:root {
    /* Base Colors (Light Mode) */
    --primary: #0066cc;
    --primary-hover: #0052a3;
    --primary-light: #e6f0ff;
    
    --success: #10b981;
    --success-bg: #ecfdf5;
    
    --danger: #ef4444;
    --danger-hover: #dc2626;
    --danger-bg: #fef2f2;
    
    --text-main: #111827;
    --text-muted: #6b7280;
    --text-light: #9ca3af;
    
    --bg-body: #f9fafb;
    --bg-surface: #ffffff;
    --bg-sidebar: #ffffff;
    
    --border: #e5e7eb;
    --border-hover: #d1d5db;

    /* Badge Colors */
    --badge-git-bg: #eff6ff;
    --badge-git-text: #1d4ed8;
    --badge-upload-bg: #ecfdf5;
    --badge-upload-text: #047857;

    /* UI Specific */
    --preview-bar-bg: #f1f5f9;
    --input-bg: #ffffff;
    
    /* Spacing & Sizing */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    
    --container-max-width: 1400px;
}

/* Dark Mode logic: Applied if manually set to dark OR if set to auto and system is dark */
@media (prefers-color-scheme: dark) {
    :root:not([data-theme="light"]) {
        --primary: #388bfd;
        --primary-hover: #58a6ff;
        --primary-light: #0c2d6b;
        --success: #3fb950;
        --success-bg: #0f5323;
        --danger: #f85149;
        --danger-bg: #8e1519;
        --text-main: #F0F6FC;
        --text-muted: #9198A1;
        --text-light: #656C76;
        --bg-body: #0D1117;
        --bg-surface: #151B23;
        --bg-sidebar: #151B23;
        --border: #3D444D;
        --border-hover: #656C76;
        --badge-git-bg: #0c2d6b;
        --badge-git-text: #79c0ff;
        --badge-upload-bg: #033a16;
        --badge-upload-text: #7ee787;
        --preview-bar-bg: #010409;
        --input-bg: #0D1117;
        --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.4);
    }
}

:root[data-theme="dark"] {
    --primary: #388bfd;
    --primary-hover: #58a6ff;
    --primary-light: #0c2d6b;
    --success: #3fb950;
    --success-bg: #0f5323;
    --danger: #f85149;
    --danger-bg: #8e1519;
    --text-main: #F0F6FC;
    --text-muted: #9198A1;
    --text-light: #656C76;
    --bg-body: #0D1117;
    --bg-surface: #151B23;
    --bg-sidebar: #151B23;
    --border: #3D444D;
    --border-hover: #656C76;
    --badge-git-bg: #0c2d6b;
    --badge-git-text: #79c0ff;
    --badge-upload-bg: #033a16;
    --badge-upload-text: #7ee787;
    --preview-bar-bg: #010409;
    --input-bg: #0D1117;
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.4);
}

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

body {
    font-family: var(--font-sans);
    background-color: var(--bg-body);
    color: var(--text-main);
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
    min-height: 100vh;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    color: var(--text-main);
    letter-spacing: -0.025em;
}

a {
    color: var(--primary);
    text-decoration: none;
    transition: color 0.15s ease;
}

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

/* Layout */
.container {
    max-width: var(--container-max-width);
    margin: 0 auto;
    padding: 0 2rem;
}

nav {
    background: var(--bg-surface);
    border-bottom: 1px solid var(--border);
    position: sticky;
    top: 0;
    z-index: 100;
    height: 64px;
    display: flex;
    align-items: center;
}

nav .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
}

nav .brand {
    font-size: 1.125rem;
    font-weight: 700;
    color: var(--text-main);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

nav .nav-actions {
    display: flex;
    align-items: center;
    gap: 1.5rem;
}

nav .user-info {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 0.875rem;
    color: var(--text-muted);
}

nav .user-info img.avatar {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    object-fit: cover;
    border: 1px solid var(--border);
}

/* Theme Toggle */
.theme-selector {
    display: flex;
    background: var(--bg-body);
    border: 1px solid var(--border);
    border-radius: 999px;
    padding: 2px;
}

.theme-btn {
    border: none;
    background: transparent;
    cursor: pointer;
    padding: 4px 10px;
    border-radius: 999px;
    color: var(--text-muted);
    font-size: 12px;
    transition: all 0.1s ease;
}

.theme-btn.active {
    background: var(--bg-surface);
    color: var(--primary);
    box-shadow: var(--shadow-sm);
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.5rem 1.25rem;
    font-size: 0.875rem;
    font-weight: 500;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all 0.15s ease;
    border: 1px solid transparent;
}

.btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

.btn-primary {
    background-color: var(--primary);
    color: white;
    border-color: transparent;
}

.btn-primary:hover:not(:disabled) {
    background-color: var(--primary-hover);
    box-shadow: var(--shadow-sm);
}

.btn-secondary {
    background-color: var(--bg-surface);
    color: var(--text-main);
    border-color: var(--border);
}

.btn-secondary:hover:not(:disabled) {
    border-color: var(--border-hover);
    background-color: var(--bg-body);
}

.btn-danger {
    background-color: var(--bg-surface);
    color: var(--danger);
    border-color: var(--border);
}

.btn-danger:hover:not(:disabled) {
    background-color: var(--danger-bg);
    border-color: var(--danger);
}

.btn-sm {
    padding: 0.25rem 0.75rem;
    font-size: 0.75rem;
}

/* Forms */
.form-group {
    margin-bottom: 1.5rem;
}

label {
    display: block;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-main);
    margin-bottom: 0.5rem;
}

input[type="text"],
input[type="email"],
input[type="password"],
select,
textarea {
    width: 100%;
    padding: 0.625rem 0.875rem;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    background-color: var(--input-bg);
    font-size: 0.95rem;
    color: var(--text-main);
    transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

input:focus, select:focus, textarea:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px var(--primary-light);
}

.search-container {
    position: relative;
    max-width: 400px;
}

.search-input {
    padding-left: 2.75rem !important;
}

.search-icon {
    position: absolute;
    left: 1rem;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-muted);
    pointer-events: none;
}

.hint {
    font-size: 0.75rem;
    color: var(--text-muted);
    margin-top: 0.375rem;
}

/* Cards & Grid */
.grid {
    display: grid;
    gap: 1.5rem;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
}

.card {
    background: var(--bg-surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 1.5rem;
    transition: box-shadow 0.2s ease, transform 0.2s ease;
}

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

.card h3 {
    font-size: 1.125rem;
    margin-bottom: 0.5rem;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

/* Badges */
.badge {
    display: inline-flex;
    align-items: center;
    padding: 0.125rem 0.625rem;
    border-radius: 9999px;
    font-size: 0.75rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.badge.git { 
    background-color: var(--badge-git-bg); 
    color: var(--badge-git-text); 
}
.badge.upload { 
    background-color: var(--badge-upload-bg); 
    color: var(--badge-upload-text); 
}

/* Empty State */
.empty-state {
    text-align: center;
    padding: 4rem 1rem;
    background: var(--bg-surface);
    border: 1px dashed var(--border);
    border-radius: var(--radius-lg);
}

/* Drag & Drop Zone */
.dropzone {
    border: 2px dashed var(--border);
    border-radius: var(--radius-md);
    padding: 3rem 1.5rem;
    text-align: center;
    cursor: pointer;
    background: var(--bg-body);
    transition: all 0.2s ease;
}

.dropzone:hover, .dropzone.dragover {
    border-color: var(--primary);
    background: var(--primary-light);
    color: var(--primary);
}

/* Site Details (WP-like Sidebar) */
.site-wrapper {
    display: grid;
    grid-template-columns: 1fr 360px;
    gap: 0;
    min-height: calc(100vh - 64px);
}

.site-main {
    padding: 1rem;
    background: var(--bg-body);
    display: flex;
    flex-direction: column;
}

.site-sidebar {
    background: var(--bg-sidebar);
    border-left: 1px solid var(--border);
    padding: 2rem;
    overflow-y: auto;
    height: calc(100vh - 64px);
    position: sticky;
    top: 64px;
}

.preview-container {
    flex: 1;
    background: white;
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow);
    overflow: hidden;
    display: flex;
    flex-direction: column;
}

.preview-bar {
    padding: 0.75rem 1rem;
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: space-between;
    background: var(--preview-bar-bg);
}

.preview-frame {
    flex: 1;
    width: 100%;
    border: none;
}

/* Utility */
.flex { display: flex; }
.flex-col { flex-direction: column; }
.items-center { align-items: center; }
.justify-between { justify-content: space-between; }
.gap-2 { gap: 0.5rem; }
.gap-4 { gap: 1rem; }
.mb-2 { margin-bottom: 0.5rem; }
.mb-4 { margin-bottom: 1rem; }
.mb-6 { margin-bottom: 1.5rem; }
.mt-auto { margin-top: auto; }
.text-sm { font-size: 0.875rem; }
.text-xs { font-size: 0.75rem; }
.text-muted { color: var(--text-muted); }
.font-mono { font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace; }

/* Toast */
.toast-container {
    position: fixed;
    bottom: 1.5rem;
    right: 1.5rem;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    z-index: 1000;
}

.toast {
    padding: 0.75rem 1rem;
    border-radius: var(--radius-sm);
    background: #333;
    color: white;
    font-size: 0.875rem;
    box-shadow: var(--shadow-lg);
}

@media (max-width: 1024px) {
    .site-wrapper {
        grid-template-columns: 1fr;
    }
    .site-sidebar {
        height: auto;
        position: static;
        border-left: none;
        border-top: 1px solid var(--border);
    }
}