:root {
    --bg: #fffaf2;
    --bg-soft: #f7f4ff;
    --surface: rgba(255, 255, 255, 0.88);
    --surface-strong: #ffffff;
    --text: #20303a;
    --muted: #617280;
    --line: rgba(32, 48, 58, 0.12);
    --primary: #0f9d8f;
    --primary-deep: #0c766b;
    --accent: #ff8f5a;
    --accent-soft: #ffd7bf;
    --lavender: #cfc9ff;
    --gold: #ffcf5c;
    --success: #2d995b;
    --warning: #d67a2c;
    --danger: #b6492d;
    --shadow: 0 24px 60px rgba(48, 58, 76, 0.12);
    --radius-lg: 28px;
    --radius-md: 18px;
    --radius-sm: 12px;
    --font-display: "Trebuchet MS", "Aptos", "Candara", sans-serif;
    --font-body: "Segoe UI Variable", "Aptos", "Lucida Sans", sans-serif;
}

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

html {
    scroll-behavior: smooth;
}

body {
    margin: 0;
    font-family: var(--font-body);
    color: var(--text);
    background:
        radial-gradient(circle at top left, rgba(255, 207, 92, 0.28), transparent 26rem),
        radial-gradient(circle at top right, rgba(207, 201, 255, 0.35), transparent 28rem),
        linear-gradient(180deg, #fffdf7 0%, #fff7ee 45%, #f7f7ff 100%);
}

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

p {
    color: var(--muted);
    line-height: 1.7;
}

label {
    display: block;
    margin-bottom: 0.45rem;
    font-weight: 700;
}

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

h1,
h2,
h3,
h4 {
    font-family: var(--font-display);
    color: var(--text);
    line-height: 1.1;
    margin: 0 0 0.85rem;
}

pre {
    margin: 0;
    white-space: pre-wrap;
}

.container {
    width: min(1120px, calc(100vw - 2rem));
    margin: 0 auto;
}

.narrow {
    width: min(760px, 100%);
}

.site-header {
    position: sticky;
    top: 0;
    z-index: 20;
    backdrop-filter: blur(18px);
    background: rgba(255, 250, 242, 0.8);
    border-bottom: 1px solid rgba(32, 48, 58, 0.08);
}

.nav-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    padding: 1rem 0;
}

.brand {
    display: flex;
    align-items: center;
    gap: 0.9rem;
}

.brand-mark {
    width: 2.9rem;
    height: 2.9rem;
    border-radius: 18px;
    display: grid;
    place-items: center;
    background: linear-gradient(135deg, var(--primary), #49c9bb);
    color: white;
    font-weight: 800;
    letter-spacing: 0.04em;
}

.brand-text {
    display: flex;
    flex-direction: column;
    font-size: 0.95rem;
}

.brand-text span {
    color: var(--muted);
}

.site-nav {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 0.9rem;
}

.site-nav-logout {
    margin: 0;
}

.site-nav a {
    color: var(--muted);
    font-weight: 600;
}

.nav-pill,
.button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.4rem;
    border-radius: 999px;
    font-weight: 700;
    transition: transform 0.18s ease, box-shadow 0.18s ease, background 0.18s ease;
}

.nav-pill {
    padding: 0.85rem 1.15rem;
    background: white;
    box-shadow: 0 10px 24px rgba(48, 58, 76, 0.1);
}

.nav-pill-button {
    border: 0;
    color: var(--muted);
    cursor: pointer;
    font: inherit;
}

.button {
    padding: 0.92rem 1.35rem;
    border: 0;
    cursor: pointer;
    box-shadow: 0 16px 30px rgba(48, 58, 76, 0.08);
}

.button:hover,
.nav-pill:hover {
    transform: translateY(-1px);
}

.button-primary {
    background: linear-gradient(135deg, var(--primary), #55b9ff);
    color: white;
}

.button-secondary {
    background: rgba(255, 255, 255, 0.84);
    color: var(--text);
    border: 1px solid rgba(32, 48, 58, 0.1);
}

.hero {
    padding: 4.5rem 0 3.5rem;
}

.hero-grid,
.two-column,
.login-layout,
.lesson-layout {
    display: grid;
    gap: 1.4rem;
}

.hero-grid {
    grid-template-columns: 1.3fr 0.9fr;
    align-items: center;
}

.hero-copy,
.hero-panel,
.card,
.metric-card,
.flash,
.lesson-sidebar,
.certificate-sheet {
    animation: fade-up 0.55s ease both;
}

.hero-lead {
    font-size: 1.12rem;
    max-width: 58ch;
}

.eyebrow {
    display: inline-flex;
    padding: 0.4rem 0.75rem;
    border-radius: 999px;
    background: rgba(255, 255, 255, 0.75);
    color: var(--primary-deep);
    font-weight: 800;
    letter-spacing: 0.04em;
    text-transform: uppercase;
    font-size: 0.72rem;
    margin-bottom: 1.1rem;
}

.hero h1 {
    font-size: clamp(2.2rem, 6vw, 4.2rem);
    max-width: 15ch;
}

.hero-compact h1 {
    max-width: 18ch;
}

.cta-row,
.card-actions,
.term-row,
.lesson-nav-pair,
.badge-row {
    display: flex;
    gap: 0.85rem;
    flex-wrap: wrap;
    align-items: center;
}

.hero-stats,
.metric-stack {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(130px, 1fr));
    gap: 1rem;
    margin-top: 1.5rem;
}

.hero-stats div,
.metric-stack div,
.metric-card {
    padding: 1rem 1.1rem;
    border-radius: 18px;
    background: rgba(255, 255, 255, 0.72);
    border: 1px solid rgba(32, 48, 58, 0.08);
}

.hero-stats strong,
.metric-stack strong,
.metric-card strong {
    display: block;
    font-size: 1.7rem;
    color: var(--text);
}

.hero-stats span,
.metric-stack span,
.metric-card span {
    color: var(--muted);
}

.card,
.certificate-sheet {
    background: var(--surface);
    border: 1px solid rgba(255, 255, 255, 0.7);
    box-shadow: var(--shadow);
    border-radius: var(--radius-lg);
    padding: 1.6rem;
}

.glow-card {
    background:
        linear-gradient(180deg, rgba(255, 255, 255, 0.95), rgba(249, 252, 255, 0.92)),
        radial-gradient(circle at top right, rgba(255, 143, 90, 0.18), transparent 12rem);
}

.gradient-card {
    background:
        linear-gradient(160deg, rgba(15, 157, 143, 0.12), rgba(255, 207, 92, 0.14)),
        rgba(255, 255, 255, 0.9);
}

.section {
    padding: 1rem 0 4rem;
}

.section-tint {
    background: linear-gradient(180deg, rgba(255, 255, 255, 0), rgba(245, 248, 255, 0.74));
}

.section-heading {
    margin-bottom: 1.6rem;
}

.section-heading h2 {
    font-size: clamp(1.8rem, 4vw, 2.7rem);
    max-width: 20ch;
}

.card-grid {
    display: grid;
    gap: 1.2rem;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
}

.card-grid-wide {
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
}

.track-card,
.lesson-card {
    position: relative;
    overflow: hidden;
}

.track-card::before,
.lesson-card::before {
    content: "";
    position: absolute;
    inset: 0 auto auto 0;
    width: 100%;
    height: 0.4rem;
    background: linear-gradient(90deg, var(--primary), var(--gold));
}

.track-theme-coding-foundations {
    background:
        linear-gradient(150deg, rgba(255, 207, 92, 0.18), rgba(255, 255, 255, 0.92)),
        var(--surface);
}

.track-theme-coding-foundations::before {
    background: linear-gradient(90deg, var(--gold), var(--accent));
}

.track-theme-html-foundations {
    background:
        linear-gradient(150deg, rgba(255, 143, 90, 0.15), rgba(255, 255, 255, 0.94)),
        var(--surface);
}

.track-theme-html-foundations::before {
    background: linear-gradient(90deg, var(--accent), var(--gold));
}

.track-theme-css-foundations {
    background:
        linear-gradient(150deg, rgba(85, 185, 255, 0.16), rgba(255, 255, 255, 0.94)),
        var(--surface);
}

.track-theme-css-foundations::before {
    background: linear-gradient(90deg, #55b9ff, var(--lavender));
}

.track-theme-javascript-foundations {
    background:
        linear-gradient(150deg, rgba(15, 157, 143, 0.14), rgba(255, 255, 255, 0.94)),
        var(--surface);
}

.track-theme-javascript-foundations::before {
    background: linear-gradient(90deg, var(--primary), #55b9ff);
}

.track-theme-python-starter-lab {
    background:
        linear-gradient(150deg, rgba(207, 201, 255, 0.22), rgba(255, 255, 255, 0.94)),
        var(--surface);
}

.track-theme-python-starter-lab::before {
    background: linear-gradient(90deg, var(--lavender), #5d52a5);
}

.card-subtitle,
.muted {
    color: var(--muted);
}

.card-meta {
    display: flex;
    justify-content: space-between;
    gap: 1rem;
    color: var(--muted);
    font-size: 0.94rem;
    margin-bottom: 0.8rem;
}

.pill,
.term-chip {
    display: inline-flex;
    align-items: center;
    padding: 0.42rem 0.78rem;
    border-radius: 999px;
    font-size: 0.86rem;
    font-weight: 700;
}

.pill {
    background: rgba(15, 157, 143, 0.12);
    color: var(--primary-deep);
}

.pill.subtle {
    background: rgba(207, 201, 255, 0.28);
    color: #5d52a5;
}

.term-chip {
    background: rgba(255, 143, 90, 0.14);
    color: #b65828;
}

.lesson-status-pill.status-complete {
    background: rgba(45, 153, 91, 0.14);
    color: var(--success);
}

.lesson-status-pill.status-progress {
    background: rgba(255, 207, 92, 0.24);
    color: #9b6a00;
}

.lesson-status-pill.status-open {
    background: rgba(15, 157, 143, 0.12);
    color: var(--primary-deep);
}

.lesson-status-pill.status-recommended {
    background: rgba(207, 201, 255, 0.32);
    color: #584da8;
}

.text-link {
    color: var(--primary-deep);
    font-weight: 700;
}

.feature-list,
.number-list,
.sidebar-list,
.mini-track ol {
    display: grid;
    gap: 0.9rem;
    padding-left: 1.2rem;
    color: var(--muted);
}

.mini-track {
    margin-top: 1.4rem;
    padding: 1rem 1.1rem;
    border-radius: 20px;
    background: rgba(255, 255, 255, 0.72);
    border: 1px solid rgba(32, 48, 58, 0.08);
}

.stack {
    display: grid;
    gap: 1.1rem;
}

.stack.compact {
    gap: 0.7rem;
}

.section-card h3,
.section-card h2 {
    margin-top: 0.4rem;
}

.rich-text p {
    margin: 0 0 1rem;
}

.callout,
.vocab-box {
    margin-top: 1rem;
    padding: 1rem 1.1rem;
    border-radius: 18px;
    background: rgba(255, 247, 229, 0.92);
    border: 1px solid rgba(214, 122, 44, 0.16);
}

.glossary-inline {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 0.8rem;
}

.mini-term {
    padding: 0.9rem;
    border-radius: 16px;
    background: white;
    border: 1px solid rgba(32, 48, 58, 0.08);
}

.progress-bar {
    width: 100%;
    height: 0.8rem;
    border-radius: 999px;
    background: rgba(32, 48, 58, 0.08);
    overflow: hidden;
}

.progress-bar span {
    display: block;
    height: 100%;
    border-radius: inherit;
    background: linear-gradient(135deg, var(--primary), var(--gold));
}

.progress-label {
    font-weight: 700;
    color: var(--muted);
    margin-top: 0.7rem;
}

.progress-card {
    display: grid;
    grid-template-columns: 1.1fr 1fr auto;
    gap: 1rem;
    align-items: center;
}

.progress-meta {
    display: grid;
    gap: 0.4rem;
}

.lesson-layout {
    grid-template-columns: 300px minmax(0, 1fr);
    align-items: start;
}

.lesson-sidebar {
    position: sticky;
    top: 6.2rem;
}

.sidebar-list {
    padding-left: 0;
    list-style: none;
}

.sidebar-list li {
    display: flex;
    justify-content: space-between;
    gap: 0.8rem;
    padding: 0.7rem 0;
    border-bottom: 1px solid rgba(32, 48, 58, 0.08);
}

.sidebar-lesson-copy {
    display: grid;
    gap: 0.22rem;
}

.sidebar-progress {
    color: var(--muted);
    font-size: 0.88rem;
}

.sidebar-list li.done strong {
    color: var(--success);
}

.quiz-form,
.choice-list {
    display: grid;
    gap: 1rem;
}

.quiz-question {
    padding: 1rem 0;
    border-top: 1px solid rgba(32, 48, 58, 0.08);
}

.choice-item {
    display: flex;
    gap: 0.8rem;
    align-items: flex-start;
    padding: 0.9rem 1rem;
    border: 1px solid rgba(32, 48, 58, 0.1);
    border-radius: 16px;
    background: rgba(255, 255, 255, 0.86);
}

.review-row {
    padding: 1rem 1.1rem;
    border-radius: 18px;
}

.review-good {
    background: rgba(45, 153, 91, 0.1);
}

.review-warn {
    background: rgba(214, 122, 44, 0.12);
}

.form-input,
.code-input,
select.form-input,
textarea.form-input {
    width: 100%;
    padding: 0.95rem 1rem;
    border-radius: 16px;
    border: 1px solid rgba(32, 48, 58, 0.14);
    background: rgba(255, 255, 255, 0.92);
    color: var(--text);
    font: inherit;
}

.button:focus-visible,
.text-link:focus-visible,
.form-input:focus-visible,
.code-input:focus-visible,
.preview-frame:focus-visible,
.practice-lab-output:focus-visible {
    outline: 3px solid rgba(15, 157, 143, 0.56);
    outline-offset: 3px;
}

.code-input,
.code-block {
    font-family: Consolas, "Courier New", monospace;
}

.code-block {
    padding: 1rem 1.1rem;
    border-radius: 18px;
    background: rgba(32, 48, 58, 0.95);
    color: #fff8eb;
    overflow-x: auto;
}

.exercise-card {
    padding: 1rem;
    border: 1px solid rgba(32, 48, 58, 0.08);
    border-radius: 20px;
    background: rgba(255, 255, 255, 0.72);
}

.practice-lab-shell {
    display: grid;
    gap: 0.85rem;
    margin-top: 1rem;
    padding: 1rem;
    border-radius: 22px;
    border: 1px solid rgba(15, 157, 143, 0.18);
    background:
        linear-gradient(135deg, rgba(15, 157, 143, 0.1), rgba(255, 207, 92, 0.18)),
        rgba(255, 255, 255, 0.86);
}

.practice-lab-header {
    display: flex;
    gap: 1rem;
    align-items: flex-start;
    justify-content: space-between;
    flex-wrap: wrap;
}

.practice-lab-status {
    padding: 0.75rem 0.9rem;
    border-radius: 14px;
    border: 1px solid rgba(32, 48, 58, 0.1);
    background: rgba(255, 255, 255, 0.82);
    color: var(--muted);
    font-weight: 700;
}

.practice-lab-status[data-practice-lab-status-state="running"] {
    background: rgba(255, 207, 92, 0.2);
    color: #795c12;
}

.practice-lab-status[data-practice-lab-status-state="completed"] {
    background: rgba(45, 153, 91, 0.12);
    color: var(--success);
}

.practice-lab-status[data-practice-lab-status-state="failed"] {
    background: rgba(255, 143, 90, 0.15);
    color: var(--danger);
}

.practice-lab-draft-status {
    padding: 0.72rem 0.9rem;
    border-radius: 14px;
    background: rgba(245, 248, 255, 0.86);
    color: var(--muted);
    font-size: 0.95rem;
}

.practice-lab-draft-status[data-practice-lab-draft-state="saving"] {
    background: rgba(255, 207, 92, 0.18);
    color: #795c12;
}

.practice-lab-draft-status[data-practice-lab-draft-state="draft"] {
    background: rgba(15, 157, 143, 0.1);
    color: var(--accent);
}

.practice-lab-draft-status[data-practice-lab-draft-state="failed"] {
    background: rgba(255, 143, 90, 0.14);
    color: var(--danger);
}

.practice-lab-code {
    min-height: 220px;
    resize: vertical;
    background: rgba(32, 48, 58, 0.95);
    color: #fff9f0;
    border-color: rgba(32, 48, 58, 0.25);
}

.practice-lab-preview {
    background: rgba(240, 251, 248, 0.88);
    border-color: rgba(15, 157, 143, 0.16);
}

.practice-lab-frame {
    background: white;
}

.practice-lab-output {
    min-height: 120px;
    padding: 1rem;
    border-radius: 16px;
    background: rgba(32, 48, 58, 0.96);
    color: #fff9f0;
    overflow-x: auto;
    font-family: Consolas, "Courier New", monospace;
}

.practice-lab-hints {
    border-color: rgba(15, 157, 143, 0.2);
}

.practice-lab-hint-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 0.55rem;
    margin-top: 0.75rem;
}

.practice-lab-hint-panel {
    padding: 0.85rem;
    border: 1px solid rgba(15, 157, 143, 0.18);
    border-radius: 14px;
    background: rgba(255, 255, 255, 0.78);
}

.practice-lab-hint-panel:focus-visible {
    outline: 3px solid rgba(15, 157, 143, 0.42);
    outline-offset: 2px;
}

.practice-lab-recovery[hidden] {
    display: none;
}

.terminal-exercise-card {
    background:
        linear-gradient(180deg, rgba(255, 255, 255, 0.95), rgba(250, 247, 239, 0.9)),
        rgba(255, 255, 255, 0.86);
}

.practice-terminal {
    margin-top: 1rem;
    border-radius: 22px;
    overflow: hidden;
    border: 1px solid rgba(32, 48, 58, 0.08);
    box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.35);
    background: linear-gradient(180deg, #f8fdfc, #fff8ed);
}

.terminal-header {
    display: grid;
    grid-template-columns: auto 1fr auto;
    align-items: center;
    gap: 0.8rem;
    padding: 0.9rem 1rem;
    background: linear-gradient(90deg, rgba(15, 157, 143, 0.12), rgba(255, 207, 92, 0.2));
    border-bottom: 1px solid rgba(32, 48, 58, 0.08);
}

.terminal-dots {
    display: inline-flex;
    gap: 0.35rem;
}

.terminal-dots span {
    width: 0.7rem;
    height: 0.7rem;
    border-radius: 999px;
    background: white;
    border: 1px solid rgba(32, 48, 58, 0.1);
}

.terminal-screen {
    display: grid;
    gap: 0.8rem;
    padding: 1rem;
}

.terminal-line {
    display: flex;
    gap: 0.65rem;
    align-items: flex-start;
    font-family: Consolas, "Courier New", monospace;
    color: var(--text);
}

.terminal-prompt {
    min-width: 5.2rem;
    font-weight: 700;
    color: var(--primary-deep);
}

.terminal-code {
    padding: 1rem 1.1rem;
    border-radius: 18px;
    background: rgba(32, 48, 58, 0.92);
    color: #fff9f0;
    overflow-x: auto;
    font-family: Consolas, "Courier New", monospace;
}

.terminal-response-wrap {
    display: grid;
    grid-template-columns: auto minmax(0, 1fr);
    gap: 0.75rem;
    align-items: start;
}

.terminal-inline-prompt {
    min-width: auto;
    padding-top: 1rem;
}

.content-ops-stack {
    display: grid;
    gap: 1.5rem;
}

.content-ops-filters {
    display: grid;
    gap: 1rem;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    align-items: end;
}

.content-ops-filters label,
.content-ops-filter-actions,
.content-ops-inline-form {
    display: grid;
    gap: 0.55rem;
}

.content-ops-filter-actions {
    align-self: end;
}

.content-ops-table-wrap {
    overflow-x: auto;
}

.content-ops-table {
    width: 100%;
    border-collapse: collapse;
    min-width: 1360px;
}

.progress-ops-table {
    min-width: 1240px;
}

.content-ops-table th,
.content-ops-table td {
    padding: 0.85rem 0.75rem;
    border-bottom: 1px solid rgba(32, 48, 58, 0.08);
    vertical-align: top;
    text-align: left;
}

.content-ops-table th {
    font-size: 0.82rem;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: var(--muted);
}

.content-ops-links {
    display: grid;
    gap: 0.35rem;
}

.content-ops-badges {
    display: flex;
    gap: 0.45rem;
    flex-wrap: wrap;
}

.content-ops-select {
    min-width: 11rem;
}

.content-ops-brief-header {
    display: flex;
    gap: 1rem;
    justify-content: space-between;
    align-items: flex-start;
    flex-wrap: wrap;
}

.content-ops-meta-grid,
.content-ops-form-grid,
.content-ops-checklist-grid {
    display: grid;
    gap: 1rem;
}

.content-ops-meta-grid,
.content-ops-checklist-grid {
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
}

.content-ops-form-grid {
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
}

.content-ops-span-2 {
    grid-column: span 2;
}

.content-ops-check-row {
    display: flex;
    gap: 0.7rem;
    align-items: center;
    padding: 0.95rem 1rem;
    border-radius: 16px;
    background: rgba(255, 255, 255, 0.86);
    border: 1px solid rgba(32, 48, 58, 0.08);
}

.content-ops-check-row input {
    width: 1rem;
    height: 1rem;
}

.content-ops-outline-card {
    padding: 1rem;
    border-radius: 20px;
    border: 1px solid rgba(32, 48, 58, 0.08);
    background: rgba(255, 255, 255, 0.76);
}

.content-ops-inline-delete {
    margin-top: -0.2rem;
}

.progress-ops-lesson-row,
.progress-ops-history-row {
    align-items: flex-start;
}

.button-small {
    padding: 0.7rem 0.95rem;
    border-radius: 999px;
}

.terminal-answer-input {
    min-height: 126px;
}

.practice-action-row {
    display: flex;
    gap: 0.8rem;
    flex-wrap: wrap;
    align-items: center;
}

.practice-feedback[hidden] {
    display: none;
}

.exercise-preview {
    margin-top: 1rem;
    padding: 1rem 1.1rem;
    border-radius: 18px;
    background: rgba(245, 248, 255, 0.82);
    border: 1px solid rgba(32, 48, 58, 0.08);
}

.preview-frame {
    display: block;
    width: 100%;
    min-height: 220px;
    border: 1px solid rgba(32, 48, 58, 0.12);
    border-radius: 18px;
    background: white;
}

.reorder-row,
.simple-list-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    padding: 0.8rem 0;
    border-bottom: 1px solid rgba(32, 48, 58, 0.08);
}

.simple-list-row:last-child,
.reorder-row:last-child {
    border-bottom: 0;
}

.lesson-end-nav {
    display: grid;
    gap: 1rem;
}

.membership-card,
.certificate-card {
    position: relative;
}

@media (max-width: 720px) {
    .content-ops-span-2 {
        grid-column: auto;
    }
}

.membership-featured {
    border-color: rgba(15, 157, 143, 0.28);
    box-shadow: 0 24px 70px rgba(15, 157, 143, 0.12);
}

.login-layout {
    grid-template-columns: 1fr 0.9fr;
    align-items: stretch;
}

.flash-stack {
    padding-top: 1rem;
}

.flash {
    padding: 1rem 1.1rem;
    border-radius: 18px;
    background: rgba(207, 201, 255, 0.28);
    color: #51459f;
    margin-bottom: 0.8rem;
}

.flash-success {
    background: rgba(45, 153, 91, 0.12);
    color: var(--success);
}

.flash-error {
    background: rgba(255, 143, 90, 0.15);
    color: var(--danger);
}

.footer-grid {
    display: grid;
    grid-template-columns: 1.3fr 1fr 1fr;
    gap: 1rem;
    padding: 2.2rem 0 3rem;
}

.site-footer {
    margin-top: 2rem;
    border-top: 1px solid rgba(32, 48, 58, 0.08);
    background: rgba(255, 255, 255, 0.5);
}

.site-footer a {
    display: block;
    margin-bottom: 0.6rem;
    color: var(--muted);
}

.certificate-sheet {
    text-align: center;
    padding: 3rem 2rem;
    background:
        linear-gradient(180deg, rgba(255, 255, 255, 0.98), rgba(250, 252, 255, 0.92)),
        radial-gradient(circle at top right, rgba(255, 207, 92, 0.25), transparent 15rem);
}

.certificate-copy {
    font-size: 1rem;
    letter-spacing: 0.08em;
    text-transform: uppercase;
}

.certificate-name {
    font-size: clamp(2rem, 4vw, 3rem);
}

.certificate-track {
    font-size: clamp(1.7rem, 3vw, 2.4rem);
}

.certificate-meta {
    display: flex;
    justify-content: center;
    gap: 1rem;
    flex-wrap: wrap;
    margin-top: 1.4rem;
    color: var(--muted);
}

.certificate-actions {
    justify-content: center;
    margin-top: 1rem;
}

.button-row {
    display: flex;
    gap: 0.8rem;
    flex-wrap: wrap;
    margin-top: 1rem;
}

.align-right {
    align-items: flex-end;
    display: flex;
    flex-direction: column;
    gap: 0.35rem;
}

.top-gap {
    margin-top: 1rem;
}

.timeline-row {
    padding: 0.9rem 0;
    border-bottom: 1px solid rgba(32, 48, 58, 0.08);
}

.timeline-row:last-child {
    border-bottom: 0;
}

.card-actions form {
    display: inline-flex;
    margin: 0;
}

.checkbox-row {
    display: flex;
    gap: 0.6rem;
    align-items: center;
    color: var(--muted);
}

@keyframes fade-up {
    from {
        opacity: 0;
        transform: translateY(16px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@media (max-width: 900px) {
    .hero-grid,
    .login-layout,
    .lesson-layout,
    .footer-grid,
    .progress-card,
    .two-column {
        grid-template-columns: 1fr;
    }

    .lesson-sidebar {
        position: static;
    }

    .site-nav {
        justify-content: flex-end;
    }
}

@media (max-width: 640px) {
    .nav-row {
        align-items: flex-start;
        flex-direction: column;
    }

    .site-nav {
        justify-content: flex-start;
    }

    .hero {
        padding-top: 3.4rem;
    }

    .hero h1 {
        max-width: none;
    }

    .reorder-row,
    .simple-list-row {
        align-items: flex-start;
        flex-direction: column;
    }

    .practice-lab-shell,
    .practice-lab-preview,
    .exercise-card {
        padding: 0.85rem;
        border-radius: 16px;
    }

    .practice-lab-code {
        min-height: 180px;
        font-size: 0.94rem;
    }

    .practice-lab-output,
    .preview-frame {
        min-height: 160px;
        max-width: 100%;
    }

    .practice-action-row,
    .practice-lab-recovery .button-row,
    .practice-lab-hint-actions {
        align-items: stretch;
        flex-direction: column;
    }

    .practice-action-row .button,
    .practice-lab-recovery .button,
    .practice-lab-hint-actions .button {
        width: 100%;
        justify-content: center;
    }
}

@media print {
    .site-header,
    .site-footer,
    .flash-stack,
    .certificate-actions {
        display: none !important;
    }

    body {
        background: white;
    }

    .certificate-sheet {
        box-shadow: none;
        border: 1px solid #ddd;
    }
}