:root {
    --navy: #0b2540;
    --blue: #0f4c81;
    --teal: #12a3a3;
    --teal-light: #e6f7f7;
    --bg: #f4f7f9;
    --card: #ffffff;
    --text: #1c2b3a;
    --muted: #64748b;
    --border: #e2e8f0;
    --danger: #c0392b;
    --success: #1e8e5a;
    --radius: 14px;
}

* { box-sizing: border-box; }

body {
    margin: 0;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background: var(--bg);
    color: var(--text);
    -webkit-tap-highlight-color: transparent;
}

.topbar {
    background: linear-gradient(135deg, var(--navy), var(--blue));
    color: #fff;
    padding: 14px 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 10px;
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: 0 2px 10px rgba(0,0,0,0.15);
}

.brand { font-size: 20px; font-weight: 700; display: flex; align-items: baseline; gap: 6px; flex-wrap: wrap; }
.brand-mark { color: var(--teal); }
.brand-sub { font-size: 12px; font-weight: 400; color: #cbd8e6; margin-left: 10px; }

.topnav { display: flex; gap: 4px; flex-wrap: wrap; }
.topnav a {
    color: #dfe9f3;
    text-decoration: none;
    padding: 10px 16px;
    border-radius: 10px;
    font-size: 15px;
    font-weight: 600;
    transition: background 0.15s;
}
.topnav a:hover, .topnav a.active {
    background: rgba(255,255,255,0.15);
    color: #fff;
}

.content {
    max-width: 1200px;
    margin: 0 auto;
    padding: 24px 20px 60px;
    min-height: 70vh;
}

.footer {
    text-align: center;
    color: var(--muted);
    font-size: 12px;
    padding: 20px;
}

h1 { font-size: 28px; margin: 0 0 6px; color: var(--navy); }
h2 { font-size: 20px; color: var(--navy); }
.subtitle { color: var(--muted); margin-bottom: 24px; font-size: 15px; }

/* Kachel-Grid für Start & Lösungen */
.tile-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 18px;
    margin-top: 20px;
}
.tile {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 26px 22px;
    text-decoration: none;
    color: var(--text);
    box-shadow: 0 1px 3px rgba(0,0,0,0.05);
    transition: transform 0.15s, box-shadow 0.15s;
    display: block;
}
.tile:active, .tile:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(15,76,129,0.15);
}
.tile-icon { font-size: 34px; margin-bottom: 10px; display: block; }
.tile h3 { margin: 0 0 6px; color: var(--navy); font-size: 18px; }
.tile p { margin: 0; color: var(--muted); font-size: 14px; line-height: 1.4; }

/* Karten */
.card {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 24px;
    margin-bottom: 20px;
    box-shadow: 0 1px 3px rgba(0,0,0,0.05);
}

/* Buttons */
.btn {
    display: inline-block;
    background: var(--teal);
    color: #fff;
    border: none;
    padding: 14px 26px;
    border-radius: 10px;
    font-size: 16px;
    font-weight: 700;
    cursor: pointer;
    text-decoration: none;
    text-align: center;
}
.btn:hover { background: #0e8f8f; }
.btn-secondary { background: var(--blue); }
.btn-secondary:hover { background: #0c3d68; }
.btn-outline { background: transparent; color: var(--blue); border: 2px solid var(--blue); }
.btn-danger { background: var(--danger); }
.btn-block { display: block; width: 100%; }
.btn-sm { padding: 8px 14px; font-size: 14px; }

/* Formulare */
label { display: block; font-weight: 600; margin: 14px 0 6px; font-size: 14px; color: var(--navy); }
input[type=text], input[type=email], input[type=tel], input[type=number], select, textarea {
    width: 100%;
    padding: 14px 14px;
    font-size: 16px;
    border: 2px solid var(--border);
    border-radius: 10px;
    background: #fff;
    color: var(--text);
}
input:focus, select:focus, textarea:focus { outline: none; border-color: var(--teal); }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 0 20px; }
@media (max-width: 640px) { .form-row { grid-template-columns: 1fr; } }

.radio-group { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 6px; }
.radio-group label {
    margin: 0;
    font-weight: 500;
    background: #fff;
    border: 2px solid var(--border);
    padding: 12px 18px;
    border-radius: 10px;
    cursor: pointer;
    flex: 1 1 auto;
    text-align: center;
}
.radio-group input { display: none; }
.radio-group input:checked + span { color: var(--teal); font-weight: 700; }
.radio-group label:has(input:checked) { border-color: var(--teal); background: var(--teal-light); }

.alert { padding: 14px 18px; border-radius: 10px; margin-bottom: 18px; font-weight: 600; }
.alert-success { background: #e5f6ee; color: var(--success); border: 1px solid #b7e4cc; }
.alert-error { background: #fdecea; color: var(--danger); border: 1px solid #f5c6c0; }

/* Tabelle */
table { width: 100%; border-collapse: collapse; background: #fff; border-radius: var(--radius); overflow: hidden; }
th, td { padding: 12px 14px; text-align: left; border-bottom: 1px solid var(--border); font-size: 14px; }
th { background: var(--navy); color: #fff; font-weight: 600; }
tr:hover td { background: #f8fafc; }
.table-wrap { overflow-x: auto; background: #fff; border-radius: var(--radius); border: 1px solid var(--border); }
.table-wrap table { border-radius: 0; }

.badge { display: inline-block; padding: 4px 10px; border-radius: 20px; font-size: 12px; font-weight: 700; }
.badge-frei { background: #e5f6ee; color: var(--success); }
.badge-belegt { background: #fdecea; color: var(--danger); }

/* Detailansicht Lösung */
.detail-header { display: flex; align-items: center; gap: 16px; margin-bottom: 20px; }
.detail-header .tile-icon { font-size: 48px; margin: 0; }
.back-link { display: inline-block; margin-bottom: 16px; color: var(--blue); text-decoration: none; font-weight: 600; }
.back-link:hover { text-decoration: underline; }

ul.benefits { list-style: none; padding: 0; margin: 16px 0; }
ul.benefits li { padding: 10px 0 10px 30px; position: relative; border-bottom: 1px solid var(--border); }
ul.benefits li:before { content: "✓"; position: absolute; left: 0; color: var(--teal); font-weight: 900; font-size: 18px; }

/* ROI Rechner */
.result-box {
    background: linear-gradient(135deg, var(--navy), var(--blue));
    color: #fff;
    border-radius: var(--radius);
    padding: 28px;
    margin-top: 20px;
    text-align: center;
}
.result-box .big-number { font-size: 42px; font-weight: 800; color: #7ee8e8; margin: 8px 0; }
.result-box .label { font-size: 14px; color: #cbd8e6; text-transform: uppercase; letter-spacing: 0.5px; }
.result-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(150px,1fr)); gap: 20px; margin-top: 10px; }

/* FAQ */
.faq-search { margin-bottom: 20px; }
.faq-item { background: #fff; border: 1px solid var(--border); border-radius: 10px; margin-bottom: 10px; overflow: hidden; }
.faq-question {
    padding: 16px 18px;
    font-weight: 700;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    color: var(--navy);
}
.faq-answer { padding: 0 18px 18px; color: var(--muted); line-height: 1.6; display: none; }
.faq-item.open .faq-answer { display: block; }
.faq-item.open .faq-arrow { transform: rotate(180deg); }
.faq-arrow { transition: transform 0.2s; color: var(--teal); }
.faq-cat { display: inline-block; font-size: 11px; text-transform: uppercase; letter-spacing: 0.5px; color: var(--teal); font-weight: 700; margin-bottom: 4px; }

/* Termine */
.day-tabs { display: flex; gap: 8px; margin-bottom: 18px; flex-wrap: wrap; }
.day-tab {
    padding: 10px 20px; border-radius: 10px; border: 2px solid var(--border);
    background: #fff; font-weight: 700; cursor: pointer; color: var(--navy); text-decoration: none;
}
.day-tab.active { background: var(--teal); border-color: var(--teal); color: #fff; }
.slot-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(160px,1fr)); gap: 12px; }
.slot {
    border: 2px solid var(--border); border-radius: 10px; padding: 16px; text-align: center; background: #fff;
}
.slot.frei { border-color: var(--success); }
.slot.belegt { border-color: var(--danger); background: #fff8f7; }
.slot .time { font-size: 18px; font-weight: 800; color: var(--navy); }
.slot .who { font-size: 12px; color: var(--muted); margin-top: 4px; }

.section-title { display: flex; justify-content: space-between; align-items: center; margin-bottom: 10px; flex-wrap: wrap; gap: 10px; }

@media (max-width: 700px) {
    .topbar { flex-direction: column; align-items: flex-start; }
    .topnav a { padding: 8px 12px; font-size: 14px; }
    .content { padding: 16px 12px 40px; }
}