:root {
    --ink: #13153e;
    --ink-soft: #3a3d66;
    --muted: #6b7094;
    --line: rgba(19, 21, 62, 0.12);
    --paper: #f4f6fb;
    --white: #ffffff;
    --blue: #1f6feb;
    --blue-deep: #0d4dab;
    --green: #198754;
    --gold: #e6a700;
    --shadow: 0 18px 50px rgba(19, 21, 62, 0.10);
    --radius: 22px;
    --font: "DM Sans", system-ui, sans-serif;
    --display: "Fraunces", Georgia, serif;
}

* { box-sizing: border-box; }

html {
    scroll-behavior: smooth;
    overflow-x: clip;
}

body {
    margin: 0;
    font-family: var(--font);
    color: var(--ink);
    background: var(--paper);
    line-height: 1.5;
    min-height: 100vh;
    min-height: 100dvh;
    overflow-x: clip;
    /* Side/bottom insets for Fold cover + in-app WebViews */
    padding-bottom: env(safe-area-inset-bottom, 0px);
    padding-left: env(safe-area-inset-left, 0px);
    padding-right: env(safe-area-inset-right, 0px);
}

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

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

.page-bg {
    position: fixed;
    inset: 0;
    z-index: -1;
    background:
        radial-gradient(900px 480px at 8% -10%, rgba(31, 111, 235, 0.18), transparent 60%),
        radial-gradient(700px 420px at 100% 0%, rgba(25, 135, 84, 0.12), transparent 55%),
        linear-gradient(180deg, #eef2fb 0%, var(--paper) 45%, #e9eef8 100%);
}

.shell {
    width: min(1120px, calc(100% - 2.5rem));
    max-width: 100%;
    margin-inline: auto;
    padding-inline: 0;
}

.site-header {
    position: sticky;
    top: 0;
    z-index: 20;
    backdrop-filter: blur(14px);
    background: rgba(244, 246, 251, 0.92);
    border-bottom: 1px solid var(--line);
    /* Status bar / app chrome buffer */
    padding-top: max(0.35rem, env(safe-area-inset-top, 0px));
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 0.75rem;
    min-height: 4.25rem;
    min-width: 0;
}

.brand {
    display: inline-flex;
    align-items: center;
    gap: 0.75rem;
    min-width: 0;
    flex: 0 1 auto;
}

.brand-mark {
    width: 2.4rem;
    height: 2.4rem;
    border-radius: 0.65rem;
    object-fit: cover;
    display: block;
    flex-shrink: 0;
}

.brand-text {
    display: flex;
    flex-direction: column;
    line-height: 1.1;
}

.brand-text strong {
    font-family: var(--display);
    font-size: 1.15rem;
}

.brand-text em {
    font-style: normal;
    color: var(--muted);
    font-size: 0.78rem;
    letter-spacing: 0.08em;
    text-transform: uppercase;
}

.header-nav {
    display: flex;
    align-items: center;
    justify-content: flex-end;
    gap: 0.75rem;
    font-size: 0.95rem;
    min-width: 0;
    flex: 0 0 auto;
}

.nav-cta-short { display: none; }

.header-nav a {
    color: var(--ink-soft);
}

.header-nav a.is-active,
.header-nav a:hover {
    color: var(--ink);
}

.nav-cta {
    padding: 0.55rem 0.95rem;
    border-radius: 999px;
    background: var(--ink);
    color: white !important;
}

.nav-user {
    color: var(--ink-soft);
    font-size: 0.92rem;
    font-weight: 600;
}

.hero {
    padding: 4.5rem 0 2.5rem;
}

.hero-inner {
    max-width: 40rem;
    animation: rise 0.7s ease both;
}

.eyebrow {
    margin: 0 0 0.75rem;
    color: var(--blue);
    font-size: 0.8rem;
    font-weight: 700;
    letter-spacing: 0.12em;
    text-transform: uppercase;
}

.hero h1,
.detail-copy h1 {
    margin: 0;
    font-family: var(--display);
    font-size: clamp(2.4rem, 5vw, 3.6rem);
    line-height: 1.05;
    letter-spacing: -0.03em;
}

.lede {
    margin: 1rem 0 0;
    color: var(--ink-soft);
    font-size: 1.1rem;
    max-width: 36rem;
}

.catalog,
.curriculum,
.detail-body {
    padding: 1rem 0 4.5rem;
}

.section-head {
    display: flex;
    align-items: end;
    justify-content: space-between;
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.section-head h2 {
    margin: 0;
    font-family: var(--display);
    font-size: 1.8rem;
}

.section-head p,
.fine-print {
    margin: 0;
    color: var(--muted);
    font-size: 0.95rem;
}

.course-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 1.25rem;
}

.course-card {
    background: rgba(255, 255, 255, 0.78);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: transform 0.25s ease, box-shadow 0.25s ease;
    animation: rise 0.6s ease both;
    max-width: 100%;
    min-width: 0;
}

.course-card:nth-child(2) { animation-delay: 0.06s; }
.course-card:nth-child(3) { animation-delay: 0.12s; }
.course-card:nth-child(4) { animation-delay: 0.18s; }

.course-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 24px 60px rgba(19, 21, 62, 0.14);
}

.course-card-media {
    position: relative;
    display: block;
    aspect-ratio: 16 / 10;
    overflow: hidden;
    background: #d9deea;
}

.course-card-media img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.45s ease;
}

.detail-cover img {
    width: 100%;
    height: auto;
    max-height: 34rem;
    object-fit: contain;
    object-position: center;
    display: block;
}

.course-card:hover .course-card-media img {
    transform: scale(1.04);
}

.badge {
    display: inline-flex;
    align-items: center;
    padding: 0.28rem 0.55rem;
    border-radius: 999px;
    font-size: 0.72rem;
    font-weight: 700;
    letter-spacing: 0.04em;
    text-transform: uppercase;
}

.badge-sale,
.badge-free,
.badge-owned,
.badge-preview {
    position: absolute;
    top: 0.85rem;
    left: 0.85rem;
}

.badge-sale { background: var(--gold); color: #1a1500; }
.badge-free { background: #e8f5e9; color: var(--green); }
.badge-owned { background: #e8f0ff; color: var(--blue-deep); }
.badge-preview { position: static; background: #e8f0ff; color: var(--blue-deep); }

.owned-label {
    color: var(--blue-deep);
    font-size: 0.88rem;
    font-weight: 650;
}

.text-link-continue {
    padding: 0.35rem 0.75rem;
    border-radius: 999px;
    background: linear-gradient(135deg, var(--blue), var(--blue-deep));
    color: white !important;
}

.owned-banner {
    margin: 1.25rem 0 0;
    display: inline-flex;
    align-items: center;
    padding: 0.45rem 0.85rem;
    border-radius: 999px;
    background: #e8f0ff;
    color: var(--blue-deep);
    font-size: 0.88rem;
    font-weight: 650;
}

.course-card-body {
    padding: 1.15rem 1.2rem 1.25rem;
}

.course-card-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem 0.75rem;
    color: var(--muted);
    font-size: 0.82rem;
    margin-bottom: 0.55rem;
    min-width: 0;
}

.course-card-meta span {
    min-width: 0;
    overflow-wrap: anywhere;
}

.course-card-body h3 {
    margin: 0;
    font-size: 1.15rem;
    line-height: 1.25;
}

.course-card-body h3 a:hover { color: var(--blue-deep); }

.course-card-body > p {
    margin: 0.55rem 0 0;
    color: var(--ink-soft);
    font-size: 0.92rem;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    min-height: 2.7em;
}

.course-card-foot {
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 0.65rem;
    margin-top: 1rem;
    padding-top: 0.9rem;
    border-top: 1px solid var(--line);
    min-width: 0;
}

.course-card-foot .owned-label,
.course-card-foot .price {
    min-width: 0;
    flex: 1 1 auto;
}

.course-card-foot .text-link {
    flex: 0 0 auto;
}

.price {
    display: flex;
    align-items: baseline;
    gap: 0.45rem;
}

.price s {
    color: var(--muted);
    font-size: 0.85rem;
}

.price strong { font-size: 1rem; }

.price.is-sale strong { color: #9a6b00; }

.text-link {
    color: var(--blue);
    font-weight: 600;
    font-size: 0.92rem;
}

.detail-hero {
    padding: 2.5rem 0 1rem;
}

.back-link {
    display: inline-block;
    margin-bottom: 1.5rem;
    color: var(--muted);
    font-size: 0.92rem;
}

.detail-grid {
    display: grid;
    grid-template-columns: 1.15fr 0.85fr;
    gap: 2rem;
    align-items: center;
}

.detail-cover {
    border-radius: calc(var(--radius) + 4px);
    overflow: hidden;
    box-shadow: var(--shadow);
    background:
        radial-gradient(120% 80% at 50% 0%, rgba(255, 255, 255, 0.55), transparent 55%),
        linear-gradient(160deg, #e8edf7 0%, #d9deea 100%);
    animation: rise 0.7s ease both;
    display: flex;
    align-items: center;
    justify-content: center;
}

.detail-copy { animation: rise 0.55s ease both; }

.detail-stats {
    display: flex;
    flex-wrap: wrap;
    gap: 0.65rem;
    margin-top: 1.25rem;
}

.detail-stats span {
    padding: 0.4rem 0.75rem;
    border-radius: 999px;
    background: rgba(255, 255, 255, 0.7);
    border: 1px solid var(--line);
    font-size: 0.85rem;
    color: var(--ink-soft);
}

.detail-price {
    margin-top: 1.25rem;
    display: flex;
    align-items: baseline;
    gap: 0.55rem;
}

.detail-price strong {
    font-family: var(--display);
    font-size: 2rem;
}

.detail-price.is-sale strong { color: #9a6b00; }

.detail-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
    margin-top: 1.35rem;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 2.9rem;
    padding: 0.7rem 1.2rem;
    border-radius: 999px;
    font-weight: 650;
    border: 1px solid transparent;
    transition: transform 0.2s ease, background 0.2s ease;
}

.btn:hover { transform: translateY(-1px); }

.btn-primary {
    background: linear-gradient(135deg, var(--blue), var(--blue-deep));
    color: white;
    box-shadow: 0 10px 24px rgba(13, 77, 171, 0.28);
}

.btn-ghost {
    background: rgba(255, 255, 255, 0.7);
    border-color: var(--line);
    color: var(--ink);
}

.fine-print { margin-top: 0.85rem; }

.detail-body-grid {
    display: grid;
    gap: 1rem;
}

.content-block {
    background: rgba(255, 255, 255, 0.72);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    padding: 1.35rem 1.4rem;
}

.content-block h2 {
    margin: 0 0 0.7rem;
    font-family: var(--display);
    font-size: 1.35rem;
}

.rich-text {
    color: var(--ink-soft);
    font-size: 1rem;
    line-height: 1.55;
}

.rich-text > *:first-child {
    margin-top: 0;
}

.rich-text > *:last-child {
    margin-bottom: 0;
}

.rich-text p {
    margin: 0 0 0.65rem;
}

.rich-text ul,
.rich-text ol {
    margin: 0.35rem 0 0.65rem;
    padding-left: 1.25rem;
}

.rich-text li {
    margin: 0.2rem 0;
}

.rich-text li + li {
    margin-top: 0.35rem;
}

.chapter {
    background: rgba(255, 255, 255, 0.75);
    border: 1px solid var(--line);
    border-radius: 18px;
    margin-bottom: 0.75rem;
    overflow: hidden;
}

.chapter summary {
    list-style: none;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    gap: 1rem;
    align-items: center;
    padding: 1rem 1.15rem;
    font-weight: 650;
}

.chapter summary::-webkit-details-marker { display: none; }

.chapter summary em {
    font-style: normal;
    color: var(--muted);
    font-weight: 500;
    font-size: 0.88rem;
}

.chapter ul {
    margin: 0;
    padding: 0 1.15rem 1rem;
    list-style: none;
}

.chapter li {
    display: flex;
    justify-content: space-between;
    gap: 1rem;
    align-items: center;
    padding: 0.75rem 0;
    border-top: 1px solid var(--line);
    color: var(--ink-soft);
}

.lesson-meta {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--muted);
    font-size: 0.82rem;
    white-space: nowrap;
}

.curriculum-cta {
    margin-top: 1.5rem;
}

.empty-state {
    padding: 2.5rem 1.5rem;
    text-align: center;
    border: 1px dashed var(--line);
    border-radius: var(--radius);
    background: rgba(255, 255, 255, 0.55);
}

.empty-state h3 { margin: 0 0 0.4rem; font-family: var(--display); }
.empty-state p { margin: 0; color: var(--muted); }

.pagination-wrap {
    margin-top: 2rem;
    display: flex;
    justify-content: center;
}

.pager {
    display: flex;
    gap: 0.5rem;
    align-items: center;
}

.pager a,
.pager span {
    min-width: 2.4rem;
    height: 2.4rem;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border-radius: 999px;
    border: 1px solid var(--line);
    background: white;
    color: var(--ink-soft);
    font-size: 0.9rem;
}

.pager a:hover { color: var(--ink); border-color: var(--blue); }
.pager .is-current {
    background: var(--ink);
    color: white;
    border-color: var(--ink);
}

.site-footer {
    border-top: 1px solid var(--line);
    padding: 1.5rem 0 calc(2rem + env(safe-area-inset-bottom, 0px));
}

.footer-inner {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 1rem;
    flex-wrap: wrap;
    color: var(--muted);
    font-size: 0.9rem;
    min-width: 0;
}

.footer-inner p {
    margin: 0;
    flex: 1 1 12rem;
    min-width: 0;
    overflow-wrap: anywhere;
}

.footer-inner a { color: var(--blue); font-weight: 600; }

@keyframes rise {
    from { opacity: 0; transform: translateY(12px); }
    to { opacity: 1; transform: translateY(0); }
}

@media (max-width: 900px) {
    .course-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .detail-grid { grid-template-columns: 1fr; }
    .detail-cover {
        order: -1;
        max-width: 22rem;
        margin-inline: auto;
    }
}

.hero-compact {
    padding-top: 2.5rem;
    padding-bottom: 1.25rem;
}

.hero-compact .hero-inner {
    max-width: 40rem;
}

.hero-compact h1 {
    font-size: clamp(1.9rem, 4vw, 2.6rem);
}

.hero-actions {
    margin-top: 1.25rem;
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
}

.my-learning .section-head {
    margin-top: 0.5rem;
}

.learning-list {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    margin-bottom: 2.5rem;
    width: 100%;
}

.learning-card {
    display: flex;
    flex-direction: row;
    align-items: stretch;
    width: 100%;
    max-width: 100%;
    background: rgba(255, 255, 255, 0.9);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: 0 10px 30px rgba(19, 21, 62, 0.06);
    animation: rise 0.55s ease both;
}

.learning-card-media {
    flex: 0 0 200px;
    width: 200px;
    max-width: 200px;
    min-height: 150px;
    align-self: stretch;
    background: #d9deea;
    overflow: hidden;
}

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

.learning-card-body {
    flex: 1 1 auto;
    min-width: 0;
    padding: 1.15rem 1.3rem 1.25rem;
    display: flex;
    flex-direction: column;
}

.learning-card-top {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 0.75rem;
    flex-wrap: wrap;
    margin-bottom: 0.5rem;
}

.badge-status {
    position: static !important;
    text-transform: none;
    letter-spacing: 0.02em;
    font-size: 0.75rem;
}

.badge-status-in_progress { background: #e8f0ff; color: var(--blue-deep); }
.badge-status-not_started { background: #f1f3f8; color: var(--muted); }
.badge-status-completed { background: #e8f5e9; color: var(--green); }

.learning-meta {
    color: var(--muted);
    font-size: 0.82rem;
    white-space: nowrap;
}

.learning-card-body h3 {
    margin: 0;
    font-family: var(--display);
    font-size: 1.35rem;
    line-height: 1.2;
}

.learning-card-body h3 a:hover { color: var(--blue-deep); }

.learning-next {
    margin: 0.45rem 0 0;
    color: var(--ink-soft);
    font-size: 0.95rem;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.progress-track {
    margin-top: 1rem;
    height: 0.5rem;
    border-radius: 999px;
    background: rgba(19, 21, 62, 0.1);
    overflow: hidden;
}

.progress-fill {
    display: block;
    height: 100%;
    min-width: 0;
    border-radius: inherit;
    background: linear-gradient(90deg, var(--blue), var(--blue-deep));
}

.learning-card-foot {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 0.75rem;
    margin-top: 0.85rem;
}

.progress-label {
    font-size: 0.9rem;
    color: var(--ink-soft);
    font-weight: 650;
}

@media (max-width: 640px) {
    .shell {
        width: min(1120px, calc(100% - 2rem));
    }

    .course-grid {
        grid-template-columns: minmax(0, 1fr);
        gap: 1rem;
    }

    .header-nav a:not(.nav-cta) { display: none; }
    .nav-user { display: none; }

    .header-inner {
        min-height: 3.75rem;
        gap: 0.5rem;
    }

    .brand-text em { display: none; }

    .nav-cta {
        padding: 0.45rem 0.8rem;
        font-size: 0.88rem;
        white-space: nowrap;
    }

    .nav-cta-full { display: none; }
    .nav-cta-short { display: inline; }

    .hero {
        padding: 2rem 0 1.5rem;
    }

    .hero h1,
    .detail-copy h1 {
        font-size: clamp(1.75rem, 8vw, 2.4rem);
        overflow-wrap: anywhere;
    }

    .lede {
        font-size: 1rem;
    }

    .catalog,
    .curriculum,
    .detail-body {
        padding: 0.5rem 0 3rem;
    }

    .course-card-body {
        padding: 1rem;
    }

    .course-card-foot {
        gap: 0.5rem;
    }

    .text-link-continue {
        padding: 0.4rem 0.7rem;
        font-size: 0.85rem;
    }

    .footer-inner {
        flex-direction: column;
        gap: 0.65rem;
    }

    .learning-card {
        flex-direction: column;
    }

    .learning-card-media {
        flex: none;
        width: 100%;
        max-width: none;
        height: auto;
        aspect-ratio: 16 / 9;
        max-height: 12rem;
        min-height: 0;
    }

    /* Keep My learning CTA visible on small screens */
    .header-nav a.nav-cta { display: inline-flex; align-items: center; }
}

/* Ultra-narrow covers (e.g. Fold front screen / in-app WebView) */
@media (max-width: 380px) {
    .shell {
        width: min(1120px, calc(100% - 1.5rem));
    }

    .brand-mark {
        width: 2rem;
        height: 2rem;
    }

    .brand-text strong {
        font-size: 1rem;
    }

    .brand {
        gap: 0.5rem;
    }

    .hero {
        padding-top: 1.5rem;
    }

    .section-head {
        flex-direction: column;
        align-items: flex-start;
        gap: 0.25rem;
    }

    .course-card {
        border-radius: 16px;
    }
}