.landing-page, .landing-page *, .landing-page *::before, .landing-page *::after { box-sizing: border-box; }

.landing-page {
    margin: 0;
    width: 100%;
    --hero-page: #F3F2EC;
    --hero-panel: #12161D;
    --hero-panel-2: #141922;
    --hero-text: #FFFFFF;
    --hero-text-2: rgba(255, 255, 255, 0.72);
    --hero-text-3: rgba(255, 255, 255, 0.5);
    --hero-accent: #8F92FF;
    --hero-accent-soft: rgba(143, 146, 255, 0.14);
    --hero-border: rgba(255, 255, 255, 0.12);
    --ink: #12161D;
    --ink-2: rgba(18, 22, 29, 0.68);
    --ink-3: rgba(18, 22, 29, 0.46);
    --hairline: rgba(18, 22, 29, 0.13);
    --accent-deep: #5558DD;
    --header-h: 68px;
    --section-pad: clamp(4.5rem, 8vw, 8rem);
    --shell-radius: 18px;
    margin: 0;
    background: var(--hero-page);
    color: var(--hero-panel);
    font-family: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    -webkit-font-smoothing: antialiased;
}

.landing-page .skip-link {
    position: absolute;
    transform: translateY(-180%);
    z-index: 300;
    padding: .65rem .9rem;
    border-radius: 999px;
    background: var(--hero-panel);
    color: var(--hero-text);
    text-decoration: none;
    font-weight: 600;
}
.landing-page .skip-link:focus { transform: translateY(0); }

.landing-page .sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    margin: -1px;
    padding: 0;
    overflow: hidden;
    clip: rect(0 0 0 0);
    clip-path: inset(50%);
    white-space: nowrap;
    border: 0;
}

.hero {
    width: 100%;
    min-height: 100dvh;
    margin: 0;
    padding: 0;
}

.hero-shell {
    position: relative;
    width: 100%;
    min-height: 100dvh;
    margin: 0;
    overflow: hidden;
    background: var(--hero-panel);
    isolation: isolate;
}

.hero-media {
    position: absolute;
    inset: 0;
    margin: 0;
    z-index: 1;
}

.hero-media img {
    width: 100%;
    height: 100%;
    /* Crop keeps the flag -> Turtle Tower -> scales focal stack in frame. */
    object-fit: cover;
    object-position: 64% 36%;
    display: block;
}

.hero-curve {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    z-index: 2;
    pointer-events: none;
    filter: drop-shadow(6px 0 24px rgba(18, 22, 29, 0.18));
}

.hero-panel {
    position: relative;
    z-index: 3;
    display: flex;
    flex-direction: column;
    width: 100%;
    min-height: 100dvh;
    color: var(--hero-text);
}
.hero-panel-inner {
    width: min(1440px, 100%);
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    min-height: 100dvh;
    padding: calc(var(--header-h) + clamp(1rem, 3vh, 2rem)) clamp(1.75rem, 3.2vw, 3.5rem) clamp(2rem, 6vh, 4rem);
    box-sizing: border-box;
}

.hero-nav {
    display: flex;
    align-items: center;
    gap: clamp(1rem, 2.5vw, 2.25rem);
}

.hero-brand {
    display: inline-flex;
    align-items: center;
    gap: .55rem;
    color: var(--hero-text);
    text-decoration: none;
    flex: 0 0 auto;
}

.hero-brand-mark {
    width: 26px;
    height: 26px;
    border-radius: 7px;
    object-fit: contain;
}

.hero-brand-word {
    font-size: 1.0625rem;
    font-weight: 600;
    letter-spacing: -.015em;
}

.hero-nav-links {
    display: flex;
    align-items: center;
    gap: clamp(.85rem, 1.8vw, 1.6rem);
    margin-right: auto;
}

.hero-nav-links a {
    color: var(--hero-text-2);
    text-decoration: none;
    font-size: .8125rem;
    font-weight: 500;
    white-space: nowrap;
    transition: color .16s ease;
}

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

.hero-nav-cta {
    flex: 0 0 auto;
    padding: .5rem .95rem;
    border: 1px solid var(--hero-border);
    border-radius: 9px;
    background: var(--hero-accent-soft);
    color: var(--hero-text);
    text-decoration: none;
    font-size: .8125rem;
    font-weight: 550;
    white-space: nowrap;
    transition: border-color .16s ease, background .16s ease;
}

.hero-nav-cta:hover {
    border-color: rgba(143, 146, 255, 0.45);
    background: rgba(143, 146, 255, 0.22);
}

.hero-body {
    display: flex;
    flex-direction: column;
    gap: clamp(1rem, 2vh, 1.4rem);
    margin: auto 0;
    max-width: 36rem;
}

.hero-eyebrow {
    display: inline-flex;
    align-items: center;
    gap: .55rem;
    width: fit-content;
    padding: .35rem .85rem;
    border-radius: 999px;
    background: rgba(143, 146, 255, 0.12);
    border: 1px solid rgba(143, 146, 255, 0.25);
    color: #B5B7FF;
    font-size: .78125rem;
    font-weight: 550;
    letter-spacing: .02em;
}

.hero-eyebrow-dot {
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--hero-accent);
    box-shadow: 0 0 8px rgba(143, 146, 255, 0.7);
}

.hero-heading {
    margin: 0;
    font-size: clamp(2.2rem, 3.8vw, 3.6rem);
    font-weight: 700;
    line-height: 1.08;
    letter-spacing: -.035em;
    text-wrap: balance;
}

.hero-heading-accent {
    display: inline-block;
    color: var(--hero-accent);
}

.hero-lede {
    margin: 0;
    max-width: 32rem;
    color: var(--hero-text-2);
    font-size: clamp(.9375rem, 1.05vw, 1.0625rem);
    line-height: 1.6;
}

.hero-search-wrapper {
    display: flex;
    flex-direction: column;
    gap: .65rem;
    width: 100%;
    max-width: 33rem;
    margin-top: .25rem;
}

.hero-search {
    display: flex;
    align-items: center;
    gap: .65rem;
    width: 100%;
    padding: .45rem .45rem .45rem 1rem;
    border: 1px solid rgba(255, 255, 255, 0.16);
    border-radius: 14px;
    background: rgba(255, 255, 255, 0.08);
    backdrop-filter: blur(12px);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.25);
    transition: border-color .18s ease, background .18s ease, box-shadow .18s ease;
}

.hero-search:focus-within {
    border-color: rgba(143, 146, 255, 0.65);
    background: rgba(255, 255, 255, 0.12);
    box-shadow: 0 0 0 3px rgba(143, 146, 255, 0.2), 0 6px 24px rgba(0, 0, 0, 0.3);
}

.hero-search-icon {
    flex: 0 0 18px;
    width: 18px;
    height: 18px;
    color: var(--hero-accent);
}

.hero-search-icon svg { display: block; width: 18px; height: 18px; }

.hero-search input {
    flex: 1;
    min-width: 0;
    border: 0;
    outline: 0;
    background: transparent;
    color: var(--hero-text);
    font-family: inherit;
    font-size: .9375rem;
}

.hero-search input::placeholder { color: var(--hero-text-3); }
.hero-search input::-webkit-search-cancel-button { filter: invert(1) opacity(.55); }

.hero-search-submit {
    display: inline-flex;
    align-items: center;
    gap: .4rem;
    flex: 0 0 auto;
    padding: .62rem 1.15rem;
    border: 0;
    border-radius: 10px;
    background: var(--hero-accent);
    color: #101322;
    cursor: pointer;
    font-family: inherit;
    font-size: .85rem;
    font-weight: 600;
    transition: background .16s ease, transform .16s ease;
}

.hero-search-submit:hover {
    background: #9B9CFF;
    transform: translateY(-1px);
}

.hero-submit-arrow {
    width: 14px;
    height: 14px;
    transition: transform .18s ease;
}

.hero-search-submit:hover .hero-submit-arrow {
    transform: translateX(2px);
}

.hero-suggestions {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: .45rem .55rem;
    font-size: .78125rem;
}

.suggestions-label {
    color: var(--hero-text-3);
    font-size: .75rem;
    font-weight: 500;
}

.suggestion-chip {
    display: inline-flex;
    align-items: center;
    padding: .24rem .65rem;
    border-radius: 7px;
    background: rgba(255, 255, 255, 0.06);
    border: 1px solid rgba(255, 255, 255, 0.1);
    color: var(--hero-text-2);
    text-decoration: none;
    font-size: .75rem;
    transition: all .16s ease;
}

.suggestion-chip:hover {
    background: rgba(143, 146, 255, 0.15);
    border-color: rgba(143, 146, 255, 0.35);
    color: var(--hero-text);
    transform: translateY(-1px);
}

.hero-trust {
    display: flex;
    flex-direction: column;
    gap: .55rem;
    margin: .4rem 0 0;
    padding: 0;
    list-style: none;
}

@media (min-width: 640px) {
    .hero-trust {
        display: grid;
        grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
        gap: .6rem 1.25rem;
    }
}

.hero-trust li {
    display: inline-flex;
    align-items: center;
    gap: .55rem;
    color: var(--hero-text-2);
    font-size: .8125rem;
    line-height: 1.4;
}

.trust-icon {
    flex: 0 0 16px;
    width: 16px;
    height: 16px;
    color: var(--hero-accent);
}

@media (max-width: 1080px) {
    .hero-panel-inner { gap: 2rem; }
    .hero-nav-links { display: none; }
    .hero-body { max-width: 30rem; }
    .hero-search-wrapper { max-width: 29rem; }
    .hero-trust { display: flex; flex-direction: column; gap: .5rem; }
}

@media (max-width: 860px) {
    .hero { min-height: auto; padding: 0; }

    .hero-shell {
        width: 100%;
        min-height: auto;
        overflow: visible;
        display: flex;
        flex-direction: column;
    }

    .hero-curve { display: none; }

    .hero-media {
        position: relative;
        inset: auto;
        order: 2;
        width: 100%;
        aspect-ratio: 16 / 9;
        min-height: 260px;
    }

    .hero-media img { object-position: center 30%; }

    .hero-panel {
        order: 1;
        width: 100%;
        min-height: auto;
    }

    .hero-panel-inner {
        min-height: auto;
        gap: 1.5rem;
        padding: calc(var(--header-h) + 1.25rem) 1.25rem 2.5rem;
    }

    .hero-body { margin: 0; max-width: none; }
    .hero-lede, .hero-search-wrapper { max-width: 36rem; }
}

@media (max-width: 560px) {
    .hero-panel-inner { padding: calc(var(--header-h) + 1rem) 1.1rem 2rem; }
    .hero-search { padding: .4rem .4rem .4rem .85rem; }
    .hero-search-submit { padding: .55rem .9rem; font-size: .8125rem; }
    .hero-suggestions { gap: .35rem .45rem; }
    .hero-trust { gap: .5rem; }
}

@media (prefers-reduced-motion: reduce) {
    .landing-page * { transition-duration: .01ms !important; }
}

/* ==========================================================================
   Scrolling homepage — sections continue the hero's design language.
   Dark editorial surfaces + cream page + indigo accent, same radii and rhythm.
   ========================================================================== */

html { scroll-behavior: smooth; }

.site-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 60;
    background: rgba(18, 22, 29, 0.88);
    backdrop-filter: blur(14px) saturate(140%);
    -webkit-backdrop-filter: blur(14px) saturate(140%);
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    transition: background .25s ease, border-color .25s ease, box-shadow .25s ease;
}

.site-header.is-scrolled {
    background: rgba(18, 22, 29, 0.96);
    backdrop-filter: blur(14px) saturate(140%);
    border-bottom-color: rgba(255, 255, 255, 0.14);
    box-shadow: 0 4px 24px rgba(0, 0, 0, 0.35);
}

.site-header-inner {
    width: min(1440px, 100%);
    margin: 0 auto;
    min-height: var(--header-h);
    padding: 0 clamp(1.25rem, 3.2vw, 3.5rem);
}

.section {
    position: relative;
    width: 100%;
    scroll-margin-top: calc(var(--header-h) + 12px);
}

.section--cream { background: var(--hero-page); color: var(--ink); }
.section--dark { background: var(--hero-panel); color: var(--hero-text); }

.section-pad { padding-block: var(--section-pad); }
.section-pad--tight { padding-block: clamp(3.5rem, 6vw, 5.5rem); }

.section-inner {
    width: min(1440px, 100%);
    margin: 0 auto;
    padding-inline: clamp(1.25rem, 3.2vw, 3.5rem);
}

.section-head { max-width: 46rem; }

.section-eyebrow {
    display: inline-flex;
    align-items: center;
    gap: .5rem;
    color: var(--accent-deep);
    font-size: .72rem;
    font-weight: 600;
    letter-spacing: .14em;
    text-transform: uppercase;
}

.section--dark .section-eyebrow { color: var(--hero-accent); }

.section-title {
    margin: .85rem 0 0;
    font-size: clamp(1.7rem, 3.1vw, 2.5rem);
    line-height: 1.14;
    letter-spacing: -.03em;
    font-weight: 700;
    text-wrap: balance;
}

.section-lede {
    margin: 1rem 0 0;
    max-width: 44ch;
    color: var(--ink-2);
    font-size: 1rem;
    line-height: 1.72;
}

.section--dark .section-lede { color: var(--hero-text-2); }

/* --- Intro: dark panels on cream, mirroring the hero's dark-on-cream logic --- */

.intro-grid {
    display: grid;
    grid-template-columns: minmax(0, .95fr) minmax(0, 1.05fr);
    gap: clamp(2rem, 5vw, 4.5rem);
    align-items: start;
}

.feature-list { display: grid; gap: .9rem; margin: 0; padding: 0; list-style: none; }

.feature-panel {
    display: grid;
    grid-template-columns: 38px 1fr;
    gap: 1rem;
    align-items: start;
    padding: 1.25rem 1.4rem;
    border: 1px solid rgba(255, 255, 255, 0.07);
    border-radius: var(--shell-radius);
    background: var(--hero-panel);
    color: var(--hero-text);
}

.feature-icon {
    display: grid;
    place-items: center;
    width: 38px;
    height: 38px;
    border: 1px solid var(--hero-border);
    border-radius: 11px;
    background: var(--hero-accent-soft);
    color: var(--hero-accent);
}

.feature-icon svg { display: block; width: 18px; height: 18px; }

.feature-content {
    min-width: 0;
}

.feature-panel h3 { margin: 0; font-size: 1rem; font-weight: 600; letter-spacing: -.01em; }
.feature-panel p { margin: .3rem 0 0; color: var(--hero-text-2); font-size: .88rem; line-height: 1.6; }

/* --- Cách sử dụng: large numerals, hairline rhythm --- */

.step-list {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: clamp(1.25rem, 3vw, 2.75rem);
    margin: clamp(2.25rem, 4vw, 3.5rem) 0 0;
    padding: 0;
    list-style: none;
    counter-reset: step;
}

.step {
    padding-top: 1.4rem;
    border-top: 1px solid var(--hairline);
}

.step-number {
    display: block;
    color: var(--accent-deep);
    font-size: clamp(2.4rem, 4.4vw, 3.4rem);
    font-weight: 700;
    line-height: 1;
    letter-spacing: -.05em;
}

.step h3 { margin: 1rem 0 0; font-size: 1.06rem; font-weight: 600; letter-spacing: -.015em; }
.step p { margin: .4rem 0 0; color: var(--ink-2); font-size: .9rem; line-height: 1.62; }

/* --- Nguồn pháp lý: institutional dark, document layers --- */

.sources-grid {
    display: grid;
    grid-template-columns: minmax(0, 1.25fr) minmax(0, .75fr);
    gap: clamp(2rem, 5vw, 4.5rem);
    align-items: center;
}

.source-list { margin: clamp(2rem, 4vw, 3rem) 0 0; padding: 0; list-style: none; }

.source-row {
    display: grid;
    grid-template-columns: 30px 1fr;
    gap: 1rem;
    align-items: baseline;
    padding: 1.05rem 0;
    border-top: 1px solid var(--hero-border);
}

.source-row:last-child { border-bottom: 1px solid var(--hero-border); }

.source-mark {
    color: var(--hero-accent);
    font-size: 1.15rem;
    font-weight: 600;
    line-height: 1;
}

.source-row h3 { margin: 0; font-size: 1rem; font-weight: 600; }
.source-row p { margin: .25rem 0 0; color: var(--hero-text-2); font-size: .86rem; line-height: 1.55; }

.section-cta {
    display: inline-flex;
    align-items: center;
    gap: .5rem;
    margin-top: clamp(1.75rem, 3vw, 2.5rem);
    padding: .7rem 1.15rem;
    border: 1px solid var(--hero-border);
    border-radius: 11px;
    background: var(--hero-accent-soft);
    color: var(--hero-text);
    text-decoration: none;
    font-size: .875rem;
    font-weight: 550;
    transition: border-color .18s ease, background .18s ease;
}

.section-cta:hover { border-color: rgba(143, 146, 255, 0.45); background: rgba(143, 146, 255, 0.22); }

.doc-stack { position: relative; display: grid; gap: .75rem; }

.doc-layer {
    display: flex;
    align-items: flex-end;
    min-height: 96px;
    padding: 1rem 1.25rem;
    border: 1px solid var(--hero-border);
    border-radius: var(--shell-radius);
    background: rgba(255, 255, 255, 0.03);
    color: var(--hero-text-2);
    font-size: .8rem;
    font-weight: 550;
}

.doc-layer--3 { transform: translateX(-14%) scale(.96); opacity: .55; }
.doc-layer--2 { transform: translateX(-7%) scale(.98); opacity: .78; }
.doc-layer--1 { border-color: rgba(143, 146, 255, 0.35); background: rgba(143, 146, 255, 0.1); color: var(--hero-accent); }

/* --- Use cases: asymmetric 2x2 --- */

.usecase-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: clamp(1rem, 2.2vw, 1.75rem);
    margin: clamp(2.25rem, 4vw, 3.5rem) 0 0;
    padding: 0;
    list-style: none;
}

.usecase {
    padding: 1.6rem 1.7rem;
    border: 1px solid var(--hairline);
    border-radius: var(--shell-radius);
    background: rgba(255, 255, 255, 0.55);
    transition: border-color .18s ease, transform .18s ease;
}

.usecase:nth-child(odd) { transform: translateY(0); }
.usecase:nth-child(even) { transform: translateY(clamp(.75rem, 2vw, 1.75rem)); }
.usecase:hover { border-color: rgba(18, 22, 29, 0.28); }

.usecase h3 { margin: 0; font-size: 1.08rem; font-weight: 600; letter-spacing: -.015em; }
.usecase p { margin: .4rem 0 0; color: var(--ink-2); font-size: .9rem; line-height: 1.6; }

/* --- Nguyên tắc: calm institutional list --- */

.principle-list {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: clamp(1.25rem, 3vw, 2.5rem);
    margin: clamp(2.25rem, 4vw, 3.5rem) 0 0;
    padding: 0;
    list-style: none;
}

.principle { padding-left: 1.4rem; border-left: 2px solid var(--accent-deep); }
.principle h3 { margin: 0; font-size: 1.02rem; font-weight: 600; letter-spacing: -.015em; }
.principle p { margin: .35rem 0 0; color: var(--ink-2); font-size: .88rem; line-height: 1.6; }

/* --- Vì sao SmarTax tồn tại: editorial dark with hero motif --- */

.story-grid {
    display: grid;
    grid-template-columns: minmax(0, 1fr) minmax(0, .9fr);
    gap: clamp(2rem, 5vw, 4.5rem);
    align-items: center;
}

.fragment-frame {
    position: relative;
    margin: 0;
    aspect-ratio: 4 / 3;
    overflow: hidden;
    border: 1px solid var(--hero-border);
    border-radius: 22px;
    background: var(--hero-panel-2);
}

.fragment-frame img {
    display: block;
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: 60% 62%;
}

.fragment-frame::after {
    content: "";
    position: absolute;
    inset: 0;
    background: linear-gradient(180deg, rgba(18, 22, 29, 0.05), rgba(18, 22, 29, 0.35));
    pointer-events: none;
}

/* --- Final CTA: dark panel on cream, closing the circle with the hero --- */

.final-panel {
    position: relative;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: clamp(1.5rem, 3vw, 2.25rem);
    padding: clamp(3rem, 7vw, 5.5rem) clamp(1.5rem, 4vw, 3rem);
    overflow: hidden;
    border-radius: 26px;
    background: var(--hero-panel);
    text-align: center;
}

.final-panel::before {
    content: "";
    position: absolute;
    inset: auto -10% -60% auto;
    width: 60%;
    aspect-ratio: 1;
    background: radial-gradient(circle, rgba(143, 146, 255, 0.22), transparent 68%);
    pointer-events: none;
}

.final-title {
    position: relative;
    margin: 0;
    max-width: 22ch;
    color: var(--hero-text);
    font-size: clamp(1.9rem, 4vw, 3rem);
    line-height: 1.1;
    letter-spacing: -.035em;
    font-weight: 700;
    text-wrap: balance;
}

.final-cta {
    position: relative;
    display: inline-flex;
    align-items: center;
    padding: .85rem 1.6rem;
    border-radius: 12px;
    background: var(--hero-accent);
    color: #101322;
    text-decoration: none;
    font-size: .95rem;
    font-weight: 600;
    transition: background .18s ease, transform .18s ease;
}

.final-cta:hover { background: #9B9CFF; transform: translateY(-1px); }

/* --- Footer --- */

.site-footer {
    padding-block: clamp(3rem, 6vw, 4.5rem) clamp(2rem, 4vw, 3rem);
    background: var(--hero-panel);
    color: var(--hero-text-2);
}

.footer-grid {
    display: grid;
    grid-template-columns: minmax(0, 1.5fr) repeat(4, minmax(0, 1fr));
    gap: clamp(1.75rem, 4vw, 3.5rem);
}

.footer-brand p { margin: 1rem 0 0; max-width: 30ch; font-size: .86rem; line-height: 1.65; }

.footer-col { display: grid; gap: .6rem; align-content: start; }

.footer-col h3 {
    margin: 0 0 .35rem;
    color: var(--hero-text);
    font-size: .8rem;
    font-weight: 600;
    letter-spacing: .1em;
    text-transform: uppercase;
}

.footer-col a { color: var(--hero-text-2); text-decoration: none; font-size: .86rem; transition: color .16s ease; }
.footer-col a:hover { color: var(--hero-text); }

/* --- Scroll reveal: small, purposeful, reduced-motion safe --- */

.js [data-reveal] { opacity: 0; transform: translateY(14px); }
.js [data-reveal].is-in { opacity: 1; transform: none; transition: opacity .7s ease, transform .7s ease; }

@media (prefers-reduced-motion: reduce) {
    html { scroll-behavior: auto; }
    .js [data-reveal] { opacity: 1; transform: none; transition: none; }
}

/* --- Responsive --- */

@media (max-width: 1080px) {
    .intro-grid, .sources-grid, .story-grid { grid-template-columns: 1fr; }
    .doc-stack { max-width: 420px; }
    .footer-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 860px) {
    .step-list, .principle-list { grid-template-columns: 1fr; }
    .usecase-grid { grid-template-columns: 1fr; }
    .usecase:nth-child(even) { transform: none; }
}

@media (max-width: 560px) {
    .feature-panel { grid-template-columns: 1fr; gap: .75rem; }
    .footer-grid { grid-template-columns: 1fr; }
    .fragment-frame { aspect-ratio: 3 / 4; }
}