/*
 * Design system: "transparence nacrée" (aidd_docs/DESIGN_SYSTEM.md).
 * No build step, no external font host — fonts are self-hosted woff2 under /fonts.
 */

@font-face {
    font-family: "IBM Plex Sans";
    font-style: normal;
    font-weight: 400;
    font-display: swap;
    src: url("/fonts/ibm-plex-sans/ibm-plex-sans-400.woff2") format("woff2");
}

@font-face {
    font-family: "IBM Plex Sans";
    font-style: normal;
    font-weight: 600;
    font-display: swap;
    src: url("/fonts/ibm-plex-sans/ibm-plex-sans-600.woff2") format("woff2");
}

@font-face {
    font-family: "IBM Plex Serif";
    font-style: normal;
    font-weight: 600;
    font-display: swap;
    src: url("/fonts/ibm-plex-serif/ibm-plex-serif-600.woff2") format("woff2");
}

@font-face {
    font-family: "IBM Plex Mono";
    font-style: normal;
    font-weight: 400;
    font-display: swap;
    src: url("/fonts/ibm-plex-mono/ibm-plex-mono-400.woff2") format("woff2");
}

@font-face {
    font-family: "IBM Plex Mono";
    font-style: normal;
    font-weight: 500;
    font-display: swap;
    src: url("/fonts/ibm-plex-mono/ibm-plex-mono-500.woff2") format("woff2");
}

:root {
    /* Colors — light (default) */
    --ground: #F7FAF0;
    --surface: #EDF1F7;
    --surface-2: #E2E7EF;
    --ink: #1C1B27;
    --muted: #6B6878;
    --line: #D7DCE7;
    --accent: #3FCBDA;
    --accent-strong: #85F5FF;
    --accent-2: #9EB7E5;
    --on-accent: #0E2226;
    --mark: #995D81;
    --cta: #7B4FA6;
    --cta-strong: #C7A0EA;
    --on-cta: #F7FAF0;
    --focus: #5C7FC2;

    --sheen:
        radial-gradient(ellipse at top left, color-mix(in srgb, var(--accent) 20%, transparent), transparent 55%),
        radial-gradient(ellipse at top right, color-mix(in srgb, var(--accent-2) 25%, transparent), transparent 55%),
        radial-gradient(ellipse at bottom right, color-mix(in srgb, var(--mark) 15%, transparent), transparent 60%);
    --hazard: linear-gradient(90deg, var(--accent-strong), var(--accent-2) 45%, var(--mark) 85%);

    /* Typography */
    --font-display: "IBM Plex Serif", Georgia, serif;
    --font-body: "IBM Plex Sans", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    --font-mono: "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, monospace;

    --fs-caption: clamp(0.64rem, 0.6rem + 0.2vw, 0.72rem);
    --fs-meta: clamp(0.78rem, 0.74rem + 0.15vw, 0.86rem);
    --fs-body: 1rem;
    --fs-lead: clamp(0.95rem, 0.92rem + 0.1vw, 1.02rem);
    --fs-hero-subtitle: clamp(1.05rem, 0.9rem + 0.6vw, 1.3rem);
    --fs-h3: 1.15rem;
    --fs-grievance: 1.28rem;
    --fs-h1: clamp(2.6rem, 1rem + 5.4vw, 4.6rem);
    --fs-h2: clamp(1.7rem, 1.3rem + 2vw, 2.2rem);

    /* Spacing & grid */
    --max-width: 74rem;
    --measure: 38rem;
    --space-2: 0.5rem;
    --space-3: 1rem;
    --space-4: 1.5rem;
    --space-6: 3rem;
}

@media (prefers-color-scheme: dark) {
    :root {
        --ground: #0D1220;
        --surface: #151B2E;
        --surface-2: #090C15;
        --ink: #F3F5FB;
        --muted: #939AB8;
        --line: #262D45;
        --accent: #69E4F0;
        --accent-strong: #8FF7FF;
        --accent-2: #AEC3EE;
        --on-accent: #08181B;
        --mark: #CE93B7;
        --cta: #9A6FCB;
        --cta-strong: #DBC0F2;
        --on-cta: #180C22;
        --focus: #8FB2EE;
    }
}

:root[data-theme="light"] {
    --ground: #F7FAF0;
    --surface: #EDF1F7;
    --surface-2: #E2E7EF;
    --ink: #1C1B27;
    --muted: #6B6878;
    --line: #D7DCE7;
    --accent: #3FCBDA;
    --accent-strong: #85F5FF;
    --accent-2: #9EB7E5;
    --on-accent: #0E2226;
    --mark: #995D81;
    --cta: #7B4FA6;
    --cta-strong: #C7A0EA;
    --on-cta: #F7FAF0;
    --focus: #5C7FC2;
}

:root[data-theme="dark"] {
    --ground: #0D1220;
    --surface: #151B2E;
    --surface-2: #090C15;
    --ink: #F3F5FB;
    --muted: #939AB8;
    --line: #262D45;
    --accent: #69E4F0;
    --accent-strong: #8FF7FF;
    --accent-2: #AEC3EE;
    --on-accent: #08181B;
    --mark: #CE93B7;
    --cta: #9A6FCB;
    --cta-strong: #DBC0F2;
    --on-cta: #180C22;
    --focus: #8FB2EE;
}

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

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

body {
    margin: 0;
    font-family: var(--font-body);
    font-weight: 400;
    line-height: 1.5;
    color: var(--ink);
    background-color: var(--ground);
    background-image: var(--sheen);
    background-attachment: fixed;
}

::selection {
    background-color: var(--accent);
    color: var(--on-accent);
}

a {
    color: var(--ink);
}

:focus-visible {
    outline: 2px solid var(--focus);
    outline-offset: 3px;
}

.container {
    max-width: var(--max-width);
    margin-inline: auto;
    padding-inline: var(--space-4);
}

/* Nav */
.site-header {
    position: sticky;
    top: 0;
    z-index: 10;
    background-color: color-mix(in srgb, var(--ground) 80%, transparent);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--line);
}

.site-nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    max-width: var(--max-width);
    margin-inline: auto;
    padding: var(--space-3) var(--space-4);
    font-family: var(--font-mono);
    text-transform: uppercase;
    font-size: var(--fs-meta);
    letter-spacing: 0.02em;
}

.site-nav__brand {
    font-weight: 600;
    text-decoration: none;
    color: var(--ink);
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
}

.brand-mark {
    width: 1.05rem;
    height: 1.05rem;
    border: 1.4px solid var(--ink);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 0.6rem;
    transform: rotate(45deg);
    flex: none;
}

.brand-mark span {
    transform: rotate(-45deg);
}

.site-nav__list {
    display: flex;
    gap: var(--space-4);
    list-style: none;
    margin: 0;
    padding: 0;
}

.site-nav__list a {
    text-decoration: none;
    color: var(--ink);
    border-bottom: 2px solid transparent;
    padding-bottom: 0.2em;
    transition: border-color 0.15s;
}

.site-nav__list a:hover,
.site-nav__list a:focus-visible {
    border-color: var(--accent);
}

@media (max-width: 760px) {
    .site-nav__list {
        display: none;
    }
}

main {
    max-width: var(--max-width);
    margin-inline: auto;
    padding: 0 var(--space-4);
}

.site-footer {
    border-top: 1px solid var(--line);
    color: var(--muted);
    font-family: var(--font-mono);
    font-size: var(--fs-caption);
}

.site-footer__inner {
    max-width: var(--max-width);
    margin-inline: auto;
    padding: var(--space-4);
    display: flex;
    gap: var(--space-4);
}

.site-footer a {
    color: var(--muted);
}

.site-footer__certifications {
    max-width: var(--max-width);
    margin-inline: auto;
    padding: var(--space-4) var(--space-4) 0;
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: var(--space-4);
}

.site-footer__certifications img,
.site-footer__certifications svg {
    max-height: 2.5rem;
    width: auto;
}

/* Section layout: rail | content */
section {
    padding: 5rem 1.5rem;
}

section + section {
    border-top: 1px solid var(--line);
}

.section__content h2,
.pain h2,
.offers h2,
.way-of-working h2,
.proof h2 {
    font-family: var(--font-display);
    font-weight: 600;
    font-size: var(--fs-h2);
    margin-top: 0;
}

.has-photo-left {
    display: grid;
    grid-template-columns: clamp(8rem, 22vw, 15rem) 1fr;
    gap: 2.5rem;
}

.has-photo-right {
    display: grid;
    grid-template-columns: 1fr clamp(8rem, 22vw, 15rem);
    gap: 2.5rem;
}

@media (max-width: 800px) {
    section {
        padding: 3.5rem 1.25rem;
    }
}

/* Hero */
.hero {
    display: grid;
    grid-template-columns: 1fr clamp(9rem, 24vw, 17rem);
    gap: 2.5rem;
    text-align: left;
}

@media (max-width: 800px) {
    .hero {
        grid-template-columns: 1fr;
    }
}

.hero__copy {
    max-width: var(--measure);
}

.hero__copy h1 {
    font-family: var(--font-display);
    font-weight: 600;
    font-size: var(--fs-h1);
    line-height: 1.05;
    margin: 0 0 var(--space-4);
}

.hero__subtitle {
    font-family: var(--font-display);
    font-style: italic;
    font-size: var(--fs-hero-subtitle);
    color: var(--muted);
    margin: 0 0 var(--space-4);
}

/* CTA ("stamp-btn") — single component, hero + final, identical */
.cta {
    display: inline-flex;
    align-items: center;
    gap: 0.4em;
    margin-top: var(--space-4);
    padding: var(--space-3) var(--space-4);
    background: linear-gradient(135deg, var(--cta-strong), var(--cta));
    color: var(--on-cta);
    text-decoration: none;
    border: 1px solid var(--cta);
    border-radius: 0.25rem;
    font-family: var(--font-mono);
    text-transform: uppercase;
    font-weight: 600;
    font-size: var(--fs-meta);
    box-shadow: 0 0 0.75rem color-mix(in srgb, var(--cta) 45%, transparent);
    transition: transform 0.15s, box-shadow 0.15s;
}

.cta::before {
    content: "§";
    opacity: 0.7;
}

.cta:hover,
.cta:focus-visible {
    transform: translateY(-2px);
    box-shadow: 0 0 1.25rem color-mix(in srgb, var(--cta) 65%, transparent);
}

/* Grievance (pain quote) */
.pain__item {
    border-left: 7px solid var(--mark);
    padding-left: var(--space-4);
    margin-block: var(--space-4);
}

.pain__quote {
    font-family: var(--font-display);
    font-weight: 600;
    font-size: var(--fs-grievance);
    color: var(--mark);
    margin: 0 0 0.4em;
}

.pain__body {
    color: var(--muted);
    margin: 0;
}

/* Reversal mark — underline-only emphasis */
.reversal strong {
    font-weight: inherit;
    text-decoration: underline;
    text-decoration-color: var(--accent);
    text-decoration-thickness: 2px;
    text-underline-offset: 0.15em;
}

/* Offer card */
.offers__grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-4);
}

.offers__item {
    border: 2px solid var(--ink);
    border-radius: 0.25rem;
    padding: var(--space-4);
}

.offers__kicker {
    display: inline-block;
    background-color: var(--accent);
    color: var(--on-accent);
    font-family: var(--font-mono);
    text-transform: uppercase;
    font-size: var(--fs-caption);
    padding: 0.15em 0.6em;
    border-radius: 999px;
    margin-bottom: var(--space-3);
}

.offers__lead {
    font-size: var(--fs-lead);
}

@media (max-width: 800px) {
    .offers__grid {
        grid-template-columns: 1fr;
    }
}

/* Way of working */
.way-of-working__list {
    list-style: none;
    margin: 0;
    padding: 0;
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
}

.way-of-working__list li {
    padding-left: var(--space-4);
    border-left: 2px solid var(--line);
}

/* Case row (proof) */
.proof__item {
    display: flex;
    align-items: flex-start;
    gap: var(--space-4);
    margin-block: var(--space-4);
}

.proof__item--reverse {
    flex-direction: row-reverse;
}

.proof__copy {
    border: 2px solid var(--ink);
    border-radius: 0.25rem;
    padding: var(--space-4);
    align-self: stretch;
    flex: 1;
}

.proof__photo {
    width: clamp(8rem, 22vw, 15rem);
    aspect-ratio: 4 / 5;
    border-radius: 0.25rem;
    align-self: flex-start;
    flex-shrink: 0;
}

@media (max-width: 700px) {
    .proof__item,
    .proof__item--reverse {
        flex-direction: column;
    }

    .proof__photo {
        width: 100%;
        aspect-ratio: 16 / 9;
    }
}

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

.founder {
    margin-top: var(--space-6);
    padding-top: var(--space-4);
    border-top: 1px solid var(--line);
    display: flex;
    align-items: flex-start;
    gap: var(--space-4);
}

.founder__photo {
    width: 6rem;
    height: 6rem;
    object-fit: cover;
    border-radius: 50%;
    flex-shrink: 0;
}

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

/* Hazard band — exactly twice: opening, before final CTA */
.hazard {
    height: 0.7rem;
    background: var(--hazard);
}

/* CTA final — no rail, bookend section */
.cta-final {
    grid-template-columns: 1fr;
    text-align: center;
}

.cta-final h2 {
    font-family: var(--font-display);
    font-weight: 600;
    font-size: var(--fs-h2);
}

.cta-final__photo {
    width: 100%;
    aspect-ratio: 21 / 8;
    margin-top: var(--space-4);
}

/* Photo placeholders — gradient box + camera mark + label, until a real asset is uploaded */
.photo {
    position: relative;
    overflow: hidden;
    border: 1px solid var(--line);
    border-radius: 0.25rem;
    min-height: 11rem;
}

.photo img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}

.photo-label {
    position: absolute;
    left: 0;
    right: 0;
    bottom: 0;
    font-family: var(--font-mono);
    font-size: var(--fs-caption);
    color: var(--ink);
    background-color: color-mix(in srgb, var(--ground) 72%, transparent);
    backdrop-filter: blur(4px);
    padding: 0.5rem 0.65rem;
    border-top: 1px solid var(--line);
}

.photo-mark {
    position: absolute;
    top: 0.65rem;
    right: 0.65rem;
    width: 1.6rem;
    height: 1.6rem;
    border-radius: 50%;
    border: 1px solid rgba(255, 255, 255, 0.55);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--on-accent);
    opacity: 0.85;
}

.photo-mark svg {
    width: 0.85rem;
    height: 0.85rem;
}

.photo--a {
    background: linear-gradient(150deg, var(--accent-strong), var(--accent-2) 75%);
}

.photo--b {
    background: linear-gradient(150deg, var(--accent-2), var(--mark) 80%);
}

.photo--c {
    background: linear-gradient(150deg, var(--mark), var(--accent-strong) 80%);
}

.photo--d {
    background: linear-gradient(160deg, var(--accent-strong), var(--surface-2) 85%);
}

.photo--e {
    background: linear-gradient(160deg, var(--mark), var(--surface-2) 85%);
}

.photo--f {
    background: linear-gradient(100deg, var(--accent-strong), var(--accent-2) 50%, var(--mark) 100%);
}

.hero__photo,
.pain__photo,
.offers__photo {
    align-self: start;
    aspect-ratio: 4 / 5;
    width: 100%;
}

@media (max-width: 800px) {
    .has-photo-left,
    .has-photo-right {
        grid-template-columns: 1fr;
    }

    .hero__photo,
    .pain__photo,
    .offers__photo {
        height: auto;
        aspect-ratio: 16 / 9;
    }
}

/* Contact form */
.contact-form {
    max-width: 32rem;
}

.form-field {
    margin-bottom: var(--space-4);
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
}

.form-field label {
    font-weight: 600;
}

.form-field input[type="text"],
.form-field input[type="email"],
.form-field textarea {
    font: inherit;
    padding: var(--space-2) var(--space-3);
    border: 1px solid var(--line);
    border-radius: 0.25rem;
    color: var(--ink);
    background-color: var(--ground);
}

.form-field--checkbox label {
    display: flex;
    align-items: flex-start;
    gap: var(--space-2);
    font-weight: 400;
}

.form-field--checkbox input[type="checkbox"] {
    margin-top: 0.2em;
}

.form-error {
    color: #b91c1c;
    font-size: 0.875rem;
}

.form-success {
    padding: var(--space-3) var(--space-4);
    margin-bottom: var(--space-4);
    border: 1px solid var(--accent);
    border-radius: 0.25rem;
    background-color: var(--surface);
    color: var(--ink);
}

/* Motion */
.reveal {
    opacity: 0;
    transform: translateY(10px);
    transition: opacity 0.4s ease-out, transform 0.4s ease-out;
}

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

@media (prefers-reduced-motion: reduce) {
    .reveal {
        opacity: 1;
        transform: none;
        transition: none;
    }

    .cta {
        transition: none;
    }
}