:root {
    --bg-base: #f5f2ec;
    --text-primary: #1a1816;
    --text-secondary: rgba(26, 24, 22, 0.76);
    --text-muted: rgba(26, 24, 22, 0.52);
    --c-lehre: #0ab4c8;
    --c-lehre-light: #6ee0ec;
    --c-lehre-deep: #087f8e;
    --ok: #0e9a66;
    --fail: #d1223c;
    --warn: #b8872a;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    scroll-behavior: smooth;
}

body {
    font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    color: var(--text-primary);
    background: var(--bg-base);
    overflow-x: hidden;
    min-height: 100vh;
    line-height: 1.5;
}

#p5-background {
    position: fixed !important;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -10 !important;
    pointer-events: none !important;
    opacity: 0.95;
}

#readability-scrim {
    position: fixed;
    inset: 0;
    z-index: -9;
    pointer-events: none;
}

.nav-home {
    position: fixed;
    top: clamp(20px, 3.5vw, 40px);
    left: clamp(20px, 4.5vw, 60px);
    z-index: 102;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    text-decoration: none;
    color: var(--text-primary);
    font-size: 0;
    line-height: 1;
    padding: 6px;
    opacity: 0.85;
    transition: transform 0.3s ease, opacity 0.3s ease;
}

.nav-home:hover {
    opacity: 1;
    transform: translateX(-3px);
}

.nav-home::before {
    content: "←";
    font-size: 30px;
    font-weight: 300;
    line-height: 1;
}

.header {
    position: relative;
    z-index: 10;
    text-align: center;
    padding: clamp(48px, 8vw, 96px) 24px clamp(24px, 4vw, 40px);
}

.header-brand .title {
    font-family: "Inter Tight", sans-serif;
    font-size: clamp(28px, 4.5vw, 48px);
    font-weight: 500;
    letter-spacing: -0.02em;
    color: var(--text-primary);
}

.lang-btn {
    position: fixed;
    top: clamp(20px, 3.5vw, 40px);
    right: clamp(20px, 4.5vw, 60px);
    z-index: 102;
    background: transparent;
    border: 1px solid rgba(26, 24, 22, 0.25);
    border-radius: 4px;
    padding: 8px 14px;
    font-family: "Inter", sans-serif;
    font-size: 13px;
    font-weight: 500;
    letter-spacing: 0.08em;
    color: var(--text-primary);
    cursor: pointer;
}

.lang-btn:hover {
    border-color: var(--text-primary);
    background: rgba(26, 24, 22, 0.04);
}

.eoki-main {
    position: relative;
    z-index: 5;
    max-width: 840px;
    margin: 0 auto;
    padding: 0 24px clamp(64px, 10vw, 96px);
}

.eoki-intro {
    text-align: center;
    max-width: 720px;
    margin: 0 auto clamp(40px, 6vw, 64px);
}

.eoki-intro__role {
    font-family: "Inter Tight", sans-serif;
    font-size: clamp(12px, 1.3vw, 15px);
    font-weight: 500;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--text-muted);
    margin-bottom: 20px;
}

.eoki-intro__lead,
.eoki-intro__note {
    font-family: "Inter", sans-serif;
    font-size: clamp(17px, 1.6vw, 21px);
    font-weight: 300;
    line-height: 1.65;
    color: var(--text-secondary);
}

.eoki-intro__note {
    margin-top: 1.2em;
    font-size: clamp(15px, 1.4vw, 17px);
}

.eoki-section-title {
    font-family: "Inter Tight", sans-serif;
    font-size: clamp(14px, 1.4vw, 16px);
    font-weight: 600;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--text-muted);
    text-align: center;
    margin-bottom: 20px;
}

.eoki-coverage {
    margin-bottom: clamp(48px, 8vw, 72px);
}

.eoki-coverage__grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
    gap: 10px;
}

.eoki-unit {
    appearance: none;
    font: inherit;
    text-align: left;
    cursor: pointer;
    background: rgba(245, 242, 236, 0.78);
    border: 1px solid rgba(26, 24, 22, 0.12);
    border-radius: 8px;
    padding: 14px 14px 12px;
    color: var(--text-primary);
    transition: border-color 0.2s ease, transform 0.2s ease;
}

.eoki-unit:hover,
.eoki-unit.is-active {
    border-color: var(--c-lehre-deep);
}

.eoki-unit__id {
    font-family: "IBM Plex Mono", monospace;
    font-size: 12px;
    letter-spacing: 0.06em;
    color: var(--c-lehre-deep);
}

.eoki-unit__title {
    display: block;
    margin: 6px 0 8px;
    font-size: 14px;
    font-weight: 500;
    line-height: 1.35;
}

.eoki-unit__count {
    font-size: 12px;
    color: var(--text-muted);
}

.eoki-unit.is-empty .eoki-unit__count {
    color: var(--warn);
}

.eoki-filters {
    display: grid;
    gap: 18px;
    margin-bottom: 20px;
}

.eoki-filter__label {
    font-size: 12px;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--text-muted);
    margin-bottom: 8px;
}

.eoki-chips {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.eoki-chip {
    appearance: none;
    font: inherit;
    cursor: pointer;
    background: transparent;
    border: 1px solid rgba(26, 24, 22, 0.2);
    border-radius: 999px;
    padding: 6px 12px;
    font-size: 13px;
    color: var(--text-primary);
}

.eoki-chip.is-active {
    border-color: var(--c-lehre-deep);
    background: rgba(10, 180, 200, 0.12);
}

.eoki-progress {
    text-align: center;
    font-size: 14px;
    color: var(--text-muted);
    margin-bottom: 16px;
    min-height: 1.4em;
}

.eoki-card {
    background: rgba(245, 242, 236, 0.86);
    border: 1px solid rgba(26, 24, 22, 0.12);
    border-radius: 10px;
    padding: clamp(20px, 3vw, 32px);
}

.eoki-card__status,
.eoki-empty {
    color: var(--text-secondary);
    font-weight: 300;
    line-height: 1.6;
}

.eoki-empty__todo {
    margin-top: 12px;
    font-size: 14px;
    color: var(--text-muted);
}

.eoki-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 8px 12px;
    margin-bottom: 18px;
    font-family: "IBM Plex Mono", monospace;
    font-size: 12px;
    letter-spacing: 0.04em;
    color: var(--text-muted);
}

.eoki-context {
    white-space: pre-wrap;
    font-size: 15px;
    line-height: 1.65;
    color: var(--text-secondary);
    margin-bottom: 16px;
    padding: 12px 14px;
    background: rgba(26, 24, 22, 0.04);
    border-radius: 6px;
}

.eoki-stem {
    font-size: clamp(17px, 1.6vw, 20px);
    font-weight: 400;
    line-height: 1.55;
    white-space: pre-wrap;
    margin-bottom: 20px;
}

.eoki-options {
    display: grid;
    gap: 8px;
}

.eoki-option {
    appearance: none;
    font: inherit;
    text-align: left;
    cursor: pointer;
    background: rgba(255, 255, 255, 0.45);
    border: 1px solid rgba(26, 24, 22, 0.14);
    border-radius: 8px;
    padding: 12px 14px;
    color: var(--text-primary);
}

.eoki-option.is-selected {
    border-color: var(--c-lehre-deep);
    background: rgba(10, 180, 200, 0.1);
}

.eoki-option.is-correct {
    border-color: var(--ok);
    background: rgba(14, 154, 102, 0.12);
}

.eoki-option.is-wrong {
    border-color: var(--fail);
    background: rgba(209, 34, 60, 0.08);
}

.eoki-option__key {
    font-family: "IBM Plex Mono", monospace;
    font-size: 12px;
    margin-right: 8px;
    color: var(--text-muted);
}

.eoki-assign,
.eoki-order {
    display: grid;
    gap: 10px;
}

.eoki-assign__row,
.eoki-order__row {
    display: grid;
    grid-template-columns: 1fr minmax(140px, 1.2fr);
    gap: 10px;
    align-items: center;
}

.eoki-order__row {
    grid-template-columns: auto 1fr auto;
}

.eoki-assign__left,
.eoki-order__text {
    font-size: 15px;
}

.eoki-assign select {
    font: inherit;
    padding: 8px 10px;
    border-radius: 6px;
    border: 1px solid rgba(26, 24, 22, 0.2);
    background: rgba(255, 255, 255, 0.7);
}

.eoki-order__move {
    appearance: none;
    font: inherit;
    cursor: pointer;
    border: 1px solid rgba(26, 24, 22, 0.2);
    background: transparent;
    border-radius: 6px;
    padding: 4px 8px;
}

.eoki-open textarea {
    width: 100%;
    min-height: 140px;
    font: inherit;
    padding: 12px;
    border-radius: 8px;
    border: 1px solid rgba(26, 24, 22, 0.18);
    background: rgba(255, 255, 255, 0.65);
    resize: vertical;
}

.eoki-feedback {
    margin-top: 18px;
    padding-top: 16px;
    border-top: 1px solid rgba(26, 24, 22, 0.1);
}

.eoki-ampel {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-size: 13px;
    font-weight: 600;
    letter-spacing: 0.04em;
    text-transform: uppercase;
    margin-bottom: 10px;
}

.eoki-ampel::before {
    content: "";
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: currentColor;
}

.eoki-ampel.is-ok { color: var(--ok); }
.eoki-ampel.is-fail { color: var(--fail); }
.eoki-ampel.is-partial { color: var(--warn); }
.eoki-ampel.is-open { color: var(--c-lehre-deep); }

.eoki-explain,
.eoki-rubric {
    font-size: 15px;
    font-weight: 300;
    line-height: 1.6;
    color: var(--text-secondary);
}

.eoki-rubric ul {
    margin: 8px 0 0 1.1em;
}

.eoki-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    justify-content: center;
    margin-top: 20px;
}

.eoki-btn {
    appearance: none;
    font: inherit;
    cursor: pointer;
    border-radius: 6px;
    padding: 10px 16px;
    border: 1px solid rgba(26, 24, 22, 0.7);
    background: rgba(26, 24, 22, 0.88);
    color: #f5f2ec;
}

.eoki-btn--ghost {
    background: transparent;
    color: var(--text-primary);
    border-color: rgba(26, 24, 22, 0.25);
}

.eoki-btn:disabled {
    opacity: 0.4;
    cursor: default;
}

@media (max-width: 640px) {
    .eoki-assign__row {
        grid-template-columns: 1fr;
    }

    .nav-home {
        left: 12px;
    }

    .lang-btn {
        right: 12px;
    }
}