/* Modern Premium Design System for Mermaid Vault */

:root {
    --bg-main: #0b1220;
    --bg-gradient: radial-gradient(circle at 10% 10%, #1b2338 0%, #0b1220 55%, #070b14 100%);
    --sidebar-bg: rgba(18, 28, 46, 0.78);
    --panel-bg: rgba(18, 28, 46, 0.62);
    --header-bg: rgba(9, 15, 28, 0.82);
    --pane-header-bg: rgba(15, 24, 42, 0.95);
    --pane-header-preview-bg: rgba(236, 240, 246, 0.9);
    --editor-bg: #111b2f;
    --editor-text: #d2d8e6;
    --preview-bg: #f7f8fb;
    --preview-text: #0b1220;
    --mermaid-bg: #f7f8fb;
    --accent: #6c87ff;
    --accent-hover: #5a74f0;
    --text-primary: #f8fafc;
    --text-secondary: #9fb0c5;
    --border: rgba(255, 255, 255, 0.12);
    --danger: #ef4444;
    --success: #22c55e;
    --logo-gradient-start: #7aa2ff;
    --logo-gradient-end: #93c5fd;
    --modal-bg: #121a2b;
    --sidebar-width: 280px;
    --header-height: 70px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

body[data-theme="mist"] {
    --bg-main: #e6ebf2;
    --bg-gradient: radial-gradient(circle at 15% 15%, #f2f5fa 0%, #e6ebf2 55%, #dce3ee 100%);
    --sidebar-bg: rgba(255, 255, 255, 0.82);
    --panel-bg: rgba(255, 255, 255, 0.7);
    --header-bg: rgba(248, 250, 252, 0.85);
    --pane-header-bg: rgba(236, 241, 247, 0.92);
    --pane-header-preview-bg: rgba(245, 247, 251, 0.95);
    --editor-bg: #eef2f7;
    --editor-text: #1f2a44;
    --preview-bg: #ffffff;
    --preview-text: #1b2438;
    --mermaid-bg: #ffffff;
    --accent: #3b82f6;
    --accent-hover: #2563eb;
    --text-primary: #1b2438;
    --text-secondary: #4b5a74;
    --border: rgba(30, 41, 59, 0.12);
    --logo-gradient-start: #2563eb;
    --logo-gradient-end: #60a5fa;
    --modal-bg: #f7f9fc;
}

body[data-theme="dusk"] .preview-pane .pane-header,
body[data-theme="dusk"] .preview-pane .pane-header * {
    color: #7e90ab;
}

body[data-theme="dusk"] .theme-select {
    background: rgba(15, 23, 42, 0.6);
    border: 1px solid rgba(148, 163, 184, 0.4);
    color: #e2e8f0;
}

body[data-theme="dusk"] .preview-actions button {
    background: rgba(15, 23, 42, 0.45);
    border: 1px solid rgba(148, 163, 184, 0.3);
    color: #e2e8f0;
}

body[data-theme="dusk"] .preview-actions button:hover {
    background: rgba(15, 23, 42, 0.65);
}

body[data-theme="linen"] {
    --bg-main: #f2ece4;
    --bg-gradient: radial-gradient(circle at 12% 12%, #f9f3ea 0%, #f2ece4 58%, #e9e0d4 100%);
    --sidebar-bg: rgba(255, 250, 244, 0.88);
    --panel-bg: rgba(255, 250, 244, 0.78);
    --header-bg: rgba(250, 245, 239, 0.9);
    --pane-header-bg: rgba(245, 238, 229, 0.95);
    --pane-header-preview-bg: rgba(251, 247, 242, 0.96);
    --editor-bg: #f7f1e9;
    --editor-text: #332b24;
    --preview-bg: #fffdf9;
    --preview-text: #2b241d;
    --mermaid-bg: #fffdf9;
    --accent: #c77c3a;
    --accent-hover: #b56a2d;
    --text-primary: #2e261f;
    --text-secondary: #5b4d40;
    --border: rgba(74, 59, 45, 0.18);
    --logo-gradient-start: #c77c3a;
    --logo-gradient-end: #e8a15a;
    --modal-bg: #fbf4ea;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Outfit', sans-serif;
}

body {
    background: var(--bg-gradient);
    color: var(--text-primary);
    overflow: hidden;
    height: 100vh;
}

.app-container {
    display: flex;
    height: 100vh;
    animation: fadeIn 0.5s ease-out;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

/* Sidebar Styling */
.sidebar {
    width: var(--sidebar-width);
    background: var(--sidebar-bg);
    backdrop-filter: blur(15px);
    border-right: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    z-index: 50;
}

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

.logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 1.25rem;
    font-weight: 600;
    background: linear-gradient(135deg, var(--logo-gradient-start), var(--logo-gradient-end));
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.logo i {
    font-size: 1.5rem;
    -webkit-text-fill-color: var(--logo-gradient-start);
}

#new-diagram {
    background: var(--border);
    border: none;
    color: var(--text-primary);
    width: 32px;
    height: 32px;
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: var(--transition);
}

#new-diagram:hover {
    background: var(--accent);
    transform: rotate(90deg);
}

.file-list-container {
    flex: 1;
    overflow-y: auto;
    padding: 1rem;
}

.file-list {
    list-style: none;
}

.file-item {
    padding: 0.75rem 1rem;
    border-radius: 12px;
    cursor: pointer;
    margin-bottom: 0.5rem;
    transition: var(--transition);
    display: flex;
    align-items: center;
    gap: 0.75rem;
    color: var(--text-secondary);
    border: 1px solid transparent;
}

.file-item:hover {
    background: rgba(255, 255, 255, 0.05);
    color: var(--text-primary);
}

.file-item.active {
    background: rgba(99, 102, 241, 0.1);
    color: var(--accent);
    border-color: rgba(99, 102, 241, 0.2);
}

.sidebar-footer {
    padding: 1.5rem;
    border-top: 1px solid var(--border);
}

.btn-logout {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.9rem;
    transition: var(--transition);
}

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

/* Main Content Area */
.main-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    min-width: 0;
}

.top-bar {
    height: var(--header-height);
    padding: 0 2rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    position: relative;
    z-index: 5;
    border-bottom: 1px solid var(--border);
    background: linear-gradient(135deg, rgba(255, 255, 255, 0.08), rgba(255, 255, 255, 0)) , var(--header-bg);
    backdrop-filter: blur(10px);
    box-shadow: 0 8px 24px rgba(10, 16, 28, 0.2);
}

.top-bar::after {
    content: '';
    position: absolute;
    left: 0;
    right: 0;
    bottom: 0;
    height: 2px;
    background: linear-gradient(90deg, transparent, var(--accent), transparent);
    opacity: 0.4;
    pointer-events: none;
}

.file-info h2 {
    font-size: 1.1rem;
    font-weight: 500;
}

#save-status {
    font-size: 0.75rem;
    color: var(--text-secondary);
}

.actions {
    display: flex;
    gap: 1rem;
}

.actions button,
.preview-actions button {
    background: rgba(255, 255, 255, 0.08);
    border: 1px solid var(--border);
    color: var(--text-primary);
}

.actions button:hover,
.preview-actions button:hover {
    background: rgba(255, 255, 255, 0.16);
}

.btn-secondary {
    padding: 0.6rem 1rem;
    border-radius: 10px;
    cursor: pointer;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    transition: var(--transition);
}

.btn-primary {
    background: var(--accent);
    color: #fff;
    border: none;
    padding: 0.6rem 1.2rem;
    border-radius: 10px;
    cursor: pointer;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    transition: var(--transition);
}

.btn-primary:hover {
    background: var(--accent-hover);
    transform: translateY(-1px);
}

.btn-danger {
    background: rgba(239, 68, 68, 0.1);
    color: var(--danger);
    border: 1px solid rgba(239, 68, 68, 0.2);
    width: 40px;
    height: 40px;
    border-radius: 10px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
}

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

/* Editor Section */
.editor-area {
    flex: 1;
    display: flex;
    overflow: hidden;
}

.pane {
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.editor-pane {
    width: 40%;
    border-right: 1px solid var(--border);
}

.preview-pane {
    flex: 1;
    background: var(--preview-bg);
    color: var(--preview-text);
}

.pane-header {
    padding: 0.75rem 1.5rem;
    background: var(--pane-header-bg);
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: space-between;
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.editor-pane .pane-header {
    background: var(--pane-header-bg);
}

.preview-pane .pane-header {
    background: var(--pane-header-preview-bg);
    border-bottom: 1px solid var(--border);
    color: var(--text-secondary);
}

#editor {
    flex: 1;
    background: var(--editor-bg);
    color: var(--editor-text);
    border: none;
    padding: 1.5rem;
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.95rem;
    line-height: 1.6;
    resize: none;
    outline: none;
}

.mermaid-container {
    flex: 1;
    overflow: hidden; /* Hide overflow to handle movement via transforms */
    padding: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--mermaid-bg);
    cursor: grab;
    position: relative;
}

.mermaid-container:active {
    cursor: grabbing;
}

#mermaid-render {
    transform-origin: 0 0; /* Important for cursor-relative zooming */
    will-change: transform;
    transition: transform 0.05s linear; /* Very slight transition for smoothness */
}

.resizer {
    width: 4px;
    background: var(--border);
    cursor: col-resize;
    transition: background 0.2s;
}

.resizer:hover {
    background: var(--accent);
}

/* Modals */
.modal-backdrop {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.8);
    backdrop-filter: blur(5px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 2000;
    transition: opacity 0.3s;
}

.modal {
    background: var(--modal-bg);
    padding: 2rem;
    border-radius: 20px;
    width: 100%;
    max-width: 520px;
    border: 1px solid var(--border);
    box-shadow: 0 30px 60px rgba(0,0,0,0.5);
}

.modal h3 {
    margin-bottom: 1.5rem;
}

.modal input {
    width: 100%;
    padding: 12px;
    background: rgba(0, 0, 0, 0.12);
    border: 1px solid var(--border);
    border-radius: 10px;
    color: var(--text-primary);
    margin-bottom: 1.5rem;
}

.share-label {
    display: block;
    font-size: 0.8rem;
    color: var(--text-secondary);
    margin-bottom: 0.4rem;
}

#share-link {
    font-size: 0.85rem;
}

.modal input[readonly] {
    opacity: 0.9;
}

.modal-buttons {
    display: flex;
    justify-content: flex-end;
    gap: 0.75rem;
    flex-wrap: wrap;
}

.modal-buttons button {
    padding: 0.6rem 1rem;
    border-radius: 10px;
    cursor: pointer;
    font-weight: 600;
    border: 1px solid var(--border);
    background: rgba(255, 255, 255, 0.08);
    color: var(--text-primary);
    min-height: 38px;
}

.modal-buttons .btn-primary {
    background: var(--accent);
    border: none;
    color: #fff;
}

.modal-buttons .btn-secondary {
    background: rgba(255, 255, 255, 0.12);
}

#modal-cancel {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
}

#share-revoke,
#share-close {
    color: var(--text-secondary);
}

.hidden {
    display: none !important;
}

/* Collapsible States */
.sidebar.collapsed {
    width: 0;
    min-width: 0;
    padding: 0;
    margin: 0;
    border: none;
    overflow: hidden;
}

.editor-pane.collapsed {
    width: 0;
    min-width: 0;
    padding: 0;
    margin: 0;
    border: none;
    flex: 0;
    overflow: hidden;
}

/* Transitions */
.sidebar, .editor-pane {
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Selection Box for Window Zoom */
.selection-rect {
    position: absolute;
    border: 2px dashed #6366f1;
    background: rgba(99, 102, 241, 0.1);
    pointer-events: none;
    z-index: 1000;
}

/* Theme Selector */
.theme-select {
    background: rgba(255, 255, 255, 0.12);
    border: 1px solid var(--border);
    color: var(--text-primary);
    padding: 6px 10px;
    border-radius: 8px;
    font-size: 0.85rem;
    min-height: 32px;
    display: inline-flex;
    align-items: center;
    box-shadow: 0 6px 12px rgba(10, 16, 28, 0.12);
    outline: none;
    cursor: pointer;
    transition: all 0.2s;
}

.theme-select:hover {
    background: rgba(255, 255, 255, 0.16);
}

.theme-select option {
    background: var(--modal-bg);
    color: var(--text-primary);
}

/* Specific Panel Header adjustments */
.preview-left {
    display: flex;
    align-items: center;
    gap: 12px;
}

.preview-actions {
    display: flex;
    align-items: center;
    gap: 8px;
}

.left-actions {
    display: flex;
    align-items: center;
    gap: 12px;
}

.sidebar-actions {
    display: flex;
    gap: 8px;
}

/* Resizer hidden when panels collapsed */
.app-container:has(.sidebar.collapsed) .resizer {
    display: none;
}
.app-container:has(.editor-pane.collapsed) .resizer {
    display: none;
}

@media (max-width: 980px) {
    .sidebar {
        position: absolute;
        height: 100%;
        z-index: 60;
        box-shadow: 16px 0 40px rgba(10, 16, 28, 0.3);
    }

    .main-content {
        width: 100%;
    }

    .top-bar {
        padding: 0 1rem;
    }

    .editor-area {
        flex-direction: column;
    }

    .editor-pane {
        width: 100%;
        height: 45%;
        border-right: none;
        border-bottom: 1px solid var(--border);
    }

    .preview-pane {
        height: 55%;
    }

    .resizer {
        display: none;
    }

    .actions {
        gap: 0.6rem;
        flex-wrap: wrap;
    }
}