:root {
    --primary: #00d1b2;
    --primary-dark: #00b89d;
    --dark: #0f172a;
    --darker: #0b111e;
    --text: #f8fafc;
    --text-muted: #94a3b8;
    --panel: #1e293b;
    --border: #334155;
}

* {
    box-sizing: border-box;
}

body {
    font-family: 'Segoe UI', system-ui, sans-serif;
    background-color: var(--dark);
    color: var(--text);
    margin: 0;
    padding: 0;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

a {
    color: inherit;
}

/* —— Top-Leiste —— */
.site-header {
    background-color: var(--darker);
    border-bottom: 1px solid var(--border);
    padding: 14px 0;
}

.site-header .container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 16px;
}

.logo {
    font-size: 20px;
    font-weight: bold;
    color: var(--primary);
    text-decoration: none;
    white-space: nowrap;
}

.top-nav {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 4px 16px;
}

.top-nav a {
    color: var(--text);
    text-decoration: none;
    font-weight: 500;
    font-size: 14px;
}

.top-nav a:hover {
    color: var(--primary);
}

.btn-login {
    background: var(--primary) !important;
    color: var(--dark) !important;
    padding: 8px 14px;
    border-radius: 6px;
    font-weight: 700;
}

/* —— Sub-Navigation —— */
.subnav {
    background: linear-gradient(180deg, #162032 0%, var(--panel) 100%);
    border-bottom: 1px solid var(--border);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.2);
}

.subnav-inner {
    max-width: 1100px;
    margin: 0 auto;
    padding: 12px 20px 0;
}

.subnav-tabs {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    list-style: none;
    margin: 0;
    padding: 0;
}

.subnav-tabs a {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 12px 20px;
    border-radius: 10px 10px 0 0;
    text-decoration: none;
    font-weight: 600;
    font-size: 14px;
    color: var(--text-muted);
    border: 1px solid transparent;
    border-bottom: none;
    transition: background 0.2s, color 0.2s;
}

.subnav-tabs a:hover {
    color: var(--text);
    background: rgba(0, 209, 178, 0.08);
}

.subnav-tabs a.is-active {
    color: var(--dark);
    background: var(--primary);
    border-color: var(--primary);
}

.subnav-tabs .tab-icon {
    font-size: 16px;
}

.subnav-meta {
    padding: 10px 0 14px;
    font-size: 13px;
    color: var(--text-muted);
}

.subnav-meta strong {
    color: var(--text);
}

/* —— Inhalt —— */
.site-main {
    flex: 1;
}

.page-wrap {
    max-width: 1100px;
    margin: 0 auto;
    padding: 32px 20px 48px;
}

.page-head {
    margin-bottom: 28px;
}

.page-head h1 {
    margin: 0 0 8px;
    font-size: clamp(26px, 3.5vw, 34px);
}

.page-head p {
    margin: 0;
    color: var(--text-muted);
    font-size: 16px;
}

/* Home */
.features {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 24px;
}

.feature-card {
    background: var(--panel);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 32px 28px;
    text-align: center;
    transition: border-color 0.2s, transform 0.2s;
}

.feature-card:hover {
    border-color: var(--primary);
    transform: translateY(-2px);
}

.feature-card h2 {
    margin: 0 0 10px;
    font-size: 1.15rem;
}

.feature-card p {
    color: var(--text-muted);
    margin: 0 0 16px;
    font-size: 15px;
}

.feature-icon {
    font-size: 44px;
    display: block;
    margin-bottom: 16px;
}

.feature-link {
    display: inline-block;
    color: var(--primary);
    text-decoration: none;
    font-size: 14px;
    font-weight: 600;
}

.feature-link:hover {
    text-decoration: underline;
}

/* Vorschau */
.preview-panel {
    background: var(--panel);
    border: 1px solid var(--border);
    border-radius: 12px;
    overflow: hidden;
}

.preview-toolbar {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    align-items: center;
    padding: 12px 16px;
    background: var(--darker);
    border-bottom: 1px solid var(--border);
}

.preview-toolbar .toolbar-label {
    color: var(--text-muted);
    font-size: 11px;
    text-transform: uppercase;
    letter-spacing: 0.06em;
}

.preview-toolbar .toolbar-sep {
    color: var(--border);
    margin: 0 4px;
}

.preview-btn {
    border: 1px solid var(--border);
    background: var(--panel);
    color: var(--text);
    padding: 6px 12px;
    border-radius: 6px;
    font-size: 13px;
    cursor: pointer;
    font-family: inherit;
}

.preview-btn:hover {
    border-color: var(--primary);
    color: var(--primary);
}

.preview-btn.active {
    background: var(--primary);
    border-color: var(--primary);
    color: var(--dark);
    font-weight: 600;
}

.preview-frame-wrap {
    background: #0b111e;
    padding: 20px;
    min-height: 380px;
    display: flex;
    justify-content: center;
}

.preview-frame-inner {
    width: 100%;
    max-width: 100%;
    background: #fff;
    border-radius: 8px;
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.35);
    overflow: hidden;
    transition: max-width 0.25s ease;
    color: #1e293b;
}

.preview-frame-inner.size-tablet { max-width: 768px; }
.preview-frame-inner.size-mobile { max-width: 390px; }

.preview-mock-screen {
    display: none;
    min-height: 360px;
    font-size: 14px;
}

.preview-mock-screen.active {
    display: block;
}

.preview-mock-header {
    background: #f1f5f9;
    padding: 12px 16px;
    border-bottom: 1px solid #e2e8f0;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.preview-mock-header strong {
    color: #0f172a;
}

.preview-mock-body {
    padding: 20px 16px;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
    gap: 12px;
}

.preview-mock-card {
    background: #f8fafc;
    border: 1px solid #e2e8f0;
    border-radius: 6px;
    padding: 16px;
    text-align: center;
}

.preview-mock-card span {
    font-size: 28px;
    display: block;
    margin-bottom: 8px;
}

.preview-mock-list {
    padding: 16px;
}

.preview-mock-list-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px 14px;
    background: #f8fafc;
    border: 1px solid #e2e8f0;
    border-radius: 6px;
    margin-bottom: 8px;
}

.preview-mock-list-item .badge {
    font-size: 11px;
    background: #00d1b2;
    color: #0f172a;
    padding: 3px 8px;
    border-radius: 4px;
    font-weight: 600;
}

.preview-mock-settings {
    padding: 20px 16px;
}

.preview-mock-settings label {
    display: block;
    font-size: 12px;
    color: #64748b;
    margin-bottom: 4px;
}

.preview-mock-settings .field {
    background: #f8fafc;
    border: 1px solid #e2e8f0;
    border-radius: 6px;
    padding: 10px 12px;
    margin-bottom: 14px;
    color: #334155;
}

.preview-status {
    padding: 8px 16px 12px;
    font-size: 12px;
    color: var(--text-muted);
    border-top: 1px solid var(--border);
    background: var(--darker);
    margin: 0;
}

/* Starten / Formular */
.form-panel {
    max-width: 520px;
    margin: 0 auto;
    background: var(--panel);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 36px 32px;
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    margin-bottom: 6px;
    color: var(--text-muted);
    font-size: 14px;
}

.form-group input {
    width: 100%;
    padding: 12px;
    background: var(--dark);
    border: 1px solid var(--border);
    border-radius: 8px;
    color: #fff;
    font-size: 15px;
}

.submit-btn {
    width: 100%;
    border: 0;
    border-radius: 8px;
    padding: 14px;
    background: var(--primary);
    color: var(--dark);
    font-weight: 700;
    font-size: 15px;
    cursor: pointer;
}

.submit-btn:hover {
    background: var(--primary-dark);
}

.alert {
    padding: 14px;
    border-radius: 8px;
    margin-bottom: 20px;
    font-size: 14px;
}

.alert.error {
    background: rgba(248, 113, 113, 0.12);
    border: 1px solid #f87171;
    color: #fecaca;
}

/* Footer */
.site-footer {
    text-align: center;
    padding: 36px 20px;
    border-top: 1px solid var(--border);
    color: var(--text-muted);
    font-size: 14px;
}

.footer-links {
    list-style: none;
    padding: 0;
    margin: 12px 0 0;
}

.footer-links li {
    display: inline-block;
    margin: 0 10px;
}

.footer-links a {
    color: var(--text-muted);
    text-decoration: none;
}

.footer-links a:hover {
    color: var(--primary);
}

@media (max-width: 640px) {
    .top-nav {
        justify-content: flex-end;
    }

    .subnav-tabs a {
        padding: 10px 14px;
        font-size: 13px;
    }
}