:root {
    --bg: #f3f7fb;
    --bg-2: #eaf3ff;
    --card: #ffffff;
    --primary: #0f766e;
    --primary-dark: #0b5d5a;
    --primary-soft: #dff7f5;
    --text: #122033;
    --muted: #5b6b7f;
    --border: #dfe7f1;
    --shadow: 0 16px 40px rgba(15, 23, 42, 0.08);
    --success: #138a5d;
    --success-soft: #eafaf3;
    --error: #d63b50;
    --error-soft: #fff1f3;
    --pass: #e8fff0;
    --fail: #fff1f2;
    --pass-text: #166534;
    --fail-text: #991b1b;
    --toggle-bg: rgba(255, 255, 255, 0.12);
    --toggle-border: rgba(255, 255, 255, 0.18);
    --nav-menu-bg: #243c5e;
    --content-width: min(100%, 1600px);
    --page-gutter: clamp(16px, 2vw, 40px);
}

:root[data-theme="dark"] {
    color-scheme: dark;
    --bg: #0b1220;
    --bg-2: #111c2f;
    --card: #111c2d;
    --text: #edf5ff;
    --muted: #a5b7cb;
    --border: rgba(148, 163, 184, 0.18);
    --primary: #27c7c2;
    --primary-dark: #1ca8a5;
    --primary-soft: rgba(39, 199, 194, 0.14);
    --success-soft: rgba(19, 138, 93, 0.12);
    --error-soft: rgba(214, 59, 80, 0.12);
    --pass: rgba(19, 138, 93, 0.14);
    --fail: rgba(214, 59, 80, 0.14);
    --pass-text: #bbf7d0;
    --fail-text: #fecaca;
    --toggle-bg: rgba(255, 255, 255, 0.08);
    --toggle-border: rgba(255, 255, 255, 0.18);
    --nav-menu-bg: #243c5e;
}

* {
    box-sizing: border-box;
}

@view-transition {
    navigation: auto;
}

::view-transition-old(root),
::view-transition-new(root) {
    animation-duration: 180ms;
    animation-timing-function: ease-in-out;
}

html.page-leaving body {
    opacity: 0;
}

html {
    scroll-behavior: smooth;
    min-height: 100%;
    background:
        linear-gradient(rgba(238, 246, 251, 0.78), rgba(248, 250, 252, 0.84)),
        url("branding/background.webp") center center / cover fixed no-repeat;
    background-color: #eef6fb;
}

:root[data-theme="dark"] {
    background:
        linear-gradient(rgba(7, 18, 31, 0.78), rgba(10, 20, 34, 0.86)),
        url("branding/background.webp") center center / cover fixed no-repeat;
    background-color: #07121f;
}

body {
    margin: 0;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    font-family: Arial, Helvetica, sans-serif;
    background: transparent;
    color: var(--text);
    line-height: 1.6;
}

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

.site-header {
    background: linear-gradient(135deg, #243c5e 0%, #58708d 100%);
    color: #fff;
    box-shadow: 0 10px 26px rgba(8, 18, 36, 0.15);
    position: sticky;
    top: 0;
    z-index: 10;
}

.header-inner,
.footer-inner {
    max-width: var(--content-width);
    width: min(var(--content-width), calc(100% - var(--page-gutter)));
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    padding: 18px 0;
}

.site-header .header-inner {
    display: flex !important;
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
    gap: 20px;
    min-height: 72px;
}

.site-header .brand {
    display: flex;
    align-items: center;
    justify-content: center;
    width: auto;
    font-family: 'Montserrat', 'Segoe UI', sans-serif;
    font-size: 1.5rem;
    font-weight: 800;
    letter-spacing: 0.06em;
    color: #f8fbff;
    flex-shrink: 0;
    line-height: 1;
    min-height: 44px;
    margin: 0;
    align-self: center;
}

.site-header .brand img {
    width: min(230px, 30vw);
    height: auto;
}

.site-header .main-nav {
    display: flex;
    gap: 18px;
    align-items: center;
    justify-content: flex-end;
    flex-wrap: wrap;
    margin-left: auto;
    min-height: 44px;
    width: auto;
    line-height: 1;
}

.site-header .main-nav > * {
    display: inline-flex;
    align-items: center;
}

.language-picker {
    display: inline-flex;
    align-items: center;
    flex: 0 0 58px;
    height: 36px;
    margin-left: 2px;
    position: relative;
}

.language-trigger {
    width: 58px;
    height: 36px;
    padding: 0 20px 0 7px;
    border: 1px solid var(--toggle-border);
    border-radius: 8px;
    background: transparent;
    color: rgba(255, 255, 255, 0.9);
    font: inherit;
    font-size: 0.82rem;
    font-weight: 700;
    line-height: 1;
    text-align: left;
    cursor: pointer;
    position: relative;
}

.language-trigger:hover,
.language-picker.is-open .language-trigger {
    background: rgba(255, 255, 255, 0.08);
    color: #fff;
}

.language-trigger::after {
    content: "";
    position: absolute;
    right: 8px;
    top: 50%;
    width: 0;
    height: 0;
    border-left: 4px solid transparent;
    border-right: 4px solid transparent;
    border-top: 5px solid rgba(255, 255, 255, 0.9);
    pointer-events: none;
    transform: translateY(-25%);
}

.language-menu {
    position: absolute;
    top: calc(100% + 6px);
    right: 0;
    z-index: 20;
    display: none;
    width: 58px;
    padding: 4px;
    border: 1px solid var(--toggle-border);
    border-radius: 8px;
    background: var(--nav-menu-bg);
    box-shadow: 0 10px 24px rgba(8, 18, 36, 0.22);
}

.language-picker.is-open .language-menu {
    display: grid;
    gap: 2px;
}

.language-option {
    width: 100%;
    min-height: 28px;
    padding: 4px 6px;
    border: 0;
    border-radius: 5px;
    background: transparent;
    color: #fff;
    font: inherit;
    font-size: 0.82rem;
    font-weight: 700;
    text-align: left;
    cursor: pointer;
}

.language-option:hover {
    background: rgba(255, 255, 255, 0.12);
}

.language-option.is-selected {
    background: var(--primary);
    color: #fff;
}

.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;
}

.theme-toggle {
    margin-left: 6px;
    flex-shrink: 0;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    vertical-align: middle;
}

.nav-toggle {
    display: none;
    flex-shrink: 0;
    width: 40px;
    height: 40px;
    align-items: center;
    justify-content: center;
    border-radius: 8px;
    border: 1px solid var(--toggle-border);
    background: var(--toggle-bg);
    color: #fff;
    cursor: pointer;
    padding: 0;
}

.nav-toggle .nav-toggle-bar {
    display: block;
    width: 20px;
    height: 2px;
    background: #fff;
    border-radius: 2px;
    position: relative;
}

.nav-toggle .nav-toggle-bar::before,
.nav-toggle .nav-toggle-bar::after {
    content: "";
    position: absolute;
    left: 0;
    width: 20px;
    height: 2px;
    background: #fff;
    border-radius: 2px;
}

.nav-toggle .nav-toggle-bar::before {
    top: -6px;
}

.nav-toggle .nav-toggle-bar::after {
    top: 6px;
}

.nav-toggle-label {
    display: none;
}

.main-nav a {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    color: rgba(255, 255, 255, 0.9);
    text-decoration: none;
    font-weight: 600;
    padding: 8px 12px;
    border-radius: 8px;
    transition: background 0.2s ease, color 0.2s ease;
    line-height: 1.2;
}

.main-nav a:hover {
    background: rgba(255, 255, 255, 0.08);
    color: #fff;
}

.main-nav a.active {
    background: rgba(255, 255, 255, 0.14);
    color: #fff;
}

.main-nav a:focus-visible,
.language-trigger:focus-visible,
.language-option:focus-visible,
.theme-toggle:focus-visible,
button:focus-visible,
a:focus-visible,
input:focus-visible,
select:focus-visible,
textarea:focus-visible {
    outline: 3px solid rgba(39, 199, 194, 0.7);
    outline-offset: 3px;
}

.nav-icon,
.page-icon svg,
.feature-icon svg {
    width: 18px;
    height: 18px;
    display: block;
    stroke: #fff;
    fill: none;
    stroke-width: 2;
    stroke-linecap: round;
    stroke-linejoin: round;
}

.nav-link {
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

.page-icon {
    width: 48px;
    height: 48px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border-radius: 14px;
    background: rgba(255, 255, 255, 0.08);
    border: 1px solid rgba(255, 255, 255, 0.12);
    color: #fff;
    flex-shrink: 0;
}

.page-icon svg {
    width: 24px;
    height: 24px;
}

.page-header {
    display: flex;
    align-items: center;
    gap: 14px;
    margin-bottom: 18px;
}

.page-header > div:last-child {
    min-width: 0;
    flex: 1;
}

.page-header p.eyebrow,
.page-header h1 {
    margin: 0;
}

.page-header h1 {
    line-height: 1.15;
}

.metar-subheader {
    max-width: 680px;
    margin: 6px 0 0;
    text-wrap: pretty;
}

.metar-card h1 {
    text-align: left;
}

.practice-mode-help {
    max-width: 640px;
    margin: 8px 0 0;
}

.theme-toggle {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    border-radius: 8px;
    border: 1px solid var(--toggle-border);
    background: var(--toggle-bg);
    color: #fff;
    cursor: pointer;
    transition: transform 0.2s ease, background 0.2s ease;
    flex-shrink: 0;
    justify-self: end;
    padding: 0;
    line-height: 0;
    margin: 0 0 0 6px;
    align-self: center;
    vertical-align: middle;
}

button.theme-toggle {
    margin-top: 0 !important;
    margin-bottom: 0 !important;
    margin-left: 6px !important;
    margin-right: 0 !important;
}

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

.theme-toggle .theme-icon {
    width: 18px;
    height: 18px;
    display: block;
    stroke: currentColor;
    fill: none;
    stroke-width: 2;
    stroke-linecap: round;
    stroke-linejoin: round;
    transition: opacity 0.2s ease;
}

.theme-toggle svg {
    display: block;
    line-height: 0;
}

.theme-toggle .theme-icon.is-dark {
    display: none;
}

:root[data-theme="dark"] .theme-toggle .theme-icon.is-light {
    display: none;
}

:root[data-theme="dark"] .theme-toggle .theme-icon.is-dark {
    display: block;
}

.page-shell {
    flex: 1;
    padding: 56px 0 36px;
}

.container {
    min-height: auto;
    display: block;
    width: min(var(--content-width), calc(100% - var(--page-gutter)));
    margin: 0 auto;
    padding: 0;
}

.page-shell p:not(.eyebrow):not(.score):not(.grade):not(.pass-status):not(.elapsed):not(.answer-line):not(.result-status),
.page-shell li {
    color: var(--muted);
    font-size: 1rem;
    line-height: 1.6;
}

.card,
.contact-card {
    width: min(100%, 820px);
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(8px);
    border: 1px solid var(--border);
    border-radius: 20px;
    box-shadow: var(--shadow);
    padding: 32px;
}

.home-card {
    width: 100%;
    max-width: 100%;
    padding: 56px 36px;
    text-align: center;
    border-radius: 24px;
    background: linear-gradient(135deg, rgba(255,255,255,0.98), rgba(239,247,255,0.97));
    border: 1px solid rgba(148, 163, 184, 0.18);
    box-shadow: 0 20px 45px rgba(15, 23, 42, 0.08);
}

.home-hero {
    max-width: 1100px;
    margin: 0 auto;
}

.home-hero .button-row {
    margin-top: 24px;
    gap: 16px;
}

.home-card .primary-btn {
    min-width: 190px;
    padding: 16px 28px;
    font-size: 1.06rem;
    letter-spacing: 0.02em;
    box-shadow: 0 16px 30px rgba(15, 118, 110, 0.24);
    border: 1px solid rgba(10, 94, 90, 0.2);
    color: #ffffff;
}

.home-card .secondary-btn {
    min-width: 140px;
    padding: 15px 24px;
    border: 1px solid rgba(148, 163, 184, 0.24);
    color: var(--text);
}

.eyebrow {
    text-transform: uppercase;
    letter-spacing: 0.12em;
    font-size: 0.72rem;
    font-weight: 800;
    color: var(--primary-dark);
    margin-bottom: 10px;
}

.home-hero h1,
.card h1,
.topic-summary h2 {
    margin-top: 0;
    margin-bottom: 18px;
    color: var(--text);
    line-height: 1.2;
}

.home-hero h1 {
    font-size: clamp(2.4rem, 4vw, 4rem);
    letter-spacing: -0.04em;
}

.home-hero p {
    margin-bottom: 30px;
}

.roadmap-panel {
    width: 100%;
    margin: -8px auto 30px;
    border: 1px solid rgba(15, 118, 110, 0.16);
    border-radius: 14px;
    overflow: hidden;
    background: var(--primary-soft);
    text-align: left;
}

.roadmap-panel h3 {
    margin: 0;
    padding: 11px 20px;
    background: rgba(15, 118, 110, 0.1);
    color: var(--primary-dark);
    font-size: 1rem;
    font-weight: 800;
    letter-spacing: 0.02em;
}

.roadmap-list {
    margin: 0;
    padding: 14px 20px 14px 42px;
    color: var(--muted);
}

.roadmap-list li {
    padding: 4px 0 4px 6px;
}

.roadmap-list li::marker {
    color: var(--primary);
    font-size: 0.85em;
}

.button-row {
    display: flex;
    gap: 14px;
    justify-content: center;
    align-items: center;
    flex-wrap: wrap;
}

.primary-btn,
.secondary-btn,
button,
.link-button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border-radius: 12px;
    text-decoration: none;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
    font-family: inherit;
    font-size: 1rem;
    font-weight: 700;
    line-height: 1.2;
    border: none;
    cursor: pointer;
    appearance: none;
    -webkit-appearance: none;
    margin: 0;
}

.primary-btn,
button {
    background: linear-gradient(135deg, var(--primary) 0%, #0f9a9c 100%);
    color: #ffffff !important;
    padding: 13px 22px;
    border: 1px solid transparent;
    box-shadow: 0 10px 20px rgba(15, 118, 110, 0.2);
}

.primary-btn:hover,
button:hover,
.secondary-btn:hover,
.link-button:hover {
    transform: translateY(-1px);
}

.secondary-btn,
.link-button {
    background: #edf5ff;
    color: var(--text) !important;
    padding: 13px 22px;
    border: 1px solid var(--border);
}

.site-footer {
    background: #edf3f9;
    border-top: 1px solid var(--border);
    color: var(--text);
}

.footer-inner {
    display: flex;
    justify-content: space-between;
    font-weight: 600;
    color: var(--muted);
    padding: 22px 0;
}

.footer-legal-link {
    color: var(--text);
    border: 1px solid currentColor;
    border-radius: 8px;
    padding: 7px 12px;
    font-size: 0.86rem;
    line-height: 1.2;
    text-decoration: none;
    transition: background-color 0.2s ease, color 0.2s ease;
}

.footer-legal-link:hover,
.footer-legal-link:focus-visible {
    background: var(--text);
    color: var(--card);
}

.gdpr-card {
    max-width: 960px;
}

.gdpr-card h1 {
    margin-bottom: 28px;
}

.gdpr-card p,
.gdpr-card li {
    color: var(--muted);
}

.gdpr-card ul {
    padding-left: 24px;
}

.gdpr-card strong {
    color: var(--text);
}

.success-box,
.error-box {
    padding: 14px 16px;
    border-radius: 12px;
    margin-bottom: 18px;
    font-weight: 600;
}

.success-box {
    color: var(--success);
    background: var(--success-soft);
    border: 1px solid rgba(19, 138, 93, 0.18);
}

.error-box {
    color: var(--error);
    background: var(--error-soft);
    border: 1px solid rgba(214, 59, 80, 0.12);
}

.start-form,
.contact-form,
.form {
    display: flex;
    flex-direction: column;
    gap: 18px;
}

.field-group {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.metar-card {
    margin: 0 auto;
}

.metar-form {
    display: flex;
    flex-direction: column;
    gap: 22px;
}

.metar-report {
    display: grid;
    gap: 12px;
    padding: 18px;
    border-left: 4px solid var(--primary);
    background: var(--primary-soft);
}

.metar-report div {
    display: grid;
    gap: 3px;
    min-width: 0;
}

.metar-report span {
    color: var(--muted);
    font-size: 0.8rem;
    font-weight: 700;
    text-transform: uppercase;
}

.metar-report code {
    overflow-wrap: anywhere;
    font-size: 1.05rem;
    font-weight: 700;
}

.metar-report strong {
    overflow-wrap: anywhere;
}

.taf-lines {
    display: grid;
    gap: 4px;
    margin: 0;
}

.taf-lines code {
    display: block;
    padding-left: 2.2em;
    text-indent: -2.2em;
}

.taf-lines code:first-child {
    padding-left: 0;
    text-indent: 0;
}

.choice-row {
    display: grid;
    gap: 8px;
    margin-top: 26px;
}

.choice-row + .choice-row {
    margin-top: 8px;
}

.choice-row .choice-grid {
    margin-top: 0;
}

.choice-row-title {
    margin: 0;
    color: var(--muted);
    font-size: 0.85rem;
    font-weight: 700;
    letter-spacing: 0.06em;
    text-transform: uppercase;
}

.metar-fields {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 18px;
}

.metar-fields .field-group {
    min-width: 0;
}

.metar-fields label {
    min-height: 2.8em;
    display: flex;
    align-items: flex-end;
}

.metar-questions {
    display: flex;
    flex-direction: column;
    gap: 16px;
    margin-bottom: 20px;
}

.metar-question-heading {
    display: grid;
    grid-template-columns: 64px minmax(0, 1.2fr) minmax(0, 1fr);
    margin-bottom: 12px;
    border: 1px solid var(--border);
    border-radius: 12px;
    overflow: hidden;
}

.metar-question-cell {
    display: flex;
    flex-direction: column;
    gap: 6px;
    min-width: 0;
    padding: 10px 14px;
}

.metar-question-cell + .metar-question-cell {
    border-left: 1px solid var(--border);
}

.metar-question-cell > span {
    color: var(--muted);
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
}

.metar-question-number {
    align-items: center;
    justify-content: center;
    background: var(--primary-soft);
    color: var(--primary-dark);
}

.metar-question-number strong {
    font-size: 1.1rem;
}

.metar-question-report code {
    overflow-wrap: anywhere;
    font-size: 0.9rem;
    font-weight: 700;
}

.metar-question-prompt .question-title {
    padding: 0;
}

.abbr-example {
    display: grid;
    gap: 3px;
    margin: 12px 0;
    padding: 10px 14px;
    border-left: 4px solid var(--primary);
    background: var(--primary-soft);
}

.abbr-example span {
    color: var(--muted);
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
}

.abbr-example code {
    overflow-wrap: anywhere;
    font-weight: 600;
}

.abbr-example mark {
    padding: 0 3px;
    border-radius: 3px;
    background: #ffd84d;
    color: #1b1b1b;
    font-weight: 800;
}

.metar-results {
    margin-top: 32px;
}

.metar-results h2 {
    margin-top: 0;
}

.metar-result-row {
    display: grid;
    grid-template-columns: minmax(170px, 1fr) minmax(0, 2fr);
    gap: 12px;
    align-items: center;
    padding: 12px 14px;
    border: 1px solid var(--border);
    border-radius: 10px;
    margin-bottom: 8px;
}

.metar-result-row strong,
.metar-result-row span,
.metar-result-row small {
    min-width: 0;
    overflow-wrap: anywhere;
}

.metar-result-row small {
    grid-column: 1 / -1;
}

.metar-result-row.result-correct {
    background: var(--pass);
}

.metar-result-row.result-wrong {
    background: var(--fail);
}

label {
    font-weight: 700;
    color: var(--text);
}

input,
select,
textarea {
    width: 100%;
    padding: 12px 14px;
    font-size: 1rem;
    border-radius: 12px;
    border: 1px solid var(--border);
    background: #fff;
    font-family: inherit;
    color: var(--text);
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

input:focus,
select:focus,
textarea:focus {
    outline: none;
    border-color: rgba(15, 118, 110, 0.55);
    box-shadow: 0 0 0 4px rgba(15, 118, 110, 0.12);
}

input:user-invalid,
select:user-invalid,
textarea:user-invalid {
    border-color: var(--error);
}

textarea {
    resize: vertical;
    min-height: 130px;
}

.card .button-row {
    justify-content: flex-start;
}

.home-card .button-row {
    justify-content: center;
}

.gate-card .button-row {
    justify-content: center;
    margin-top: 10px;
}

.choice-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 20px;
    margin-top: 26px;
}

.choice-form {
    display: block;
}

.choice-card {
    width: 100%;
    min-height: 180px;
    padding: 26px 18px;
    border-radius: 20px;
    border: 1px solid rgba(15, 118, 110, 0.2);
    background: linear-gradient(135deg, var(--primary) 0%, #0f9a9c 100%);
    color: #ffffff;
    text-decoration: none;
    box-shadow: 0 14px 26px rgba(15, 118, 110, 0.18);
    font-size: 1.5rem;
    font-weight: 800;
    letter-spacing: 0.04em;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
}

.choice-card:hover {
    background: linear-gradient(135deg, #0d6d69 0%, #0e8b8d 100%);
}

.choice-label {
    display: block;
}

.practice-card {
    max-width: 900px;
    margin: 0 auto;
}

.practice-footer {
    margin-top: 24px;
    justify-content: flex-start;
}

.card {
    width: min(100%, 900px);
    background: rgba(255,255,255,0.96);
    border: 1px solid var(--border);
    border-radius: 16px;
    box-shadow: var(--shadow);
    padding: 32px;
}

.contact-card,
.gdpr-card {
    width: min(100%, 900px);
    max-width: 900px;
    margin: 0 auto;
}

.card.home-card {
    width: 100%;
    max-width: 100%;
    min-width: 0;
}

.card.exam-card {
    width: min(100%, 1600px);
    max-width: 1600px;
}

.topbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 16px;
    margin-bottom: 16px;
}

.timer-box {
    background: linear-gradient(135deg, #f6fbff, #eef7ff);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 10px 14px;
    text-align: center;
    min-width: 130px;
    box-shadow: inset 0 1px 0 rgba(255,255,255,0.7);
}

.timer-box strong {
    font-size: 1.4rem;
    color: var(--primary-dark);
}

.progress-bar {
    width: 100%;
    height: 12px;
    background: #eaf0f7;
    border-radius: 999px;
    overflow: hidden;
    margin-bottom: 24px;
}

.progress-fill {
    width: 0%;
    height: 100%;
    background: linear-gradient(90deg, var(--primary), #6ec4d8);
    transition: width 0.2s ease;
}

.question-block,
.question-card,
.result-item,
.topic-summary {
    border: 1px solid var(--border);
    border-radius: 16px;
    padding: 18px;
    margin-bottom: 20px;
    background: linear-gradient(180deg, #ffffff, #f8fbff);
}

.topic-group {
    border: 1px solid var(--border);
    border-radius: 18px;
    background: linear-gradient(180deg, rgba(15, 118, 110, 0.04), rgba(15, 118, 110, 0.01));
    padding: 18px 18px 8px;
    margin-bottom: 24px;
    box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.5);
}

.topic-group-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    margin-bottom: 12px;
    padding-bottom: 10px;
    border-bottom: 1px solid rgba(15, 118, 110, 0.12);
}

.topic-group-header h3 {
    margin: 0;
    font-size: 1.2rem;
    color: var(--primary-dark);
    text-transform: capitalize;
}

.topic-picker-group {
    margin-top: 8px;
}

.topic-dropdown-wrapper {
    position: relative;
    width: 100%;
}

button.topic-dropdown-trigger {
    width: 100%;
    min-height: 48px;
    padding: 12px 14px;
    border-radius: 12px;
    border: 1px solid var(--border);
    background: #fff;
    color: #122033 !important;
    font: inherit;
    font-weight: 600;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    cursor: pointer;
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

button.topic-dropdown-trigger .topic-dropdown-label,
button.topic-dropdown-trigger .topic-dropdown-caret {
    color: #122033 !important;
}

.topic-dropdown-trigger:hover,
.topic-dropdown-trigger:focus {
    border-color: rgba(15, 118, 110, 0.45);
    box-shadow: 0 0 0 4px rgba(15, 118, 110, 0.08);
    outline: none;
}

.topic-dropdown-label {
    display: inline-block;
    text-align: left;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.topic-dropdown-caret {
    color: var(--muted);
    font-size: 1.05rem;
    transition: transform 0.2s ease;
}

.topic-dropdown-trigger[aria-expanded="true"] .topic-dropdown-caret {
    transform: rotate(180deg);
}

.topic-dropdown-panel {
    position: absolute;
    top: calc(100% + 8px);
    left: 0;
    right: 0;
    z-index: 20;
    display: none;
    flex-direction: column;
    gap: 6px;
    padding: 10px;
    border: 1px solid var(--border);
    border-radius: 12px;
    background: rgba(255, 255, 255, 0.98);
    box-shadow: 0 16px 32px rgba(15, 23, 42, 0.12);
}

.topic-dropdown-wrapper.is-open .topic-dropdown-panel {
    display: flex;
}

.topic-check {
    display: flex;
    align-items: center;
    gap: 10px;
    min-height: 44px;
    padding: 10px 12px;
    border-radius: 10px;
    cursor: pointer;
}

.topic-check:hover {
    background: rgba(15, 118, 110, 0.05);
}

.topic-check input {
    width: 18px;
    height: 18px;
    margin: 0;
    accent-color: var(--primary);
    flex-shrink: 0;
}

.topic-check span {
    color: var(--text);
    font-weight: 600;
}

.topic-check input:checked + span {
    color: var(--primary-dark);
    font-weight: 700;
}

.helper-text {
    color: var(--muted);
    font-size: 0.82rem;
    font-weight: 600;
    display: inline-block;
    margin-top: 6px;
}

:root[data-theme="dark"] .topic-dropdown-trigger,
:root[data-theme="dark"] .topic-dropdown-panel {
    background: rgba(15, 23, 34, 0.9);
    color: var(--text);
    border-color: rgba(148, 163, 184, 0.2);
}

:root[data-theme="dark"] .topic-dropdown-trigger .topic-dropdown-label,
:root[data-theme="dark"] .topic-dropdown-trigger .topic-dropdown-caret {
    color: #ffffff !important;
}

:root[data-theme="dark"] .topic-picker-group > label {
    color: #ffffff;
}

:root[data-theme="dark"] .topic-check:hover {
    background: rgba(39, 199, 194, 0.08);
}

:root[data-theme="dark"] .topic-check input:checked + span {
    color: #d8f5ff;
}

.result-item {
    border-left: 6px solid var(--border);
}

.modal-backdrop[hidden] {
    display: none;
}

.modal-backdrop {
    position: fixed;
    inset: 0;
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
    background: rgba(15, 23, 42, 0.55);
    backdrop-filter: blur(3px);
}

.modal-box {
    width: 100%;
    max-width: 460px;
    padding: 28px;
    background: var(--card);
    color: var(--text);
    border: 1px solid var(--border);
    border-radius: 18px;
    box-shadow: var(--shadow);
}

.modal-box h3 {
    margin: 0 0 10px;
}

.modal-box p {
    margin: 0 0 20px;
    color: var(--muted);
}

.question-heading {
    display: flex;
    align-items: stretch;
    margin: 0 0 12px;
    border: 1px solid var(--border);
    border-radius: 12px;
    overflow: hidden;
}

.question-number {
    flex: 0 0 auto;
    min-width: 52px;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 10px 14px;
    background: var(--primary-soft);
    color: var(--primary-dark);
    font-weight: 800;
    border-right: 1px solid var(--border);
}

.question-title {
    flex: 1;
    margin: 0;
    padding: 10px 14px;
    font-size: inherit;
    line-height: 1.4;
}

.result-item.result-correct {
    background: linear-gradient(180deg, #f0fff5, #f7fffb);
    border-color: rgba(19, 138, 93, 0.24);
    border-left-color: #22c55e;
}

.result-item.result-wrong {
    background: linear-gradient(180deg, #fff5f5, #fffafb);
    border-color: rgba(214, 59, 80, 0.18);
    border-left-color: #ef4444;
}

.answer-row {
    display: flex;
    flex-direction: column;
    gap: 6px;
    margin-top: 12px;
}

.answer-line {
    margin: 0;
    padding: 10px 12px;
    border-radius: 10px;
    font-weight: 700;
}

.answer-correct {
    background: rgba(19, 138, 93, 0.08);
    color: var(--success);
}

.answer-wrong {
    background: rgba(214, 59, 80, 0.08);
    color: var(--error);
}

.result-item.result-unanswered {
    background: linear-gradient(180deg, #fff8e8, #fffcf3);
    border-color: rgba(217, 119, 6, 0.25);
    border-left-color: #f59e0b;
}

.answer-unanswered,
.status-unanswered {
    color: #b45309;
}

.answer-unanswered {
    background: rgba(245, 158, 11, 0.14);
}

:root[data-theme="dark"] .result-item.result-unanswered {
    background: rgba(245, 158, 11, 0.1);
}

:root[data-theme="dark"] .answer-unanswered,
:root[data-theme="dark"] .status-unanswered {
    color: #fbbf24;
}

.result-status {
    margin: 14px 0 0;
    font-weight: 800;
}

.question-text {
    margin-top: 0;
    margin-bottom: 14px;
    font-size: 1.05rem;
}

.option-label {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 12px;
    font-weight: 600;
    cursor: pointer;
    border-radius: 10px;
    transition: background 0.2s ease;
}

.option-label:hover {
    background: #f4f9ff;
    color: #0f172a;
}

.option-label input {
    accent-color: var(--primary);
    width: 18px;
    height: 18px;
}

:root[data-theme="dark"] .option-label {
    color: var(--text);
}

:root[data-theme="dark"] .option-label:hover {
    background: rgba(148, 163, 184, 0.12);
    color: #f8fbff;
}

.primary-button {
    margin-top: 20px;
}

.score {
    font-size: 1.25rem;
    font-weight: 800;
    text-align: center;
    margin-bottom: 10px;
}

.elapsed {
    text-align: center;
    color: var(--muted);
    font-weight: 700;
    margin-bottom: 20px;
}

.success {
    color: var(--success);
    font-weight: 700;
}

.error {
    color: var(--error);
    font-weight: 700;
}

.link-button {
    margin-top: 12px;
}

.topic-summary h2 {
    margin-bottom: 12px;
}

.topic-row {
    margin-bottom: 14px;
}

.topic-label-row {
    display: flex;
    justify-content: space-between;
    gap: 10px;
    margin-bottom: 6px;
    font-weight: 700;
}

.topic-status {
    margin-top: 6px;
    font-size: 0.9rem;
    font-weight: 700;
}

.status-pass {
    color: var(--success);
}

.status-fail {
    color: var(--error);
}

.overall-summary {
    text-align: center;
    margin-bottom: 20px;
    border-radius: 12px;
    padding: 18px;
    border: 1px solid var(--border);
}

.overall-summary.passed {
    background: var(--pass);
    color: var(--pass-text);
}

.overall-summary.failed {
    background: var(--fail);
    color: var(--fail-text);
}

.grade,
.grade-letter,
.elapsed,
.pass-status {
    margin: 6px 0;
    font-weight: 700;
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 22px;
    margin-top: 26px;
    width: 100%;
}

.feature-card {
    background: linear-gradient(135deg, rgba(15, 118, 110, 0.08), rgba(15, 118, 110, 0.14));
    border: 1px solid rgba(15, 118, 110, 0.16);
    border-radius: 18px;
    padding: 24px 20px;
    box-shadow: 0 12px 28px rgba(15, 118, 110, 0.06);
    text-align: left;
}

.feature-icon {
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 12px;
    background: linear-gradient(135deg, var(--primary) 0%, #0f9a9c 100%);
    color: #fff;
    font-size: 1.35rem;
    font-weight: 700;
    margin-bottom: 16px;
    box-shadow: 0 10px 20px rgba(15, 118, 110, 0.18);
}

.feature-icon svg {
    width: 24px;
    height: 24px;
    stroke: currentColor;
    fill: none;
    stroke-width: 2;
    stroke-linecap: round;
    stroke-linejoin: round;
}

.feature-card h3 {
    margin: 0 0 10px;
    font-size: 1.2rem;
}

.feature-card p {
    margin: 0;
    color: var(--muted);
}

body {
    background: transparent;
}

:root[data-theme="dark"] body {
    background: transparent;
}

:root[data-theme="dark"] .card,
:root[data-theme="dark"] .feature-card,
:root[data-theme="dark"] .question-block,
:root[data-theme="dark"] .question-card,
:root[data-theme="dark"] .result-item,
:root[data-theme="dark"] .topic-summary,
:root[data-theme="dark"] .home-card,
:root[data-theme="dark"] .choice-card,
:root[data-theme="dark"] .timer-box,
:root[data-theme="dark"] .overall-summary {
    background: rgba(17, 28, 45, 0.95);
    box-shadow: 0 18px 35px rgba(2, 6, 23, 0.35);
    color: var(--text);
}

:root[data-theme="dark"] .home-card {
    background: linear-gradient(135deg, rgba(17, 28, 45, 0.98), rgba(12, 31, 47, 0.98));
    border-color: rgba(110, 170, 220, 0.2);
    box-shadow: 0 20px 45px rgba(2, 6, 23, 0.35);
}

:root[data-theme="dark"] .home-hero h1,
:root[data-theme="dark"] .home-hero p,
:root[data-theme="dark"] .home-hero strong,
:root[data-theme="dark"] .feature-card h3,
:root[data-theme="dark"] .feature-card p,
:root[data-theme="dark"] .home-hero .eyebrow,
:root[data-theme="dark"] .feature-icon {
    color: var(--text);
}

:root[data-theme="dark"] .home-hero p,
:root[data-theme="dark"] .feature-card p,
:root[data-theme="dark"] .elapsed,
:root[data-theme="dark"] .topic-summary p,
:root[data-theme="dark"] .topic-summary li,
:root[data-theme="dark"] .topic-summary ul,
:root[data-theme="dark"] .topic-status,
:root[data-theme="dark"] .timer-box span {
    color: var(--muted);
}

:root[data-theme="dark"] .roadmap-panel {
    border-color: rgba(39, 199, 194, 0.22);
    background: rgba(39, 199, 194, 0.1);
}

:root[data-theme="dark"] .roadmap-panel h3 {
    background: rgba(39, 199, 194, 0.14);
    color: var(--primary);
}

:root[data-theme="dark"] .roadmap-list {
    color: var(--muted);
}

:root[data-theme="dark"] .home-card .secondary-btn,
:root[data-theme="dark"] .secondary-btn,
:root[data-theme="dark"] .link-button {
    background: rgba(255,255,255,0.04);
    color: var(--text);
    border-color: rgba(148, 163, 184, 0.22);
}

:root[data-theme="dark"] .home-card .primary-btn {
    background: linear-gradient(135deg, #12b6b0 0%, #0f9cac 100%);
    box-shadow: 0 16px 34px rgba(32, 183, 176, 0.26);
    border-color: rgba(74, 216, 209, 0.35);
    color: #ffffff;
}

:root[data-theme="dark"] .feature-card {
    background: linear-gradient(135deg, rgba(39, 199, 194, 0.12), rgba(29, 78, 216, 0.1));
    border-color: rgba(148, 163, 184, 0.18);
}

:root[data-theme="dark"] .feature-icon {
    background: linear-gradient(135deg, rgba(39, 199, 194, 0.16), rgba(29, 78, 216, 0.12));
    color: #d8f9ff;
}

:root[data-theme="dark"] input,
:root[data-theme="dark"] select,
:root[data-theme="dark"] textarea {
    background: rgba(15, 23, 34, 0.8);
    color: var(--text);
    border-color: rgba(148, 163, 184, 0.2);
}

:root[data-theme="dark"] select option {
    background: #111c2d;
    color: #edf5ff;
}

:root[data-theme="dark"] .site-footer {
    background: rgba(17, 28, 45, 0.8);
    color: var(--text);
}

:root[data-theme="dark"] .choice-card {
    background: linear-gradient(135deg, rgba(16, 28, 42, 0.96), rgba(13, 38, 58, 0.96));
    color: var(--text);
    border-color: rgba(148, 163, 184, 0.24);
}

:root[data-theme="dark"] .choice-card:hover {
    background: linear-gradient(135deg, rgba(22, 39, 57, 0.98), rgba(18, 50, 74, 0.98));
}

:root[data-theme="dark"] .timer-box {
    background: rgba(15, 23, 34, 0.8);
    border-color: rgba(148, 163, 184, 0.18);
    color: var(--text);
}

:root[data-theme="dark"] .timer-box strong {
    color: #d8f5ff;
}

:root[data-theme="dark"] .metar-report {
    background: rgba(39, 199, 194, 0.18);
    border-left-color: rgba(39, 199, 194, 0.7);
}

:root[data-theme="dark"] .status-pass,
:root[data-theme="dark"] .answer-correct,
:root[data-theme="dark"] .success {
    color: #8ee7b9;
}

:root[data-theme="dark"] .status-fail,
:root[data-theme="dark"] .answer-wrong,
:root[data-theme="dark"] .error {
    color: #ffb3bf;
}

:root[data-theme="dark"] .topic-summary a,
:root[data-theme="dark"] .card a,
:root[data-theme="dark"] .feature-card a {
    color: #9ad9ff;
}

@media (min-width: 769px) and (max-width: 1100px) {
    .feature-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

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

    .metar-result-row {
        grid-template-columns: minmax(120px, 1fr) minmax(100px, 1fr);
    }

    .metar-result-row small {
        grid-column: 1 / -1;
    }
}

@media (max-width: 768px) {
    .site-header {
        position: static;
    }

    .footer-inner {
        flex-direction: column;
        align-items: center;
        text-align: center;
    }

    .site-header .header-inner {
        flex-direction: column;
        align-items: stretch;
        gap: 14px;
        padding: 20px 0 24px;
    }

    .site-header .brand {
        align-self: center;
    }

    .site-header .brand img {
        width: 140px;
    }

    .nav-toggle {
        display: inline-flex;
        align-self: stretch;
        width: auto;
        margin: 0 18px;
        height: auto;
        padding: 13px 22px;
        border-radius: 12px;
        gap: 8px;
        font: inherit;
        font-size: 1rem;
        font-weight: 700;
    }

    .nav-toggle-label {
        display: inline-block;
    }

    .site-header .main-nav {
        display: none;
        width: 100%;
        flex-basis: 100%;
        margin-left: 0;
    }

    .site-header .main-nav.is-open {
        display: flex;
        flex-direction: column;
        align-items: stretch;
        justify-content: flex-start;
        gap: 4px;
        margin-top: 14px;
        padding-top: 14px;
        border-top: 1px solid rgba(255, 255, 255, 0.14);
    }

    .site-header .main-nav.is-open .nav-link {
        width: 100%;
        justify-content: flex-start;
    }

    .site-header .main-nav.is-open .language-picker,
    .site-header .main-nav.is-open .theme-toggle {
        margin: 6px auto 0;
    }

    .page-shell {
        padding-top: 24px;
    }

    .card,
    .home-card,
    .contact-card {
        padding: 22px 18px;
    }

    .feature-grid {
        grid-template-columns: 1fr;
    }

    .button-row {
        flex-direction: column;
        align-items: stretch;
    }

    .primary-btn,
    .secondary-btn,
    button,
    .link-button {
        width: 100%;
    }

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

    .metar-fields,
    .metar-result-row {
        grid-template-columns: 1fr;
    }

    .metar-question-heading {
        grid-template-columns: 1fr;
    }

    .metar-question-cell + .metar-question-cell {
        border-top: 1px solid var(--border);
        border-left: 0;
    }

    .metar-question-number {
        align-items: flex-start;
    }

    .metar-fields label {
        min-height: 0;
    }
}