/* IT-Hummel-Branding (ithummel.com): Navy, Brand-Blau, Orange-Akzent */
:root {
    --brand-blue: oklch(51% 0.17 252);
    --brand-blue-light: oklch(62% 0.15 252);
    --brand-orange: oklch(62% 0.16 52);
    --brand-orange-dark: oklch(55% 0.14 50);
    --gradient-brand: linear-gradient(135deg, var(--brand-blue) 0%, var(--brand-orange) 100%);

    --primary: var(--brand-blue);
    --primary-dark: oklch(45% 0.17 252);
    --primary-grad: linear-gradient(135deg, oklch(55% 0.17 252) 0%, oklch(48% 0.17 252) 100%);
    --bg: oklch(98.5% 0.004 250);
    --bg-grad: linear-gradient(135deg, oklch(99.5% 0.002 250) 0%, oklch(97.5% 0.012 250) 70%, oklch(95.5% 0.025 245) 100%);
    --card-bg: oklch(100% 0 0);
    --text: oklch(24% 0.035 255);
    --muted: oklch(44% 0.025 255);
    --border: oklch(90% 0.012 250);
    --input-bg: oklch(100% 0 0);
    --secondary-bg: oklch(94.5% 0.012 250);
    --secondary-hover: oklch(91% 0.015 250);
    --thead-bg: oklch(97% 0.006 250);
    --success: #16a34a;
    --success-bg: #dcfce7;
    --success-grad: linear-gradient(90deg, var(--brand-blue) 0%, var(--brand-orange) 100%);
    --danger: oklch(52% 0.2 27);
    --danger-bg: oklch(94% 0.04 27);
    --danger-hover: oklch(89% 0.07 27);
    --warn-bg: oklch(96% 0.06 90);
    --warn-text: oklch(50% 0.12 70);
    --header-bg: oklch(16% 0.025 250);
    --header-border: oklch(28% 0.04 252);
    --shadow-sm: 0 1px 2px oklch(30% 0.04 255 / 0.08);
    --shadow-md: 0 8px 30px -14px oklch(30% 0.04 255 / 0.25);
    --shadow-lg: 0 12px 40px -10px oklch(30% 0.04 255 / 0.3);
    --shadow-glow-blue: 0 10px 40px -10px var(--brand-blue);
    --shadow-glow-orange: 0 10px 40px -10px var(--brand-orange);
    --focus-ring: 0 0 0 3px oklch(51% 0.17 252 / 0.25);
    --radius: 0.625rem;
    --radius-sm: 0.5rem;
    --transition-smooth: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

[data-theme="dark"] {
    --primary: oklch(62% 0.15 252);
    --primary-dark: oklch(55% 0.16 252);
    --primary-grad: linear-gradient(135deg, oklch(58% 0.16 252) 0%, oklch(50% 0.17 252) 100%);
    --bg: oklch(16% 0.025 250);
    --bg-grad: radial-gradient(1200px 600px at 80% -10%, oklch(51% 0.17 252 / 0.10), transparent),
               radial-gradient(900px 500px at -10% 25%, oklch(62% 0.16 52 / 0.06), transparent);
    --card-bg: oklch(21% 0.028 250);
    --text: oklch(97% 0.01 250);
    --muted: oklch(74% 0.02 250);
    --border: oklch(30% 0.035 250);
    --input-bg: oklch(17% 0.025 250);
    --secondary-bg: oklch(28% 0.032 250);
    --secondary-hover: oklch(33% 0.035 250);
    --thead-bg: oklch(24% 0.03 250);
    --success: #4ade80;
    --success-bg: #14532d;
    --danger: oklch(68% 0.18 27);
    --danger-bg: oklch(28% 0.09 27);
    --danger-hover: oklch(35% 0.11 27);
    --warn-bg: oklch(28% 0.06 70);
    --warn-text: oklch(78% 0.14 80);
    --header-bg: oklch(13% 0.022 250);
    --header-border: oklch(30% 0.05 252);
    --shadow-sm: 0 1px 2px oklch(0% 0 0 / 0.4);
    --shadow-md: 0 8px 30px -14px oklch(0% 0 0 / 0.55);
    --shadow-lg: 0 12px 40px -10px oklch(0% 0 0 / 0.6);
    --focus-ring: 0 0 0 3px oklch(62% 0.15 252 / 0.35);
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
    margin: 0;
    font-family: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    background: var(--bg);
    background-image: var(--bg-grad);
    background-attachment: fixed;
    color: var(--text);
    line-height: 1.55;
    transition: background 0.25s, color 0.25s;
    -webkit-font-smoothing: antialiased;
}

::selection { background: var(--brand-orange); color: oklch(15% 0.02 250); }

/* Header im ithummel.com-Stil: dunkles Navy in beiden Themes */
header {
    position: sticky;
    top: 0;
    z-index: 50;
    background: var(--header-bg);
    color: oklch(97% 0.01 250);
    padding: 0.8rem 1.5rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 0.5rem;
    border-bottom: 1px solid var(--header-border);
    box-shadow: var(--shadow-md);
}

header h1 {
    margin: 0;
    font-size: 1.2rem;
    font-weight: 800;
    letter-spacing: -0.01em;
    display: flex;
    align-items: center;
    gap: 0.6rem;
}

.brand-logo {
    height: 2.2rem;
    width: 2.2rem;
    object-fit: contain;
    transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}
header h1:hover .brand-logo { transform: scale(1.08); }

header h1 [data-i18n] {
    background: var(--gradient-brand);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
}

.brand-sub {
    font-size: 0.62rem;
    font-weight: 600;
    letter-spacing: 0.18em;
    text-transform: uppercase;
    color: oklch(74% 0.02 250);
}

.header-controls { display: flex; align-items: center; gap: 0.5rem; flex-wrap: wrap; }
#user-info { display: flex; align-items: center; gap: 0.8rem; }

.btn-ghost {
    background: oklch(100% 0 0 / 0.08);
    color: oklch(97% 0.01 250);
    backdrop-filter: blur(6px);
    border: 1px solid oklch(100% 0 0 / 0.18);
}
.btn-ghost:hover { background: oklch(100% 0 0 / 0.18); border-color: var(--brand-orange); }

main { max-width: 920px; margin: 1.8rem auto; padding: 0 1rem; }

.hidden { display: none !important; }

.view { animation: fadeIn 0.3s ease both; }

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(8px); }
    to { opacity: 1; transform: none; }
}

.card {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1.4rem;
    margin-bottom: 1.2rem;
    box-shadow: var(--shadow-sm);
    transition: box-shadow 0.2s, border-color 0.2s;
}

.section-head {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 1rem;
    flex-wrap: wrap;
}
.section-head h2, .section-head h3 { margin: 0; }
.section-head .btn { margin-left: auto; }
.section-head .btn-small { margin-left: 0; }

/* ---------- Buttons ---------- */
.btn {
    border: none;
    border-radius: var(--radius-sm);
    padding: 0.6rem 1.2rem;
    font-size: 0.95rem;
    font-weight: 600;
    font-family: inherit;
    cursor: pointer;
    transition: background 0.15s, transform 0.1s, box-shadow 0.15s;
}
.btn:active { transform: scale(0.97); }
.btn:focus-visible { outline: none; box-shadow: var(--focus-ring); }
.btn-primary {
    background: var(--primary-grad);
    color: oklch(99% 0.002 250);
    box-shadow: 0 2px 12px oklch(51% 0.17 252 / 0.35);
    transition: var(--transition-smooth);
}
.btn-primary:hover { filter: brightness(1.12); box-shadow: var(--shadow-glow-blue); }

/* Orange Akzent-Button – wie CTA auf ithummel.com */
.btn-accent {
    background: linear-gradient(135deg, var(--brand-orange) 0%, var(--brand-orange-dark) 100%);
    color: oklch(99% 0.002 250);
    box-shadow: 0 2px 12px oklch(62% 0.16 52 / 0.35);
    transition: var(--transition-smooth);
}
.btn-accent:hover { filter: brightness(1.1); box-shadow: var(--shadow-glow-orange); }
.btn-secondary { background: var(--secondary-bg); color: var(--text); }
.btn-secondary:hover { background: var(--secondary-hover); }
.btn-danger { background: var(--danger-bg); color: var(--danger); }
.btn-danger:hover { background: var(--danger-hover); }
.btn-small { padding: 0.35rem 0.75rem; font-size: 0.85rem; }
.btn-block { width: 100%; }
.btn-row { display: flex; gap: 0.6rem; margin-top: 0.8rem; flex-wrap: wrap; }

/* ---------- Formulare ---------- */
label { display: block; margin-bottom: 0.85rem; font-size: 0.88rem; font-weight: 600; }
input[type="text"], input[type="password"], input[type="number"], input[type="email"] {
    display: block;
    width: 100%;
    padding: 0.65rem 0.85rem;
    margin-top: 0.3rem;
    border: 1.5px solid var(--border);
    border-radius: var(--radius-sm);
    font-size: 1rem;
    font-family: inherit;
    background: var(--input-bg);
    color: var(--text);
    transition: border-color 0.15s, box-shadow 0.15s;
}
input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: var(--focus-ring);
}
input[type="file"] { font-family: inherit; color: var(--text); }

.row { display: flex; gap: 1rem; flex-wrap: wrap; }
.row > label { flex: 1 1 180px; }

.checkbox-label {
    display: flex; align-items: center; gap: 0.5rem;
    margin-top: 1.6rem; font-weight: 400;
}
.checkbox-label input { width: auto; margin: 0; }

.error { color: var(--danger); font-size: 0.9rem; }
.hint { color: var(--muted); font-size: 0.85rem; }

/* ---------- Auth ---------- */
.auth-card {
    max-width: 400px;
    margin: 3.5rem auto;
    padding: 1.8rem;
    box-shadow: var(--shadow-lg);
    border: none;
}
.auth-links { text-align: center; margin: 0.9rem 0 0; font-size: 0.85rem; }
.auth-links a { color: var(--primary); text-decoration: none; font-weight: 500; }
.auth-links a:hover { text-decoration: underline; }
.tabs {
    display: flex;
    gap: 0.3rem;
    margin-bottom: 1.4rem;
    background: var(--secondary-bg);
    padding: 0.3rem;
    border-radius: var(--radius-sm);
}
.tab {
    flex: 1;
    background: none;
    border: none;
    padding: 0.55rem;
    font-size: 0.95rem;
    font-family: inherit;
    font-weight: 600;
    cursor: pointer;
    color: var(--muted);
    border-radius: 8px;
    transition: background 0.15s, color 0.15s, box-shadow 0.15s;
}
.tab.active {
    color: var(--primary);
    background: var(--card-bg);
    box-shadow: var(--shadow-sm);
}

/* ---------- Datensatz-Karten ---------- */
.dataset-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
    gap: 1rem;
    margin-bottom: 1.2rem;
}
.dataset-card {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1.15rem;
    display: flex;
    flex-direction: column;
    gap: 0.45rem;
    box-shadow: var(--shadow-sm);
    transition: transform 0.18s, box-shadow 0.18s, border-color 0.18s;
}
.dataset-card:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-md);
    border-color: var(--brand-orange);
}
.dataset-card h3 { margin: 0; font-size: 1.05rem; letter-spacing: -0.01em; }
.dataset-card .langs { color: var(--muted); font-size: 0.85rem; }
.dataset-card .meta { font-size: 0.8rem; color: var(--muted); }
.dataset-card .btn-row { margin-top: auto; }

.ds-progress {
    height: 7px;
    background: var(--secondary-bg);
    border-radius: 999px;
    overflow: hidden;
    margin: 0.35rem 0;
}
.ds-progress-inner {
    height: 100%;
    background: var(--success-grad);
    border-radius: 999px;
    transition: width 0.4s ease;
}

/* ---------- Tabelle ---------- */
.table-wrap { overflow-x: auto; border-radius: var(--radius-sm); }
table { width: 100%; border-collapse: collapse; font-size: 0.9rem; }
th, td { text-align: left; padding: 0.6rem 0.7rem; border-bottom: 1px solid var(--border); }
th {
    background: var(--thead-bg);
    font-weight: 600;
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    color: var(--muted);
}
tbody tr { transition: background 0.12s; }
tbody tr:hover { background: var(--thead-bg); }
td .btn { margin-right: 0.3rem; }

.badge {
    display: inline-block;
    padding: 0.1rem 0.55rem;
    border-radius: 999px;
    font-size: 0.75rem;
    font-weight: 600;
}
.badge-mastered { background: var(--success-bg); color: var(--success); }
.badge-open { background: var(--warn-bg); color: var(--warn-text); }

/* ---------- Training ---------- */
.direction-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
    gap: 0.5rem;
    margin-bottom: 1rem;
}
.direction-grid label {
    display: flex; align-items: center; gap: 0.5rem;
    font-weight: 500; margin: 0;
    padding: 0.55rem 0.75rem;
    border: 1.5px solid var(--border);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: border-color 0.15s, background 0.15s;
}
.direction-grid label:hover { border-color: var(--primary); }
.direction-grid label:has(input:checked) {
    border-color: var(--primary);
    background: color-mix(in srgb, var(--primary) 8%, transparent);
}
.direction-grid input { width: auto; margin: 0; accent-color: var(--brand-orange); }

#training-progressbar {
    height: 8px;
    background: var(--secondary-bg);
    border-radius: 999px;
    overflow: hidden;
    margin-bottom: 0.8rem;
}
#training-progress-inner {
    height: 100%; width: 0;
    background: var(--success-grad);
    border-radius: 999px;
    transition: width 0.4s ease;
}

.training-meta { color: var(--muted); font-size: 0.85rem; margin: 0 0 0.5rem; }
.training-question {
    font-size: 1.7rem;
    font-weight: 800;
    letter-spacing: -0.02em;
    margin: 0.4rem 0 1rem;
    background: var(--gradient-brand);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    width: fit-content;
}

#training-feedback {
    margin-top: 1rem;
    padding: 0.85rem 1.1rem;
    border-radius: var(--radius-sm);
    font-weight: 500;
    animation: fadeIn 0.25s ease both;
}
#training-feedback.correct { background: var(--success-bg); color: var(--success); }
#training-feedback.wrong { background: var(--danger-bg); color: var(--danger); }

/* ---------- Checkbox-Akzent ---------- */
input[type="checkbox"] { accent-color: var(--brand-orange); width: 1.05rem; height: 1.05rem; }

/* ---------- Scrollbar (dezent) ---------- */
::-webkit-scrollbar { width: 10px; height: 10px; }
::-webkit-scrollbar-thumb { background: var(--secondary-hover); border-radius: 999px; }
::-webkit-scrollbar-track { background: transparent; }

/* ---------- Footer & Rechtliches ---------- */
footer {
    margin-top: 3rem;
    border-top: 1px solid var(--border);
    padding: 1.2rem 1.5rem;
    font-size: 0.85rem;
    color: var(--muted);
}
.footer-inner {
    max-width: 920px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 1rem;
    flex-wrap: wrap;
}
.footer-links { display: flex; gap: 1.2rem; }
.footer-links a { color: var(--muted); text-decoration: none; }
.footer-links a:hover { color: var(--primary); text-decoration: underline; }

.legal-card { max-width: 720px; margin: 0 auto; }
.legal-card h2 { margin-top: 0.8rem; }
.legal-card h3 { margin: 1.4rem 0 0.4rem; font-size: 1.02rem; }
.legal-card p, .legal-card li { font-size: 0.92rem; }
.btn-legal-back { margin-bottom: 0.5rem; }

.account-zone {
    margin-top: 2.5rem;
    padding-top: 1rem;
    border-top: 1px dashed var(--border);
    text-align: right;
}

@media (max-width: 600px) {
    .training-question { font-size: 1.35rem; }
    main { margin-top: 1rem; }
    .card { padding: 1.1rem; }
    .auth-card { margin: 1.5rem auto; }
}