:root {
    --bg-color: #0b1220;
    --bg-color-alt: #0f172a;
    --card-bg: #1e293b;
    --card-bg-alt: #182234;
    --text-color: #f8fafc;
    --text-muted: #94a3b8;
    --accent-color: #38bdf8;
    --accent-hover: #0284c7;
    --accent-soft: rgba(56, 189, 248, 0.12);
    --danger-color: #ef4444;
    --danger-hover: #dc2626;
    --success-color: #22c55e;
    --success-hover: #16a34a;
    --border-color: #2a3752;
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.25);
    --shadow-md: 0 10px 25px rgba(0, 0, 0, 0.45);
    --sidebar-width: 300px;
    --topbar-height: 64px;
}

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

html, body {
    height: 100%;
}

body {
    font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background-color: var(--bg-color);
    background-image: radial-gradient(circle at 15% -10%, rgba(56, 189, 248, 0.08), transparent 45%);
    color: var(--text-color);
    min-height: 100vh;
}

h1, h2, h3 {
    line-height: 1.25;
}

p {
    color: var(--text-muted);
}

/* ============================================================================
   Landingpage (Auth-View)
   ============================================================================ */
.auth-view {
    min-height: 100vh;
    display: grid;
    place-items: center;
    padding: 2rem 1.5rem;
}

.auth-layout {
    width: 100%;
    max-width: 1080px;
    display: grid;
    grid-template-columns: 1.1fr 0.9fr;
    gap: 3.5rem;
    align-items: center;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    background-color: var(--accent-soft);
    color: var(--accent-color);
    font-size: 0.8rem;
    font-weight: 600;
    padding: 0.35rem 0.75rem;
    border-radius: 999px;
    margin-bottom: 1.25rem;
}

.hero h1 {
    font-size: 2.4rem;
    font-weight: 800;
    letter-spacing: -0.02em;
    margin-bottom: 1rem;
}

.hero-sub {
    font-size: 1.05rem;
    max-width: 34rem;
    margin-bottom: 2rem;
}

.hero-features {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 1.1rem;
}

.hero-features li {
    display: flex;
    align-items: flex-start;
    gap: 0.9rem;
}

.hero-feature-icon {
    font-size: 1.3rem;
    line-height: 1;
    flex-shrink: 0;
}

.hero-features strong {
    display: block;
    font-size: 0.95rem;
    margin-bottom: 0.15rem;
}

.hero-features span {
    font-size: 0.88rem;
    color: var(--text-muted);
}

.auth-card-wrap {
    display: flex;
    justify-content: center;
}

.auth-card {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    padding: 2.25rem;
    width: 100%;
    max-width: 380px;
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
}

.auth-card h2 {
    font-size: 1.4rem;
}

.auth-form {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.auth-switch {
    text-align: center;
    font-size: 0.9rem;
    color: var(--text-muted);
}

.link-btn {
    background: none;
    border: none;
    color: var(--accent-color);
    cursor: pointer;
    font-size: 0.9rem;
    text-decoration: underline;
    padding: 0;
    margin-left: 0.25rem;
}

@media (max-width: 860px) {
    .auth-layout {
        grid-template-columns: 1fr;
        gap: 2.5rem;
        text-align: center;
    }
    .hero-features { text-align: left; }
    .hero-sub { margin-left: auto; margin-right: auto; }
}

/* ============================================================================
   App-Shell: Top-Bar + Sidebar + Main-Panel
   ============================================================================ */
.app-shell {
    display: flex;
    flex-direction: column;
    height: 100vh;
}

.topbar {
    height: var(--topbar-height);
    flex-shrink: 0;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 1.5rem;
    border-bottom: 1px solid var(--border-color);
    background-color: var(--bg-color-alt);
}

.topbar-brand {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-weight: 700;
    font-size: 1.05rem;
}

.topbar-brand-icon {
    font-size: 1.2rem;
}

.topbar-controls {
    display: flex;
    align-items: center;
    gap: 0.9rem;
}

.app-body {
    flex: 1;
    display: flex;
    min-height: 0;
}

.sidebar {
    width: var(--sidebar-width);
    flex-shrink: 0;
    border-right: 1px solid var(--border-color);
    background-color: var(--bg-color-alt);
    padding: 1.25rem;
    overflow-y: auto;
}

.sidebar-form {
    margin-bottom: 0;
}

.main-panel {
    flex: 1;
    min-width: 0;
    overflow-y: auto;
    padding: 2rem;
}

/* Empty State */
.empty-state {
    height: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    color: var(--text-muted);
    gap: 0.4rem;
}

.empty-state-icon {
    font-size: 2.4rem;
    margin-bottom: 0.5rem;
    opacity: 0.8;
}

.empty-state h2 {
    color: var(--text-color);
    font-size: 1.2rem;
}

/* Project Detail Panel */
.project-detail {
    max-width: 900px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.project-detail-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 1rem;
    flex-wrap: wrap;
}

.project-detail-header h2 {
    font-size: 1.5rem;
    word-break: break-word;
}

.project-detail-header-right {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    flex-shrink: 0;
}

.project-summary-card {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 0.75rem 1.1rem;
    text-align: right;
    flex-shrink: 0;
}

.project-summary-label {
    display: block;
    font-size: 0.75rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.04em;
}

.project-summary-value-row {
    display: flex;
    align-items: baseline;
    gap: 0.3rem;
    justify-content: flex-end;
}

.project-summary-value-row #modal-total-hours {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--accent-color);
}

.project-summary-unit {
    font-size: 0.8rem;
    color: var(--text-muted);
}

.detail-grid {
    display: grid;
    grid-template-columns: minmax(260px, 340px) 1fr;
    gap: 1.5rem;
    align-items: start;
}

@media (max-width: 900px) {
    .detail-grid {
        grid-template-columns: 1fr;
    }
}

.card {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 1.25rem;
}

/* ============================================================================
   Forms & Inputs
   ============================================================================ */
.project-form,
#quick-timer-form {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.project-form {
    flex-direction: row;
    margin-bottom: 1rem;
}

.management-controls {
    margin-bottom: 1.25rem;
}

.time-inputs {
    display: flex;
    gap: 1rem;
}

.input-group {
    display: flex;
    flex-direction: column;
    flex: 1;
    gap: 0.25rem;
}

.input-group label {
    font-size: 0.85rem;
    color: var(--text-muted);
}

input[type="text"],
input[type="email"],
input[type="password"],
input[type="datetime-local"],
select {
    padding: 0.6rem 0.8rem;
    border-radius: var(--radius-sm);
    border: 1px solid var(--border-color);
    background-color: var(--bg-color-alt);
    color: var(--text-color);
    font-size: 0.95rem;
    width: 100%;
}

input:focus,
select:focus {
    outline: 2px solid var(--accent-color);
    outline-offset: 1px;
}

.inline-edit-input {
    flex: 1;
    margin-right: 0.5rem;
}

/* ============================================================================
   Buttons
   ============================================================================ */
.btn {
    padding: 0.5rem 0.85rem;
    border: none;
    border-radius: var(--radius-sm);
    font-size: 0.85rem;
    font-weight: 600;
    cursor: pointer;
    transition: background-color 0.15s ease, transform 0.05s ease;
    white-space: nowrap;
}

.btn:active {
    transform: scale(0.97);
}

.btn-block {
    width: 100%;
}

.btn.primary {
    background-color: var(--accent-color);
    color: #04121f;
}

.btn.primary:hover {
    background-color: var(--accent-hover);
    color: #ffffff;
}

.btn.success {
    background-color: var(--success-color);
    color: #ffffff;
}

.btn.success:hover {
    background-color: var(--success-hover);
}

.btn.secondary {
    background-color: var(--card-bg-alt);
    color: var(--text-color);
    border: 1px solid var(--border-color);
}

.btn.secondary:hover {
    background-color: var(--border-color);
}

.btn.danger {
    background-color: var(--danger-color);
    color: #ffffff;
}

.btn.danger:hover {
    background-color: var(--danger-hover);
}

/* Root Drop Zone */
.root-drop-zone {
    border: 2px dashed var(--border-color);
    border-radius: var(--radius-md);
    padding: 1rem;
    text-align: center;
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-bottom: 1rem;
    transition: border-color 0.2s ease, background-color 0.2s ease;
}

.root-drop-zone.drag-over {
    border-color: var(--accent-color);
    background-color: var(--accent-soft);
}

/* ============================================================================
   Tree & Lists Layout
   ============================================================================ */
.project-tree,
.subprojects-list,
.time-log-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 0.4rem;
    width: 100%;
}

.subprojects-list {
    margin-top: 0.4rem;
    padding-left: 1rem;
    border-left: 2px solid var(--border-color);
}

.project-item {
    background: transparent;
    border: none;
    padding: 0;
    width: 100%;
}

.project-item.drag-over > .project-header {
    border-color: var(--accent-color);
}

.project-item.dragging {
    opacity: 0.5;
}

.project-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 0.6rem;
    background-color: var(--card-bg);
    padding: 0.55rem 0.75rem;
    border-radius: var(--radius-sm);
    border: 1px solid var(--border-color);
    width: 100%;
    cursor: pointer;
    transition: border-color 0.15s ease, background-color 0.15s ease;
}

.project-header:hover {
    border-color: var(--accent-color);
}

.project-header.selected {
    border-color: var(--accent-color);
    background-color: var(--accent-soft);
}

.project-title {
    font-size: 0.9rem;
    word-break: break-word;
    flex: 1;
}

.actions {
    display: flex;
    gap: 0.35rem;
    flex-shrink: 0;
}

/* Time Log Items & Edit Form */
.time-log-item {
    background-color: var(--card-bg-alt);
    padding: 0.75rem 1rem;
    border-radius: var(--radius-sm);
    border: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 1rem;
    flex-wrap: wrap;
}

.time-log-details {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
    flex: 1;
    min-width: 180px;
}

.time-log-project {
    font-weight: 600;
    color: var(--accent-color);
}

.time-log-times {
    font-size: 0.85rem;
    color: var(--text-muted);
}

.time-log-duration {
    font-size: 1.1rem;
    font-weight: 700;
    margin-right: 0.5rem;
}

.time-log-edit-form {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    width: 100%;
}

/* ============================================================================
   Modal Styles (Types-Verwaltung, Timer-Typ-Auswahl)
   ============================================================================ */
.modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(2px);
    place-items: center;
}

.modal.active {
    display: grid;
}

.modal-content {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    width: 90%;
    max-width: 600px;
    max-height: 85vh;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    box-shadow: var(--shadow-md);
}

.modal-content.small {
    max-width: 400px;
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 1.5rem;
    border-bottom: 1px solid var(--border-color);
}

.close-btn {
    background: none;
    border: none;
    color: var(--text-muted);
    font-size: 1.5rem;
    cursor: pointer;
    line-height: 1;
}

.close-btn:hover {
    color: var(--text-color);
}

.modal-body {
    padding: 1.5rem;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
}

/* Modal Form Styles */
.modal-time-form {
    display: flex;
    flex-direction: column;
    gap: 0.85rem;
}

.modal-time-form h3 {
    font-size: 1rem;
    color: var(--accent-color);
    margin-bottom: 0.1rem;
}

.time-log-panel {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    min-height: 200px;
}

.modal-controls {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1rem;
}

/* Toggle Switch Styles */
.toggle-group {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 0.9rem;
    color: var(--text-muted);
}

.switch {
    position: relative;
    display: inline-block;
    width: 42px;
    height: 23px;
    flex-shrink: 0;
}

.switch input {
    opacity: 0;
    width: 0;
    height: 0;
}

.slider {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: var(--border-color);
    transition: .3s;
    border-radius: 24px;
}

.slider:before {
    position: absolute;
    content: "";
    height: 17px;
    width: 17px;
    left: 3px;
    bottom: 3px;
    background-color: white;
    transition: .3s;
    border-radius: 50%;
}

input:checked + .slider {
    background-color: var(--accent-color);
}

input:checked + .slider:before {
    transform: translateX(19px);
}

.mode-switcher {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    background-color: var(--card-bg);
    padding: 0.35rem 0.7rem;
    border-radius: 999px;
    border: 1px solid var(--border-color);
}

.mode-label {
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--accent-color);
    white-space: nowrap;
}

/* ============================================================================
   Toast Notifications (ersetzen alert())
   ============================================================================ */
#toast-container {
    position: fixed;
    top: 1.25rem;
    right: 1.25rem;
    z-index: 2000;
    display: flex;
    flex-direction: column;
    gap: 0.6rem;
    max-width: 360px;
}

.toast {
    padding: 0.8rem 1rem;
    border-radius: var(--radius-sm);
    font-size: 0.9rem;
    box-shadow: var(--shadow-sm);
    cursor: pointer;
    animation: toast-in 0.2s ease-out;
    border: 1px solid var(--border-color);
}

.toast.error {
    background-color: var(--danger-color);
    color: #ffffff;
    border-color: var(--danger-hover);
}

.toast.success {
    background-color: var(--success-color);
    color: #ffffff;
    border-color: var(--success-hover);
}

@keyframes toast-in {
    from { opacity: 0; transform: translateY(-8px); }
    to { opacity: 1; transform: translateY(0); }
}

.user-email {
    font-size: 0.85rem;
    color: var(--text-muted);
}

/* ============================================================================
   Responsive: Sidebar wird auf kleinen Screens zur oberen Leiste
   ============================================================================ */
@media (max-width: 760px) {
    .app-body {
        flex-direction: column;
    }
    .sidebar {
        width: 100%;
        max-height: 40vh;
        border-right: none;
        border-bottom: 1px solid var(--border-color);
    }
    .topbar {
        flex-wrap: wrap;
        height: auto;
        padding: 0.75rem 1rem;
        gap: 0.5rem;
    }
    .topbar-controls {
        flex-wrap: wrap;
    }
    .main-panel {
        padding: 1.25rem;
    }
}