/* ============================================
   Dunit Landing Page — Production CSS
   ============================================ */

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

:root {
    --color-primary: #2AABEE;
    --color-primary-dark: #229ED9;
    --color-primary-light: #e8f5fd;
    --color-text: #1a1a2e;
    --color-text-secondary: #555770;
    --color-bg: #ffffff;
    --color-bg-alt: #f7f8fc;
    --color-border: #e2e4ed;
    --color-success: #34c759;
    --color-premium: #ff9500;
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --container-max: 1120px;
    --radius: 12px;
    --radius-lg: 20px;
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.06);
    --shadow-md: 0 4px 16px rgba(0,0,0,0.08);
    --shadow-lg: 0 8px 32px rgba(0,0,0,0.12);
    --shadow-xl: 0 16px 48px rgba(0,0,0,0.14);
    --transition: 0.2s ease;
}

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

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

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

a:hover {
    color: var(--color-primary-dark);
}

code {
    background: var(--color-primary-light);
    color: var(--color-primary-dark);
    padding: 2px 8px;
    border-radius: 6px;
    font-size: 0.9em;
    font-family: 'SF Mono', 'Fira Code', 'Consolas', monospace;
    font-weight: 500;
}

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

/* --- Container --- */
.container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 24px;
}

/* --- Navigation --- */
.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.92);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid transparent;
    transition: border-color var(--transition), box-shadow var(--transition);
}

.nav.scrolled {
    border-bottom-color: var(--color-border);
    box-shadow: var(--shadow-sm);
}

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

.nav-logo {
    display: flex;
    align-items: center;
    gap: 8px;
    color: var(--color-text);
    font-weight: 700;
    font-size: 1.2rem;
}

.nav-logo:hover {
    color: var(--color-text);
}

.nav-logo-img {
    border-radius: 6px;
    flex-shrink: 0;
}

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

.nav-links a {
    color: var(--color-text-secondary);
    font-size: 0.95rem;
    font-weight: 500;
    transition: color var(--transition);
}

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

.btn-nav {
    display: inline-flex;
}

.nav-toggle {
    display: none;
    flex-direction: column;
    justify-content: center;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
}

.nav-toggle span {
    display: block;
    width: 22px;
    height: 2px;
    background: var(--color-text);
    border-radius: 2px;
    transition: transform var(--transition), opacity var(--transition);
}

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

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

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

/* Mobile Menu */
.mobile-menu {
    display: none;
    position: fixed;
    top: 64px;
    left: 0;
    right: 0;
    background: var(--color-bg);
    border-bottom: 1px solid var(--color-border);
    padding: 16px 24px 24px;
    z-index: 999;
    flex-direction: column;
    gap: 12px;
    box-shadow: var(--shadow-md);
}

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

.mobile-menu a {
    color: var(--color-text-secondary);
    font-size: 1rem;
    font-weight: 500;
    padding: 8px 0;
}

.mobile-menu a:hover {
    color: var(--color-text);
}

/* --- Buttons --- */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 10px 20px;
    border-radius: 10px;
    font-family: var(--font-family);
    font-size: 0.95rem;
    font-weight: 600;
    border: 2px solid transparent;
    cursor: pointer;
    transition: all var(--transition);
    white-space: nowrap;
}

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

.btn-primary:hover {
    background: var(--color-primary-dark);
    border-color: var(--color-primary-dark);
    color: #fff;
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(42, 171, 238, 0.35);
}

.btn-outline {
    background: transparent;
    color: var(--color-text);
    border-color: var(--color-border);
}

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

.btn-ghost {
    background: transparent;
    color: var(--color-text-secondary);
    border-color: transparent;
}

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

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

.btn-white:hover {
    background: #f0f8ff;
    color: var(--color-primary-dark);
    transform: translateY(-1px);
    box-shadow: 0 4px 16px rgba(255,255,255,0.3);
}

.btn-lg {
    padding: 14px 28px;
    font-size: 1.05rem;
    border-radius: 12px;
}

.btn-block {
    width: 100%;
}

.btn-icon {
    width: 20px;
    height: 20px;
}

/* --- Hero --- */
.hero {
    padding: 120px 0 80px;
    overflow: hidden;
}

.hero-inner {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 64px;
    align-items: center;
}

.hero-badge {
    display: inline-block;
    background: var(--color-primary-light);
    color: var(--color-primary-dark);
    padding: 6px 16px;
    border-radius: 100px;
    font-size: 0.85rem;
    font-weight: 600;
    margin-bottom: 20px;
}

.hero h1 {
    font-size: 3.2rem;
    font-weight: 800;
    line-height: 1.15;
    letter-spacing: -0.03em;
    margin-bottom: 20px;
}

.gradient-text {
    background: linear-gradient(135deg, var(--color-primary), #6366f1);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 1.15rem;
    color: var(--color-text-secondary);
    line-height: 1.7;
    margin-bottom: 32px;
    max-width: 520px;
}

.hero-cta {
    display: flex;
    gap: 12px;
    margin-bottom: 40px;
    flex-wrap: wrap;
}

.hero-stats {
    display: flex;
    align-items: center;
    gap: 24px;
}

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

.hero-stat-number {
    font-size: 1.8rem;
    font-weight: 800;
    color: var(--color-text);
    line-height: 1;
}

.hero-stat-label {
    font-size: 0.82rem;
    color: var(--color-text-secondary);
    margin-top: 4px;
    font-weight: 500;
}

.hero-stat-divider {
    width: 1px;
    height: 40px;
    background: var(--color-border);
}

/* --- Chat Mockup --- */
.chat-mockup {
    background: #ffffff;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-xl);
    overflow: hidden;
    border: 1px solid var(--color-border);
    max-width: 400px;
    margin-left: auto;
    transform: perspective(800px) rotateY(-2deg);
    transition: transform 0.4s ease;
}

.chat-mockup:hover {
    transform: perspective(800px) rotateY(0deg);
}

.chat-header {
    background: var(--color-primary);
    color: #fff;
    padding: 12px 16px;
    display: flex;
    align-items: center;
    gap: 12px;
}

.chat-header-avatar {
    width: 36px;
    height: 36px;
    background: rgba(255,255,255,0.25);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 0.9rem;
}

.chat-header-name {
    font-weight: 600;
    font-size: 0.95rem;
}

.chat-header-status {
    font-size: 0.78rem;
    opacity: 0.85;
}

.chat-body {
    padding: 16px;
    background: #e8e5de;
    display: flex;
    flex-direction: column;
    gap: 10px;
    min-height: 300px;
}

.chat-msg {
    max-width: 85%;
}

.chat-msg-other {
    align-self: flex-start;
}

.chat-msg-self {
    align-self: flex-end;
}

.chat-msg-name {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--color-primary-dark);
    margin-bottom: 2px;
}

.chat-msg-text {
    background: #fff;
    padding: 8px 12px;
    border-radius: 12px;
    font-size: 0.88rem;
    line-height: 1.5;
    box-shadow: 0 1px 2px rgba(0,0,0,0.06);
}

.chat-msg-self .chat-msg-text {
    background: #dcf8c6;
}

.chat-msg-inline {
    padding: 0;
    overflow: hidden;
}

.chat-msg-inline-tag {
    background: rgba(0,0,0,0.04);
    padding: 4px 12px;
    font-size: 0.72rem;
    color: var(--color-text-secondary);
    font-weight: 500;
}

.chat-checklist {
    padding: 10px 12px;
}

.chat-checklist-title {
    font-weight: 700;
    font-size: 0.9rem;
    margin-bottom: 8px;
}

.chat-item {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 3px 0;
    font-size: 0.85rem;
}

.chat-item-icon {
    font-size: 0.9rem;
    flex-shrink: 0;
}

.chat-item-text.checked {
    text-decoration: line-through;
    color: var(--color-text-secondary);
}

.chat-item-who {
    font-size: 0.72rem;
    color: var(--color-primary);
    margin-left: auto;
    flex-shrink: 0;
}

.chat-checklist-progress {
    margin-top: 8px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.chat-progress-bar {
    flex: 1;
    height: 4px;
    background: #e0e0e0;
    border-radius: 4px;
    overflow: hidden;
}

.chat-progress-fill {
    height: 100%;
    background: var(--color-success);
    border-radius: 4px;
    transition: width 0.5s ease;
}

.chat-progress-text {
    font-size: 0.72rem;
    color: var(--color-text-secondary);
    white-space: nowrap;
}

.chat-input {
    background: #f0f0f0;
    padding: 10px 16px;
    border-top: 1px solid #ddd;
}

.chat-input-text {
    font-size: 0.85rem;
    color: #999;
}

/* --- Sections --- */
.section {
    padding: 80px 0;
}

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

.section-header {
    text-align: center;
    max-width: 640px;
    margin: 0 auto 56px;
}

.section-header h2 {
    font-size: 2.2rem;
    font-weight: 800;
    letter-spacing: -0.02em;
    margin-bottom: 12px;
    line-height: 1.2;
}

.section-header p {
    font-size: 1.1rem;
    color: var(--color-text-secondary);
    line-height: 1.6;
}

/* --- Steps --- */
.steps {
    max-width: 600px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 0;
}

.step {
    display: flex;
    gap: 20px;
    align-items: flex-start;
    padding: 24px;
    background: var(--color-bg);
    border-radius: var(--radius);
    border: 1px solid var(--color-border);
    box-shadow: var(--shadow-sm);
}

.step-number {
    width: 44px;
    height: 44px;
    background: var(--color-primary);
    color: #fff;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 800;
    font-size: 1.1rem;
    flex-shrink: 0;
}

.step-content h3 {
    font-size: 1.1rem;
    font-weight: 700;
    margin-bottom: 6px;
}

.step-content p {
    font-size: 0.95rem;
    color: var(--color-text-secondary);
    line-height: 1.5;
}

.step-example {
    margin-top: 10px;
    padding: 10px 14px;
    background: var(--color-bg-alt);
    border-radius: 8px;
    border: 1px solid var(--color-border);
}

.step-example code {
    background: none;
    padding: 0;
    font-size: 0.88rem;
}

.step-arrow {
    text-align: center;
    font-size: 1.4rem;
    color: var(--color-primary);
    padding: 4px 0;
}

/* --- Demo Placeholder --- */
.demo-placeholder {
    max-width: 640px;
    margin: 48px auto 0;
    border: 2px dashed var(--color-border);
    border-radius: var(--radius-lg);
    padding: 48px;
    text-align: center;
}

.demo-placeholder-icon {
    font-size: 2.5rem;
    margin-bottom: 8px;
}

.demo-placeholder p {
    color: var(--color-text-secondary);
    font-size: 0.95rem;
}

/* --- Use Cases --- */
.use-cases-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.use-case {
    padding: 28px;
    border-radius: var(--radius);
    border: 1px solid var(--color-border);
    background: var(--color-bg);
    transition: transform var(--transition), box-shadow var(--transition);
}

.use-case:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
}

.use-case-icon {
    font-size: 2rem;
    margin-bottom: 12px;
}

.use-case h3 {
    font-size: 1.05rem;
    font-weight: 700;
    margin-bottom: 8px;
}

.use-case p {
    font-size: 0.9rem;
    color: var(--color-text-secondary);
    line-height: 1.6;
}

/* --- Features --- */
.features-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
}

.feature {
    padding: 28px;
    border-radius: var(--radius);
    border: 1px solid var(--color-border);
    background: var(--color-bg);
    position: relative;
    transition: transform var(--transition), box-shadow var(--transition);
}

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

.feature-icon {
    font-size: 1.8rem;
    margin-bottom: 14px;
}

.feature h3 {
    font-size: 1rem;
    font-weight: 700;
    margin-bottom: 8px;
}

.feature p {
    font-size: 0.88rem;
    color: var(--color-text-secondary);
    line-height: 1.6;
}

.feature-premium {
    border-color: #ffe0b2;
    background: linear-gradient(180deg, #fff9f0 0%, #fff 100%);
}

.feature-badge {
    position: absolute;
    top: 12px;
    right: 12px;
    background: var(--color-premium);
    color: #fff;
    font-size: 0.7rem;
    font-weight: 700;
    padding: 3px 10px;
    border-radius: 100px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

/* --- Pricing --- */
.pricing-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 24px;
    max-width: 780px;
    margin: 0 auto 48px;
}

.pricing-card {
    padding: 36px;
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-border);
    background: var(--color-bg);
    position: relative;
}

.pricing-card-featured {
    border-color: var(--color-primary);
    border-width: 2px;
    box-shadow: 0 8px 32px rgba(42, 171, 238, 0.15);
}

.pricing-card-popular {
    position: absolute;
    top: -13px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--color-primary);
    color: #fff;
    padding: 4px 20px;
    border-radius: 100px;
    font-size: 0.8rem;
    font-weight: 700;
    white-space: nowrap;
}

.pricing-card-header {
    margin-bottom: 28px;
}

.pricing-subtext {
    font-size: 0.9rem;
    color: var(--color-text-secondary);
    margin-top: 4px;
}

.pricing-amount-text {
    font-size: 2.4rem;
}

.pricing-card-header h3 {
    font-size: 1.3rem;
    font-weight: 700;
    margin-bottom: 8px;
}

.pricing-price {
    display: flex;
    align-items: baseline;
    gap: 4px;
}

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

.pricing-amount {
    font-size: 3rem;
    font-weight: 800;
    line-height: 1;
    letter-spacing: -0.03em;
}

.pricing-period {
    font-size: 1rem;
    color: var(--color-text-secondary);
}

.pricing-features {
    list-style: none;
    margin-bottom: 28px;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.pricing-feature {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 0.93rem;
}

.pricing-check {
    color: var(--color-success);
    font-weight: 700;
    font-size: 1rem;
    flex-shrink: 0;
}

.pricing-check.featured {
    color: var(--color-primary);
}

.pricing-x {
    color: #ccc;
    font-weight: 700;
    font-size: 1.1rem;
    flex-shrink: 0;
}

.pricing-feature-disabled {
    color: var(--color-text-secondary);
    opacity: 0.7;
}

.pricing-note {
    text-align: center;
    font-size: 0.82rem;
    color: var(--color-text-secondary);
    margin-top: 12px;
}

/* Pricing Tiers */
.pricing-tiers {
    max-width: 780px;
    margin: 0 auto;
    text-align: center;
}

.pricing-tiers h4 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 16px;
    color: var(--color-text-secondary);
}

.pricing-tiers-table {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.pricing-tier {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 12px 20px;
    background: var(--color-bg-alt);
    border-radius: 10px;
    font-size: 0.9rem;
}

.pricing-tier-label {
    font-weight: 700;
    min-width: 50px;
    color: var(--color-primary-dark);
}

.pricing-tier-countries {
    color: var(--color-text-secondary);
    flex: 1;
    text-align: left;
}

.pricing-tier-price {
    font-weight: 600;
    white-space: nowrap;
}

.pricing-tiers-note {
    font-size: 0.85rem;
    color: var(--color-text-secondary);
    margin-top: 16px;
}

.pricing-info {
    display: flex;
    justify-content: center;
    gap: 32px;
    flex-wrap: wrap;
}

.pricing-info-item {
    font-size: 0.88rem;
    color: var(--color-text-secondary);
    text-align: center;
    padding: 12px 20px;
    background: var(--color-bg-alt);
    border-radius: 10px;
    border: 1px solid var(--color-border);
}

.pricing-info-item strong {
    color: var(--color-text);
}

/* --- Referral Banner --- */
.referral-banner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 40px;
    padding: 48px;
    background: linear-gradient(135deg, #e8f5fd 0%, #f0e6ff 100%);
    border-radius: var(--radius-lg);
    border: 1px solid #d4e8f7;
}

.referral-content h2 {
    font-size: 1.6rem;
    font-weight: 800;
    margin-bottom: 8px;
}

.referral-content p {
    color: var(--color-text-secondary);
    font-size: 0.95rem;
    line-height: 1.6;
    max-width: 520px;
}

/* --- FAQ --- */
.faq-list {
    max-width: 700px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.faq-item {
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    overflow: hidden;
    background: var(--color-bg);
    transition: box-shadow var(--transition);
}

.faq-item:hover {
    box-shadow: var(--shadow-sm);
}

.faq-question {
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 18px 20px;
    background: none;
    border: none;
    cursor: pointer;
    font-family: var(--font-family);
    font-size: 1rem;
    font-weight: 600;
    color: var(--color-text);
    text-align: left;
    gap: 12px;
}

.faq-icon {
    font-size: 1.4rem;
    color: var(--color-primary);
    flex-shrink: 0;
    transition: transform 0.3s ease;
    line-height: 1;
    font-weight: 300;
}

.faq-item.active .faq-icon {
    transform: rotate(45deg);
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.35s ease, padding 0.35s ease;
}

.faq-item.active .faq-answer {
    max-height: 300px;
}

.faq-answer p {
    padding: 0 20px 18px;
    font-size: 0.93rem;
    color: var(--color-text-secondary);
    line-height: 1.7;
}

/* --- CTA Section --- */
.section-cta {
    background: linear-gradient(135deg, var(--color-primary) 0%, #6366f1 100%);
    color: #fff;
    text-align: center;
    padding: 80px 0;
}

.cta-content h2 {
    font-size: 2.4rem;
    font-weight: 800;
    margin-bottom: 12px;
    letter-spacing: -0.02em;
}

.cta-content p {
    font-size: 1.15rem;
    opacity: 0.9;
    margin-bottom: 32px;
}

.cta-content code {
    background: rgba(255,255,255,0.2);
    color: #fff;
}

/* --- Footer --- */
.footer {
    padding: 56px 0 32px;
    border-top: 1px solid var(--color-border);
    background: var(--color-bg-alt);
}

.footer-top {
    display: flex;
    justify-content: space-between;
    gap: 64px;
    padding-bottom: 32px;
}

.footer-brand {
    display: flex;
    flex-direction: column;
    gap: 8px;
    max-width: 320px;
}

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

.footer-brand-name .nav-logo-img {
    border-radius: 8px;
}

.footer-brand-name .nav-logo-text {
    font-weight: 700;
    font-size: 1.2rem;
}

.footer-tagline {
    color: var(--color-text-secondary);
    font-size: 0.9rem;
    line-height: 1.6;
}

.footer-links {
    display: flex;
    gap: 64px;
}

.footer-col {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.footer-col h4 {
    font-size: 0.85rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--color-text);
    margin-bottom: 4px;
}

.footer-col a {
    color: var(--color-text-secondary);
    font-size: 0.9rem;
}

.footer-col a:hover {
    color: var(--color-primary);
}

.footer-support-link {
    display: flex;
    align-items: center;
    gap: 6px;
}

.footer-support-icon {
    border-radius: 4px;
    flex-shrink: 0;
}

.footer-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: 24px;
    border-top: 1px solid var(--color-border);
}

.footer-bottom p {
    font-size: 0.85rem;
    color: var(--color-text-secondary);
}

/* ============================================
   Theme Toggle & Nav Actions
   ============================================ */
.nav-actions {
    display: flex;
    align-items: center;
    gap: 8px;
}

.theme-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    border-radius: 50%;
    border: 1px solid var(--color-border);
    background: var(--color-bg);
    cursor: pointer;
    padding: 0;
    transition: border-color var(--transition), background var(--transition);
    flex-shrink: 0;
    color: var(--color-text-secondary);
}

.theme-toggle:hover {
    border-color: var(--color-primary);
    background: var(--color-primary-light);
    color: var(--color-primary);
}

.theme-toggle svg {
    width: 18px;
    height: 18px;
    display: block;
}

/* ============================================
   Dark Mode
   ============================================ */
html[data-theme="dark"] {
    color-scheme: dark;

    --color-primary: #3fb8f2;
    --color-primary-dark: #5ac4f5;
    --color-primary-light: rgba(42, 171, 238, 0.15);
    --color-text: #e8eaed;
    --color-text-secondary: #9aa0a6;
    --color-bg: #1a1a2e;
    --color-bg-alt: #16162a;
    --color-border: #2d2d4a;
    --color-success: #34c759;
    --color-premium: #ff9f0a;
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.25);
    --shadow-md: 0 4px 16px rgba(0,0,0,0.35);
    --shadow-lg: 0 8px 32px rgba(0,0,0,0.45);
    --shadow-xl: 0 16px 48px rgba(0,0,0,0.5);
}

/* Navigation */
html[data-theme="dark"] .nav {
    background: rgba(26, 26, 46, 0.92);
}

/* Buttons */
html[data-theme="dark"] .btn-outline {
    color: var(--color-text);
    border-color: var(--color-border);
}

html[data-theme="dark"] .btn-outline:hover {
    background: var(--color-primary-light);
}

html[data-theme="dark"] .btn-white {
    background: rgba(255, 255, 255, 0.12);
    color: #fff;
    border-color: rgba(255, 255, 255, 0.2);
}

html[data-theme="dark"] .btn-white:hover {
    background: rgba(255, 255, 255, 0.2);
    color: #fff;
    box-shadow: 0 4px 16px rgba(255,255,255,0.1);
}

/* Chat Mockup */
html[data-theme="dark"] .chat-mockup {
    background: #1e1e32;
    border-color: var(--color-border);
}

html[data-theme="dark"] .chat-header {
    background: #1e88c7;
}

html[data-theme="dark"] .chat-body {
    background: #0e0e1e;
}

html[data-theme="dark"] .chat-msg-text {
    background: #2a2a44;
    color: var(--color-text);
    box-shadow: 0 1px 2px rgba(0,0,0,0.2);
}

html[data-theme="dark"] .chat-msg-self .chat-msg-text {
    background: #1a3a28;
}

html[data-theme="dark"] .chat-msg-inline-tag {
    background: rgba(255,255,255,0.06);
    color: var(--color-text-secondary);
}

html[data-theme="dark"] .chat-checklist-title {
    color: var(--color-text);
}

html[data-theme="dark"] .chat-item {
    color: var(--color-text);
}

html[data-theme="dark"] .chat-progress-bar {
    background: #3a3a54;
}

html[data-theme="dark"] .chat-input {
    background: #16162a;
    border-top-color: var(--color-border);
}

html[data-theme="dark"] .chat-input-text {
    color: #666;
}

/* Step example */
html[data-theme="dark"] .step-example code {
    color: var(--color-primary);
}

/* Feature premium card */
html[data-theme="dark"] .feature-premium {
    border-color: rgba(255, 149, 0, 0.3);
    background: linear-gradient(180deg, #2a2218 0%, #1a1a2e 100%);
}

/* Pricing */
html[data-theme="dark"] .pricing-card-featured {
    box-shadow: 0 8px 32px rgba(42, 171, 238, 0.2);
}

html[data-theme="dark"] .pricing-x {
    color: #555;
}

/* Referral banner */
html[data-theme="dark"] .referral-banner {
    background: linear-gradient(135deg, rgba(42, 171, 238, 0.12) 0%, rgba(99, 102, 241, 0.12) 100%);
    border-color: var(--color-border);
}

/* CTA section */
html[data-theme="dark"] .section-cta {
    background: linear-gradient(135deg, #1e6fa0 0%, #4a4cc7 100%);
}

html[data-theme="dark"] .cta-content code {
    background: rgba(255,255,255,0.15);
}

/* Code inline */
html[data-theme="dark"] code {
    background: var(--color-primary-light);
    color: var(--color-primary);
}

/* Logo images — lighten slightly for dark bg */
html[data-theme="dark"] .nav-logo-img,
html[data-theme="dark"] .footer-support-icon {
    filter: brightness(1.1);
}

/* Gradient text — slightly brighter for dark */
html[data-theme="dark"] .gradient-text {
    background: linear-gradient(135deg, var(--color-primary), #818cf8);
    -webkit-background-clip: text;
    background-clip: text;
}

/* ============================================
   Responsive
   ============================================ */
@media (max-width: 1024px) {
    .hero h1 {
        font-size: 2.6rem;
    }

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

@media (max-width: 768px) {
    .nav-links {
        display: none;
    }

    .nav-actions .btn-nav {
        display: none;
    }

    .nav-toggle {
        display: flex;
    }

    .hero {
        padding: 100px 0 60px;
    }

    .hero-inner {
        grid-template-columns: 1fr;
        gap: 40px;
    }

    .hero h1 {
        font-size: 2.2rem;
    }

    .hero-subtitle {
        font-size: 1rem;
    }

    .hero-visual {
        display: flex;
        justify-content: center;
    }

    .chat-mockup {
        max-width: 340px;
        margin: 0 auto;
        transform: none;
    }

    .chat-mockup:hover {
        transform: none;
    }

    .section {
        padding: 60px 0;
    }

    .section-header h2 {
        font-size: 1.7rem;
    }

    .use-cases-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 16px;
    }

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

    .pricing-grid {
        grid-template-columns: 1fr;
        max-width: 400px;
    }

    .referral-banner {
        flex-direction: column;
        text-align: center;
        padding: 32px;
    }

    .referral-content p {
        max-width: 100%;
    }

    .cta-content h2 {
        font-size: 1.8rem;
    }

    .footer-top {
        flex-direction: column;
        gap: 32px;
    }

    .footer-links {
        gap: 40px;
    }

    .footer-bottom {
        flex-direction: column;
        gap: 8px;
        text-align: center;
    }
}

@media (max-width: 480px) {
    .hero h1 {
        font-size: 1.85rem;
    }

    .hero-stats {
        gap: 16px;
    }

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

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

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

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

    .pricing-amount {
        font-size: 2.4rem;
    }

    .step {
        flex-direction: column;
        gap: 12px;
    }
}

/* --- Animations --- */
.fade-in {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.5s ease, transform 0.5s ease;
}

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

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
    html {
        scroll-behavior: auto;
    }

    .fade-in {
        opacity: 1;
        transform: none;
        transition: none;
    }

    .chat-mockup,
    .use-case,
    .feature,
    .btn-primary {
        transition: none;
    }

    .chat-mockup:hover,
    .use-case:hover,
    .feature:hover {
        transform: none;
    }
}