

.hero-actions {
    display: flex;
    gap: 16px;
    margin-top: 8px;
}

.btn-secondary {
    background: rgba(255, 255, 255, 0.04);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    padding: 10px 22px;
    border-radius: 8px;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-weight: 600;
    transition: var(--transition-fast);
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.08);
    border-color: rgba(255, 255, 255, 0.15);
    color: #fff;
    transform: translateY(-2px);
}

.hero-preview {
    position: relative;
    display: flex;
    justify-content: center;
}

.preview-glow {
    position: absolute;
    width: 90%;
    height: 90%;
    background: radial-gradient(circle, rgba(0, 242, 254, 0.15) 0%, transparent 70%);
    top: 5%;
    left: 5%;
    filter: blur(20px);
    z-index: 1;
    pointer-events: none;
}

.preview-card {
    background: var(--card-bg);
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: 16px;
    width: 100%;
    padding: 20px;
    box-shadow: var(--shadow-lg);
    backdrop-filter: blur(12px);
    z-index: 2;
    transition: var(--transition-smooth);
}

.preview-card:hover {
    border-color: var(--border-glow);
    box-shadow: 0 16px 48px rgba(0, 242, 254, 0.12);
}

/* Mock Dashboard Drawing inside Preview */
.mock-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding-bottom: 12px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
    margin-bottom: 16px;
}

.mock-window-dots {
    display: flex;
    gap: 6px;
}

.mock-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.15);
}

.mock-title {
    font-size: 0.75rem;
    color: var(--text-muted);
    font-family: monospace;
}

.mock-gauges {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 12px;
    margin-bottom: 16px;
}

.mock-gauge {
    border: 1px solid rgba(255, 255, 255, 0.04);
    background: rgba(0, 0, 0, 0.2);
    border-radius: 8px;
    padding: 10px;
    text-align: center;
}

.mock-gauge-title {
    font-size: 0.65rem;
    text-transform: uppercase;
    color: var(--text-muted);
}

.mock-gauge-value {
    font-size: 1.1rem;
    font-weight: 700;
    font-family: monospace;
    color: var(--accent-cyan);
    margin: 4px 0;
}

.mock-gauge-bar {
    height: 4px;
    background: rgba(255, 255, 255, 0.05);
    border-radius: 2px;
    overflow: hidden;
}

.mock-gauge-fill {
    height: 100%;
    width: 70%;
    background: linear-gradient(to right, var(--accent-cyan), var(--accent-blue));
}

.mock-chart {
    height: 120px;
    border: 1px solid rgba(255, 255, 255, 0.04);
    background: rgba(0, 0, 0, 0.3);
    border-radius: 8px;
    position: relative;
    overflow: hidden;
}

.mock-chart-svg {
    width: 100%;
    height: 100%;
}

/* 5. Features Section */
.features-section {
    max-width: 1200px;
    margin: 0 auto;
    padding: 60px 24px;
}

.section-header {
    text-align: center;
    max-width: 600px;
    margin: 0 auto 48px auto;
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.section-label {
    font-size: 0.85rem;
    font-weight: 700;
    color: var(--accent-cyan);
    text-transform: uppercase;
    letter-spacing: 1.5px;
}

.section-title {
    font-size: 2.2rem;
    font-weight: 800;
}

.section-desc {
    color: var(--text-secondary);
}

.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: 12px;
    padding: 28px;
    transition: var(--transition-smooth);
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.feature-card:hover {
    border-color: rgba(255, 255, 255, 0.1);
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
}

.feature-icon-box {
    width: 48px;
    height: 48px;
    border-radius: 10px;
    background: rgba(0, 242, 254, 0.08);
    border: 1px solid rgba(0, 242, 254, 0.15);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--accent-cyan);
}

.feature-title {
    font-size: 1.25rem;
    font-weight: 700;
}

.feature-desc {
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.6;
}

/* 6. Step-by-Step Info Section */
.info-section {
    background: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
    border-bottom: 1px solid var(--border-color);
    padding: 80px 24px;
}

.info-container {
    max-width: 1200px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.info-content {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.steps-list {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.step-item {
    display: flex;
    gap: 16px;
}

.step-number {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background: rgba(0, 242, 254, 0.1);
    border: 1px solid var(--accent-cyan);
    color: var(--accent-cyan);
    font-weight: 700;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    font-size: 0.9rem;
}

.step-details {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.step-title {
    font-weight: 600;
    font-size: 1.05rem;
}

.step-desc {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.info-visual {
    background: rgba(0, 0, 0, 0.4);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 24px;
    font-family: monospace;
    font-size: 0.85rem;
    color: var(--text-secondary);
    box-shadow: var(--shadow-md);
}

.code-header {
    display: flex;
    justify-content: space-between;
    margin-bottom: 12px;
    padding-bottom: 8px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
    color: var(--text-muted);
}

.code-content {
    line-height: 1.5;
}

.code-highlight {
    color: var(--accent-cyan);
}

/* 7. FAQ Accordion Pages */
.faq-container {
    max-width: 800px;
    margin: 40px auto 80px auto;
    padding: 0 24px;
}

.faq-list {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.faq-card {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    overflow: hidden;
    transition: var(--transition-smooth);
}

.faq-card:hover {
    border-color: rgba(255, 255, 255, 0.1);
}

.faq-question-btn {
    width: 100%;
    background: none;
    border: none;
    padding: 20px 24px;
    text-align: left;
    color: #fff;
    font-size: 1.05rem;
    font-weight: 600;
    display: flex;
    justify-content: space-between;
    align-items: center;
    cursor: pointer;
    outline: none;
    font-family: var(--font-sans);
}

.faq-icon {
    font-size: 1.25rem;
    color: var(--accent-cyan);
    transition: var(--transition-fast);
}

.faq-card.open .faq-icon {
    transform: rotate(45deg);
}

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

.faq-answer-inner {
    padding: 0 24px 20px 24px;
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.6;
}

.faq-answer-inner p {
    margin-bottom: 12px;
}

.faq-answer-inner p:last-child {
    margin-bottom: 0;
}

/* 8. Text Layout Pages (About, Policies) */
.page-header {
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    padding: 60px 24px;
    text-align: center;
}

.page-title {
    font-size: 2.8rem;
    font-weight: 800;
    margin-bottom: 12px;
}

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

.text-container {
    max-width: 800px;
    margin: 40px auto 80px auto;
    padding: 0 24px;
}

.rich-text {
    color: var(--text-secondary);
    line-height: 1.7;
}

.rich-text h2 {
    color: #fff;
    font-size: 1.5rem;
    margin: 32px 0 16px 0;
    font-weight: 700;
}

.rich-text p {
    margin-bottom: 20px;
}

.rich-text ul {
    margin-bottom: 20px;
    padding-left: 20px;
}

.rich-text li {
    margin-bottom: 8px;
}

/* About / Contact Grid */
.about-grid {
    display: grid;
    grid-template-columns: 1.1fr 0.9fr;
    gap: 40px;
    align-items: start;
}

.contact-card {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 24px;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 8px;
    margin-bottom: 16px;
}

.form-label {
    font-size: 0.85rem;
    font-weight: 600;
    text-transform: uppercase;
    color: var(--text-secondary);
}

.form-input, .form-textarea {
    background: rgba(0, 0, 0, 0.25);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    color: #fff;
    padding: 10px 14px;
    font-family: var(--font-sans);
    font-size: 0.95rem;
    outline: none;
    transition: var(--transition-fast);
}

.form-input:focus, .form-textarea:focus {
    border-color: var(--accent-cyan);
    box-shadow: 0 0 10px rgba(0, 242, 254, 0.15);
}

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

/* 9. Cookie Consent Banner */
.cookie-banner {
    position: fixed;
    bottom: 24px;
    right: 24px;
    max-width: 420px;
    background: rgba(15, 17, 26, 0.9);
    backdrop-filter: blur(20px);
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: 12px;
    padding: 24px;
    box-shadow: var(--shadow-lg);
    z-index: 9999;
    display: flex;
    flex-direction: column;
    gap: 16px;
    transform: translateY(120px);
    opacity: 0;
    transition: transform 0.5s cubic-bezier(0.16, 1, 0.3, 1), opacity 0.5s ease-out;
}

.cookie-banner.show {
    transform: translateY(0);
    opacity: 1;
}

.cookie-header {
    display: flex;
    align-items: center;
    gap: 10px;
}

.cookie-title {
    font-size: 1.1rem;
    font-weight: 700;
}

.cookie-desc {
    font-size: 0.85rem;
    color: var(--text-secondary);
    line-height: 1.5;
}

.cookie-actions {
    display: flex;
    gap: 12px;
    justify-content: flex-end;
}

.cookie-btn-accept {
    background: linear-gradient(135deg, var(--accent-cyan), var(--accent-blue));
    color: #000;
    border: none;
    font-weight: 700;
    padding: 8px 16px;
    border-radius: 6px;
    font-size: 0.85rem;
    cursor: pointer;
    font-family: var(--font-sans);
    transition: var(--transition-fast);
}

.cookie-btn-accept:hover {
    box-shadow: 0 0 10px rgba(0, 242, 254, 0.4);
    transform: translateY(-1px);
}

.cookie-btn-deny {
    background: transparent;
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    font-weight: 600;
    padding: 8px 16px;
    border-radius: 6px;
    font-size: 0.85rem;
    cursor: pointer;
    font-family: var(--font-sans);
    transition: var(--transition-fast);
}

.cookie-btn-deny:hover {
    background: rgba(255, 255, 255, 0.05);
    color: #fff;
}

/* 10. Site Footer */
.site-footer {
    background: #040507;
    border-top: 1px solid var(--border-color);
    padding: 60px 24px 30px 24px;
    margin-top: auto;
}

.footer-container {
    max-width: 1200px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 1.5fr repeat(3, 1fr);
    gap: 40px;
    margin-bottom: 40px;
}

.footer-info {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: 8px;
}

.footer-desc {
    color: var(--text-secondary);
    font-size: 0.9rem;
    max-width: 320px;
}

.footer-col {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.footer-col-title {
    font-size: 0.85rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--accent-cyan);
}

.footer-links {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 10px;
    font-size: 0.9rem;
}

.footer-links a {
    color: var(--text-secondary);
}

.footer-links a:hover {
    color: #fff;
    padding-left: 4px;
}

.footer-bottom {
    max-width: 1200px;
    margin: 0 auto;
    padding-top: 24px;
    border-top: 1px solid rgba(255, 255, 255, 0.03);
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.8rem;
    color: var(--text-muted);
}

/* Animations */
@keyframes pulseStatus {
    0% {
        box-shadow: 0 0 0 0 rgba(57, 255, 20, 0.5);
    }
    70% {
        box-shadow: 0 0 0 8px rgba(57, 255, 20, 0);
    }
    100% {
        box-shadow: 0 0 0 0 rgba(57, 255, 20, 0);
    }
}

/* Responsive CSS */
@media (max-width: 1024px) {
    .hero {
        grid-template-columns: 1fr;
        text-align: center;
        padding: 60px 24px;
    }
    .hero-tagline {
        justify-content: center;
    }
    .hero-actions {
        justify-content: center;
    }
    .features-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    .info-container {
        grid-template-columns: 1fr;
        gap: 40px;
    }
    .footer-container {
        grid-template-columns: 1fr repeat(3, 1fr);
    }
}

@media (max-width: 768px) {
    .header-nav {
        padding: 0;
    }
    .nav-links {
        display: none; /* Mobile Drawer Logic goes here */
    }
    .btn-cta-nav {
        display: none;
    }
    .mobile-toggle {
        display: block;
    }
    .hero-title {
        font-size: 2.8rem;
    }
    .features-grid {
        grid-template-columns: 1fr;
    }
    .about-grid {
        grid-template-columns: 1fr;
    }
    .footer-container {
        grid-template-columns: 1fr;
        gap: 30px;
        text-align: center;
    }
    .footer-info {
        align-items: center;
    }
    .footer-logo {
        justify-content: center;
    }
    .footer-bottom {
        flex-direction: column;
        gap: 12px;
        text-align: center;
    }
    .cookie-banner {
        left: 16px;
        right: 16px;
        bottom: 16px;
        max-width: none;
    }
}