:root {
    color-scheme: light;
    font-family: "Jost", Arial, sans-serif;
    color: #20202c;
    background: var(--background);
    font-synthesis: none;
    --background: #f7f8fc;
    --foreground: #20202c;
    --card: #fff;
    --border: #e9e9ef;
    --primary: #f56a00;
    --secondary: #fff2e9;
    --catalog-action-hover: #f2f3f7;
    --muted: #686979;
    --success: #16834a;
    --warning: #916100;
    --danger: #ad2525;
}

[data-theme="dark"] {
    color-scheme: dark;
    --background: #15151d;
    --foreground: #ededf4;
    --card: #20202b;
    --border: #373746;
    --primary: #ff9c57;
    --secondary: #39271d;
    --catalog-action-hover: #30303e;
    --muted: #b4b4c2;
    --success: #6ed49b;
    --warning: #f1c45d;
    --danger: #ff8f8f;
}

* {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    margin: 0;
    min-height: 100vh;
    background: var(--background);
    color: var(--foreground);
}

a {
    color: var(--primary);
    text-decoration: none;
}

a:hover {
    color: var(--primary);
    text-decoration: underline;
    text-underline-offset: 3px;
}

button,
input,
textarea {
    font: inherit;
}

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

.visually-hidden {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

.tutorial-main,
.tutorial-footer-inner {
    width: min(1180px, calc(100% - 40px));
    margin: 0 auto;
}

.site-header {
    position: relative;
    z-index: 30;
    border-bottom: 1px solid var(--border);
}

.site-header > .container {
    width: min(1320px, calc(100% - 40px));
    max-width: none;
    margin: 0 auto;
    padding: 0;
}

.site-header .header-wrapper {
    min-height: 82px;
    display: flex;
    align-items: center;
    gap: 20px;
}

.site-header .logo img {
    width: 245px;
}

.site-header .header-menu-wrapper {
    min-width: 0;
    flex: 1;
}

.site-header .header-menu {
    flex-wrap: wrap;
    gap: 0;
    margin: 0;
    padding: 0;
    list-style: none;
}

.site-header .header-menu li {
    padding-right: 7px;
    padding-left: 7px;
}

.site-header .menu-link {
    font-size: 15px;
}

.site-header .header-btn-wrapper {
    flex: 0 0 auto;
}

.site-header .menu-link[aria-current="page"] {
    color: var(--primary);
}

.tutorial-tools {
    display: flex;
    width: min(1180px, calc(100% - 40px));
    align-items: center;
    gap: 16px;
    margin: 14px auto 0;
}

.tutorial-search {
    display: flex;
    flex: 1 1 260px;
    max-width: 460px;
}

.tutorial-search input,
.search-page-form input {
    min-width: 0;
    flex: 1;
    padding: 9px 12px;
    border: 1px solid var(--border);
    border-radius: 8px 0 0 8px;
    background: var(--background);
    color: var(--foreground);
}

.tutorial-search button {
    padding: 8px 12px;
    border: 1px solid var(--border);
    border-left: 0;
    border-radius: 0 8px 8px 0;
    background: var(--card);
    color: var(--foreground);
    cursor: pointer;
}

.tutorial-header-progress {
    display: grid;
    min-width: 110px;
    gap: 4px;
    color: var(--muted);
    font-size: 12px;
}

.tutorial-header-progress progress,
.sidebar-progress progress,
.progress-dashboard progress {
    width: 100%;
    height: 8px;
    accent-color: var(--primary);
}

.tutorial-theme-toggle,
.tutorial-menu-toggle {
    display: inline-grid;
    flex: 0 0 auto;
    place-items: center;
    min-width: 42px;
    min-height: 42px;
    border: 1px solid var(--border);
    border-radius: 9px;
    background: var(--card);
    color: var(--foreground);
    cursor: pointer;
}

.tutorial-menu-toggle {
    display: none;
    align-items: center;
    justify-content: center;
    min-height: 48px;
    padding: 10px 18px;
    border: 1px solid color-mix(in srgb, var(--primary) 38%, var(--border));
    border-radius: 10px;
    background: var(--secondary);
    color: var(--primary);
    font: inherit;
    font-size: 16px;
    font-weight: 700;
    cursor: pointer;
}

.tutorial-header-progress {
    display: grid;
    min-width: 140px;
    gap: 4px;
    color: var(--muted);
    font-size: 12px;
}

.tutorial-header-progress progress {
    width: 100%;
    height: 8px;
    accent-color: var(--primary);
}

.tutorial-tools > .tutorial-theme-toggle {
    margin-left: auto;
}

.tutorial-main {
    width: min(1180px, calc(100% - 40px));
    margin: 0 auto;
}

.tutorial-main.tutorial-lesson-main {
    width: min(1360px, calc(100% - 40px));
}

.tutorial-main {
    min-height: calc(100vh - 150px);
    padding: 42px 0 64px;
}

.tutorial-main h1,
.tutorial-main h2,
.tutorial-main h3 {
    color: var(--foreground);
    line-height: 1.2;
}

.tutorial-main h1 {
    margin: 0 0 14px;
    font-size: clamp(30px, 5vw, 46px);
}

.tutorial-main h2 {
    margin: 0 0 14px;
    font-size: 23px;
}

.tutorial-main h3 {
    margin: 0 0 10px;
    font-size: 19px;
}

.tutorial-eyebrow {
    margin: 0 0 8px;
    color: var(--primary);
    font-size: 13px;
    font-weight: 700;
    letter-spacing: 0.08em;
    text-transform: uppercase;
}

.tutorial-intro {
    max-width: 760px;
    color: var(--muted);
    font-size: 17px;
    line-height: 1.7;
}

.tutorial-card-grid,
.section-card-grid,
.course-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 20px;
    margin-top: 32px;
}

.course-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 14px;
    margin-top: 0;
}

.tutorial-card,
.tutorial-panel,
.lesson-content,
.code-example,
.practice-card,
.playground-card,
.section-card {
    border: 1px solid var(--border);
    border-radius: 16px;
    background: var(--card);
    box-shadow: 0 8px 28px rgb(29 29 50 / 4%);
}

.tutorial-card {
    padding: 24px;
}

.tutorial-card h2 {
    margin: 0 0 10px;
    font-size: 22px;
}

.tutorial-card p,
.tutorial-panel p {
    color: var(--muted);
    line-height: 1.65;
}

.tutorial-button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    min-height: 42px;
    padding: 10px 16px;
    border: 0;
    border-radius: 9px;
    background: var(--primary);
    color: #fff;
    font-weight: 600;
    cursor: pointer;
}

.tutorial-button:hover {
    color: #fff;
    filter: brightness(0.93);
    text-decoration: none;
}

.tutorial-button:disabled {
    cursor: not-allowed;
    opacity: 0.6;
}

.course-hero {
    position: relative;
    display: flex;
    min-height: 250px;
    align-items: center;
    justify-content: space-between;
    gap: 24px;
    overflow: hidden;
    padding: clamp(24px, 5vw, 50px);
    border: 1px solid var(--border);
    border-radius: 20px;
    background: linear-gradient(120deg, var(--card), var(--secondary));
}

.catalog-heading {
    max-width: 760px;
    margin: 22px auto 34px;
    text-align: center;
}

.catalog-heading h1 {
    margin-bottom: 10px;
}

.catalog-heading > p:last-child {
    margin: 0;
    color: var(--muted);
    font-size: 17px;
    line-height: 1.65;
}

.catalog-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 22px;
    align-items: stretch;
}

.catalog-card {
    display: flex;
    min-width: 0;
    flex-direction: column;
    overflow: hidden;
    border: 1px solid var(--border);
    border-radius: 16px;
    background: var(--card);
    box-shadow: 0 9px 26px rgb(29 29 50 / 5%);
    transition: transform 160ms ease, box-shadow 160ms ease;
}

.catalog-card:hover {
    transform: translateY(-2px);
    border-color: color-mix(in srgb, var(--border) 55%, var(--muted));
    box-shadow: 0 12px 30px rgb(29 29 50 / 8%);
}

.catalog-card-link {
    display: flex;
    flex: 1;
    flex-direction: column;
    color: var(--foreground);
    text-decoration: none;
}

.catalog-card-link:hover {
    color: var(--foreground);
    text-decoration: none;
}

.catalog-card-art {
    --art-bg: linear-gradient(145deg, #fff1e5, #fffaf5);
    --art-fg: #d95700;
    --art-accent: #f56a00;
    position: relative;
    display: grid;
    min-height: 164px;
    place-items: center;
    overflow: hidden;
    background: var(--art-bg);
    color: var(--art-fg);
}

.catalog-card-art::before,
.catalog-card-art::after {
    position: absolute;
    width: 180px;
    height: 180px;
    border: 1px solid currentColor;
    border-radius: 50%;
    content: "";
    opacity: .14;
}

.catalog-card-art::before {
    top: -112px;
    right: -24px;
}

.catalog-card-art::after {
    bottom: -138px;
    left: -34px;
    width: 220px;
    height: 220px;
}

.catalog-card-art--php {
    --art-bg: linear-gradient(135deg, #dce8ff, #f1f5ff 58%, #dce3ff);
    --art-fg: #304b93;
    --art-accent: #5376ca;
}

.catalog-card-art--python {
    --art-bg: linear-gradient(135deg, #fff1c9, #fff9e9 58%, #e4f4d8);
    --art-fg: #506b2f;
    --art-accent: #3573a5;
}

.catalog-card-art--genai {
    --art-bg: linear-gradient(135deg, #f0e3ff, #fbf5ff 58%, #e7e2ff);
    --art-fg: #633c9c;
    --art-accent: #8655c9;
}

.catalog-card-art--data-engineering {
    --art-bg: linear-gradient(135deg, #d7f2ed, #f0fbf8 58%, #dceeff);
    --art-fg: #176b65;
    --art-accent: #258f84;
}

.catalog-card-art--analytics {
    --art-bg: linear-gradient(135deg, #ffe0d6, #fff4ef 58%, #ffe9c7);
    --art-fg: #9b412a;
    --art-accent: #e66843;
}

.catalog-card-art--data-science {
    --art-bg: linear-gradient(135deg, #d9f1ff, #f0faff 58%, #dff4ec);
    --art-fg: #24617d;
    --art-accent: #3689a8;
}

[data-theme="dark"] .catalog-card-art {
    --art-bg: linear-gradient(145deg, #29242b, #20202b);
    --art-fg: #ffb17a;
    --art-accent: #ff9c57;
}

[data-theme="dark"] .catalog-card-art--php {
    --art-bg: linear-gradient(135deg, #252d45, #292a3a);
    --art-fg: #aabfff;
    --art-accent: #91a8ff;
}

[data-theme="dark"] .catalog-card-art--python {
    --art-bg: linear-gradient(135deg, #34331f, #27352e);
    --art-fg: #d4df8a;
    --art-accent: #8ec9e8;
}

[data-theme="dark"] .catalog-card-art--genai {
    --art-bg: linear-gradient(135deg, #352a48, #29243d);
    --art-fg: #d0b0ff;
    --art-accent: #bd96ff;
}

[data-theme="dark"] .catalog-card-art--data-engineering {
    --art-bg: linear-gradient(135deg, #203b3b, #202d3c);
    --art-fg: #8bd8c8;
    --art-accent: #73d0bd;
}

[data-theme="dark"] .catalog-card-art--analytics {
    --art-bg: linear-gradient(135deg, #452b29, #3d3026);
    --art-fg: #ffb09a;
    --art-accent: #ff9c7b;
}

[data-theme="dark"] .catalog-card-art--data-science {
    --art-bg: linear-gradient(135deg, #203a48, #203a3b);
    --art-fg: #9eddf1;
    --art-accent: #85d3cf;
}

.catalog-card-art-label,
.catalog-card-art-mark,
.catalog-card-art-icon {
    position: absolute;
    z-index: 1;
}

.catalog-card-art-label {
    top: 18px;
    left: 20px;
    color: var(--art-fg);
    font-size: 12px;
    font-weight: 700;
    letter-spacing: .1em;
    text-transform: uppercase;
}

.catalog-card-art-icon {
    display: grid;
    width: 88px;
    height: 88px;
    place-items: center;
    border: 1px solid color-mix(in srgb, var(--art-fg) 22%, transparent);
    border-radius: 26px;
    background: color-mix(in srgb, var(--card) 68%, transparent);
    box-shadow: 0 12px 30px color-mix(in srgb, var(--art-fg) 13%, transparent);
    color: var(--art-fg);
    font: 700 42px/1 "Cascadia Code", Consolas, monospace;
    transform: rotate(-5deg);
}

.catalog-card-art--php .catalog-card-art-icon {
    font-size: 34px;
}

.catalog-card-art--genai .catalog-card-art-icon,
.catalog-card-art--analytics .catalog-card-art-icon,
.catalog-card-art--data-science .catalog-card-art-icon {
    font-family: Arial, sans-serif;
}

.catalog-card-art-mark {
    right: 18px;
    bottom: 15px;
    padding: 5px 9px;
    border: 1px solid color-mix(in srgb, var(--art-fg) 17%, transparent);
    border-radius: 999px;
    background: color-mix(in srgb, var(--card) 66%, transparent);
    color: var(--art-fg);
    font-size: 11px;
    font-weight: 600;
}

.catalog-card-content {
    display: grid;
    flex: 1;
    align-content: start;
    gap: 11px;
    padding: 20px 20px 14px;
}

.catalog-card-kicker {
    color: var(--primary);
    font-size: 10px;
    font-weight: 700;
    letter-spacing: 0.07em;
}

.catalog-card-title {
    font-size: 21px;
    font-weight: 700;
}

.catalog-card-summary {
    min-height: 48px;
    color: var(--muted);
    font-size: 14px;
    line-height: 1.6;
}

.catalog-card-meta {
    display: flex;
    align-items: center;
    gap: 8px;
    color: var(--muted);
    font-size: 12px;
}

.catalog-card-button {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin: 0 20px 20px;
    padding: 11px 14px;
    border: 1px solid var(--primary);
    border-radius: 8px;
    color: var(--primary);
    font-size: 14px;
    font-weight: 600;
}

.catalog-card-button:hover {
    background: var(--catalog-action-hover);
    color: var(--primary);
    text-decoration: none;
}

.catalog-card-button:focus-visible {
    background: var(--catalog-action-hover);
    color: var(--primary);
    text-decoration: none;
}

.course-hero > div:first-child {
    max-width: 670px;
}

.course-hero-art {
    display: grid;
    width: 220px;
    height: 180px;
    flex: 0 0 auto;
    place-items: center;
    border: 1px solid var(--border);
    border-radius: 20px;
    background: var(--card);
    color: var(--primary);
    font: 700 28px/1.3 ui-monospace, Consolas, monospace;
    transform: rotate(2deg);
}

.course-hero-art span {
    margin-top: 30px;
}

.course-hero-art i {
    margin-top: -70px;
    font-size: 54px;
    font-style: normal;
}

.course-dashboard {
    display: grid;
    gap: 18px;
    margin-top: 24px;
}

.stat-card {
    display: grid;
    gap: 8px;
    padding: 18px;
}

.stat-card strong {
    font-size: 22px;
}

.stat-card span {
    color: var(--muted);
    font-size: 14px;
}

.progress-dashboard,
.continue-card {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 28px;
    padding: 20px 24px;
}

.progress-dashboard h2 {
    margin: 0;
    font-size: 22px;
}

.progress-dashboard p,
.continue-card h2 {
    margin-bottom: 0;
}

.progress-dashboard progress {
    max-width: 320px;
    height: 12px;
}

.continue-card[hidden] {
    display: none;
}

.section-heading {
    display: flex;
    align-items: end;
    justify-content: space-between;
    gap: 20px;
    margin: 42px 0 18px;
}

.section-heading h2 {
    margin-bottom: 0;
}

.section-heading > p {
    color: var(--muted);
}

.section-card-grid {
    grid-template-columns: repeat(auto-fit, minmax(290px, 1fr));
    gap: 14px;
    margin-top: 0;
}

.section-card {
    display: grid;
    grid-template-columns: 48px 1fr;
    align-items: start;
    gap: 14px;
    padding: 20px;
}

.section-card p {
    margin: 0 0 12px;
    color: var(--muted);
    line-height: 1.6;
}

.section-number {
    display: grid;
    width: 42px;
    height: 42px;
    place-items: center;
    border-radius: 12px;
    background: var(--secondary);
    color: var(--primary);
    font-weight: 700;
}

.section-count {
    display: block;
    margin-bottom: 12px;
    color: var(--muted);
    font-size: 14px;
}

.section-link {
    font-weight: 600;
}

.section-coming-soon {
    display: block;
    padding: 8px 0;
    color: var(--muted);
    font-size: 13px;
}

.course-overview-heading {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 24px;
    margin-bottom: 28px;
}

.course-overview-heading .tutorial-intro {
    margin-bottom: 0;
}

.course-reader {
    display: grid;
    grid-template-columns: minmax(225px, 265px) minmax(0, 1fr) minmax(150px, 190px);
    align-items: start;
    gap: 26px;
    margin-top: 24px;
}

.course-overview-reader {
    grid-template-columns: minmax(200px, 240px) minmax(0, 1fr);
}

.course-overview-reader > .on-page-panel {
    display: none;
}

.course-sidebar {
    position: sticky;
    top: 88px;
    max-height: calc(100vh - 108px);
    overflow-y: auto;
    padding: 16px 13px;
    border: 1px solid var(--border);
    border-radius: 14px;
    background: var(--card);
}

.sidebar-heading {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 12px;
}

.sidebar-heading h2 {
    margin: 0;
    font-size: 18px;
}

.sidebar-heading button {
    display: none;
    min-width: 34px;
    min-height: 34px;
    border: 1px solid var(--border);
    border-radius: 8px;
    background: var(--card);
    color: var(--foreground);
    font-size: 22px;
}

.sidebar-progress {
    display: grid;
    gap: 6px;
    margin: 14px 0;
    font-size: 13px;
}

.section-navigation {
    display: grid;
    gap: 3px;
}

.lesson-section {
    border-top: 1px solid var(--border);
}

.lesson-section summary {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 10px;
    padding: 12px 3px;
    color: var(--foreground);
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
}

.lesson-section summary::marker {
    color: var(--primary);
}

.section-nav-title {
    flex: 1;
}

.section-nav-count {
    color: var(--muted);
    font-size: 12px;
}

.lesson-list {
    display: grid;
    gap: 3px;
    margin: 0;
    padding: 0 0 10px;
    list-style: none;
}

.lesson-list a {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 8px 9px;
    border-radius: 8px;
    color: var(--muted);
    font-size: 13px;
    line-height: 1.45;
}

.lesson-upcoming {
    display: flex;
    align-items: flex-start;
    gap: 8px;
    padding: 8px 10px;
    color: var(--muted);
    font-size: 13px;
    line-height: 1.45;
}

.coming-soon-label {
    flex-shrink: 0;
    margin-left: auto;
    padding: 2px 5px;
    border-radius: 5px;
    background: var(--secondary);
    font-size: 10px;
    font-weight: 700;
    text-transform: uppercase;
}

.lesson-list a:hover,
.lesson-list a.is-active {
    background: var(--secondary);
    color: var(--primary);
    text-decoration: none;
}

.lesson-list a.is-completed {
    color: var(--success);
}

.lesson-complete-indicator {
    display: inline-grid;
    width: 16px;
    height: 16px;
    flex: 0 0 16px;
    place-items: center;
    border: 1px solid var(--border);
    border-radius: 50%;
    color: var(--success);
    font-size: 11px;
    font-weight: 700;
}

.lesson-list a.is-completed .lesson-complete-indicator {
    border-color: var(--success);
}

.lesson-content {
    min-width: 0;
    padding: clamp(22px, 4vw, 38px);
}

.tutorial-breadcrumb {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 9px;
    margin: 0 0 20px;
    color: var(--muted);
    font-size: 14px;
}

.tutorial-breadcrumb > span:last-child {
    color: var(--foreground);
}

.lesson-title-row h1 {
    font-size: clamp(30px, 4vw, 40px);
}

.lesson-navigation {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    margin-top: 24px;
}

.lesson-navigation-top {
    padding-bottom: 20px;
    border-bottom: 1px solid var(--border);
}

.lesson-navigation-bottom {
    padding-top: 22px;
    border-top: 1px solid var(--border);
}

.lesson-navigation a:not(.tutorial-button) {
    color: var(--primary);
    font-weight: 600;
}

.lesson-section-content {
    margin-top: 32px;
    scroll-margin-top: 95px;
}

.lesson-section-content h2 {
    margin-bottom: 13px;
}

.process-diagram {
    margin: 28px 0;
    padding: 22px;
    border: 1px solid var(--border);
    border-radius: 14px;
    background: var(--card);
}

.process-diagram figcaption h2 {
    margin-bottom: 20px;
}

.process-steps {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(165px, 1fr));
    gap: 28px;
    margin: 0;
    padding: 0;
    list-style: none;
}

.process-steps li {
    position: relative;
    display: grid;
    align-content: start;
    gap: 8px;
    min-width: 0;
    min-height: 150px;
    padding: 18px;
    border: 1px solid var(--border);
    border-radius: 12px;
    background: var(--background);
}

.process-steps li:not(:last-child)::after {
    position: absolute;
    top: 50%;
    right: -25px;
    color: var(--primary);
    content: "→";
    font-size: 22px;
    font-weight: 700;
    transform: translateY(-50%);
}

.process-step-number {
    color: var(--primary);
    font-size: 12px;
    font-weight: 700;
    letter-spacing: .06em;
    text-transform: uppercase;
}

.process-steps strong {
    color: var(--foreground);
    font-size: 16px;
}

.process-steps p {
    margin: 0;
    color: var(--muted);
    font-size: 14px;
    line-height: 1.55;
}

.lesson-prose {
    color: var(--foreground);
    font-size: 16px;
    line-height: 1.85;
    overflow-wrap: anywhere;
}

.lesson-prose h3 {
    margin: 28px 0 10px;
    color: var(--foreground);
    font-size: 20px;
    line-height: 1.35;
}

.lesson-prose h4 {
    margin: 22px 0 8px;
    color: var(--foreground);
    font-size: 17px;
    line-height: 1.4;
}

.lesson-prose p {
    margin: 0 0 16px;
}

.lesson-prose ul,
.lesson-prose ol {
    display: grid;
    gap: 8px;
    margin: 10px 0 20px;
    padding-left: 24px;
}

.lesson-prose li {
    padding-left: 3px;
}

.lesson-prose p code,
.lesson-prose li code {
    padding: 2px 5px;
    border: 1px solid var(--border);
    border-radius: 5px;
    background: var(--background);
    font-size: .9em;
}

.lesson-prose pre {
    max-width: 100%;
    overflow-x: auto;
    margin: 12px 0 20px;
    padding: 16px;
    border: 1px solid var(--border);
    border-radius: 10px;
    background: var(--background);
    line-height: 1.6;
    white-space: pre;
}

.lesson-prose pre code {
    font-family: "Cascadia Code", Consolas, monospace;
    font-size: 14px;
}

.overview-content {
    min-width: 0;
    padding: 24px;
    border: 1px solid var(--border);
    border-radius: 14px;
    background: var(--card);
}

.overview-content .lesson-prose {
    margin-bottom: 24px;
}

.on-page-panel {
    position: sticky;
    top: 92px;
    display: grid;
    gap: 10px;
    padding: 13px 2px;
}

.on-page-panel .tutorial-eyebrow {
    margin-bottom: 2px;
}

.on-page-panel a {
    padding-left: 12px;
    border-left: 2px solid var(--border);
    color: var(--muted);
    font-size: 13px;
}

.on-page-panel a:hover {
    border-color: var(--primary);
    color: var(--primary);
}

.key-points ul {
    display: grid;
    gap: 10px;
    padding-left: 22px;
    color: var(--foreground);
    line-height: 1.7;
}

.completion-card {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 20px;
    padding: 18px;
    border: 1px solid var(--border);
    border-radius: 12px;
    background: var(--secondary);
}

.completion-card h2 {
    margin: 0;
}

.completion-card .tutorial-eyebrow {
    margin-bottom: 5px;
}

.tutorial-button.is-complete {
    background: var(--success);
}

.code-example {
    min-width: 0;
    overflow: hidden;
    margin-top: 16px;
    border-radius: 12px;
}

.code-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    padding: 10px 13px;
    background: #242432;
    color: #eee;
    font-size: 13px;
}

.code-header > div {
    display: flex;
    align-items: center;
    gap: 12px;
}

.code-language {
    color: #b5b5c1;
    font-size: 11px;
}

.copy-code-button {
    padding: 6px 9px;
    border: 1px solid #545462;
    border-radius: 6px;
    background: #31313f;
    color: #fff;
    font-size: 12px;
    cursor: pointer;
}

.php-code {
    overflow-x: auto;
    margin: 0;
    padding: 17px 0;
    background: #171720;
    color: #f3f3f7;
    font: 14px/1.7 Consolas, "Courier New", monospace;
    tab-size: 4;
}

.php-code code {
    display: block;
    min-width: max-content;
}

.code-line {
    display: block;
    min-height: 1.7em;
    padding: 0 18px 0 56px;
    counter-increment: code-line;
}

.php-code code {
    counter-reset: code-line;
}

.code-line::before {
    position: absolute;
    width: 32px;
    margin-left: -43px;
    color: #767685;
    text-align: right;
    content: counter(code-line);
    user-select: none;
}

.code-keyword { color: #ff9c6e; }
.code-string { color: #b5dc85; }
.code-variable { color: #82c7f2; }
.code-number { color: #ceb3ff; }
.code-comment { color: #858594; font-style: italic; }
.code-function { color: #f2d27a; }
.code-operator { color: #f2f2f7; }

.example-output {
    padding: 13px 16px;
    border-top: 1px solid var(--border);
    background: var(--card);
}

.example-output strong {
    color: var(--muted);
    font-size: 12px;
}

.example-output pre {
    margin: 7px 0 0;
    color: var(--foreground);
    font: 14px/1.6 Consolas, "Courier New", monospace;
    white-space: pre-wrap;
}

.practice-card,
.playground-card {
    padding: 20px;
}

.practice-card fieldset {
    display: grid;
    gap: 10px;
    margin: 0 0 16px;
    padding: 0;
    border: 0;
}

.practice-card legend {
    margin-bottom: 12px;
    color: var(--foreground);
    font-size: 17px;
    font-weight: 600;
}

.practice-choice {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 11px 12px;
    border: 1px solid var(--border);
    border-radius: 8px;
    color: var(--foreground);
    cursor: pointer;
}

.practice-choice:has(input:checked) {
    border-color: var(--primary);
    background: var(--secondary);
}

.practice-feedback {
    min-height: 24px;
    margin: 12px 0 0;
}

.practice-feedback[data-result="correct"] { color: var(--success); }
.practice-feedback[data-result="incorrect"],
.practice-feedback[data-result="error"] { color: var(--danger); }

.playground-card > p:not(.tutorial-eyebrow) {
    color: var(--muted);
    line-height: 1.6;
}

.playground-card textarea {
    display: block;
    width: 100%;
    min-height: 120px;
    margin: 12px 0;
    padding: 14px;
    border: 1px solid #3b3b4b;
    border-radius: 9px;
    background: #171720;
    color: #eee;
    font: 14px/1.6 Consolas, "Courier New", monospace;
}

.tutorial-empty {
    margin-top: 24px;
    padding: 22px;
    border: 1px solid var(--border);
    border-radius: 12px;
    background: var(--card);
    color: var(--muted);
}

.search-page-form {
    display: flex;
    max-width: 720px;
    margin: 24px 0;
}

.search-page-form input {
    border-radius: 8px 0 0 8px;
}

.search-page-form .tutorial-button {
    border-radius: 0 8px 8px 0;
}

.search-result-count {
    color: var(--muted);
}

.search-results {
    display: grid;
    max-width: 850px;
    gap: 12px;
}

.search-result {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 20px;
    padding: 20px;
}

.search-result h2 {
    margin-bottom: 6px;
    font-size: 19px;
}

.search-result .tutorial-eyebrow,
.search-result p {
    margin-bottom: 5px;
}

.search-result > a {
    flex: 0 0 auto;
    font-size: 22px;
}

mark {
    border-radius: 3px;
    background: var(--warning);
    color: var(--background);
}

.tutorial-footer {
    padding: 22px 0;
    border-top: 1px solid var(--border);
    background: var(--card);
    color: var(--muted);
    font-size: 14px;
}

.tutorial-drawer-backdrop:not([hidden]) {
    position: fixed;
    z-index: 39;
    inset: 0;
    background: rgb(0 0 0 / 48%);
}

@media (max-width: 1050px) {
    .catalog-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .course-reader {
        grid-template-columns: minmax(215px, 245px) minmax(0, 1fr);
    }

    .on-page-panel {
        display: none;
    }

}

@media (max-width: 760px) {
    .tutorial-main,
    .tutorial-footer-inner {
        width: min(100% - 28px, 1180px);
    }

    .site-header > .container {
        width: min(1180px, calc(100% - 28px));
    }

    .site-header .header-wrapper {
        min-height: 68px;
        gap: 12px;
    }

    .site-header .logo img {
        width: 190px;
    }

    .site-header .header-menu li {
        padding-right: 2px;
        padding-left: 2px;
    }

    .site-header .menu-link {
        font-size: 13px;
    }

    .tutorial-tools,
    .tutorial-main,
    .tutorial-footer-inner {
        width: min(100% - 28px, 1180px);
    }

    .tutorial-main.tutorial-lesson-main {
        width: min(100% - 28px, 1180px);
    }

    .tutorial-tools {
        flex-wrap: wrap;
        gap: 10px;
    }

    .tutorial-menu-toggle {
        display: inline-flex;
    }

    .tutorial-search {
        flex-basis: 100%;
        max-width: none;
    }

    .tutorial-header-progress {
        display: none;
    }

    .tutorial-main {
        min-height: calc(100vh - 190px);
        padding: 27px 0 42px;
    }

    .site-header .header-wrapper {
        display: grid;
        grid-template-columns: minmax(0, 1fr) auto;
    }

    .site-header .logo img {
        width: min(210px, 48vw);
    }

    .site-header .header-btn-wrapper {
        grid-column: 2;
        grid-row: 1;
    }

    .site-header .header-btn-wrapper .orange-btn {
        font-size: 14px;
    }

    .tutorial-tools > .tutorial-theme-toggle {
        margin-left: 0;
    }

    .course-hero {
        min-height: auto;
    }

    .catalog-grid {
        grid-template-columns: 1fr;
        max-width: 520px;
        margin: 0 auto;
    }

    .catalog-card-art {
        min-height: 140px;
    }

    .course-hero-art {
        width: 110px;
        height: 110px;
        font-size: 17px;
    }

    .course-hero-art span {
        margin-top: 17px;
    }

    .course-hero-art i {
        margin-top: -48px;
        font-size: 35px;
    }

    .course-stats {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .progress-dashboard,
    .continue-card,
    .section-heading,
    .course-overview-heading {
        align-items: flex-start;
        flex-direction: column;
        gap: 12px;
    }

    .progress-dashboard progress {
        max-width: none;
    }

    .section-heading {
        margin-top: 30px;
    }

    .course-reader {
        display: block;
        margin-top: 18px;
    }

    .course-sidebar {
        position: fixed;
        z-index: 40;
        top: 0;
        bottom: 0;
        left: 0;
        width: min(340px, 88vw);
        max-height: 100vh;
        padding: 18px 15px 28px;
        border-radius: 0 16px 16px 0;
        transform: translateX(-105%);
        transition: transform 180ms ease;
    }

    .course-sidebar.is-open {
        transform: translateX(0);
    }

    .sidebar-heading button {
        display: block;
    }

    .overview-content {
        padding: 20px;
    }

    .lesson-content {
        padding: 20px 16px;
    }

    .lesson-navigation {
        align-items: stretch;
    }

    .lesson-navigation .tutorial-button {
        max-width: 58%;
        text-align: center;
    }

    .completion-card {
        align-items: flex-start;
        flex-direction: column;
    }

    .section-card-grid {
        grid-template-columns: 1fr;
    }

}

@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        scroll-behavior: auto !important;
        transition-duration: 0.01ms !important;
        animation-duration: 0.01ms !important;
    }
}

.tutorial-footer-inner {
    max-width: 1180px;
}
    align-items: start;
    gap: 28px;
    margin-top: 26px;
}

.tutorial-panel {
    padding: 22px;
}

.lesson-sidebar {
    position: sticky;
    top: 20px;
}

.lesson-sidebar h2 {
    margin-bottom: 16px;
    font-size: 18px;
}

.lesson-list {
    display: grid;
    gap: 7px;
    margin: 0;
    padding: 0;
    list-style: none;
}

.lesson-list a {
    display: block;
    padding: 10px 12px;
    border-radius: 9px;
    color: #464653;
}

.lesson-list a:hover,
.lesson-list a.is-active {
    background: #fff2e9;
    color: #d95700;
}

.lesson-content {
    min-height: 300px;
    padding: clamp(22px, 4vw, 42px);
}

.lesson-body {
    color: #464653;
    font-size: 17px;
    line-height: 1.85;
    white-space: pre-wrap;
    overflow-wrap: anywhere;
}

.lesson-navigation {
    display: flex;
    justify-content: space-between;
    gap: 16px;
    margin-top: 28px;
}

.tutorial-button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 42px;
    padding: 10px 16px;
    border: 0;
    border-radius: 9px;
    background: #f56a00;
    color: #fff;
    font-weight: 600;
}

.tutorial-button:hover {
    background: #d95700;
    color: #fff;
}

.tutorial-empty {
    margin-top: 24px;
    padding: 22px;
    border-radius: 12px;
    background: #fff;
    color: #686979;
}

.tutorial-footer {
    padding: 22px 0;
    border-top: 1px solid #e9e9ef;
    background: #fff;
    color: #777887;
    font-size: 14px;
}

@media (max-width: 700px) {
    .tutorial-main,
    .tutorial-footer-inner {
        width: min(100% - 28px, 1180px);
    }

    .tutorial-tools {
        min-height: 0;
    }

    .tutorial-main {
        padding-top: 30px;
    }

    .tutorial-layout {
        grid-template-columns: 1fr;
        gap: 16px;
    }

    .lesson-sidebar {
        position: static;
    }
}

@media (max-width: 520px) {
    .process-steps {
        grid-template-columns: minmax(0, 1fr);
        gap: 28px;
    }

    .process-steps li {
        min-height: 0;
    }

    .process-steps li:not(:last-child)::after {
        top: auto;
        right: auto;
        bottom: -28px;
        left: 50%;
        transform: translateX(-50%) rotate(90deg);
    }
}