/* ══════════════════════════════════════════════
   Ditto Research — Swiss design system
   Type scale (Major Third ×1.25, base 16):
     11 / 13 / 16 / 20 / 25 / 64
   Spacing (8pt grid):
     8 / 16 / 24 / 32 / 40 / 48 / 64 / 80 / 96 / 120
   ══════════════════════════════════════════════ */

/* ── Tokens ── */
:root {
    --color-bg:             #ffffff;
    --color-bg-inverse:     #0a0a0a;
    --color-text:           #0a0a0a;
    --color-text-secondary: #666666;
    --color-text-tertiary:  #999999;
    --color-text-inverse:   #ffffff;
    --color-border:         rgba(10, 10, 10, 0.12);
    --color-border-hover:   rgba(10, 10, 10, 0.35);
    --color-border-inverse: rgba(255, 255, 255, 0.12);
    --color-surface:        #f5f5f5;

    --container-max: 1440px;
    --container-pad: clamp(24px, 5.5vw, 80px);
    --hero-text-max: 720px;

    --radius-sm:   6px;
    --radius-md:   12px;
    --radius-lg:   16px;
    --radius-pill: 999px;
}

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

html, body {
    background: var(--color-bg);
    color: var(--color-text);
    font-family: 'Inter', -apple-system, system-ui, sans-serif;
    font-size: 16px;
    line-height: 1.6;
    letter-spacing: -0.05em;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    font-feature-settings: 'cv11', 'ss01';
}

body {
}

button {
    font-family: inherit;
    cursor: pointer;
    border: none;
    background: none;
    color: inherit;
}

a {
    color: inherit;
    text-decoration: none;
}

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

/* ══════════════════════════════════════════════
   NAV
   Three-column grid: logo | links | actions
   Logo and actions share equal 1fr so links
   sit at the geometric viewport centre.
   ══════════════════════════════════════════════ */
.nav {
    padding: 24px 0;
    position: sticky;
    top: 0;
    z-index: 100;
    background-color: var(--color-bg);
    transition: padding 0.25s ease, border-color 0.25s ease;
    border-bottom: 1px solid transparent;
}

.nav.scrolled {
    padding: 12px 0;
    border-bottom-color: var(--color-border);
}

.nav-inner {
    display: grid;
    grid-template-columns: 1fr auto 1fr;
    align-items: center;
    height: 48px;
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: 5px;
    font-size: 20px;
    font-weight: 500;
    justify-self: start;
}

.nav-brand-ditto {
    font-weight: 600;
}

.nav-brand-research {
    font-weight: 400;
}

.nav-brand-logo {
    height: 20px;
    width: auto;
    display: block;
}

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

/* "Coming soon" tooltip on nav links */
.nav-link {
    position: relative;
    font-size: 13px;
    font-weight: 400;
    color: var(--color-text);
    transition: opacity 0.15s ease;
    cursor: default;
}

.nav-link::after {
    content: 'Coming soon';
    position: absolute;
    top: calc(100% + 10px);
    left: 50%;
    transform: translateX(-50%) translateY(-4px);
    background: var(--color-text);
    color: var(--color-text-inverse);
    font-size: 11px;
    font-weight: 500;
    letter-spacing: 0.04em;
    text-transform: uppercase;
    padding: 5px 10px;
    border-radius: var(--radius-sm);
    white-space: nowrap;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.15s ease, transform 0.15s ease;
}

.nav-link:hover {
    opacity: 0.6;
}

.nav-link:hover::after {
    opacity: 1;
    transform: translateX(-50%) translateY(0);
}

.nav-actions {
    display: flex;
    align-items: center;
    gap: 8px;
    justify-self: end;
}

/* ── Buttons ── */
.btn {
    font-size: 13px;
    font-weight: 500;
    line-height: 1;
    padding: 10px 20px;
    border-radius: var(--radius-pill);
    transition: opacity 0.15s ease, border-color 0.15s ease;
    white-space: nowrap;
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

.btn-ghost {
    background: transparent;
    border: 1px solid rgba(10, 10, 10, 0.22);
    color: var(--color-text);
}

.btn-ghost:hover {
    border-color: rgba(10, 10, 10, 0.50);
}

.btn-primary {
    background: var(--color-text);
    color: var(--color-text-inverse);
    border: 1px solid var(--color-text);
}

.btn-primary:hover {
    opacity: 0.82;
}

/* Hero CTAs: same font, larger internal space = visual weight */
.btn-lg {
    padding: 14px 32px;
    font-size: 15px;
}

/* Text-link CTA — no border/bg, just label + arrow */
.btn-link {
    font-size: 15px;
    font-weight: 500;
    color: var(--color-text-secondary);
    background: none;
    border: none;
    padding: 0;
    display: inline-flex;
    align-items: center;
    gap: 6px;
    transition: color 0.15s ease;
    text-decoration: none;
}

.btn-link::after {
    content: '→';
    display: inline-block;
    transition: transform 0.15s ease;
}

.btn-link:hover {
    color: var(--color-text);
}

.btn-link:hover::after {
    transform: translateX(3px);
}

/* ══════════════════════════════════════════════
   HERO
   ══════════════════════════════════════════════ */
.hero {
    padding-top: 104px;
    padding-bottom: 80px;
}

.hero-text {
    max-width: var(--hero-text-max);
    margin: 0 auto;
    text-align: center;
}

.hero-headline {
    font-size: clamp(40px, 5.5vw, 64px);
    font-weight: 600;
    line-height: 1.0;
    letter-spacing: -0.05em;
    color: var(--color-text);
}

.hero-sub {
    font-size: 18px;
    font-weight: 400;
    line-height: 1.5;
    color: var(--color-text-secondary);
    margin-top: 20px;
}

.hero-actions {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 20px;
    margin-top: 36px;
}

/* ══════════════════════════════════════════════
   DEMO WINDOW
   Mini UI rendered in-page.
   Left: visual canvas + prompt card
   Right: live SVG code output
   ══════════════════════════════════════════════ */
.demo {
    padding-bottom: 96px;
}

.demo-window {
    width: 100%;
    border: 1px solid black;
    border-radius: var(--radius-lg);
    background: var(--color-bg);
    overflow: hidden;
}

.demo-titlebar {
    position: relative;
    height: 40px;
    border-bottom: 0.5px solid var(--color-border);
    display: flex;
    align-items: center;
    padding: 0 16px;
}



.demo-body {
    display: grid;
    grid-template-columns: 1.4fr 1fr;
    min-height: 560px;
}

.demo-visual {
    position: relative;
    padding: 24px;
    display: flex;
    flex-direction: column;
    justify-content: flex-end;
    background: var(--color-bg);
    border-right: 0.5px solid var(--color-border);
}

.demo-visual-img {
    position: absolute;
    inset: 24px 24px 168px 24px;
    display: flex;
    align-items: center;
    justify-content: center;
}

/* Base image — or the inline SVG that JS swaps it for */
.demo-visual-img img,
.demo-visual-img svg {
    max-width: 100%;
    max-height: 100%;
    display: block;
}

.demo-prompt-card {
    position: relative;
    background: var(--color-bg);
    border: 0.5px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: 16px;
    box-shadow: 0 1px 2px rgba(0, 0, 0, 0.03);
}

.demo-prompt-input {
    font-size: 13px;
    font-weight: 400;
    color: var(--color-text);
    letter-spacing: -0.05em;
    min-height: 20px;
}

.demo-prompt-footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-top: 16px;
}

.demo-model {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-size: 11px;
    font-weight: 500;
    color: var(--color-text-secondary);
    border: 0.5px solid var(--color-border);
    border-radius: var(--radius-sm);
    padding: 5px 8px;
}


.demo-prompt-actions {
    display: flex;
    align-items: center;
    gap: 8px;
}

.demo-icon-btn {
    width: 28px;
    height: 28px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-sm);
    border: 0.5px solid var(--color-border);
    color: var(--color-text-secondary);
    transition: border-color 0.15s ease, color 0.15s ease;
}

.demo-icon-btn:hover {
    border-color: var(--color-border-hover);
    color: var(--color-text);
}

.demo-icon-btn.primary {
    background: var(--color-text);
    color: var(--color-text-inverse);
    border-color: var(--color-text);
    border-radius: var(--radius-sm);
}

.demo-icon-btn.primary:hover {
    opacity: 0.82;
}

.demo-icon-btn svg {
    width: 13px;
    height: 13px;
    display: block;
}

.demo-replay-btn {
    background: none;
    border: none;
    cursor: pointer;
    color: var(--color-text-tertiary);
    padding: 0;
    font-family: inherit;
    font-size: 13px;
    font-weight: 500;
    letter-spacing: -0.05em;
    line-height: 1;
    transition: color 0.15s ease;
}

.demo-replay-btn:hover {
    color: var(--color-text-secondary);
}

.demo-code {
    background: #fafafa;
    padding: 16px 24px;
    font-family: 'JetBrains Mono', ui-monospace, SFMono-Regular, Menlo, monospace;
    font-size: 13px;
    line-height: 1.7;
    letter-spacing: 0;
    color: var(--color-text);
    overflow-y: auto;
    min-height: 0;      /* lets the grid item shrink below its content height */
    scrollbar-width: thin;
    scrollbar-color: var(--color-border) transparent;
}


.demo-code-line {
    display: flex;
    gap: 16px;
    white-space: nowrap;
}

.demo-code-ln {
    color: var(--color-text-tertiary);
    user-select: none;
    width: 14px;
    text-align: right;
    flex-shrink: 0;
}

.demo-code .tok-tag  { color: #0a0a0a; font-weight: 500; }
.demo-code .tok-attr { color: var(--color-text-secondary); }
.demo-code .tok-str  { color: #0a0a0a; }
.demo-code .tok-cmt  { color: var(--color-text-tertiary); }

/* ══════════════════════════════════════════════
   FEATURES — 2×2 grid, diagonal W/B/B/W
   Visual zone: 360px (golden ratio of card width)
   Caption: 32px padding all sides
   ══════════════════════════════════════════════ */
.features {
    border-top: 0.5px solid var(--color-border);
    padding-top: 48px;
    padding-bottom: 96px;
}

.features-eyebrow {
    font-size: 11px;
    font-weight: 500;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--color-text-tertiary);
    margin-bottom: 48px;
}

.features-grid {
    display: grid;
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    gap: 24px;
}

.feature-card {
    min-height: 512px;
    display: flex;
    flex-direction: column;
    border: 1px solid black;
    border-radius: var(--radius-md);
    overflow: hidden;
    transition: border-color 0.2s ease;
}

.feature-card:hover {
    border-color: var(--color-border-hover);
}

.feature-card.dark {
    background: var(--color-bg-inverse);
    border-color: var(--color-border-inverse);
    color: var(--color-text-inverse);
}

.feature-card.dark:hover {
    border-color: rgba(255, 255, 255, 0.35);
}

.feature-card.light {
    background: var(--color-surface);
}

.feature-visual {
    height: 360px;
    flex-shrink: 0;
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    padding: 48px;
}

/* All images rendered at the same contained size — Swiss grid discipline.
   The img itself fills a fixed square zone; object-fit handles aspect ratio. */
.feature-visual img,
.feature-visual svg {
    width: 200px;
    height: 200px;
    object-fit: contain;
    display: block;
    flex-shrink: 0;
    overflow: visible;
}

/* Swiss color discipline: non-bouquet SVGs rendered monochrome.
   On light cards → black (already black for dittologo, invert for stackedshapes).
   On dark cards  → white (invert + brightness for typographyexample). */
.feature-visual img.swiss-invert {
    filter: brightness(0);
}

.feature-visual img.swiss-invert-white {
    filter: brightness(0) invert(1);
}

/* Animations card — pendulum-chain balance
   Physics: diamond is the base pivot (bottom vertex).
   Triangle counter-leans to compensate. Circle rolls
   with the most reactivity, adding a slight lateral drift.
   All share one period; phase offsets simulate inertial lag
   up the chain (each piece "catches up" to the one below). */
.anim-card-svg path {
    fill: black;
}

.anim-card-svg .shape-diamond {
    transform-box: fill-box;
    transform-origin: center bottom;
    animation: balance-base 5s cubic-bezier(0.45, 0.05, 0.55, 0.95) infinite;
}

.anim-card-svg .shape-triangle {
    transform-box: fill-box;
    transform-origin: center bottom;
    animation: balance-mid 5s cubic-bezier(0.45, 0.05, 0.55, 0.95) infinite;
    animation-delay: -0.25s;
}

.anim-card-svg .shape-circle {
    transform-box: fill-box;
    transform-origin: center;
    animation: balance-top 5s cubic-bezier(0.45, 0.05, 0.55, 0.95) infinite;
    animation-delay: -0.5s;
}

/* Diamond: heavy base, anchored tilt */
@keyframes balance-base {
    0%, 100% { transform: rotate(0deg);   }
    50%       { transform: rotate(6deg);  }
}

/* Triangle: counter-leans hard to compensate */
@keyframes balance-mid {
    0%, 100% { transform: rotate(0deg);    }
    50%       { transform: rotate(-9deg);  }
}

/* Circle: most reactive — big roll with lateral drift */
@keyframes balance-top {
    0%, 100% { transform: rotate(0deg)     translateX(0px);   }
    25%       { transform: rotate(13deg)   translateX(8px);   }
    75%       { transform: rotate(-13deg)  translateX(-8px);  }
}

.feature-caption {
    flex: 1;
    padding: 32px;
    border-top: 0.5px solid var(--color-border);
}

.feature-card.dark .feature-caption {
    border-top-color: var(--color-border-inverse);
}

.feature-headline {
    font-size: 16px;
    font-weight: 500;
    line-height: 1.2;
}

.feature-body {
    font-size: 13px;
    font-weight: 400;
    line-height: 1.6;
    color: var(--color-text-secondary);
    margin-top: 8px;
    max-width: 48ch;
}

.feature-card.dark .feature-body {
    color: rgba(255, 255, 255, 0.55);
}

/* ══════════════════════════════════════════════
   FOOTER
   ══════════════════════════════════════════════ */
.footer {
    border-top: 0.5px solid var(--color-border);
    padding: 32px 0;
}

.footer-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 24px;
    font-size: 13px;
    font-weight: 400;
    color: var(--color-text-secondary);
    letter-spacing: -0.05em;
}

.footer-inner > * {
    flex: 1;
}

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

/* ══════════════════════════════════════════════
   RESPONSIVE — desktop-first
   Tablet: ≤1024px  |  Mobile: ≤640px
   ══════════════════════════════════════════════ */

/* ── Tablet ── */
@media (max-width: 1024px) {
    .hero {
        padding-top: 96px;
        padding-bottom: 80px;
    }
    .features-grid {
        grid-template-columns: 1fr;
        gap: 16px;
    }
    .feature-visual {
        height: 280px;
    }
    .feature-card {
        min-height: 0;
    }
    .demo-body {
        grid-template-columns: 1fr 1fr;
        min-height: 460px;
    }
}

/* ── Mobile ── */
@media (max-width: 640px) {
    /* Nav collapses to logo + primary CTA */
    .nav-inner {
        grid-template-columns: 1fr auto;
    }
    .nav-links {
        display: none;
    }
    .nav-actions .btn-ghost {
        display: none;
    }

    /* Hero */
    .hero {
        padding-top: 56px;
        padding-bottom: 56px;
    }
    .hero-sub {
        font-size: 16px;
        margin-top: 16px;
    }
    .hero-actions {
        flex-direction: column;
        align-items: stretch;
        gap: 10px;
        margin-top: 28px;
    }
    .btn-lg {
        width: 100%;
        text-align: center;
        justify-content: center;
        padding: 16px 24px;
    }

    /* Demo window */
    .demo {
        padding-bottom: 64px;
    }
    .demo-body {
        grid-template-columns: 1fr;
        min-height: 0;
    }
    .demo-visual {
        border-right: none;
        border-bottom: 0.5px solid var(--color-border);
        min-height: 340px;
        padding: 20px;
    }
    .demo-visual-img {
        inset: 16px 16px 136px 16px;
    }
    .demo-prompt-card {
        padding: 14px;
    }
    .demo-prompt-footer {
        margin-top: 12px;
    }
    .demo-code {
        max-height: 260px;
        overflow-y: auto;
        font-size: 12px;
        padding: 14px 16px;
    }
    .demo-code-line {
        gap: 12px;
    }

    /* Cards single-column, checkerboard: light/dark/light/dark */
    .features-grid {
        grid-template-columns: 1fr;
        gap: 16px;
    }
    .feature-visual {
        height: 240px;
    }
    /* Card 3: dark → light */
    .features-grid .feature-card:nth-child(3) {
        background: var(--color-bg);
        border-color: black;
        color: var(--color-text);
    }
    .features-grid .feature-card:nth-child(3) .feature-caption {
        border-top-color: var(--color-border);
    }
    .features-grid .feature-card:nth-child(3) .feature-body {
        color: var(--color-text-secondary);
    }
    /* Card 4: light → dark */
    .features-grid .feature-card:nth-child(4) {
        background: var(--color-bg-inverse);
        border-color: var(--color-border-inverse);
        color: var(--color-text-inverse);
    }
    .features-grid .feature-card:nth-child(4) .feature-caption {
        border-top-color: var(--color-border-inverse);
    }
    .features-grid .feature-card:nth-child(4) .feature-body {
        color: rgba(255, 255, 255, 0.55);
    }
    .features-grid .feature-card:nth-child(4) .anim-card-svg path {
        fill: white;
    }

    /* Footer stacks */
    .footer-inner {
        flex-direction: column;
        align-items: flex-start;
        gap: 8px;
    }
    .footer-inner > * {
        text-align: left;
        flex: none;
    }
}