/* ============================================================
   NamingTool — Design System
   Dark mode, glassmorphism, Inter font
   Pure static name generator & tag builder
   ============================================================ */

/* --- Reset & Base --- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
    --bg: #06080f;
    --bg-surface: #0d1117;
    --bg-card: rgba(17, 24, 39, 0.7);
    --bg-card-hover: rgba(24, 33, 50, 0.85);
    --border: rgba(55, 65, 81, 0.5);
    --border-focus: #3b82f6;
    --text: #e5e7eb;
    --text-muted: #6b7280;
    --text-heading: #f9fafb;
    --accent: #3b82f6;
    --accent-glow: rgba(59, 130, 246, 0.3);
    --accent-hover: #60a5fa;
    --success: #10b981;
    --warning: #f59e0b;
    --danger: #ef4444;
    --danger-hover: #f87171;
    --purple: #8b5cf6;
    --cyan: #06b6d4;
    --radius: 12px;
    --radius-sm: 8px;
    --radius-xs: 6px;
    --shadow: 0 4px 24px rgba(0,0,0,0.3);
    --shadow-lg: 0 8px 40px rgba(0,0,0,0.4);
    --transition: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    --sidebar-w: 240px;
    --font: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --mono: 'JetBrains Mono', 'Fira Code', monospace;
}

html { font-size: 16px; }
body {
    font-family: var(--font);
    background: var(--bg);
    color: var(--text);
    min-height: 100vh;
    overflow-x: hidden;
    line-height: 1.6;
}

a { color: var(--accent); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--accent-hover); }
code { font-family: var(--mono); }

/* --- Ambient Glow --- */
.bg-glow {
    position: fixed;
    border-radius: 50%;
    filter: blur(120px);
    opacity: 0.12;
    pointer-events: none;
    z-index: 0;
}
.bg-glow-1 { width: 600px; height: 600px; background: var(--accent); top: -200px; right: -100px; }
.bg-glow-2 { width: 500px; height: 500px; background: var(--purple); bottom: -150px; left: -100px; }

/* --- Sidebar --- */
.sidebar {
    position: fixed; top: 0; left: 0;
    width: var(--sidebar-w); height: 100vh;
    background: var(--bg-surface);
    border-right: 1px solid var(--border);
    display: flex; flex-direction: column;
    padding: 1.5rem 0;
    z-index: 100;
}
.sidebar-brand {
    display: flex; align-items: center; gap: 0.75rem;
    padding: 0 1.5rem; margin-bottom: 2rem;
}
.brand-icon { font-size: 1.5rem; color: var(--accent); }
.brand-text { font-weight: 700; font-size: 1.1rem; color: var(--text-heading); letter-spacing: -0.02em; }
.nav-links { list-style: none; flex: 1; }
.nav-link {
    display: flex; align-items: center; gap: 0.75rem;
    padding: 0.65rem 1.5rem;
    color: var(--text-muted);
    font-size: 0.9rem; font-weight: 500;
    transition: all var(--transition);
    border-left: 3px solid transparent;
    cursor: pointer;
}
.nav-link:hover { color: var(--text); background: rgba(59,130,246,0.06); }
.nav-link.active {
    color: var(--accent);
    border-left-color: var(--accent);
    background: rgba(59,130,246,0.08);
}
.sidebar-footer {
    padding: 1rem 1.5rem;
    border-top: 1px solid var(--border);
}
.version-badge {
    font-size: 0.7rem; color: var(--text-muted);
    background: rgba(55,65,81,0.4);
    padding: 0.2rem 0.5rem;
    border-radius: var(--radius-xs);
}

/* --- Main Content --- */
.main-content {
    margin-left: var(--sidebar-w);
    padding: 2.5rem 3rem;
    position: relative; z-index: 1;
    max-width: 1400px;
}

/* --- Page views --- */
.page-view { display: none; }
.page-view.active { display: block; }

/* --- Typography --- */
h1 { font-size: 2rem; font-weight: 700; color: var(--text-heading); letter-spacing: -0.03em; }
h2 { font-size: 1.25rem; font-weight: 600; color: var(--text-heading); }
.page-header { margin-bottom: 2rem; }
.page-subtitle { color: var(--text-muted); margin-top: 0.25rem; font-size: 0.9rem; }
.text-muted { color: var(--text-muted); }

/* --- Cards --- */
.card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1.5rem;
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    transition: border-color var(--transition);
}
.card:hover { border-color: rgba(59,130,246,0.2); }
.card-title { margin-bottom: 1rem; }
.card-header-row { display: flex; justify-content: space-between; align-items: center; margin-bottom: 1rem; }

/* --- Two Column Layout --- */
.two-col-layout {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
    align-items: start;
}

/* --- Preview Card --- */
.preview-card {
    background: linear-gradient(135deg, rgba(59,130,246,0.1), rgba(139,92,246,0.08));
    border: 1px solid rgba(59,130,246,0.25);
    border-radius: var(--radius);
    padding: 1.25rem 1.5rem;
    margin-bottom: 1.5rem;
    position: relative;
    overflow: hidden;
}
.preview-card::before {
    content: '';
    position: absolute; top: 0; left: 0; right: 0;
    height: 2px;
    background: linear-gradient(90deg, var(--accent), var(--purple), var(--cyan));
}
.preview-label {
    display: block;
    font-size: 0.7rem; font-weight: 600;
    text-transform: uppercase; letter-spacing: 0.08em;
    color: var(--text-muted); margin-bottom: 0.5rem;
}
.preview-name {
    font-family: var(--mono);
    font-size: 1.3rem; font-weight: 500;
    color: var(--accent-hover);
    letter-spacing: 0.02em;
    user-select: all;
}
.preview-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
}

/* --- Forms --- */
.form-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 1.25rem; }
.form-grid-4 { grid-template-columns: repeat(auto-fit, minmax(160px, 1fr)); }
.form-group { display: flex; flex-direction: column; gap: 0.4rem; }
.form-label { font-size: 0.8rem; font-weight: 600; color: var(--text-muted); text-transform: uppercase; letter-spacing: 0.04em; }

.form-input, .form-select {
    background: rgba(17,24,39,0.8);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    padding: 0.6rem 0.75rem;
    color: var(--text);
    font-family: var(--font);
    font-size: 0.9rem;
    transition: all var(--transition);
    outline: none;
    width: 100%;
}
.form-input:focus, .form-select:focus {
    border-color: var(--border-focus);
    box-shadow: 0 0 0 3px var(--accent-glow);
}
.form-select { cursor: pointer; 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='%236b7280' stroke-width='2'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E"); background-repeat: no-repeat; background-position: right 0.75rem center; padding-right: 2rem; }
.form-select option { background: var(--bg-surface); color: var(--text); }

.custom-input { display: none; margin-top: 0.4rem; }
.custom-input.visible { display: block; }

/* --- Tags Editor --- */
.tags-editor { background: rgba(17,24,39,0.5); border: 1px solid var(--border); border-radius: var(--radius-sm); padding: 0.75rem; }
.tags-list { display: flex; flex-wrap: wrap; gap: 0.5rem; margin-bottom: 0.5rem; }
.tag-chip {
    display: inline-flex; align-items: center; gap: 0.4rem;
    background: rgba(59,130,246,0.12);
    border: 1px solid rgba(59,130,246,0.2);
    border-radius: 20px;
    padding: 0.25rem 0.6rem;
    font-size: 0.8rem;
    animation: fadeIn 0.2s ease;
}
.tag-chip-key { font-weight: 600; color: var(--accent); }
.tag-chip-value { color: var(--text); }
.tag-chip-remove {
    cursor: pointer; color: var(--text-muted); font-size: 1rem;
    transition: color var(--transition);
    background: none; border: none; padding: 0; line-height: 1;
}
.tag-chip-remove:hover { color: var(--danger); }
.tag-input-row { display: flex; align-items: center; gap: 0.5rem; }
.tag-key-input, .tag-value-input { flex: 1; padding: 0.4rem 0.6rem; font-size: 0.85rem; }
.tag-separator { color: var(--text-muted); font-weight: 600; }

/* --- Tag Format Selector --- */
.format-options {
    display: flex; gap: 0.5rem; flex-wrap: wrap;
}
.format-option {
    display: inline-flex; align-items: center; gap: 0.3rem;
    font-size: 0.8rem; color: var(--text-muted);
    cursor: pointer;
    padding: 0.3rem 0.6rem;
    border: 1px solid var(--border);
    border-radius: var(--radius-xs);
    transition: all var(--transition);
}
.format-option:hover { border-color: var(--text-muted); }
.format-option:has(input:checked) {
    border-color: var(--accent);
    color: var(--accent);
    background: rgba(59,130,246,0.08);
}
.format-option input[type="radio"] { display: none; }

/* --- Tags Preview --- */
.tags-preview-card {
    background: rgba(17,24,39,0.6);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    padding: 0.75rem 1rem;
}
.tags-preview-text {
    font-family: var(--mono);
    font-size: 0.8rem;
    color: var(--cyan);
    white-space: pre-wrap;
    word-break: break-all;
    margin: 0;
    line-height: 1.5;
    user-select: all;
}

/* --- Buttons --- */
.btn {
    display: inline-flex; align-items: center; gap: 0.5rem;
    padding: 0.6rem 1.2rem;
    font-family: var(--font); font-size: 0.85rem; font-weight: 600;
    border: none; border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all var(--transition);
    text-decoration: none;
}
.btn-primary {
    background: var(--accent);
    color: #fff;
    box-shadow: 0 2px 12px var(--accent-glow);
}
.btn-primary:hover { background: var(--accent-hover); color: #fff; transform: translateY(-1px); box-shadow: 0 4px 20px var(--accent-glow); }
.btn-ghost {
    background: transparent;
    color: var(--text-muted);
    border: 1px solid var(--border);
}
.btn-ghost:hover { color: var(--text); border-color: var(--text-muted); }
.btn-sm { padding: 0.4rem 0.8rem; font-size: 0.8rem; }
.btn-xs { padding: 0.3rem 0.6rem; font-size: 0.75rem; }
.copy-btn.copied { border-color: var(--success); }

/* --- Resource Name Badge --- */
.resource-name { font-family: var(--mono); color: var(--cyan); font-size: 0.85rem; }

/* --- History --- */
.history-list { display: flex; flex-direction: column; gap: 0; }
.history-item {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 0.6rem 0;
    border-bottom: 1px solid rgba(55,65,81,0.2);
}
.history-item:last-child { border-bottom: none; }
.history-item code { flex: 1; }
.history-time { font-size: 0.75rem; white-space: nowrap; }

/* --- Vocabulary Page --- */
.vocab-grid { display: flex; flex-wrap: wrap; gap: 0.5rem; }
.vocab-chip {
    display: inline-flex; align-items: center; gap: 0.4rem;
    background: rgba(17,24,39,0.6);
    border: 1px solid var(--border);
    border-radius: 20px;
    padding: 0.3rem 0.75rem;
    font-size: 0.8rem;
}
.vocab-code { font-family: var(--mono); font-weight: 600; color: var(--cyan); }
.vocab-category { width: 100%; margin-bottom: 0.5rem; }
.vocab-cat-title { font-size: 0.8rem; color: var(--text-muted); margin-bottom: 0.4rem; text-transform: capitalize; }

/* --- Vocab Add Form --- */
.vocab-add-form .form-grid { align-items: end; }
.vocab-status {
    margin-top: 0.75rem;
    font-size: 0.85rem;
    padding: 0.5rem 0.75rem;
    border-radius: var(--radius-xs);
    display: none;
}
.vocab-status.success {
    display: block;
    color: var(--success);
    background: rgba(16, 185, 129, 0.1);
    border: 1px solid rgba(16, 185, 129, 0.2);
}
.vocab-status.error {
    display: block;
    color: var(--danger);
    background: rgba(239, 68, 68, 0.1);
    border: 1px solid rgba(239, 68, 68, 0.2);
}

/* --- Empty State --- */
.empty-state {
    text-align: center; padding: 3rem 1rem;
    color: var(--text-muted);
}

/* --- Animations --- */
@keyframes fadeIn { from { opacity: 0; transform: translateY(4px); } to { opacity: 1; transform: translateY(0); } }
.card { animation: fadeIn 0.3s ease; }

/* --- Responsive --- */
@media (max-width: 1024px) {
    .two-col-layout {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .sidebar { width: 60px; }
    .brand-text, .nav-link span, .sidebar-footer { display: none; }
    .sidebar-brand { padding: 0; justify-content: center; }
    .nav-link { justify-content: center; padding: 0.65rem 0; border-left: none; border-bottom: 3px solid transparent; }
    .nav-link.active { border-bottom-color: var(--accent); border-left-color: transparent; }
    .main-content { margin-left: 60px; padding: 1.5rem; }
}