/* ============================================
   Habit Tracker – Dark Theme Global Styles
   ============================================ */

:root {
    /* Light Theme – hell mit dunklem Akzent */
    --bg-primary: #f5f5f7;       /* Haupt-Hintergrund (sehr helles Grau) */
    --bg-secondary: #ffffff;     /* Sidebar/Topnav-Hintergrund */
    --bg-card: #ffffff;          /* Karten weiß */
    --bg-input: #f0f0f5;         /* Inputs leicht abgesetzt */
    --bg-hover: #ebebf0;         /* Hover-State */
    --accent: #082a47;           /* deep – dunkles Marineblau */
    --accent-light: #d6e9fb;     /* sehr helles Aqua */
    --primary: #1163a8;          /* habit24 teal – Hauptakzent (Buttons, Links) */
    --primary-hover: #0d4f87;    /* dunklerer Teal für Hover */
    --primary-light: rgba(63, 159, 232, 0.12);  /* aqua tint */
    --success: #1abc54;          /* etwas dunkler für Kontrast auf weiß */
    --success-bg: rgba(26, 188, 84, 0.12);
    --warning: #e69500;          /* dunkler */
    --warning-hover: #c47e00;
    --warning-bg: rgba(230, 149, 0, 0.12);
    --danger: #e63342;
    --danger-bg: rgba(230, 51, 66, 0.10);
    --text-primary: #1a1a2e;     /* Dunkles Blau-Schwarz */
    --text-secondary: #4a5568;
    --text-muted: #8898a8;
    --border: #e2e8f0;           /* Helles Grau */
    --shadow: 0 1px 3px rgba(0,0,0,0.06), 0 1px 2px rgba(0,0,0,0.04);
    --shadow-lg: 0 4px 16px rgba(0,0,0,0.08), 0 2px 6px rgba(0,0,0,0.05);
    --radius: 12px;
    --radius-sm: 8px;
    --radius-xs: 4px;
    --sidebar-width: 260px;
    --topnav-height: 60px;
    --transition: all 0.2s ease;
}

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

html, body {
    height: 100%;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow: hidden;
}

a { color: var(--primary); text-decoration: none; }
a:hover { color: var(--primary-hover); }

/* === App Shell === */
.app-shell {
    display: flex;
    height: 100vh;
    width: 100vw;
}

.loading-screen {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 100vh;
    background: var(--bg-primary);
    color: var(--primary);
    font-size: 1.2rem;
    font-weight: 600;
}
.loading-screen p { margin-top: 16px; }
.loading-spinner {
    width: 40px; height: 40px;
    border: 3px solid var(--border);
    border-top-color: var(--primary);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

.hidden { display: none !important; }

/* === Top Navigation === */
.top-nav {
    display: none;
    position: fixed;
    top: 0; left: 0; right: 0;
    /* iOS Safe-Area-Inset: schiebt Top-Nav unter Statusbar/Dynamic Island */
    padding-top: env(safe-area-inset-top, 0);
    padding-left: calc(env(safe-area-inset-left, 0) + 16px);
    padding-right: calc(env(safe-area-inset-right, 0) + 16px);
    height: calc(var(--topnav-height) + env(safe-area-inset-top, 0));
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border);
    align-items: center;
    justify-content: space-between;
    z-index: 100;
    box-sizing: border-box;
}

.page-title {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-primary);
}

.icon-btn {
    background: none;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    padding: 8px;
    border-radius: var(--radius-sm);
    transition: var(--transition);
}
.icon-btn:hover { background: var(--bg-hover); color: var(--text-primary); }

/* === Sidebar === */
.sidebar {
    width: var(--sidebar-width);
    background: var(--bg-secondary);
    border-right: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    flex-shrink: 0;
    overflow-y: auto;
    z-index: 200;
}

.sidebar-header {
    padding: 24px 20px;
    display: flex;
    align-items: center;
    gap: 12px;
    border-bottom: 1px solid var(--border);
}
.sidebar-logo {
    width: 36px; height: 36px;
    background: var(--primary);
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 800;
    font-size: 0.9rem;
    color: #fff;
}
.sidebar-title {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--text-primary);
}

.sidebar-user {
    padding: 16px 20px;
    display: flex;
    align-items: center;
    gap: 12px;
    border-bottom: 1px solid var(--border);
    cursor: pointer;
}
.user-avatar {
    width: 40px; height: 40px;
    border-radius: 50%;
    background: var(--accent);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    font-size: 1rem;
    color: #fff;
    flex-shrink: 0;
}
.user-info {
    display: flex;
    flex-direction: column;
}
.user-name { font-weight: 600; font-size: 0.95rem; }
.user-role { font-size: 0.8rem; color: var(--text-muted); }

.sidebar-nav {
    list-style: none;
    padding: 12px 0;
    flex: 1;
}
.nav-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 20px;
    color: var(--text-secondary);
    transition: var(--transition);
    font-size: 0.95rem;
    border-left: 3px solid transparent;
}
.nav-item:hover {
    background: var(--bg-hover);
    color: var(--text-primary);
}
.nav-item.active {
    background: var(--primary-light);
    color: var(--primary);
    border-left-color: var(--primary);
}

.sidebar-footer {
    padding: 12px 0;
    border-top: 1px solid var(--border);
}
.logout-btn { color: var(--text-muted); }
.logout-btn:hover { background: var(--danger-bg); color: var(--danger); }
.app-version {
    padding: 10px 20px 4px;
    color: var(--text-muted);
    font-size: 0.72rem;
    font-variant-numeric: tabular-nums;
    letter-spacing: 0.02em;
    text-align: center;
    opacity: 0.7;
    user-select: text;
}

/* === Update-Banner (Sticky-Bar unten) === */
.update-banner {
    position: fixed;
    left: 16px; right: 16px; bottom: 16px;
    /* iOS Safe-Area-Inset für Home-Indicator */
    bottom: max(16px, env(safe-area-inset-bottom, 0));
    background: var(--bg-card);
    border: 1px solid var(--primary);
    border-radius: var(--radius);
    box-shadow: var(--shadow-lg);
    padding: 14px 18px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    z-index: 9999;
    animation: slideUp 0.35s ease;
    max-width: 600px;
    margin: 0 auto;
}
@keyframes slideUp {
    from { transform: translateY(100%); opacity: 0; }
    to { transform: translateY(0); opacity: 1; }
}
.update-banner-text {
    display: flex;
    flex-direction: column;
    gap: 2px;
    flex: 1;
    min-width: 0;
}
.update-banner-text strong {
    color: var(--text-primary);
    font-size: 0.95rem;
}
.update-banner-text span {
    color: var(--text-secondary);
    font-size: 0.82rem;
}
.update-banner-actions {
    display: flex;
    gap: 8px;
    flex-shrink: 0;
}
.update-banner-now,
.update-banner-later {
    border: none;
    border-radius: var(--radius-sm);
    padding: 9px 14px;
    font-size: 0.88rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.15s;
}
.update-banner-now {
    background: var(--primary);
    color: #fff;
}
.update-banner-now:hover { background: var(--primary-hover); }
.update-banner-now:disabled { opacity: 0.6; cursor: default; }
.update-banner-later {
    background: transparent;
    color: var(--text-muted);
    border: 1px solid var(--border);
}
.update-banner-later:hover { background: var(--bg-hover); color: var(--text-primary); }

@media (max-width: 500px) {
    .update-banner {
        flex-direction: column;
        align-items: stretch;
        gap: 12px;
    }
    .update-banner-actions { justify-content: flex-end; }
}

/* === Main Content === */
.main-content {
    flex: 1;
    overflow-y: auto;
    padding: 24px;
    /* Extra unten — Safe-Area + Atmungsraum unter letzten Button */
    padding-bottom: calc(48px + env(safe-area-inset-bottom, 0));
    background: var(--bg-primary);
}

.sidebar-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,0.5);
    z-index: 150;
}

/* === Page Container === */
.page-container {
    max-width: 900px;
    margin: 0 auto;
}
.page-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 24px;
}
.page-header h2 {
    font-size: 1.5rem;
    font-weight: 700;
}

/* === Buttons === */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 20px;
    border: none;
    border-radius: var(--radius-sm);
    font-size: 0.95rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    text-decoration: none;
}
.btn-primary {
    background: var(--primary);
    color: #fff;
}
.btn-primary:hover { background: var(--primary-hover); }
.btn-secondary {
    background: var(--accent);
    color: #fff;
}
.btn-secondary:hover { background: var(--accent-light); }
.btn-outline {
    background: transparent;
    border: 1px solid var(--border);
    color: var(--text-primary);
}
.btn-outline:hover { background: var(--bg-hover); }
.btn-danger {
    background: var(--danger);
    color: #fff;
}
.btn-danger:hover { opacity: 0.9; }
.btn-sm { padding: 6px 12px; font-size: 0.85rem; }
.btn-icon {
    padding: 8px;
    border-radius: 50%;
    width: 36px; height: 36px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

/* === Cards === */
.card {
    background: var(--bg-card);
    border-radius: var(--radius);
    padding: 20px;
    box-shadow: var(--shadow);
    border: 1px solid var(--border);
}
.card-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 16px;
}
.card-title {
    font-size: 1rem;
    font-weight: 600;
}

/* === Form === */
.form-group {
    margin-bottom: 16px;
}
.form-label {
    display: block;
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--text-secondary);
    margin-bottom: 6px;
}
.form-input, .form-select, .form-textarea {
    width: 100%;
    padding: 10px 14px;
    background: var(--bg-input);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    font-size: 0.95rem;
    transition: var(--transition);
    font-family: inherit;
}
.form-input:focus, .form-select:focus, .form-textarea:focus {
    outline: none;
    border-color: var(--accent-light);
    box-shadow: 0 0 0 3px rgba(15, 52, 96, 0.3);
}
.form-input::placeholder { color: var(--text-muted); }
.form-textarea { min-height: 100px; resize: vertical; }
.form-select {
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%23a0a0b0' stroke-width='2'%3E%3Cpolyline points='6 9 12 15 18 9'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 12px center;
    padding-right: 36px;
}
.form-checkbox {
    display: flex;
    align-items: center;
    gap: 8px;
    cursor: pointer;
}
.form-checkbox input[type="checkbox"] {
    width: 18px; height: 18px;
    accent-color: var(--primary);
}
.form-error {
    color: var(--danger);
    font-size: 0.85rem;
    margin-top: 4px;
}
.form-hint {
    color: var(--text-muted);
    font-size: 0.8rem;
    margin-top: 4px;
}

/* === Badge === */
.badge {
    display: inline-flex;
    align-items: center;
    padding: 2px 10px;
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: 600;
}
.badge-success { background: var(--success-bg); color: var(--success); }
.badge-warning { background: var(--warning-bg); color: var(--warning); }
.badge-danger { background: var(--danger-bg); color: var(--danger); }
.badge-info { background: rgba(15, 52, 96, 0.3); color: var(--accent-light); }

/* === Toast === */
.toast-container {
    position: fixed;
    bottom: 24px;
    right: 24px;
    z-index: 9999;
    display: flex;
    flex-direction: column;
    gap: 8px;
}
.toast {
    padding: 14px 20px;
    border-radius: var(--radius-sm);
    background: var(--bg-card);
    border: 1px solid var(--border);
    box-shadow: var(--shadow-lg);
    color: var(--text-primary);
    font-size: 0.9rem;
    animation: slideIn 0.3s ease;
    max-width: 400px;
}
.toast-success { border-left: 3px solid var(--success); }
.toast-error { border-left: 3px solid var(--danger); }
.toast-warning { border-left: 3px solid var(--warning); }
@keyframes slideIn {
    from { transform: translateX(100%); opacity: 0; }
    to { transform: translateX(0); opacity: 1; }
}

/* === Modal === */
.modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,0.6);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    padding: 20px;
}
.modal {
    background: var(--bg-secondary);
    border-radius: var(--radius);
    width: 100%;
    max-width: 500px;
    max-height: 90vh;
    max-height: 88dvh; /* berücksichtigt iOS-Toolbars dynamisch */
    overflow-y: auto;
    box-shadow: var(--shadow-lg);
    animation: modalIn 0.2s ease;
}
@keyframes modalIn {
    from { transform: scale(0.95); opacity: 0; }
    to { transform: scale(1); opacity: 1; }
}
.modal-header {
    padding: 20px 24px 0;
    display: flex;
    align-items: center;
    justify-content: space-between;
}
.modal-header h3 { font-size: 1.2rem; }
.modal-body { padding: 20px 24px; }
.modal-footer {
    padding: 0 24px 20px;
    /* Safe-Area für iOS Home-Indicator + extra Atmungsraum */
    padding-bottom: calc(28px + env(safe-area-inset-bottom, 0));
    display: flex;
    justify-content: flex-end;
    gap: 8px;
}

/* === Empty State === */
.empty-state {
    text-align: center;
    padding: 60px 20px;
    color: var(--text-muted);
}
.empty-state svg { margin-bottom: 16px; opacity: 0.3; }
.empty-state h3 { color: var(--text-secondary); margin-bottom: 8px; }
.empty-state p { font-size: 0.9rem; }

/* === Responsive === */
@media (max-width: 768px) {
    .sidebar {
        position: fixed;
        left: -100%;
        top: 0;
        bottom: 0;
        transition: left 0.3s ease;
        width: 280px;
    }
    .sidebar.open { left: 0; }
    .sidebar-overlay.open { display: block; }
    .top-nav { display: flex; }
    .main-content {
        padding: 16px;
        /* Top-Nav-Höhe + Safe-Area + 16px Abstand */
        padding-top: calc(var(--topnav-height) + env(safe-area-inset-top, 0) + 16px);
        /* Unten extra Platz + Safe-Area Home-Indicator */
        padding-bottom: calc(56px + env(safe-area-inset-bottom, 0));
    }
    .page-header h2 { font-size: 1.2rem; }
    .hidden-mobile { display: none !important; }
}

@media (min-width: 769px) {
    .top-nav { display: none; }
    .main-content { padding: 32px; }
}

/* === Scrollbar === */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--text-muted); }