/* ==============================================================================
   Startseite (home.css) – Präfix hp-
   Idee: Rechenblock-Papier als Hero-Hintergrund, Taschenrechner-Display als Schnellrechner,
   Kennzahlen statt Icon-Karten, Themenbereiche als Verzeichnis.
   ============================================================================== */

.visually-hidden {
    position: absolute !important;
    width: 1px; height: 1px;
    margin: -1px; padding: 0;
    overflow: hidden; clip: rect(0, 0, 0, 0);
    white-space: nowrap; border: 0;
}

.hp-section { padding: clamp(2.75rem, 5vw, 5rem) 0; }
.hp-head { max-width: 640px; margin-bottom: 2rem; }
.hp-head h2 {
    font-size: clamp(1.6rem, 2.2vw + 0.8rem, 2.35rem);
    letter-spacing: -0.02em;
    line-height: 1.15;
    margin-bottom: 0.5rem;
}
.hp-head p { color: var(--text-muted); font-size: 1.05rem; }

/* ---------- Hero ---------- */
.hp-hero {
    position: relative;
    padding: clamp(2.5rem, 5vw, 4.5rem) 0 clamp(2.5rem, 5vw, 4rem);
    background-color: var(--bg-page);
    background-image:
        linear-gradient(to right, rgba(18, 122, 104, 0.07) 1px, transparent 1px),
        linear-gradient(to bottom, rgba(18, 122, 104, 0.07) 1px, transparent 1px);
    background-size: 32px 32px;
    border-bottom: 1px solid var(--border-subtle);
    overflow: hidden;
}
.hp-hero::after {
    content: "";
    position: absolute; inset: 0;
    background: linear-gradient(to bottom, transparent 55%, var(--bg-page) 100%);
    pointer-events: none;
}
.hp-hero-grid {
    position: relative; z-index: 1;
    display: grid;
    grid-template-columns: minmax(0, 1fr);
    gap: 2.5rem;
    align-items: center;
}
.hp-hero-grid > * { min-width: 0; }
@media (min-width: 960px) {
    .hp-hero-grid { grid-template-columns: minmax(0, 1.2fr) minmax(0, 0.8fr); gap: 4rem; }
}

.hp-stand {
    display: inline-block;
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--color-primary-700);
    margin-bottom: 1rem;
    padding-left: 0.75rem;
    border-left: 3px solid var(--color-accent-amber);
}
.hp-hero-title {
    font-family: var(--font-heading);
    font-weight: 800;
    font-size: clamp(2.2rem, 4.4vw + 0.6rem, 3.9rem);
    line-height: 1.04;
    letter-spacing: -0.035em;
    max-width: 17ch;
    text-wrap: balance;
    margin-bottom: 1.25rem;
}
.hp-hero-sub {
    font-size: clamp(1.05rem, 0.8vw + 0.85rem, 1.25rem);
    color: var(--text-muted);
    max-width: 52ch;
    margin-bottom: 1.75rem;
}

.hp-search { position: relative; max-width: 560px; }
.hp-search-icon {
    position: absolute; left: 1.1rem; top: 50%;
    width: 22px; height: 22px;
    transform: translateY(-50%);
    color: var(--color-primary-600);
    pointer-events: none;
}
.hp-search-input {
    width: 100%;
    min-height: 56px;
    padding: 0.75rem 1.25rem 0.75rem 3.1rem;
    font-size: 1.05rem;
    background: var(--bg-surface);
    border: 2px solid var(--border-medium);
    border-radius: var(--radius-md);
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}
.hp-search-input:focus {
    outline: none;
    border-color: var(--color-primary-600);
    box-shadow: 0 0 0 4px rgba(18, 122, 104, 0.18);
}

.hp-quick {
    display: flex; flex-wrap: wrap; align-items: center;
    gap: 0.5rem;
    margin-top: 1rem;
    font-size: 0.9rem;
}
.hp-quick-label { color: var(--text-muted); margin-right: 0.25rem; }
.hp-chip {
    display: inline-flex; align-items: center;
    min-height: 36px;
    padding: 0.25rem 0.85rem;
    background: var(--bg-surface);
    border: 1px solid var(--border-medium);
    border-radius: var(--radius-full);
    color: var(--text-main);
    font-weight: 500;
    transition: border-color var(--transition-fast), background var(--transition-fast);
}
.hp-chip:hover { border-color: var(--color-primary-600); background: var(--color-primary-50); }

/* ---------- Schnellrechner im Display-Stil ---------- */
.hp-lcd {
    background: #08201B;
    color: #D5EFE8;
    border: 1px solid #1B4A40;
    border-radius: 20px;
    padding: 1.5rem;
    box-shadow: 0 24px 48px -24px rgba(8, 32, 27, 0.55);
}
.hp-lcd-title { font-size: 0.95rem; font-weight: 600; color: #8FD9C8; margin-bottom: 1rem; }
.hp-lcd-screen {
    display: flex; flex-direction: column;
    gap: 0.15rem;
    padding: 1.1rem 1.25rem;
    background: #03130F;
    border: 1px solid #14352E;
    border-radius: 14px;
    margin-bottom: 1.25rem;
}
.hp-lcd-label { font-size: 0.8rem; color: #7FB8AA; }
.hp-lcd-value {
    font-family: var(--font-heading);
    font-weight: 800;
    font-size: clamp(2rem, 3.2vw + 0.6rem, 3rem);
    line-height: 1.1;
    letter-spacing: -0.02em;
    font-variant-numeric: tabular-nums;
    color: var(--color-accent-amber);
}
.hp-lcd-formula { font-size: 0.8rem; color: #7FB8AA; font-variant-numeric: tabular-nums; min-height: 1.2em; }

.hp-lcd-controls { display: grid; gap: 1rem; }
.hp-lcd-field label { display: block; font-size: 0.85rem; font-weight: 600; margin-bottom: 0.4rem; color: #BFE5DB; }
.hp-lcd-range { display: flex; align-items: center; gap: 0.9rem; }
.hp-lcd-range input[type=range] { flex: 1; accent-color: var(--color-accent-amber); min-height: 32px; }
.hp-lcd-range output { min-width: 3.2rem; text-align: right; font-weight: 700; font-variant-numeric: tabular-nums; }
.hp-lcd-input {
    display: flex; align-items: center;
    background: #03130F;
    border: 1px solid #1B4A40;
    border-radius: 10px;
    padding-right: 0.9rem;
}
.hp-lcd-input:focus-within { border-color: var(--color-accent-amber); box-shadow: 0 0 0 3px rgba(242, 176, 30, 0.25); }
.hp-lcd-input input {
    flex: 1; min-width: 0;
    min-height: 46px;
    padding: 0.5rem 0.9rem;
    background: transparent; border: 0; outline: 0;
    color: #fff; font-size: 1.05rem; font-variant-numeric: tabular-nums;
}
.hp-lcd-input span { color: #7FB8AA; font-weight: 600; }
.hp-lcd-link {
    display: inline-block;
    margin-top: 1.25rem;
    color: var(--color-accent-amber);
    font-weight: 600;
    text-decoration: underline;
    text-underline-offset: 3px;
}
.hp-lcd-link:hover { color: #FFD571; }

/* ---------- Meistgesucht: Kennzahlen ---------- */
.hp-featured { background: var(--bg-surface); border-bottom: 1px solid var(--border-subtle); }
.hp-stats { display: grid; grid-template-columns: 1fr; gap: 1rem; }
@media (min-width: 600px) { .hp-stats { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 1000px) { .hp-stats { grid-template-columns: repeat(4, 1fr); } }

.hp-stat {
    display: flex; flex-direction: column;
    padding: 1.4rem 1.4rem 1.5rem;
    border: 1px solid var(--border-medium);
    border-top: 4px solid var(--color-primary-600);
    border-radius: 12px;
    background: var(--bg-page);
    color: inherit;
    transition: border-color var(--transition-fast), background var(--transition-fast), transform var(--transition-fast);
}
.hp-stat:hover { background: var(--color-primary-50); border-top-color: var(--color-accent-amber); transform: translateY(-2px); }
.hp-stat-num {
    font-family: var(--font-heading);
    font-weight: 800;
    font-size: clamp(2rem, 2.2vw + 1rem, 2.75rem);
    line-height: 1;
    letter-spacing: -0.03em;
    font-variant-numeric: tabular-nums;
    color: var(--color-primary-700);
}
.hp-stat-label { font-size: 0.85rem; color: var(--text-muted); margin: 0.35rem 0 1.1rem; }
.hp-stat-title { font-family: var(--font-heading); font-weight: 700; font-size: 1.1rem; margin-bottom: 0.35rem; }
.hp-stat-desc { font-size: 0.9rem; color: var(--text-muted); line-height: 1.5; }

/* ---------- Verzeichnis nach Themenbereich ---------- */
.hp-cat {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1rem 3rem;
    padding: 2rem 0;
    border-top: 1px solid var(--border-medium);
}
@media (min-width: 900px) { .hp-cat { grid-template-columns: 280px minmax(0, 1fr); } }
.hp-cat-side h3 { font-size: 1.35rem; letter-spacing: -0.01em; margin-bottom: 0.4rem; }
.hp-cat-side h3 a { color: var(--text-main); }
.hp-cat-side h3 a:hover { color: var(--color-primary-700); text-decoration: underline; text-underline-offset: 4px; }
.hp-cat-side p { font-size: 0.925rem; color: var(--text-muted); line-height: 1.55; }
@media (min-width: 900px) { .hp-cat-side { position: sticky; top: 96px; align-self: start; } }

.hp-rows { display: grid; grid-template-columns: 1fr; gap: 0.75rem; }

.hp-row {
    display: grid;
    grid-template-columns: 44px minmax(0, 1fr) auto;
    gap: 1rem;
    align-items: center;
    padding: 1rem 1.1rem;
    background: var(--bg-surface);
    border: 1px solid var(--border-subtle);
    border-radius: 12px;
    color: inherit;
    transition: border-color var(--transition-fast), background var(--transition-fast);
}
.hp-row:hover { border-color: var(--color-primary-600); background: var(--color-primary-50); }
.hp-row[hidden], .hp-cat[hidden], .hp-empty[hidden] { display: none; }
.hp-row-icon {
    display: inline-flex; align-items: center; justify-content: center;
    width: 44px; height: 44px;
    border-radius: 10px;
    background: var(--color-primary-50);
    color: var(--color-primary-700);
}
.hp-row:hover .hp-row-icon { background: var(--bg-surface); }
.hp-row-icon svg { width: 24px; height: 24px; }
.hp-row-main { display: flex; flex-direction: column; gap: 0.15rem; min-width: 0; }
.hp-row-title { font-family: var(--font-heading); font-weight: 700; font-size: 1.05rem; }
.hp-row-desc { font-size: 0.875rem; color: var(--text-muted); line-height: 1.45; }
.hp-row-fig { text-align: right; display: flex; flex-direction: column; line-height: 1.15; }
.hp-row-fig strong { font-family: var(--font-heading); font-weight: 800; font-size: 1.15rem; font-variant-numeric: tabular-nums; color: var(--color-primary-700); }
.hp-row-fig small { font-size: 0.75rem; color: var(--text-muted); }
@media (max-width: 560px) {
    .hp-row { grid-template-columns: 40px minmax(0, 1fr); }
    .hp-row-fig { grid-column: 2; text-align: left; flex-direction: row; gap: 0.5rem; align-items: baseline; }
}
.hp-empty { padding: 1.5rem; text-align: center; color: var(--text-muted); border: 1px dashed var(--border-medium); border-radius: 12px; }

/* ---------- Warum ---------- */
.hp-why { background: var(--bg-surface); border-top: 1px solid var(--border-subtle); border-bottom: 1px solid var(--border-subtle); }
.hp-why-grid { display: grid; grid-template-columns: 1fr; gap: 1.75rem; }
@media (min-width: 640px) { .hp-why-grid { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 1000px) { .hp-why-grid { grid-template-columns: repeat(4, 1fr); gap: 2rem; } }
.hp-why-grid > div { padding-top: 1rem; border-top: 3px solid var(--color-primary-600); }
.hp-why-grid h3 { font-size: 1.1rem; margin-bottom: 0.45rem; }
.hp-why-grid p { font-size: 0.95rem; color: var(--text-muted); line-height: 1.6; }

/* ---------- Text & FAQ ---------- */
.section-seo-text { background: var(--bg-page); }
.section-seo-text .seo-text-container { max-width: 760px; }
.section-seo-text h2 { font-size: clamp(1.5rem, 2vw + 0.8rem, 2.1rem); letter-spacing: -0.02em; margin-bottom: 1rem; }
.section-seo-text p { line-height: 1.75; margin-bottom: 1.1rem; color: var(--text-main); }
.section-seo-text a { color: var(--color-primary-700); text-decoration: underline; text-underline-offset: 3px; }
.hp-faq { background: var(--bg-surface); border-top: 1px solid var(--border-subtle); }
.hp-faq .hp-head { max-width: none; }

@media (prefers-reduced-motion: reduce) {
    .hp-stat, .hp-row, .hp-chip { transition: none; }
    .hp-stat:hover { transform: none; }
}

/* Header: Navigationspunkte nie umbrechen */
.desktop-nav .nav-link, .desktop-nav .dropdown-toggle { white-space: nowrap; }

/* Kleine Bildschirme: Header darf nicht breiter als der Viewport werden */
@media (max-width: 480px) {
    .site-header .logo-badge { display: none; }
    .header-actions { gap: 0.35rem; }
    .header-inner { gap: 0.5rem; }
    .site-logo .logo-main { font-size: 1.05rem; }
}

/* Artikel-Tabellen auf kleinen Bildschirmen horizontal scrollbar statt Seite zu verbreitern */
@media (max-width: 720px) {
    .article-table, .result-table { display: block; max-width: 100%; overflow-x: auto; -webkit-overflow-scrolling: touch; }
}