:root {
    --primary-dark: #435E81;
    --primary-light: #559CAD;
    --accent: #E8836B;
    --bg-primary: #FFFFFF;
    --bg-secondary: #F5F7FA;
    --bg-card: #FFFFFF;
    --text-primary: #435E81;
    --text-secondary: #6B7280;
    --shadow-color: rgba(67, 94, 129, 0.1);
    --hero-gradient: linear-gradient(135deg, var(--primary-light) 0%, var(--primary-dark) 100%);
}

[data-theme="dark"] {
    --bg-primary: #1a1f2e;
    --bg-secondary: #242b3d;
    --bg-card: #2d3548;
    --text-primary: #e2e8f0;
    --text-secondary: #a0aec0;
    --shadow-color: rgba(0, 0, 0, 0.3);
    --hero-gradient: linear-gradient(135deg, #2d4a5e 0%, #1a2d3d 100%);
}

@media (prefers-color-scheme: dark) {
    :root:not([data-theme="light"]) {
        --bg-primary: #1a1f2e;
        --bg-secondary: #242b3d;
        --bg-card: #2d3548;
        --text-primary: #e2e8f0;
        --text-secondary: #a0aec0;
        --shadow-color: rgba(0, 0, 0, 0.3);
        --hero-gradient: linear-gradient(135deg, #2d4a5e 0%, #1a2d3d 100%);
    }
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
    line-height: 1.6;
    color: var(--text-primary);
    background: var(--bg-primary);
    transition: background 0.3s ease, color 0.3s ease;
}

/* Theme Toggle */
.theme-toggle {
    position: fixed;
    top: 1.5rem;
    right: 1.5rem;
    z-index: 100;
    background: var(--bg-card);
    border: none;
    border-radius: 50%;
    width: 50px;
    height: 50px;
    cursor: pointer;
    box-shadow: 0 4px 15px var(--shadow-color);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    transition: all 0.3s ease;
}

.theme-toggle:hover {
    transform: scale(1.1);
}

.theme-toggle .icon-sun,
.theme-toggle .icon-moon {
    position: absolute;
    transition: opacity 0.3s ease, transform 0.3s ease;
}

.theme-toggle .icon-sun {
    opacity: 0;
    transform: rotate(-90deg);
}

.theme-toggle .icon-moon {
    opacity: 1;
    transform: rotate(0deg);
}

[data-theme="dark"] .theme-toggle .icon-sun {
    opacity: 1;
    transform: rotate(0deg);
}

[data-theme="dark"] .theme-toggle .icon-moon {
    opacity: 0;
    transform: rotate(90deg);
}

@media (prefers-color-scheme: dark) {
    :root:not([data-theme="light"]) .theme-toggle .icon-sun {
        opacity: 1;
        transform: rotate(0deg);
    }
    :root:not([data-theme="light"]) .theme-toggle .icon-moon {
        opacity: 0;
        transform: rotate(90deg);
    }
}

/* Hero Section */
.hero {
    min-height: 100vh;
    background: var(--hero-gradient);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 2rem;
    position: relative;
    overflow: hidden;
    transition: background 0.3s ease;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    /* The SVGs render fine in WebKit since their broken drop-shadow filters
       (no filterUnits → objectBoundingBox blow-up) were removed — no Safari
       special-casing needed anymore. */
    background: url('../icons/logo-background.png') center center no-repeat;
    background: url('../icons/logo-background.svg') center center no-repeat;
    background-size: cover;
    opacity: 0.1;
}

.hero-content {
    position: relative;
    z-index: 1;
    max-width: 700px;
}

.logo {
    width: 180px;
    height: 180px;
    margin-bottom: 2rem;
    filter: drop-shadow(0 10px 30px rgba(0, 0, 0, 0.2));
}

.hero h1 {
    font-size: 3.5rem;
    color: var(--white);
    margin-bottom: 1rem;
    font-weight: 700;
}

.hero p {
    font-size: 1.4rem;
    color: rgba(255, 255, 255, 0.9);
    margin-bottom: 2.5rem;
}

.cta-button {
    display: inline-block;
    background: var(--accent);
    color: var(--white);
    padding: 1rem 3rem;
    font-size: 1.2rem;
    font-weight: 600;
    text-decoration: none;
    border-radius: 50px;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(232, 131, 107, 0.4);
}

.cta-button:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 25px rgba(232, 131, 107, 0.5);
    background: #d9705a;
}

/* Features Section */
.features {
    padding: 5rem 2rem;
    background: var(--bg-secondary);
    transition: background 0.3s ease;
}

.features-container {
    max-width: 1100px;
    margin: 0 auto;
}

.features h2 {
    text-align: center;
    font-size: 2.5rem;
    color: var(--text-primary);
    margin-bottom: 3rem;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.feature-card {
    background: var(--bg-card);
    padding: 2rem;
    border-radius: 16px;
    box-shadow: 0 4px 20px var(--shadow-color);
    transition: transform 0.3s ease, background 0.3s ease;
}

.feature-card:hover {
    transform: translateY(-5px);
}

.feature-icon {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.feature-card h3 {
    font-size: 1.3rem;
    color: var(--text-primary);
    margin-bottom: 0.75rem;
}

.feature-card p {
    color: var(--text-secondary);
    font-size: 1rem;
}

/* Pledge: never client-side scanning */
.pledge {
    padding: 4rem 2rem;
    background: var(--bg-primary);
    transition: background 0.3s ease;
}

.pledge-card {
    max-width: 760px;
    margin: 0 auto;
    text-align: center;
    background: var(--bg-card);
    border: 2px solid var(--accent);
    border-radius: 20px;
    padding: 2.75rem 2rem;
    box-shadow: 0 4px 24px var(--shadow-color);
    transition: background 0.3s ease;
}

.pledge-icon {
    margin-bottom: 0.75rem;
    line-height: 0;
}

.pledge-card h2 {
    color: var(--accent);
    font-size: 1.9rem;
    margin: 0 0 1rem;
}

.pledge-card p {
    color: var(--text-secondary);
    font-size: 1.1rem;
    line-height: 1.75;
    margin: 0;
}

.pledge-card em {
    color: var(--text-primary);
    font-style: italic;
}

/* Footer */
.footer {
    background: var(--bg-secondary);
    color: var(--text-primary);
    text-align: center;
    padding: 2rem;
    border-top: 1px solid var(--shadow-color);
    transition: background 0.3s ease;
}

.footer a {
    color: var(--primary-light);
    text-decoration: none;
}

.footer a:hover {
    text-decoration: underline;
}

.footer .open-source-notice {
    margin-top: 0.5rem;
    font-size: 0.9rem;
    opacity: 0.7;
}

/* Responsive */
@media (max-width: 768px) {
    .hero h1 {
        font-size: 2.5rem;
    }

    .hero p {
        font-size: 1.1rem;
    }

    .logo {
        width: 140px;
        height: 140px;
    }

    .features h2 {
        font-size: 2rem;
    }
}

/* ── E2E flow diagram section ─────────────────────────────────────────── */
.flow {
    padding: 5rem 2rem;
    background: var(--bg-primary);
    transition: background 0.3s ease;
}

.flow-container {
    max-width: 1100px;
    margin: 0 auto;
}

.flow h2 {
    text-align: center;
    font-size: 2.5rem;
    color: var(--text-primary);
    margin-bottom: 1rem;
}

.flow-intro {
    text-align: center;
    color: var(--text-secondary);
    max-width: 700px;
    margin: 0 auto 3rem;
}

.flow-diagram {
    overflow-x: auto;
    text-align: center;
}

.flow-diagram svg {
    max-width: 100%;
    height: auto;
}

.flow-block {
    margin-bottom: 3.5rem;
}

.flow-block h3 {
    color: var(--text-primary);
    font-size: 1.4rem;
    margin-bottom: 1rem;
    text-align: center;
}

/* Accordion (index) */
details.flow-block {
    margin-bottom: 0.9rem;
    border: 1px solid var(--border-color, rgba(127,127,127,0.25));
    border-radius: 12px;
    background: var(--bg-secondary);
    overflow: hidden;
}

details.flow-block summary {
    display: flex;
    align-items: center;
    gap: 0.8rem;
    padding: 0.95rem 1.2rem;
    cursor: pointer;
    list-style: none;
    color: var(--text-primary);
    font-size: 1.05rem;
    font-weight: 600;
    user-select: none;
}

details.flow-block summary::-webkit-details-marker {
    display: none;
}

details.flow-block summary:hover {
    background: rgba(127, 127, 127, 0.08);
}

.flow-icon {
    display: inline-flex;
    flex-shrink: 0;
}

.flow-icon svg {
    display: block;
}

.flow-chevron {
    margin-left: auto;
    color: var(--text-secondary);
    transition: transform 0.2s ease;
}

details.flow-block[open] .flow-chevron {
    transform: rotate(180deg);
}

/* Während der Zuklapp-Animation bleibt [open] noch gesetzt — Chevron
   trotzdem sofort zurückdrehen (Klasse setzt flow-diagram.js). */
details.flow-block.closing .flow-chevron {
    transform: rotate(0deg);
}

details.flow-block .flow-diagram {
    padding: 0.5rem 1rem 1.25rem;
}

/* Expanded page (technik.html) */
.flow-page {
    min-height: 100vh;
}

.flow-block-expanded {
    margin-bottom: 3.5rem;
}

.flow-block-expanded h3 {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.6rem;
}

.flow-back {
    margin-bottom: 1.5rem;
}

.flow-back a,
.flow-all-link a {
    color: var(--text-secondary);
    text-decoration: none;
    border-bottom: 1px dotted currentColor;
}

.flow-back a:hover,
.flow-all-link a:hover {
    color: var(--text-primary);
}

.flow-all-link {
    text-align: center;
    margin-top: 2rem;
}

/* Hero extras */
.hero-actions {
    display: flex;
    gap: 0.9rem;
    justify-content: center;
    flex-wrap: wrap;
}

.cta-secondary {
    background: transparent !important;
    border: 2px solid currentColor;
}

.hero-platforms {
    margin-top: 1rem;
    font-size: 0.9rem;
    opacity: 0.75;
}

.hero-disclaimer {
    margin-top: 0.9rem;
    max-width: 560px;
    margin-left: auto;
    margin-right: auto;
    font-size: 0.8rem;
    line-height: 1.5;
    opacity: 0.6;
}

/* Feature icons as SVG */
.feature-icon svg {
    display: block;
    margin: 0 auto;
}

/* ── Diagramm im Vollbild ──────────────────────────────────────────────────
   Gegenstück zu cms/web/assets/css/site.css — beide Seiten zeigen dieselben
   Diagramme, also verhalten sie sich gleich. Ein Sequenzdiagramm ist ~1500 px
   breit; in eine Handyspalte skaliert ist es nicht mehr lesbar, deshalb
   öffnet ein Tipp es formatfüllend (flow-diagram.js). */
.flow-diagram[data-zoomable="1"]{cursor:zoom-in;}
.flow-diagram[data-zoomable="1"]:focus-visible{outline:2px solid var(--primary-light); outline-offset:4px;}
body.mmd-full-lock{overflow:hidden;}

.mmd-full{position:fixed; inset:0; z-index:2000; display:none; flex-direction:column;
  background:var(--bg-primary);}
.mmd-full.open{display:flex;}
.mmd-full-bar{display:flex; align-items:center; justify-content:space-between; gap:12px;
  padding:10px 14px; background:var(--bg-card); box-shadow:0 1px 4px var(--shadow-color);}
.mmd-full-title{font-size:14px; font-weight:600; color:var(--text-primary);
  overflow:hidden; text-overflow:ellipsis; white-space:nowrap;}
.mmd-full-btns{display:flex; gap:6px; flex:none;}
.mmd-full-btns button{font-size:14px; line-height:1; color:var(--text-primary);
  background:var(--bg-secondary); border:1px solid var(--shadow-color); border-radius:6px;
  padding:8px 12px; cursor:pointer; min-width:40px; min-height:40px;}
.mmd-full-btns button:hover{border-color:var(--primary-light); color:var(--primary-light);}
.mmd-full-btns button:focus-visible{outline:2px solid var(--primary-light); outline-offset:2px;}

/* touch-action:none — sonst greift die Wisch-Geste des Browsers und die
   eigene Zwei-Finger-Zoomlogik bekommt die Ereignisse nie zu sehen. */
.mmd-full-stage{flex:1; overflow:hidden; position:relative; touch-action:none; cursor:grab;}
.mmd-full-stage:active{cursor:grabbing;}
.mmd-full-inner{position:absolute; inset:0; display:flex; align-items:center;
  justify-content:center; transform-origin:center center;}
.mmd-full-inner svg{max-width:none !important; width:auto; height:auto;}
.mmd-full-hint{padding:8px 14px; text-align:center; font-size:12px;
  color:var(--text-secondary); background:var(--bg-card);}

@media (max-width:560px){
  .mmd-full-title{display:none;}
  .mmd-full-btns{width:100%; justify-content:space-between;}
}