:root {
    --landing-primary: #0ea5e9;
    --landing-primary-dark: #0284c7;
    --landing-accent: #06b6d4;
    --landing-dark: #0f172a;
    --landing-muted: #64748b;
    --landing-bg: #f8fafc;
    --landing-card: #ffffff;
    --landing-gradient: linear-gradient(135deg, #0ea5e9 0%, #2563eb 50%, #06b6d4 100%);
    --landing-shadow: 0 20px 50px rgba(15, 23, 42, 0.12);
    --landing-radius: 16px;
    --landing-transition: 0.25s ease;
}

html {
    scroll-behavior: smooth;
}

body.landing-page {
    font-family: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    color: var(--landing-dark);
    background: #fff;
}

.landing-header {
    position: sticky;
    top: 0;
    z-index: 1030;
    background: rgba(255, 255, 255, 0.92);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid rgba(148, 163, 184, 0.2);
}

.landing-nav .nav-link {
    color: var(--landing-muted);
    font-weight: 500;
    font-size: 0.95rem;
    padding: 0.5rem 0.85rem !important;
    transition: color var(--landing-transition);
}

.landing-nav .nav-link:hover {
    color: var(--landing-primary);
}

.landing-brand {
    display: inline-flex;
    align-items: center;
    height: 36px;
    text-decoration: none;
    border-radius: 8px;
    overflow: hidden;
    line-height: 0;
}

.landing-brand:hover {
    opacity: 0.92;
}

.landing-brand__logo {
    display: block;
    height: 36px;
    width: auto;
    max-width: 120px;
    object-fit: contain;
}

.landing-brand__icon {
    width: 36px;
    height: 36px;
    border-radius: 10px;
    background: var(--landing-gradient);
    color: #fff;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 1rem;
}

/* Hero */
.landing-hero {
    padding: 4rem 0 5rem;
    background: radial-gradient(ellipse at 20% 0%, rgba(14, 165, 233, 0.12) 0%, transparent 55%),
        radial-gradient(ellipse at 80% 20%, rgba(37, 99, 235, 0.08) 0%, transparent 50%),
        var(--landing-bg);
    overflow: hidden;
}

.landing-hero__badge {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    padding: 0.35rem 0.85rem;
    border-radius: 999px;
    background: rgba(14, 165, 233, 0.1);
    color: var(--landing-primary-dark);
    font-size: 0.8rem;
    font-weight: 600;
    margin-bottom: 1.25rem;
}

.landing-hero__title {
    font-size: clamp(1.85rem, 4vw, 2.75rem);
    font-weight: 800;
    line-height: 1.2;
    letter-spacing: -0.02em;
    margin-bottom: 1.25rem;
}

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

.landing-hero__subtitle {
    font-size: 1.05rem;
    color: var(--landing-muted);
    line-height: 1.7;
    max-width: 540px;
    margin-bottom: 2rem;
}

.landing-hero__cta .btn {
    padding: 0.65rem 1.5rem;
    font-weight: 600;
    border-radius: 10px;
}

.landing-hero__cta .btn-primary {
    background: var(--landing-gradient);
    border: none;
    box-shadow: 0 8px 24px rgba(14, 165, 233, 0.35);
}

.landing-hero__cta .btn-primary:hover {
    filter: brightness(1.05);
    transform: translateY(-1px);
}

.landing-hero__stats {
    display: flex;
    flex-wrap: wrap;
    gap: 1.5rem;
    margin-top: 2.5rem;
    padding-top: 2rem;
    border-top: 1px solid rgba(148, 163, 184, 0.25);
}

.landing-hero__stat strong {
    display: block;
    font-size: 1.35rem;
    color: var(--landing-primary-dark);
}

.landing-hero__stat span {
    font-size: 0.85rem;
    color: var(--landing-muted);
}

/* Mockup */
.landing-mockup {
    border-radius: var(--landing-radius);
    background: var(--landing-card);
    box-shadow: var(--landing-shadow);
    border: 1px solid rgba(148, 163, 184, 0.2);
    overflow: hidden;
    transform: perspective(1200px) rotateY(-4deg) rotateX(2deg);
    transition: transform var(--landing-transition);
}

.landing-mockup:hover {
    transform: perspective(1200px) rotateY(-2deg) rotateX(1deg);
}

.landing-mockup__bar {
    display: flex;
    align-items: center;
    gap: 0.4rem;
    padding: 0.65rem 1rem;
    background: #f1f5f9;
    border-bottom: 1px solid #e2e8f0;
}

.landing-mockup__dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: #cbd5e1;
}

.landing-mockup__dot:nth-child(1) { background: #f87171; }
.landing-mockup__dot:nth-child(2) { background: #fbbf24; }
.landing-mockup__dot:nth-child(3) { background: #4ade80; }

.landing-mockup__body {
    display: grid;
    grid-template-columns: 72px 1fr;
    min-height: 280px;
}

.landing-mockup__sidebar {
    background: #0f172a;
    padding: 1rem 0.5rem;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.landing-mockup__sidebar span {
    height: 8px;
    border-radius: 4px;
    background: rgba(255, 255, 255, 0.15);
    margin: 0 0.35rem;
}

.landing-mockup__sidebar span.active {
    background: var(--landing-primary);
}

.landing-mockup__main {
    padding: 1rem;
    background: #f8fafc;
}

.landing-mockup__cards {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 0.5rem;
    margin-bottom: 0.75rem;
}

.landing-mockup__card {
    background: #fff;
    border-radius: 8px;
    padding: 0.5rem;
    border: 1px solid #e2e8f0;
}

.landing-mockup__card small {
    color: var(--landing-muted);
    font-size: 0.6rem;
}

.landing-mockup__card strong {
    font-size: 0.75rem;
    color: var(--landing-primary-dark);
}

.landing-mockup__chat {
    background: #fff;
    border-radius: 8px;
    border: 1px solid #e2e8f0;
    padding: 0.65rem;
}

.landing-mockup__chat-row {
    display: flex;
    gap: 0.5rem;
    align-items: center;
    padding: 0.35rem 0;
    border-bottom: 1px solid #f1f5f9;
    font-size: 0.7rem;
}

.landing-mockup__avatar {
    width: 24px;
    height: 24px;
    border-radius: 50%;
    background: linear-gradient(135deg, #0ea5e9, #6366f1);
    flex-shrink: 0;
}

/* Sections */
.landing-section {
    padding: 5rem 0;
}

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

.landing-section__label {
    display: inline-block;
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--landing-primary);
    margin-bottom: 0.75rem;
}

.landing-section__title {
    font-size: clamp(1.5rem, 3vw, 2.1rem);
    font-weight: 800;
    margin-bottom: 1rem;
    letter-spacing: -0.02em;
}

.landing-section__desc {
    color: var(--landing-muted);
    max-width: 640px;
    margin-bottom: 2.5rem;
    line-height: 1.7;
}

/* Channel cards */
.landing-channel {
    text-align: center;
    padding: 1.75rem 1rem;
    border-radius: var(--landing-radius);
    background: var(--landing-card);
    border: 1px solid rgba(148, 163, 184, 0.2);
    transition: transform var(--landing-transition), box-shadow var(--landing-transition);
    height: 100%;
}

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

.landing-channel__icon {
    width: 56px;
    height: 56px;
    border-radius: 14px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    margin-bottom: 1rem;
}

.landing-channel__icon--fb { background: #1877f2; color: #fff; }
.landing-channel__icon--zalo { background: #0068ff; color: #fff; }
.landing-channel__icon--tg { background: #26a5e4; color: #fff; }
.landing-channel__icon--web { background: var(--landing-gradient); color: #fff; }

/* Feature cards */
.landing-feature-card {
    padding: 1.75rem;
    border-radius: var(--landing-radius);
    background: var(--landing-card);
    border: 1px solid rgba(148, 163, 184, 0.2);
    height: 100%;
    transition: transform var(--landing-transition), box-shadow var(--landing-transition);
}

.landing-feature-card:hover {
    transform: translateY(-3px);
    box-shadow: 0 12px 32px rgba(15, 23, 42, 0.08);
}

.landing-feature-card__icon {
    width: 48px;
    height: 48px;
    border-radius: 12px;
    background: rgba(14, 165, 233, 0.1);
    color: var(--landing-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.35rem;
    margin-bottom: 1rem;
}

.landing-feature-card h3 {
    font-size: 1.05rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
}

.landing-feature-card p {
    color: var(--landing-muted);
    font-size: 0.92rem;
    margin-bottom: 0;
    line-height: 1.6;
}

/* AI highlight */
.landing-ai-panel {
    background: linear-gradient(145deg, #0f172a 0%, #1e3a5f 100%);
    border-radius: calc(var(--landing-radius) + 4px);
    padding: 2.5rem;
    color: #e2e8f0;
}

.landing-ai-panel .landing-section__title {
    color: #fff;
}

.landing-ai-panel .landing-section__desc {
    color: #94a3b8;
}

.landing-ai-card {
    background: rgba(255, 255, 255, 0.06);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--landing-radius);
    padding: 1.5rem;
    height: 100%;
    transition: background var(--landing-transition);
}

.landing-ai-card:hover {
    background: rgba(255, 255, 255, 0.1);
}

.landing-ai-card__icon {
    width: 44px;
    height: 44px;
    border-radius: 10px;
    background: var(--landing-gradient);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    color: #fff;
    margin-bottom: 1rem;
}

.landing-ai-card h3 {
    font-size: 1rem;
    font-weight: 700;
    color: #fff;
    margin-bottom: 0.5rem;
}

.landing-ai-card p {
    font-size: 0.9rem;
    color: #94a3b8;
    margin: 0;
    line-height: 1.6;
}

/* Core features tabs */
.landing-tabs .nav-link {
    color: var(--landing-muted);
    font-weight: 600;
    border: none;
    border-radius: 10px;
    padding: 0.65rem 1.25rem;
}

.landing-tabs .nav-link.active {
    background: var(--landing-gradient);
    color: #fff;
}

.landing-tab-pane {
    padding: 2rem;
    background: var(--landing-card);
    border-radius: var(--landing-radius);
    border: 1px solid rgba(148, 163, 184, 0.2);
}

.landing-tab-pane ul {
    margin: 0;
    padding-left: 1.25rem;
    color: var(--landing-muted);
    line-height: 1.9;
}

/* Benefits */
.landing-benefit {
    display: flex;
    gap: 1.25rem;
    align-items: flex-start;
    padding: 1.5rem;
    background: var(--landing-card);
    border-radius: var(--landing-radius);
    border: 1px solid rgba(148, 163, 184, 0.2);
    height: 100%;
    transition: box-shadow var(--landing-transition);
}

.landing-benefit:hover {
    box-shadow: var(--landing-shadow);
}

.landing-benefit__num {
    font-size: 2rem;
    font-weight: 800;
    line-height: 1;
    background: var(--landing-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    flex-shrink: 0;
}

.landing-benefit h3 {
    font-size: 1.05rem;
    font-weight: 700;
    margin-bottom: 0.35rem;
}

.landing-benefit p {
    color: var(--landing-muted);
    font-size: 0.92rem;
    margin: 0;
}

/* Consultation */
.landing-consult {
    background: var(--landing-gradient);
    border-radius: calc(var(--landing-radius) + 4px);
    padding: 2.5rem;
    color: #fff;
}

.landing-consult .form-control,
.landing-consult .form-select {
    border: none;
    border-radius: 10px;
    padding: 0.65rem 1rem;
}

.landing-consult .btn-light {
    font-weight: 600;
    border-radius: 10px;
    padding: 0.65rem 1.5rem;
}

/* Footer */
.landing-footer {
    background: #0f172a;
    color: #94a3b8;
    padding: 4rem 0 2rem;
}

.landing-footer a {
    color: #94a3b8;
    text-decoration: none;
    transition: color var(--landing-transition);
}

.landing-footer a:hover {
    color: #fff;
}

.landing-social a {
    width: 36px;
    height: 36px;
    border-radius: 8px;
    background: rgba(255, 255, 255, 0.08);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    color: #cbd5e1;
}

.landing-social a:hover {
    background: var(--landing-primary);
    color: #fff;
}

.landing-footer__bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.08);
}

/* Reveal animation */
.landing-reveal {
    opacity: 0;
    transform: translateY(24px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.landing-reveal.is-visible {
    opacity: 1;
    transform: translateY(0);
}

@media (max-width: 991.98px) {
    .landing-mockup {
        transform: none;
        margin-top: 2.5rem;
    }

    .landing-hero {
        padding-top: 2.5rem;
    }

    .landing-section {
        padding: 3.5rem 0;
    }
}

@media (max-width: 575.98px) {
    .landing-mockup__cards {
        grid-template-columns: 1fr;
    }

    .landing-hero__cta .btn {
        width: 100%;
    }

    .landing-hero__cta {
        display: flex;
        flex-direction: column;
        gap: 0.75rem;
    }
}

/* Privacy policy document */
.privacy-doc__body {
    line-height: 1.85;
    font-size: 0.975rem;
}

.privacy-doc__section {
    margin-bottom: 2rem;
    scroll-margin-top: 5rem;
}

.privacy-doc__section h3 {
    margin-bottom: 0.5rem;
}

.privacy-doc__section ul,
.privacy-doc__section ol {
    padding-left: 1.25rem;
}

.privacy-doc__section li {
    margin-bottom: 0.35rem;
}

.privacy-doc__section--highlight {
    background: var(--landing-bg);
    border: 1px solid rgba(14, 165, 233, 0.2);
    border-radius: var(--landing-radius);
    padding: 1.25rem 1.5rem;
}

.privacy-doc__toc a {
    color: var(--landing-primary-dark);
    text-decoration: none;
}

.privacy-doc__toc a:hover {
    text-decoration: underline;
}

.privacy-doc__toc ol {
    padding-left: 1.1rem;
    margin-bottom: 0;
}

.privacy-doc__toc li {
    margin-bottom: 0.25rem;
}