/* =========================================================
   Clara — Static Website
   Global styles
   ========================================================= */

/* ---------- Design tokens ---------- */

:root {
    --color-bg: #f7faf9;
    --color-bg-soft: #eef6f4;
    --color-surface: #ffffff;
    --color-surface-soft: #f4f8f7;

    --color-text: #17332f;
    --color-text-soft: #526762;
    --color-text-muted: #71817d;

    --color-primary: #176b5d;
    --color-primary-dark: #105348;
    --color-primary-light: #dcefeb;

    --color-accent: #d8a84e;
    --color-accent-soft: #f8eed8;

    --color-border: #dce8e4;
    --color-border-strong: #c8d9d4;

    --color-shadow: rgba(23, 51, 47, 0.08);
    --color-shadow-strong: rgba(23, 51, 47, 0.14);

    --font-sans:
        Inter, ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI",
        Roboto, Helvetica, Arial, sans-serif;

    --font-serif:
        Georgia, "Times New Roman", serif;

    --max-width: 1160px;
    --content-width: 900px;

    --radius-sm: 8px;
    --radius-md: 14px;
    --radius-lg: 22px;
    --radius-xl: 30px;

    --transition: 180ms ease;
}


/* ---------- Reset ---------- */

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

html {
    scroll-behavior: smooth;
}

body {
    margin: 0;
    background: var(--color-bg);
    color: var(--color-text);
    font-family: var(--font-sans);
    font-size: 16px;
    line-height: 1.65;
    -webkit-font-smoothing: antialiased;
    text-rendering: optimizeLegibility;
}

img,
video {
    display: block;
    max-width: 100%;
}

button,
a {
    font: inherit;
}

a {
    color: inherit;
}


/* ---------- Accessibility ---------- */

:focus-visible {
    outline: 3px solid rgba(216, 168, 78, 0.7);
    outline-offset: 4px;
}

.skip-link {
    position: absolute;
    left: 16px;
    top: -100px;
    z-index: 1000;
    padding: 10px 16px;
    border-radius: var(--radius-sm);
    background: var(--color-primary-dark);
    color: #fff;
    text-decoration: none;
}

.skip-link:focus {
    top: 16px;
}


/* ---------- Layout ---------- */

.container {
    width: min(calc(100% - 40px), var(--max-width));
    margin-inline: auto;
}

.container--narrow {
    width: min(calc(100% - 40px), var(--content-width));
    margin-inline: auto;
}

section {
    scroll-margin-top: 90px;
}


/* ---------- Header / Navigation ---------- */

.site-header {
    position: sticky;
    top: 0;
    z-index: 100;
    border-bottom: 1px solid rgba(220, 232, 228, 0.85);
    background: rgba(247, 250, 249, 0.94);
    backdrop-filter: blur(12px);
}

.nav {
    min-height: 72px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 32px;
}

.brand {
    display: inline-flex;
    align-items: center;
    gap: 11px;
    color: var(--color-text);
    text-decoration: none;
    font-weight: 700;
    letter-spacing: -0.02em;
}

.brand-mark {
    width: 34px;
    height: 34px;
    display: grid;
    place-items: center;
    border-radius: 10px;
    background: var(--color-primary);
    color: #fff;
    font-size: 17px;
    font-weight: 700;
}

.brand-name {
    font-size: 20px;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 28px;
}

.nav-links a {
    color: var(--color-text-soft);
    font-size: 14px;
    font-weight: 600;
    text-decoration: none;
    transition:
        color var(--transition),
        opacity var(--transition);
}

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

.nav-links .nav-demo {
    padding: 9px 15px;
    border: 1px solid var(--color-primary);
    border-radius: 999px;
    color: var(--color-primary);
}

.nav-links .nav-demo:hover {
    background: var(--color-primary);
    color: #fff;
}


/* ---------- Hero ---------- */

.hero {
    position: relative;
    overflow: hidden;
    padding: 104px 0 92px;
    background:
        radial-gradient(circle at 80% 15%,
            rgba(216, 168, 78, 0.13),
            transparent 28%),
        radial-gradient(circle at 12% 60%,
            rgba(23, 107, 93, 0.09),
            transparent 30%),
        var(--color-bg);
}

.hero-inner {
    display: grid;
    grid-template-columns: minmax(0, 1.05fr) minmax(360px, 0.95fr);
    align-items: center;
    gap: 72px;
}

.eyebrow {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    margin: 0 0 20px;
    color: var(--color-primary);
    font-size: 13px;
    font-weight: 750;
    letter-spacing: 0.1em;
    text-transform: uppercase;
}

.eyebrow::before {
    content: "";
    width: 22px;
    height: 2px;
    border-radius: 999px;
    background: var(--color-accent);
}

.hero h1 {
    max-width: none;
    margin: 0;
    font-size: clamp(32px, 4vw, 52px);
    line-height: 1.15;
    letter-spacing: -0.045em;
    font-weight: 750;
}

.hero-principles {
    white-space: nowrap;
}

.hero-principles span {
    color: var(--color-primary);
}

@media (max-width: 900px) {
    .hero-principles {
        white-space: normal;
    }
}

.hero h1 span {
    color: var(--color-primary);
}

.hero-tagline {
    max-width: 650px;
    margin: 28px 0 0;
    color: var(--color-text-soft);
    font-size: clamp(19px, 2vw, 23px);
    line-height: 1.55;
}

.hero-actions {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 14px;
    margin-top: 36px;
}


/* ---------- Buttons ---------- */

.button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 9px;
    min-height: 48px;
    padding: 12px 20px;
    border: 1px solid transparent;
    border-radius: 999px;
    cursor: pointer;
    font-size: 15px;
    font-weight: 700;
    line-height: 1;
    text-decoration: none;
    transition:
        transform var(--transition),
        box-shadow var(--transition),
        background var(--transition),
        color var(--transition),
        border-color var(--transition);
}

.button:hover {
    transform: translateY(-2px);
}

.button--primary {
    background: var(--color-primary);
    color: #fff;
    box-shadow: 0 10px 24px rgba(23, 107, 93, 0.2);
}

.button--primary:hover {
    background: var(--color-primary-dark);
    box-shadow: 0 14px 30px rgba(23, 107, 93, 0.25);
}

.button--secondary {
    border-color: var(--color-border-strong);
    background: rgba(255, 255, 255, 0.75);
    color: var(--color-text);
}

.button--secondary:hover {
    border-color: var(--color-primary);
    color: var(--color-primary);
}

.button--demo {
    min-height: 58px;
    padding: 16px 28px;
    font-size: 17px;
}

.button-icon {
    font-size: 18px;
}


/* ---------- Hero visual ---------- */

.hero-visual {
    position: relative;
}

.hero-card {
    position: relative;
    overflow: hidden;
    padding: 28px;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-xl);
    background: var(--color-surface);
    box-shadow:
        0 24px 60px var(--color-shadow),
        0 4px 12px rgba(23, 51, 47, 0.04);
}

.hero-card::before {
    content: "";
    position: absolute;
    width: 180px;
    height: 180px;
    top: -80px;
    right: -50px;
    border-radius: 50%;
    background: var(--color-primary-light);
}

.hero-card-header {
    position: relative;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 20px;
    padding-bottom: 20px;
    border-bottom: 1px solid var(--color-border);
}

.hero-card-title {
    font-weight: 750;
    letter-spacing: -0.02em;
}

.status-pill {
    display: inline-flex;
    align-items: center;
    gap: 7px;
    padding: 6px 10px;
    border-radius: 999px;
    background: var(--color-primary-light);
    color: var(--color-primary-dark);
    font-size: 12px;
    font-weight: 700;
}

.status-pill::before {
    content: "";
    width: 7px;
    height: 7px;
    border-radius: 50%;
    background: #3a9b7c;
}

.hero-card-body {
    position: relative;
    padding-top: 24px;
}

.hero-conversation {
    display: grid;
    gap: 15px;
}

.message {
    max-width: 88%;
    padding: 13px 15px;
    border-radius: 16px;
    font-size: 14px;
    line-height: 1.55;
}

.message--user {
    justify-self: end;
    border-bottom-right-radius: 5px;
    background: var(--color-primary);
    color: #fff;
}

.message--clara {
    justify-self: start;
    border-bottom-left-radius: 5px;
    background: var(--color-surface-soft);
    color: var(--color-text);
}

.message-label {
    display: block;
    margin-bottom: 4px;
    font-size: 10px;
    font-weight: 750;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    opacity: 0.65;
}


/* ---------- Section defaults ---------- */

.section {
    padding: 100px 0;
}

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

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

.section-heading {
    max-width: 760px;
    margin-bottom: 52px;
}

.section-heading--center {
    margin-inline: auto;
    text-align: center;
}

.section-heading h2 {
    margin: 0;
    font-size: clamp(32px, 4vw, 48px);
    line-height: 1.12;
    letter-spacing: -0.04em;
}

.section-heading p {
    margin: 18px 0 0;
    color: var(--color-text-soft);
    font-size: 18px;
    line-height: 1.65;
}


/* ---------- Core message ---------- */

.core-message {
    padding: 92px 0;
    background: var(--color-primary);
    color: #fff;
}

.core-message-inner {
    max-width: 900px;
    margin-inline: auto;
    text-align: center;
}

.core-message h2 {
    margin: 0;
    font-size: clamp(36px, 5vw, 58px);
    line-height: 1.08;
    letter-spacing: -0.045em;
}

.core-message p {
    max-width: 720px;
    margin: 24px auto 0;
    color: rgba(255, 255, 255, 0.78);
    font-size: 18px;
}


/* ---------- Feature cards ---------- */

.feature-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 22px;
}

.feature-card {
    padding: 30px;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    background: var(--color-surface);
    box-shadow: 0 8px 25px rgba(23, 51, 47, 0.035);
}

.feature-icon {
    width: 44px;
    height: 44px;
    display: grid;
    place-items: center;
    margin-bottom: 22px;
    border-radius: 13px;
    background: var(--color-primary-light);
    color: var(--color-primary);
    font-size: 19px;
    font-weight: 750;
}

.feature-card:nth-child(2) .feature-icon {
    background: var(--color-accent-soft);
    color: #8a651d;
}

.feature-card h3 {
    margin: 0;
    font-size: 21px;
    line-height: 1.25;
    letter-spacing: -0.025em;
}

.feature-card p {
    margin: 12px 0 0;
    color: var(--color-text-soft);
    font-size: 15px;
}


/* ---------- Demo preview ---------- */

.demo-section {
    padding: 108px 0;
}

.demo-preview {
    overflow: hidden;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-xl);
    background: #132e2a;
    box-shadow: 0 25px 70px var(--color-shadow-strong);
}

.demo-preview-top {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 20px;
    padding: 16px 22px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.09);
    color: rgba(255, 255, 255, 0.72);
    font-size: 13px;
}

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

.demo-window-dots span {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.35);
}

.demo-window-title {
    flex: 1;
    text-align: center;
}

.demo-preview-content {
    display: grid;
    grid-template-columns: 0.7fr 1.3fr;
    min-height: 470px;
}

.demo-sidebar {
    padding: 30px 24px;
    border-right: 1px solid rgba(255, 255, 255, 0.08);
    background: rgba(0, 0, 0, 0.12);
}

.demo-sidebar-label {
    margin: 0 0 18px;
    color: rgba(255, 255, 255, 0.45);
    font-size: 11px;
    font-weight: 750;
    letter-spacing: 0.1em;
    text-transform: uppercase;
}

.demo-sidebar-item {
    padding: 11px 12px;
    border-radius: 9px;
    color: rgba(255, 255, 255, 0.62);
    font-size: 13px;
}

.demo-sidebar-item--active {
    background: rgba(255, 255, 255, 0.09);
    color: #fff;
}

.demo-main {
    display: flex;
    flex-direction: column;
    justify-content: center;
    padding: 44px;
}

.demo-main-label {
    margin-bottom: 12px;
    color: #7ec8b9;
    font-size: 12px;
    font-weight: 750;
    letter-spacing: 0.08em;
    text-transform: uppercase;
}

.demo-main h3 {
    max-width: 650px;
    margin: 0;
    color: #fff;
    font-size: clamp(28px, 4vw, 42px);
    line-height: 1.12;
    letter-spacing: -0.035em;
}

.demo-main p {
    max-width: 620px;
    margin: 18px 0 0;
    color: rgba(255, 255, 255, 0.65);
    font-size: 16px;
}

.demo-main .button {
    align-self: flex-start;
    margin-top: 28px;
}


/* ---------- Demo highlights ---------- */

.demo-highlights {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
    margin-top: 26px;
}

.demo-highlight {
    padding: 24px;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    background: var(--color-surface);
}

.demo-highlight h3 {
    margin: 0;
    font-size: 17px;
    line-height: 1.3;
}

.demo-highlight p {
    margin: 9px 0 0;
    color: var(--color-text-soft);
    font-size: 14px;
}

/* ---------- Demo video ---------- */

.video-wrapper {
    width: 75%;
    max-width: 960px;
    margin: 34px auto 0;
    overflow: hidden;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-xl);
    background: #132e2a;
    box-shadow: 0 20px 55px var(--color-shadow-strong);
    scroll-margin-top: 90px;
}

.demo-video {
    display: block;
    width: 100%;
    height: auto;
    aspect-ratio: 16 / 9;
    background: #132e2a;
}


/* ---------- How Clara works ---------- */

.workflow {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 22px;
}

.workflow-step {
    position: relative;
    padding: 30px;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    background: var(--color-surface);
    box-shadow: 0 8px 25px rgba(23, 51, 47, 0.035);
}

.workflow-number {
    margin-bottom: 14px;
    color: var(--color-primary);
    font-size: 12px;
    font-weight: 800;
    letter-spacing: 0.08em;
}

.workflow-step h3 {
    margin: 0;
    font-size: 20px;
    line-height: 1.3;
    letter-spacing: -0.02em;
}

.workflow-step p {
    max-width: 620px;
    margin: 10px 0 0;
    color: var(--color-text-soft);
    font-size: 15px;
    line-height: 1.6;
}

/* ---------- Research connection ---------- */

.research-section {
    padding: 96px 0;
    background: var(--color-bg-soft);
}

.research-card {
    display: grid;
    grid-template-columns: minmax(260px, 0.38fr) minmax(0, 0.62fr);
    gap: 72px;
    max-width: none;
    padding: 0;
}

.research-copy {
    min-width: 0;
}

.research-copy .eyebrow {
    margin-bottom: 22px;
}

.research-card h2 {
    max-width: 430px;
    margin: 0;
    font-size: clamp(32px, 4vw, 48px);
    line-height: 1.08;
    letter-spacing: -0.04em;
}

.research-card p {
    max-width: 760px;
    margin: 0;
    color: var(--color-text-soft);
    font-size: 16px;
    line-height: 1.65;
}

.research-copy p+p {
    margin-top: 20px;
}

.research-link {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    margin-top: 28px;
    color: var(--color-primary);
    font-weight: 700;
    text-decoration: none;
}

.research-link:hover {
    color: var(--color-primary-dark);
}

.research-visual {
    display: none;
}
/* ---------- Acknowledgments ---------- */

.acknowledgments {
    padding: 90px 0;
    background: var(--color-surface);
}

.ack-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 22px;
}

.ack-card {
    padding: 30px;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    background: var(--color-bg);
}

.ack-card h3 {
    margin: 0;
    font-size: 18px;
}

.ack-card p {
    margin: 10px 0 0;
    color: var(--color-text-soft);
    font-size: 14px;
}

.ack-card a {
    color: var(--color-primary);
    font-weight: 650;
    text-decoration-thickness: 1px;
    text-underline-offset: 3px;
}


/* ---------- Closing CTA ---------- */

.closing-cta {
    padding: 105px 0;
    background:
        radial-gradient(circle at 50% 0%,
            rgba(216, 168, 78, 0.14),
            transparent 35%),
        var(--color-bg);
}

.closing-cta-inner {
    max-width: 780px;
    margin-inline: auto;
    text-align: center;
}

.closing-cta h2 {
    margin: 0;
    font-size: clamp(35px, 5vw, 54px);
    line-height: 1.08;
    letter-spacing: -0.045em;
}

.closing-cta p {
    margin: 20px auto 0;
    color: var(--color-text-soft);
    font-size: 18px;
}

.closing-cta .button {
    margin-top: 30px;
}


/* ---------- Footer ---------- */


.site-footer {
    padding: 56px 0 34px;
    border-top: 1px solid var(--color-border);
    background: var(--color-bg);
}

.footer-container {
    display: grid;
    grid-template-columns: auto 1fr auto;
    align-items: center;
    gap: 28px;
}

.footer-brand {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    color: var(--color-text);
    font-weight: 750;
    letter-spacing: -0.02em;
}

.footer-brand .brand-mark {
    width: 32px;
    height: 32px;
    border-radius: 9px;
    font-size: 16px;
}

.footer-info p {
    margin: 0;
    color: var(--color-text-muted);
    font-size: 13px;
    line-height: 1.5;
}

.footer-contact {
    margin-top: 10px !important;
}

.footer-contact a {
    color: inherit;
    text-decoration: underline;
    text-underline-offset: 3px;
}


.back-to-top {
    color: var(--color-text-soft);
    font-size: 13px;
    font-weight: 600;
    text-decoration: none;
    white-space: nowrap;
}

.back-to-top:hover {
    color: var(--color-primary);
}

@media (max-width: 700px) {
    .footer-container {
        grid-template-columns: 1fr;
        gap: 16px;
    }

    .back-to-top {
        justify-self: start;
    }
}

/* ---------- Utility classes ---------- */

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

.text-primary {
    color: var(--color-primary);
}

.muted {
    color: var(--color-text-muted);
}

.spacer-sm {
    height: 20px;
}

.spacer-md {
    height: 40px;
}


/* ---------- Responsive: tablet ---------- */

@media (max-width: 960px) {
    .hero {
        padding: 82px 0 72px;
    }

    .hero-inner {
        grid-template-columns: 1fr;
        gap: 48px;
    }

    .hero-visual {
        max-width: 680px;
    }

    .feature-grid {
        grid-template-columns: 1fr 1fr;
    }
    
    .feature-card:nth-child(3),
    .feature-card:last-child {
        grid-column: 1 / -1;
    }

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

    .research-card {
        grid-template-columns: 1fr;
        gap: 30px;
    }
}


/* ---------- Responsive: mobile ---------- */

@media (max-width: 700px) {

    .container,
    .container--narrow {
        width: min(calc(100% - 28px), var(--max-width));
    }

    .nav {
        min-height: 64px;
    }

    .nav-links {
        display: none;
    }

    .brand-name {
        font-size: 19px;
    }

    .hero {
        padding: 66px 0 58px;
    }

    .hero h1 {
        font-size: clamp(39px, 12vw, 58px);
    }

    .hero-tagline {
        font-size: 18px;
    }

    .hero-actions {
        align-items: stretch;
        flex-direction: column;
    }

    .hero-actions .button {
        width: 100%;
    }

    .hero-card {
        padding: 20px;
        border-radius: 20px;
    }

    .section {
        padding: 72px 0;
    }

    .section-heading {
        margin-bottom: 36px;
    }

    .section-heading p {
        font-size: 16px;
    }

    .core-message {
        padding: 72px 0;
    }

    .core-message p {
        font-size: 16px;
    }

    .feature-grid,
    .demo-highlights,
    .workflow,
    .ack-grid {
        grid-template-columns: 1fr;
    }

    .feature-card:last-child {
        grid-column: auto;
    }

    .demo-section {
        padding: 72px 0;
    }

    .demo-preview {
        border-radius: 20px;
    }

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

    .demo-sidebar {
        display: none;
    }

    .demo-main {
        min-height: 420px;
        padding: 34px 25px;
    }

    @media (max-width: 700px) {
        .video-wrapper {
            width: 100%;
            margin-top: 28px;
        }

        .demo-video {
            border-radius: 14px;
        }   }

    .research-card {
        padding: 28px 24px;
        border-radius: 20px;
    }

    .research-abstract {
        padding: 22px;
    }

    .acknowledgments {
        padding: 72px 0;
    }

    .closing-cta {
        padding: 76px 0;
    }

}


/* ---------- Reduced motion ---------- */

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

    *,
    *::before,
    *::after {
        transition: none !important;
    }

    .button:hover {
        transform: none;
    }
}

.cta-principles {
    max-width: none;
    font-size: clamp(24px, 3vw, 38px);
    line-height: 1.2;
    letter-spacing: -0.035em;
    white-space: nowrap;
}

.cta-principles span {
    color: var(--color-primary);
}

/* ---------- Hero actions ---------- */

.primary-button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 9px;
    min-height: 54px;
    padding: 15px 25px;
    border-radius: 999px;
    background: var(--color-primary);
    color: #fff;
    font-size: 16px;
    font-weight: 700;
    text-decoration: none;
    box-shadow: 0 10px 24px rgba(23, 107, 93, 0.18);
    transition:
        transform var(--transition),
        background var(--transition),
        box-shadow var(--transition);
}

.primary-button:hover {
    transform: translateY(-2px);
    background: var(--color-primary-dark);
    box-shadow: 0 14px 30px rgba(23, 107, 93, 0.23);
}

.hero-actions .text-link {
    font-size: 15px;
    font-weight: 650;
}


@media (max-width: 640px) {
    .cta-principles {
        white-space: normal;
        font-size: 28px;
    }
}