:root {
    --ink: #171326;
    --ink-soft: #4d465f;
    --paper: #fbfaff;
    --panel: #ffffff;
    --panel-tint: #f1effb;
    --line: #d9d3ee;
    --purple-950: #160d32;
    --purple-900: #24114d;
    --purple-800: #342065;
    --purple-700: #4b2c99;
    --purple-600: #5f3bc4;
    --purple-500: #7654e8;
    --purple-300: #b8a8f6;
    --violet-glow: #9f7cff;
    --blue: #4f7df3;
    --green: #1f8f69;
    --amber: #b76b10;
    --red: #c44757;
    --shadow-sm: 0 10px 26px rgba(29, 17, 60, .08);
    --shadow-md: 0 24px 54px rgba(29, 17, 60, .15);
    --radius: 18px;
    --radius-sm: 12px;
}

html {
    color-scheme: light;
    scroll-behavior: smooth;
}

body {
    font-family: Inter, ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif !important;
    color: var(--ink);
    background:
        radial-gradient(circle at 12% -8%, rgba(118, 84, 232, .18), transparent 32rem),
        linear-gradient(180deg, #f7f5fd 0%, #eeebf8 100%) !important;
    min-height: 100vh;
    padding: 22px !important;
}

body::before {
    content: "";
    position: fixed;
    inset: 0;
    z-index: -1;
    opacity: .35;
    pointer-events: none;
    background-image:
        linear-gradient(rgba(63, 36, 126, .035) 1px, transparent 1px),
        linear-gradient(90deg, rgba(63, 36, 126, .035) 1px, transparent 1px);
    background-size: 36px 36px;
}

button, a, .mcq-choice, .level-btn { -webkit-tap-highlight-color: transparent; }
button:focus-visible, a:focus-visible, .mcq-choice:focus-visible, .level-btn:focus-visible {
    outline: 3px solid rgba(79, 125, 243, .45);
    outline-offset: 3px;
}

.container { max-width: 1120px !important; }

.card {
    background: rgba(255,255,255,.95) !important;
    border: 1px solid rgba(63, 36, 126, .12);
    border-radius: var(--radius) !important;
    padding: clamp(22px, 4vw, 40px) !important;
    margin-bottom: 22px !important;
    box-shadow: var(--shadow-sm) !important;
}

.header {
    min-height: 330px;
    display: grid;
    grid-template-columns: 112px 1fr;
    align-items: start;
    gap: 34px;
    overflow: hidden;
    text-align: left !important;
    color: white;
    padding: clamp(32px, 6vw, 70px) !important;
    border-radius: 26px !important;
    border: 1px solid rgba(255,255,255,.16);
    background:
        radial-gradient(circle at 82% 8%, rgba(159, 124, 255, .4), transparent 22rem),
        linear-gradient(135deg, var(--purple-950), var(--purple-800) 57%, #4b2ba3) !important;
    box-shadow: var(--shadow-md);
    margin-bottom: 28px !important;
}

.header::before, .header::after {
    content: "";
    position: absolute;
    border: 1px solid rgba(255,255,255,.10);
    border-radius: 50%;
    pointer-events: none;
}
.header::before { width: 340px; height: 340px; right: -150px; bottom: -220px; }
.header::after { width: 210px; height: 210px; right: -72px; bottom: -140px; }

.home-btn {
    top: 20px !important;
    left: 20px !important;
    /* iOS standalone PWA: clear the status bar / notch / Dynamic Island.
       Resolves to the base offset everywhere else. */
    top: calc(20px + env(safe-area-inset-top)) !important;
    left: calc(20px + env(safe-area-inset-left)) !important;
    min-height: 40px;
    padding: 8px 14px !important;
    border: 1px solid rgba(255,255,255,.42) !important;
    border-radius: 10px !important;
    background: rgba(255,255,255,.08) !important;
    backdrop-filter: blur(10px);
}
.home-btn:hover { color: white !important; background: rgba(255,255,255,.17) !important; }

.header-logo {
    width: 104px !important;
    height: 104px !important;
    margin: 4px 0 0 !important;
    border-radius: 24px !important;
    border: 1px solid rgba(255,255,255,.28) !important;
    background: linear-gradient(145deg, rgba(255,255,255,.16), rgba(255,255,255,.04)) !important;
    box-shadow: 0 18px 36px rgba(0,0,0,.22) !important;
}
.header-logo svg { display: none !important; }
.header-logo::before { content: ""; width: 82%; height: 82%; background: url("icon.svg") center/contain no-repeat; filter: drop-shadow(0 6px 10px rgba(0,0,0,.2)); }

.brand-overline, .section-kicker, .card-label {
    margin: 0 0 12px !important;
    color: var(--purple-600) !important;
    font-size: 12px !important;
    line-height: 1.25 !important;
    font-weight: 800 !important;
    letter-spacing: .14em;
    text-transform: uppercase;
}
.header .brand-overline { color: #c9bcff !important; }
.header h1 {
    margin: 0 !important;
    font-size: clamp(46px, 8vw, 82px) !important;
    line-height: .96;
    letter-spacing: -.055em;
}
.header-kicker {
    margin: 12px 0 26px !important;
    font-size: clamp(18px, 2.6vw, 27px) !important;
    color: #dcd4ff !important;
    opacity: 1 !important;
}
.header-facts { display: flex; flex-wrap: wrap; gap: 10px; }
.header-facts span {
    display: inline-flex;
    align-items: baseline;
    gap: 6px;
    padding: 9px 12px;
    border: 1px solid rgba(255,255,255,.18);
    border-radius: 10px;
    color: rgba(255,255,255,.8);
    font-size: 12px;
}
.header-facts strong { color: #fff; font-size: 16px; }
.header-credit { margin-top: 18px !important; color: rgba(255,255,255,.64) !important; opacity: 1 !important; }
body[data-screen="homeScreen"] .home-btn { display: none; }
body:not([data-screen="homeScreen"]) .header {
    min-height: 0;
    grid-template-columns: 64px 1fr;
    gap: 20px;
    padding: 26px 30px 26px 96px !important;
    padding-top: calc(26px + env(safe-area-inset-top)) !important;
}
body:not([data-screen="homeScreen"]) .header-logo { width: 64px !important; height: 64px !important; border-radius: 16px !important; }
body:not([data-screen="homeScreen"]) .header h1 { font-size: 34px !important; letter-spacing: -.04em; }
body:not([data-screen="homeScreen"]) .brand-overline { margin-bottom: 4px !important; font-size: 10px !important; }
body:not([data-screen="homeScreen"]) .header-kicker { margin: 5px 0 0 !important; font-size: 14px !important; }
body:not([data-screen="homeScreen"]) .header-facts,
body:not([data-screen="homeScreen"]) .header-credit { display: none; }

.course-intro {
    display: grid;
    grid-template-columns: minmax(0, 1.4fr) minmax(250px, .6fr);
    gap: 34px;
    align-items: end;
}
.course-intro h2 {
    margin: 0;
    font-size: clamp(34px, 5vw, 58px);
    line-height: 1.02;
    letter-spacing: -.045em;
}
.course-intro h2 span { color: var(--purple-600); }
.course-intro-copy { max-width: 700px; margin: 22px 0 0; color: var(--ink-soft); font-size: 17px; line-height: 1.7; }
.course-intro-actions { display: grid; gap: 10px; }
.course-trust-row { grid-column: 1 / -1; display: grid; grid-template-columns: repeat(3, 1fr); border-top: 1px solid var(--line); padding-top: 24px; }
.course-trust-row span { padding: 0 20px; color: var(--ink-soft); font-size: 12px; }
.course-trust-row span:first-child { padding-left: 0; }
.course-trust-row span + span { border-left: 1px solid var(--line); }
.course-trust-row strong { display: block; margin-bottom: 5px; color: var(--ink); font-size: 14px; }

.btn, .daily-challenge-button, .mastery-quiz-button, .download-cert-button {
    min-height: 50px;
    border-radius: var(--radius-sm) !important;
    font-size: 15px !important;
    font-weight: 750 !important;
    letter-spacing: -.01em;
    transition: transform .18s ease, box-shadow .18s ease, border-color .18s ease, background .18s ease !important;
}
.btn:hover, .daily-challenge-button:hover, .mastery-quiz-button:hover:not(:disabled), .download-cert-button:hover { transform: translateY(-2px); }
.btn-primary {
    color: #fff !important;
    background: linear-gradient(135deg, var(--purple-700), var(--purple-500)) !important;
    box-shadow: 0 12px 24px rgba(75,44,153,.24);
}
.btn-secondary {
    color: var(--purple-800) !important;
    border: 1px solid var(--purple-300) !important;
    background: #fff !important;
}
.btn-secondary:hover { background: var(--panel-tint) !important; }

.dashboard-actions { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; margin-bottom: 22px; }
.action-tile {
    display: grid;
    grid-template-columns: auto 1fr;
    gap: 3px 14px;
    text-align: left;
    padding: 20px;
    color: var(--ink);
    background: #fff;
    border: 1px solid var(--line);
    border-radius: 15px;
    box-shadow: var(--shadow-sm);
    cursor: pointer;
}
.action-tile:hover { border-color: var(--purple-500); transform: translateY(-2px); }
.action-number { grid-row: 1 / span 2; color: var(--purple-500); font: 800 12px/1 ui-monospace, SFMono-Regular, monospace; }
.action-tile strong { font-size: 15px; }
.action-tile small { color: var(--ink-soft); }
.action-tile-quiet { background: rgba(255,255,255,.58); }

.section-heading-row, .reference-card { display: flex; align-items: center; justify-content: space-between; gap: 26px; }
.section-heading-row h3, .reference-card h3 { margin: 0; font-size: clamp(24px, 3vw, 34px); letter-spacing: -.035em; }
.text-button { border: 0; background: transparent; color: var(--purple-600); font-weight: 800; cursor: pointer; }
.learning-path { list-style: none; display: grid; grid-template-columns: repeat(5, 1fr); gap: 0; margin: 32px 0 0; padding: 0; counter-reset: path; }
.learning-path li { position: relative; min-width: 0; padding: 18px 16px 4px 0; border-top: 2px solid var(--line); }
.learning-path li::before { content: ""; position: absolute; top: -6px; left: 0; width: 10px; height: 10px; border: 2px solid #fff; border-radius: 50%; background: var(--purple-500); box-shadow: 0 0 0 2px var(--purple-300); }
.learning-path li span { display: block; margin-bottom: 15px; color: var(--purple-500); font: 800 11px/1 ui-monospace, SFMono-Regular, monospace; }
.learning-path strong, .learning-path small { display: block; }
.learning-path strong { margin-bottom: 6px; }
.learning-path small { color: var(--ink-soft); line-height: 1.45; }

.challenge-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 22px; margin-bottom: 22px; }
.daily-challenge-card, .mastery-quiz-card {
    position: relative;
    min-height: 330px;
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    margin: 0 !important;
    padding: clamp(26px, 4vw, 38px) !important;
    overflow: hidden;
    border-radius: var(--radius) !important;
    box-shadow: var(--shadow-sm) !important;
}
.daily-challenge-card {
    color: #fff;
    border: 1px solid rgba(255,255,255,.18) !important;
    background: linear-gradient(145deg, var(--purple-950), var(--purple-700)) !important;
}
.mastery-quiz-card {
    color: var(--ink);
    border: 1px solid var(--purple-300) !important;
    background: linear-gradient(145deg, #fff, #ece8ff) !important;
}
.daily-challenge-card::after, .mastery-quiz-card::after { content: ""; position: absolute; width: 210px; height: 210px; right: -110px; top: -110px; border: 1px solid currentColor; border-radius: 50%; opacity: .12; }
.daily-challenge-card .card-label { color: #bfaeff !important; }
.daily-challenge-card h2, .mastery-quiz-card h2 { margin: 0 0 15px !important; font-size: clamp(28px, 4vw, 40px) !important; line-height: 1.05; }
.mastery-quiz-card h2 { color: var(--ink) !important; }
.daily-challenge-card p { color: rgba(255,255,255,.76) !important; }
.mastery-quiz-card p { color: var(--ink-soft) !important; }
.daily-challenge-button, .mastery-quiz-button { margin-top: auto; padding: 13px 18px !important; }
.daily-challenge-button { color: var(--purple-900) !important; background: #fff !important; }
.mastery-quiz-button { color: #fff !important; background: linear-gradient(135deg, var(--purple-700), var(--purple-500)) !important; }
.mastery-quiz-button:disabled { color: #6e6680 !important; background: #ddd8e9 !important; opacity: 1 !important; }
.mastery-quiz-button .lock-icon { position: static !important; transform: none !important; margin-right: 6px; font-size: 16px; }
.mastery-quiz-requirements { width: 100%; display: grid; gap: 5px; color: var(--ink-soft) !important; background: rgba(255,255,255,.7) !important; border: 1px solid var(--line); border-radius: 10px !important; }
.mastery-quiz-requirements strong { color: var(--purple-700); }

.reference-card p { max-width: 720px; margin: 10px 0 0; color: var(--ink-soft); line-height: 1.65; }
.founding-card {
    color: #fff;
    border: 0 !important;
    background: linear-gradient(135deg, var(--purple-800), #4b2ba3) !important;
}
.founding-card::before { background: radial-gradient(circle, rgba(255,255,255,.13), transparent 65%) !important; }
.founding-badge { border-radius: 8px !important; }
.founding-title { font-size: clamp(25px, 3vw, 34px) !important; }
.founding-text { max-width: 760px; font-size: 16px !important; }

.privacy-card { display: grid; grid-template-columns: 76px 1fr; gap: 24px; align-items: center; }
.privacy-mark { width: 76px; height: 76px; display: grid; place-items: center; border-radius: 18px; color: var(--purple-700); background: var(--panel-tint); border: 1px solid var(--purple-300); font: 850 11px/1 ui-monospace, SFMono-Regular, monospace; letter-spacing: .08em; }
.privacy-card h3 { margin: 0 0 7px; font-size: 21px; }
.privacy-card p { margin: 0; color: var(--ink-soft); line-height: 1.6; }

.portfolio-card {
    color: var(--ink) !important;
    background: #fff !important;
    border: 1px solid var(--line) !important;
    border-radius: var(--radius) !important;
    box-shadow: var(--shadow-sm) !important;
}
.portfolio-card::before { display: none; }
.portfolio-card-content { text-align: left !important; }
.portfolio-card h3 { color: var(--ink) !important; text-shadow: none !important; font-size: 26px !important; }
.portfolio-card p { color: var(--ink-soft) !important; font-weight: 600 !important; }
.portfolio-card-button { color: var(--purple-700) !important; background: var(--panel-tint) !important; border-radius: 10px !important; box-shadow: none !important; }
.education-disclaimer { margin: 28px auto 10px; max-width: 760px; color: #675f78; font-size: 12px; line-height: 1.6; text-align: center; }

/* Internal learning screens */
#compendiumScreen h2, #placementScreen h2, #levelSelectScreen h2, #progressScreen h2,
#startCaseScreen h2, #caseScreen h2, #levelCompleteScreen h2, #knowledgeArticleScreen h2,
#masteryQuizScreen h2, #masteryCompletionScreen h2 { color: var(--ink) !important; letter-spacing: -.03em; }
.level-btn { border: 1px solid var(--line) !important; border-radius: 14px !important; box-shadow: none; }
.level-btn:hover { border-color: var(--purple-500) !important; transform: translateY(-2px) !important; }
.level-btn.unlocked { border-color: var(--purple-300) !important; background: #fff !important; }
.level-btn.locked { background: #efedf3 !important; }
.progress-bar { height: 13px !important; background: #e3dfed !important; border-radius: 20px !important; }
.progress-fill { background: linear-gradient(90deg, var(--purple-700), var(--purple-500)) !important; }
.stats { gap: 10px !important; }
.stat-item { background: var(--panel-tint) !important; border: 1px solid var(--line); border-radius: 12px !important; }
.scenario-box, .abg-values, .equation-box, .question-box, .compendium-box, .knowledge-article {
    border-radius: 14px !important;
    border: 1px solid var(--line) !important;
    box-shadow: none !important;
}
.scenario-box { background: #f3f6ff !important; border-left: 4px solid var(--blue) !important; }
.abg-values { background: #faf7ff !important; border-left: 4px solid var(--purple-500) !important; }
.abg-item { border: 1px solid var(--line); border-radius: 10px !important; }
.equation-box { background: #f7f5fd !important; border-left: 4px solid var(--purple-500) !important; }
.equation-box h4, .knowledge-article h2 { color: var(--purple-700) !important; }
.question-box { background: #f9f8fc !important; }
.mcq-choice { border: 1px solid var(--line) !important; border-radius: 12px !important; }
.mcq-choice:hover, .mcq-choice.selected { border-color: var(--purple-500) !important; background: #f2eeff !important; }
.mcq-choice.correct { border-color: #68ad95 !important; background: #edf8f4 !important; }
.mcq-choice.incorrect { border-color: #d88b96 !important; background: #fff1f3 !important; }
#placementQuestionContainer > div:first-child { background: linear-gradient(135deg, var(--purple-800), var(--purple-500)) !important; }
#placementQuestionContainer > div:nth-child(2) { border-left-color: var(--purple-500) !important; }
#placementQuestionContainer .choice-btn { border: 1px solid var(--line) !important; border-radius: 12px !important; box-shadow: none !important; }
#placementQuestionContainer .choice-btn:hover { border-color: var(--purple-500) !important; transform: translateY(-2px) !important; }
#placementQuestionContainer .choice-btn > span:first-child { background: var(--purple-500) !important; border-radius: 10px !important; }
.knowledge-article { max-height: none !important; padding: clamp(18px, 4vw, 34px) !important; }
.level-intro-container { background: transparent !important; }
.btn-learn, .btn-start-cases { border-radius: 12px !important; }

/* Calculator and install surfaces */
.calculator-fab {
    right: 24px !important;
    bottom: calc(24px + env(safe-area-inset-bottom)) !important;
    width: 54px !important;
    height: 54px !important;
    border: 1px solid rgba(255,255,255,.7);
    border-radius: 16px !important;
    background: linear-gradient(145deg, var(--purple-700), var(--purple-500)) !important;
    box-shadow: 0 14px 28px rgba(54,32,101,.28) !important;
    color: #fff !important;
    font: 800 24px/1 Georgia, serif !important;
}
.calculator-overlay { padding: max(20px, env(safe-area-inset-top)) 20px max(20px, env(safe-area-inset-bottom)) !important; background: rgba(18, 10, 42, .72) !important; backdrop-filter: blur(8px); }
.calculator-container { border: 1px solid var(--purple-300); border-radius: 18px !important; }
.calculator-header h3 { color: var(--purple-700) !important; }
.calculator-close { display: grid; place-items: center; width: 40px !important; height: 40px !important; color: var(--purple-700) !important; border: 1px solid var(--line) !important; border-radius: 10px !important; }
.calculator-display { color: var(--ink) !important; background: var(--panel-tint) !important; }
.calc-btn { border-radius: 10px !important; }
.calc-btn.operator { background: var(--purple-700) !important; }
.calc-btn.equals { background: var(--green) !important; }

#installBanner { inset: auto 18px calc(18px + env(safe-area-inset-bottom)) 18px !important; max-width: 760px; margin: 0 auto; border: 1px solid rgba(255,255,255,.2); border-radius: 16px; background: linear-gradient(135deg, var(--purple-900), var(--purple-600)) !important; box-shadow: 0 20px 50px rgba(18,10,42,.34) !important; }

@media (max-width: 780px) {
    body { padding: 10px !important; }
    .header { min-height: 0; grid-template-columns: 74px 1fr; gap: 18px; padding: 68px 20px 28px !important; border-radius: 20px !important; }
    .header-logo { width: 72px !important; height: 72px !important; border-radius: 18px !important; }
    .header h1 { font-size: clamp(38px, 12vw, 58px) !important; }
    .header-kicker { margin-bottom: 16px !important; font-size: 18px !important; }
    .header-facts { grid-column: 1 / -1; }
    .header-facts span { flex: 1 1 calc(33.333% - 7px); justify-content: center; padding: 8px 6px; text-align: center; }
    .header-credit { grid-column: 1 / -1; }
    .course-intro, .challenge-grid { grid-template-columns: 1fr; }
    /* Reserve room for the fixed calculator FAB (54px + offsets) so the
       headline's last line can never render underneath it once the card
       goes full-width, regardless of scroll position. */
    .course-intro h2 { padding-right: 78px; }
    .course-trust-row { grid-template-columns: 1fr; gap: 14px; }
    .course-trust-row span { padding: 0 !important; }
    .course-trust-row span + span { border-left: 0; }
    .dashboard-actions { grid-template-columns: 1fr; }
    .learning-path { grid-template-columns: 1fr; }
    .learning-path li { display: grid; grid-template-columns: 42px 1fr; gap: 12px; border-top: 0; border-left: 2px solid var(--line); padding: 0 0 22px 20px; }
    .learning-path li::before { top: 2px; left: -6px; }
    .learning-path li span { margin: 3px 0 0; }
    .section-heading-row, .reference-card { align-items: flex-start; flex-direction: column; }
    .privacy-card { grid-template-columns: 1fr; }
    .privacy-mark { width: auto; height: 42px; border-radius: 10px; }
    .stats { grid-template-columns: 1fr 1fr !important; }
    .calculator-fab { right: 16px !important; bottom: calc(92px + env(safe-area-inset-bottom)) !important; }
    .calculator-container { max-height: calc(100dvh - 40px); overflow: auto; }
    #installBanner { flex-direction: column; align-items: stretch !important; gap: 12px; padding: 16px !important; }
    #installBanner > div:last-child { margin-left: 0 !important; }
    body:not([data-screen="homeScreen"]) .header {
        grid-template-columns: 52px 1fr;
        gap: 12px;
        padding: 62px 16px 18px !important;
        padding-top: calc(62px + env(safe-area-inset-top)) !important;
    }
    body:not([data-screen="homeScreen"]) .header-logo { width: 52px !important; height: 52px !important; border-radius: 13px !important; }
    body:not([data-screen="homeScreen"]) .header h1 { font-size: 29px !important; }
    body:not([data-screen="homeScreen"]) .header-kicker { font-size: 12px !important; }
}

@media (max-width: 460px) {
    .header { grid-template-columns: 60px 1fr; gap: 14px; padding-inline: 16px !important; }
    .header-logo { width: 60px !important; height: 60px !important; }
    .brand-overline { font-size: 10px !important; }
    .header h1 { font-size: 40px !important; }
    .header-facts span { flex-basis: 100%; justify-content: flex-start; }
    .card { padding: 22px 18px !important; border-radius: 15px !important; }
    .course-intro h2 { font-size: 35px; }
    .daily-challenge-card, .mastery-quiz-card { min-height: 310px; }
    .stats { grid-template-columns: 1fr !important; }
    .abg-grid { grid-template-columns: repeat(2, minmax(0, 1fr)) !important; }
}

@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after { scroll-behavior: auto !important; animation: none !important; transition-duration: .01ms !important; }
}