/* ============================================
   MedTranslate — Premium Dark UI
   ============================================ */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&display=swap');

:root {
    --primary: #7c3aed;
    --primary-hover: #6d28d9;
    --primary-glow: rgba(124, 58, 237, 0.15);
    --accent: #06b6d4;
    --success: #10b981;
    --warning: #f59e0b;
    --danger: #ef4444;

    --bg-body: #09090b;
    --bg-surface: #18181b;
    --bg-elevated: #27272a;
    --bg-input: #09090b;

    --border: rgba(255, 255, 255, 0.06);
    --border-hover: rgba(255, 255, 255, 0.12);
    --border-focus: var(--primary);

    --text: #fafafa;
    --text-secondary: #a1a1aa;
    --text-muted: #71717a;

    --radius: 14px;
    --radius-sm: 10px;
    --radius-xs: 6px;

    --transition: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html { scroll-behavior: smooth; }

body {
    font-family: 'Inter', -apple-system, sans-serif;
    background: var(--bg-body);
    color: var(--text);
    min-height: 100vh;
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

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

/* ============ Sidebar ============ */
.sidebar {
    width: 240px;
    background: var(--bg-surface);
    border-right: 1px solid var(--border);
    padding: 28px 16px;
    position: fixed;
    top: 0;
    left: 0;
    height: 100vh;
    display: flex;
    flex-direction: column;
    z-index: 100;
}

.brand {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 0 12px 24px;
    margin-bottom: 8px;
    text-decoration: none;
}

.brand-icon {
    width: 36px;
    height: 36px;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    border-radius: 10px;
    display: grid;
    place-items: center;
    font-size: 1rem;
    flex-shrink: 0;
}

.brand-name {
    font-size: 0.95rem;
    font-weight: 700;
    color: var(--text);
    letter-spacing: -0.3px;
}

.brand-name small {
    display: block;
    font-size: 0.65rem;
    font-weight: 400;
    color: var(--text-muted);
    letter-spacing: 0;
    margin-top: 2px;
}

.nav {
    display: flex;
    flex-direction: column;
    gap: 2px;
    flex: 1;
}

.nav a {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 14px;
    border-radius: 8px;
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.85rem;
    font-weight: 500;
    transition: var(--transition);
}

.nav a:hover {
    background: var(--bg-elevated);
    color: var(--text);
}

.nav a.active {
    background: var(--primary-glow);
    color: #c4b5fd;
}

.nav a .icon {
    width: 20px;
    text-align: center;
    font-size: 0.95rem;
}

.sidebar-bottom {
    padding-top: 16px;
    border-top: 1px solid var(--border);
    margin-top: auto;
}

.sidebar-bottom p {
    font-size: 0.68rem;
    color: var(--text-muted);
    text-align: center;
}

.logout-link {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 10px 14px;
    border-radius: 8px;
    color: var(--text-muted);
    text-decoration: none;
    font-size: 0.82rem;
    font-weight: 500;
    transition: var(--transition);
}

.logout-link:hover {
    background: rgba(239, 68, 68, 0.08);
    color: var(--danger);
}

/* ============ Main ============ */
.main {
    margin-left: 240px;
    flex: 1;
    padding: 32px 40px;
}

.content {
    width: 100%;
    max-width: 900px;
    margin: 0 auto;
}

/* ============ Page Title ============ */
.title-section {
    margin-bottom: 24px;
}

.title-section h1 {
    font-size: 1.4rem;
    font-weight: 800;
    letter-spacing: -0.5px;
    color: var(--text);
    margin-bottom: 4px;
}

.title-section p {
    font-size: 0.85rem;
    color: var(--text-muted);
}

/* ============ Surface / Card ============ */
.surface {
    background: var(--bg-surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 20px;
    margin-bottom: 16px;
    transition: border-color var(--transition);
}

.surface:hover {
    border-color: var(--border-hover);
}

.surface-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
}

.surface-title {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text);
}

/* ============ Buttons ============ */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 10px 20px;
    border: none;
    border-radius: 8px;
    font-size: 0.82rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    text-decoration: none;
    line-height: 1;
    white-space: nowrap;
}

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

.btn-success {
    background: var(--success);
    color: #fff;
}
.btn-success:hover { background: #059669; }

.btn-ghost {
    background: transparent;
    color: var(--text-secondary);
    border: 1px solid var(--border);
}
.btn-ghost:hover { border-color: var(--border-hover); color: var(--text); }

.btn-danger {
    background: transparent;
    color: var(--danger);
    border: 1px solid rgba(239,68,68,0.2);
}
.btn-danger:hover { background: var(--danger); color: #fff; }

.btn-warning {
    background: transparent;
    color: var(--warning);
    border: 1px solid rgba(245,158,11,0.2);
}
.btn-warning:hover { background: var(--warning); color: #000; }

.btn-lg { padding: 14px 32px; font-size: 0.9rem; border-radius: 10px; }
.btn-sm { padding: 7px 14px; font-size: 0.75rem; }
.btn:disabled { opacity: 0.35; pointer-events: none; }

/* ============ Upload ============ */
.upload-drop {
    border: 1.5px dashed rgba(124, 58, 237, 0.3);
    border-radius: var(--radius);
    padding: 56px 32px;
    text-align: center;
    cursor: pointer;
    transition: var(--transition);
    background: rgba(124, 58, 237, 0.02);
}

.upload-drop:hover,
.upload-drop.dragover {
    border-color: var(--primary);
    background: rgba(124, 58, 237, 0.06);
}

.upload-drop .drop-icon {
    font-size: 2.8rem;
    margin-bottom: 16px;
    display: block;
    opacity: 0.8;
}

.upload-drop h3 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 4px;
}

.upload-drop p {
    font-size: 0.82rem;
    color: var(--text-muted);
}

.file-badge {
    display: none;
    margin-top: 16px;
    padding: 10px 16px;
    background: rgba(16, 185, 129, 0.06);
    border: 1px solid rgba(16, 185, 129, 0.15);
    border-radius: 8px;
    font-size: 0.82rem;
    color: var(--success);
}

.file-badge.show { display: block; }

.upload-footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-top: 20px;
    gap: 12px;
}

/* Language Selector */
.lang-select {
    display: flex;
    align-items: center;
    gap: 8px;
}

.lang-select label {
    font-size: 0.78rem;
    color: var(--text-muted);
    white-space: nowrap;
}

.lang-select select {
    padding: 9px 14px;
    background: var(--bg-input);
    border: 1px solid var(--border);
    border-radius: 8px;
    color: var(--text);
    font-size: 0.82rem;
    cursor: pointer;
    transition: var(--transition);
    appearance: none;
    -webkit-appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' fill='%2371717a' viewBox='0 0 16 16'%3E%3Cpath d='M8 11L3 6h10l-5 5z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 10px center;
    padding-right: 30px;
}

.lang-select select:focus {
    outline: none;
    border-color: var(--primary);
}

/* ============ Progress ============ */
.pbar-track {
    height: 6px;
    background: var(--bg-elevated);
    border-radius: 3px;
    overflow: hidden;
}

.pbar-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--primary), var(--accent));
    border-radius: 3px;
    transition: width 0.6s ease;
}

/* ============ Editor ============ */
.editor {
    width: 100%;
    min-height: 480px;
    padding: 24px;
    background: var(--bg-body);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    color: var(--text);
    font-size: 0.92rem;
    line-height: 1.9;
    resize: vertical;
    font-family: 'Inter', sans-serif;
    transition: border-color var(--transition);
}

.editor:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px var(--primary-glow);
}

.editor-footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-top: 16px;
}

.editor-footer .hint {
    font-size: 0.75rem;
    color: var(--text-muted);
}

/* ============ Skip Words ============ */
.skip-input-row {
    display: flex;
    gap: 10px;
}

.skip-input-row input,
.skip-input-row select {
    padding: 10px 14px;
    background: var(--bg-input);
    border: 1px solid var(--border);
    border-radius: 8px;
    color: var(--text);
    font-size: 0.85rem;
    transition: var(--transition);
}

.skip-input-row input { flex: 1; }
.skip-input-row input:focus,
.skip-input-row select:focus { outline: none; border-color: var(--primary); }

.detect-info {
    background: rgba(16,185,129,0.04);
    border: 1px solid rgba(16,185,129,0.1);
    border-radius: var(--radius-sm);
    padding: 20px;
    margin-bottom: 20px;
}

.detect-info h4 {
    font-size: 0.82rem;
    color: var(--success);
    margin-bottom: 10px;
}

.detect-info ul {
    padding-left: 18px;
    font-size: 0.8rem;
    color: var(--text-secondary);
    line-height: 2;
}

.cat-section { margin-bottom: 20px; }

.cat-section h4 {
    font-size: 0.7rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--text-muted);
    margin-bottom: 10px;
}

.tags { display: flex; flex-wrap: wrap; gap: 6px; }

.tag {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 5px 12px;
    background: rgba(124,58,237,0.06);
    border: 1px solid rgba(124,58,237,0.12);
    border-radius: 16px;
    font-size: 0.78rem;
    color: #c4b5fd;
}

.tag button {
    background: none; border: none;
    color: var(--text-muted); cursor: pointer;
    font-size: 0.9rem; line-height: 1;
}
.tag button:hover { color: var(--danger); }

/* ============ History ============ */
.h-card {
    background: var(--bg-surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 22px 24px;
    margin-bottom: 12px;
    transition: var(--transition);
}

.h-card:hover { border-color: var(--border-hover); transform: translateY(-1px); }

.h-top {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 14px;
}

.h-top h3 {
    font-size: 0.9rem;
    font-weight: 600;
    margin-bottom: 6px;
}

.h-meta {
    display: flex;
    gap: 14px;
    font-size: 0.75rem;
    color: var(--text-muted);
}

.h-meta code {
    background: var(--bg-elevated);
    padding: 1px 6px;
    border-radius: 4px;
    font-size: 0.7rem;
}

.badge {
    padding: 5px 12px;
    border-radius: 14px;
    font-size: 0.7rem;
    font-weight: 600;
}

.badge-done { background: rgba(16,185,129,0.08); color: var(--success); border: 1px solid rgba(16,185,129,0.15); }
.badge-fail { background: rgba(239,68,68,0.08); color: var(--danger); border: 1px solid rgba(239,68,68,0.15); }
.badge-wip { background: rgba(245,158,11,0.08); color: var(--warning); border: 1px solid rgba(245,158,11,0.15); }

.h-actions {
    display: flex;
    gap: 8px;
    padding-top: 14px;
    border-top: 1px solid var(--border);
}

/* ============ Empty ============ */
.empty {
    text-align: center;
    padding: 64px 24px;
    color: var(--text-muted);
}

.empty .icon { font-size: 2.4rem; margin-bottom: 12px; opacity: 0.4; }
.empty a { color: #c4b5fd; text-decoration: none; }

/* ============ Loading ============ */
.loader {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    padding: 32px;
    color: var(--text-muted);
    font-size: 0.85rem;
}

.spin {
    width: 16px; height: 16px;
    border: 2px solid var(--border);
    border-top-color: var(--primary);
    border-radius: 50%;
    animation: spin 0.6s linear infinite;
}

@keyframes spin { to { transform: rotate(360deg); } }

/* ============ Responsive ============ */
@media (max-width: 860px) {
    .sidebar {
        position: static;
        width: 100%;
        height: auto;
        flex-direction: row;
        padding: 12px 16px;
        align-items: center;
        overflow-x: auto;
    }
    .brand { padding: 0; margin-bottom: 0; margin-right: 16px; border-right: 1px solid var(--border); padding-right: 16px; }
    .nav { flex-direction: row; gap: 2px; }
    .sidebar-bottom { display: none; }
    .app { flex-direction: column; }
    .main { margin-left: 0; padding: 24px 16px; }
    .content { max-width: 100%; }
    .skip-input-row { flex-direction: column; }
    .upload-footer { flex-direction: column; align-items: stretch; }
}