/* =====================================================
   atrio — Case Study
   Built from the Figma frame "atrio — Case Study" (1440 wide).
   The design is a stack of sections on a 60px margin
   (120px on the cover) with flexible columns, so this is
   a fluid layout rather than a fixed canvas.
   ===================================================== */

:root {
    --at-bg: #e2e0d8;
    --at-ink: #23281d;
    --at-muted: #575a4c;
    --at-body: #43473a;
    --at-rule: #a9ac94;
    --at-rule-light: #e4e5da;
    --at-clay: #c62828;
    --at-panel: #f5f4ee;
    --at-slot: #c0c2ab;
    --at-paid: #e7e8d5;
}

/* The page keeps the site background; only the case study itself
   carries the project's sage. */
body {
    background-color: rgb(245, 245, 245);
    font-family: "Inter", sans-serif;
    color: var(--at-ink);
    margin: 0;
    padding: 0;
}

/* The case study sits in the right-hand 80%, the same split
   manicpanic and kindle use. */
.at-main {
    width: 80%;
    margin-left: auto;
    margin-right: 0;
}

.at-page {
    max-width: 1440px;
    margin: 0 auto;
    background-color: var(--at-bg);
}

/* Left sidebar: home link + project description, in the gutter
   left of .at-main. */
.at-sidebar {
    position: fixed;
    left: 0;
    top: 60px;
    width: 20%;
    display: flex;
    flex-direction: column;
    gap: 16px;
    padding: 0 32px;
    box-sizing: border-box;
    font-family: sans-serif;
}

.at-sidebar-home {
    display: inline-block;
    width: fit-content;
    padding-bottom: 4px;
    border-bottom: 1px solid var(--at-ink);
    color: var(--at-ink);
    font-size: 16px;
    font-weight: 600;
    text-decoration: none;
}

.at-sidebar-home:hover {
    opacity: 0.6;
}

.at-sidebar-description {
    margin: 0;
    color: var(--at-body);
    font-size: 14px;
    font-weight: 400;
    line-height: 20px;
}

/* Tools, one per line, under the description. */
.at-sidebar-tools {
    margin: 32px 0 0;
    padding: 0;
    list-style: none;
    color: var(--at-ink);
    font-size: 14px;
    font-weight: 600;
    line-height: 20px;
}

.at-sidebar-tools li {
    font-weight: 600;
}

.at-sidebar-tools li + li {
    margin-top: 8px;
}

.at-section {
    padding: 60px;
}

/* =====================
   Type roles
   ===================== */

.at-eyebrow {
    font-size: 16px;
    font-weight: 500;
    letter-spacing: 1.28px;
    color: var(--at-muted);
}

.at-label {
    font-size: 20px;
    font-weight: 500;
    letter-spacing: 1.6px;
    color: var(--at-muted);
}

.at-h2 {
    max-width: 1000px;
    font-size: 46px;
    font-weight: 600;
    line-height: 1.2;
    letter-spacing: -0.69px;
    color: var(--at-ink);
}

.at-lede {
    max-width: 820px;
    font-size: 22px;
    font-weight: 400;
    line-height: 1.6;
    color: var(--at-body);
}

.at-body {
    font-size: 16px;
    font-weight: 400;
    line-height: 1.65;
    color: var(--at-body);
}

.at-note {
    font-size: 16px;
    font-weight: 400;
    line-height: 1.6;
    color: var(--at-muted);
}

/* Rhythm. The Figma file spaces sections with named spacer
   frames; those heights become margins here. */
.at-section > .at-eyebrow { margin-top: 64px; }
.at-section > .at-h2 { margin-top: 40px; }
.at-section > .at-lede { margin-top: 24px; }

/* A major block break. Listed after the rules above so it wins on an
   eyebrow that also opens a block. */
.at-block,
.at-section > .at-block { margin-top: 96px; }

.at-rule {
    height: 2px;
    background-color: var(--at-ink);
}

.at-hairline {
    height: 1px;
    background-color: var(--at-rule);
}

/* =====================
   00 Cover
   ===================== */

/* The cover and overview frames are fixed height in Figma, so their
   bottom margin is not the nominal padding. These are the real gaps. */
.at-cover {
    padding: 99px 120px 98px;
}

.at-section--overview {
    padding-bottom: 40px;
}

.at-cover-head {
    display: flex;
    align-items: center;
    gap: 393px;
    margin-top: 40px;
}

.at-logo {
    position: relative;
    flex-shrink: 0;
    width: 247.138px;
    aspect-ratio: 247.138 / 218.954;
}

.at-logo img {
    position: absolute;
    display: block;
}

.at-logo-arch {
    left: 0.619%;
    top: 0;
    width: 99.379%;
}

.at-logo-word {
    left: 0;
    top: 73.577%;
    width: 98.513%;
}

.at-cover-tagline {
    width: 541.293px;
    font-size: 24px;
    line-height: 1.35;
    color: var(--at-ink);
}

.at-cover-hairline {
    margin-top: 55px;
    height: 1px;
    background-color: var(--at-rule);
}

.at-meta {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 126px;
    margin-top: 32px;
    padding-top: 28px;
}

.at-meta-lines {
    margin-top: 12px;
    font-size: 16px;
    line-height: 1.6;
    color: var(--at-body);
}

.at-hero-screens {
    position: relative;
    margin-top: 96px;
    aspect-ratio: 1200 / 831;
    border: 1px dashed var(--at-slot);
}

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

/* =====================
   Shared column rows
   ===================== */

.at-cols-3 {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 135px;
}

.at-cols-3 .at-label + p {
    margin-top: 25px;
}

/* =====================
   02 Problem — who / what / when / where
   ===================== */

.at-wwww {
    border-top: 1px solid var(--at-rule-light);
}

.at-wwww-row {
    display: grid;
    grid-template-columns: 474px 1fr;
    gap: 136px;
    padding: 28px 0;
    border-bottom: 1px solid var(--at-rule-light);
}

.at-wwww-row .at-eyebrow + p {
    margin-top: 12px;
    font-size: 20px;
    line-height: 1.65;
    color: var(--at-body);
}

/* Each cell wraps at its own measure in the design. */
.at-mw-474 { max-width: 474px; }
.at-mw-435 { max-width: 435px; }
.at-mw-420 { max-width: 420px; }

/* =====================
   02 Problem — journey map
   ===================== */

.at-journey-map {
    margin-top: 24px;
}

.at-stages {
    display: grid;
    grid-template-columns: repeat(5, minmax(0, 1fr));
    padding-bottom: 24px;
}

.at-stages h3 {
    margin-top: 10px;
    font-size: 18px;
    font-weight: 600;
    color: var(--at-ink);
}

.at-curve {
    display: block;
    width: 100%;
    height: auto;
    background-color: var(--at-panel);
}

.at-journey-band {
    display: grid;
    grid-template-columns: repeat(5, minmax(0, 1fr));
    gap: 24px;
    padding-bottom: 32px;
}

.at-journey-band--happens p {
    font-size: 16px;
    line-height: 1.6;
    color: var(--at-body);
}

.at-journey-band--thinks p {
    font-size: 18px;
    font-weight: 500;
    line-height: 1.6;
    color: var(--at-ink);
}

.at-band-label {
    margin-top: 24px;
    margin-bottom: 16px;
}

.at-journey-close {
    max-width: 820px;
    margin-top: 28px;
    font-size: 18px;
    line-height: 1.65;
    color: var(--at-ink);
}

/* =====================
   03 Principles
   ===================== */

.at-principle {
    display: flex;
    gap: 48px;
    padding: 36px 0;
    border-top: 1px solid var(--at-rule);
}

.at-principle-num {
    width: 80px;
    flex-shrink: 0;
    font-size: 16px;
    font-weight: 500;
    color: var(--at-muted);
}

.at-principle-title {
    width: 420px;
    flex-shrink: 0;
    font-size: 30px;
    font-weight: 600;
    letter-spacing: -0.3px;
    color: var(--at-ink);
}

.at-principle-text {
    width: 560px;
}

.at-principle-text p {
    font-size: 17px;
    line-height: 1.65;
    color: var(--at-body);
}

.at-principle-text p + p {
    margin-top: 16px;
    font-size: 16px;
    color: var(--at-muted);
}

/* =====================
   04 Features
   ===================== */

.at-feature-row {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 24px;
    margin-top: 40px;
}

.at-slot {
    position: relative;
    overflow: hidden;
    border: 1px dashed var(--at-slot);
}

.at-slot img {
    display: block;
    width: 100%;
    height: 100%;
    object-fit: contain;
}

.at-slot--feature { aspect-ratio: 424 / 709; }
.at-slot--journey { aspect-ratio: 312 / 610; }

.at-feature-num,
.at-journey-num {
    margin-top: 14px;
    font-size: 16px;
    font-weight: 500;
    letter-spacing: 1.12px;
    color: var(--at-muted);
}

.at-feature-title {
    margin-top: 14px;
    font-size: 30px;
    font-weight: 600;
    letter-spacing: -0.3px;
    color: var(--at-ink);
}

.at-feature-row p:last-child {
    margin-top: 14px;
}

.at-tier-row {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 24px;
    margin-top: 60px;
}

.at-tier {
    padding: 40px;
}

.at-tier--free { background-color: #fff; }
.at-tier--paid { background-color: var(--at-paid); }

.at-tier h3 {
    margin-top: 14px;
    font-size: 22px;
    font-weight: 600;
    letter-spacing: -0.11px;
    color: var(--at-ink);
}

.at-tier h3 + p {
    margin-top: 14px;
}

.at-shipped {
    margin-top: 24px;
    border-top: 1px solid var(--at-rule);
}

.at-shipped-row {
    display: grid;
    grid-template-columns: 340px 1fr;
    gap: 24px;
    padding: 18px 0;
    border-bottom: 1px solid var(--at-rule);
}

.at-shipped-row dt {
    font-size: 18px;
    font-weight: 600;
    color: var(--at-ink);
}

.at-shipped-row dd {
    margin: 0;
    font-size: 16px;
    color: var(--at-muted);
}

/* =====================
   05 User Journey
   ===================== */

.at-flow-grid {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 56px 24px;
}

.at-flow-title {
    margin-top: 18px;
    font-size: 22px;
    font-weight: 600;
    letter-spacing: -0.11px;
    color: var(--at-ink);
}

.at-flow-cell > p:last-child {
    margin-top: 18px;
}

.at-flow-cell .at-journey-num { margin-top: 18px; }

/* =====================
   06 Design System
   ===================== */

.at-section--system > .at-eyebrow { margin-top: 144px; }
.at-section--system > .at-h2 { margin-top: 40px; }
.at-section--system > .at-lede { margin-top: 40px; }
.at-section--system > .at-palette { margin-top: 114px; }
.at-section--system > .at-eyebrow--type { margin-top: 176px; }
.at-section--system > .at-type-scale { margin-top: 104px; }
.at-section--system > .at-eyebrow--rules { margin-top: 115px; }
.at-section--system > .at-cols-4 { margin-top: 40px; }
.at-section--system > .at-eyebrow--components { margin-top: 115px; }
.at-section--system > .at-specimens { margin-top: 40px; }

.at-swatches {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 24px;
    margin-top: 24px;
}

.at-swatch-chip {
    height: 200px;
    border: 1px solid var(--at-rule-light);
}

.at-swatch-chip--bg { border-color: #848484; }

.at-swatch h3 {
    margin-top: 14px;
    font-size: 18px;
    font-weight: 600;
    color: var(--at-ink);
}

.at-swatch-hex,
.at-swatch p {
    margin-top: 14px;
    font-size: 16px;
    color: var(--at-muted);
    line-height: 1.6;
}

.at-palette-note {
    max-width: 900px;
    margin-top: 40px;
    font-size: 20px;
    line-height: 1.65;
    color: var(--at-body);
}

.at-eyebrow--areas { margin-top: 96px; }

.at-areas-note {
    max-width: 900px;
    margin-top: 24px;
    font-size: 17px;
    line-height: 1.65;
    color: var(--at-body);
}

.at-areas {
    display: grid;
    grid-template-columns: repeat(6, minmax(0, 1fr));
    gap: 16px;
    margin-top: 32px;
}

.at-area-chip {
    height: 96px;
    border: 1px solid var(--at-rule-light);
}

.at-area p {
    margin-top: 12px;
    font-size: 16px;
    color: var(--at-muted);
}

.at-type-scale {
    border-top: 1px solid var(--at-rule);
    font-variant-numeric: tabular-nums;
}

.at-type-row {
    display: grid;
    grid-template-columns: 220px 210px 1fr;
    gap: 24px;
    align-items: center;
    padding: 22px 0;
    border-bottom: 1px solid var(--at-rule);
}

.at-type-row dt {
    font-size: 18px;
    font-weight: 600;
    color: var(--at-ink);
}

.at-type-row .at-type-spec {
    font-size: 16px;
    color: var(--at-muted);
}

.at-type-row dd {
    margin: 0;
    color: var(--at-ink);
}

.at-specimen-hero { font-size: 40px; font-weight: 600; letter-spacing: -0.4px; }
.at-specimen-title { font-size: 26px; font-weight: 600; letter-spacing: -0.26px; }
.at-specimen-section { font-size: 21px; font-weight: 600; }
.at-specimen-card { font-size: 18px; font-weight: 500; }
.at-specimen-body { font-size: 15px; font-weight: 400; }
.at-specimen-label { font-size: 11px; font-weight: 500; }

.at-cols-4 {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 24px;
}

.at-cols-4 h3 {
    font-size: 22px;
    font-weight: 600;
    letter-spacing: -0.11px;
    color: var(--at-ink);
}

.at-cols-4 p {
    margin-top: 12px;
}

.at-specimens {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 24px;
}

.at-specimens h3 {
    margin-top: 14px;
    font-size: 18px;
    font-weight: 600;
    color: var(--at-ink);
}

.at-specimens > div > p {
    margin-top: 14px;
}

/* The nav and band specimens are crops of a full phone screen, so the
   image is offset by a share of its own height to keep the crop
   proportional at any column width. */
.at-slot--crop img {
    position: absolute;
    left: 0;
    top: 0;
    width: 100%;
    height: auto;
    object-fit: fill;
}

.at-slot--nav { aspect-ratio: 424 / 220; }
.at-slot--nav img { transform: translateY(-76.13%); }

.at-slot--band { aspect-ratio: 424 / 231; }
.at-slot--band img { transform: translateY(-38.58%); }

.at-slot--change { aspect-ratio: 424 / 220; }
.at-slot--change img { object-fit: cover; }

.at-change-marker {
    position: absolute;
    left: 62.23%;
    top: 31.04%;
    width: 11.03%;
    aspect-ratio: 1;
    border: 3px solid #fff;
    border-radius: 50%;
    background-color: rgba(107, 107, 107, 0.44);
}

/* =====================
   07 Closing
   ===================== */

.at-cols-2 {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 24px;
}

.at-cols-2 p + p {
    margin-top: 20px;
    font-size: 17px;
    line-height: 1.65;
    color: var(--at-body);
}

.at-closing-end {
    margin-top: 96px;
    height: 1px;
    background-color: var(--at-rule);
}

/* =====================================================
   Responsive
   ===================================================== */

/* Below the 1440 design width the fixed column widths are what
   break first, so they become fluid before anything reflows. */
@media (max-width: 1439px) {

    .at-cover-head { gap: 6%; }
    .at-cover-tagline { width: auto; max-width: 541px; }

    .at-meta { gap: 10%; }
    .at-cols-3 { gap: 10%; }

    .at-wwww-row { grid-template-columns: 1fr 1fr; gap: 10%; }

    .at-principle-title { width: 32%; }
    .at-principle-text { width: auto; flex: 1; }

    .at-shipped-row { grid-template-columns: 26% 1fr; }
    .at-type-row { grid-template-columns: 17% 16% 1fr; }
}

@media (max-width: 1080px) {

    /* A 20% column is too narrow to read here, so it stacks on top. */
    .at-main { width: 100%; }

    .at-sidebar {
        position: static;
        width: 100%;
        padding: 40px 40px 0;
    }

    .at-section { padding: 40px; }
    .at-cover { padding: 64px 40px 96px; }

    .at-h2 { font-size: 38px; }
    .at-lede { font-size: 20px; }

    .at-flow-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .at-swatches { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .at-areas { grid-template-columns: repeat(3, minmax(0, 1fr)); }
    .at-cols-4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .at-specimens { grid-template-columns: 1fr; }

    .at-journey-band { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 24px; }
    .at-journey-map {
    margin-top: 24px;
}

.at-stages { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 24px; }
}

@media (max-width: 760px) {

    .at-sidebar { padding: 24px 24px 0; }

    .at-section { padding: 28px 24px; }
    .at-cover { padding: 40px 24px 64px; }

    .at-h2 { font-size: 30px; letter-spacing: -0.3px; }
    .at-lede { font-size: 18px; }

    .at-cover-head { flex-direction: column; align-items: flex-start; gap: 40px; }
    .at-meta { grid-template-columns: 1fr; gap: 32px; }
    .at-cols-3,
    .at-cols-2,
    .at-cols-4 { grid-template-columns: 1fr; gap: 32px; }

    .at-wwww-row { grid-template-columns: 1fr; gap: 24px; }
    .at-shipped-row { grid-template-columns: 1fr; gap: 8px; }
    .at-type-row { grid-template-columns: 1fr; gap: 8px; }

    .at-principle { flex-direction: column; gap: 16px; }
    .at-principle-title { width: auto; font-size: 24px; }

    .at-feature-row,
    .at-tier-row,
    .at-flow-grid { grid-template-columns: 1fr; gap: 40px; }

    .at-journey-band,
    .at-journey-map {
    margin-top: 24px;
}

.at-stages { grid-template-columns: 1fr; }

    .at-block { margin-top: 64px; }
}