/* ════════════════════════════════════════════════════════════
   ZENTOOL PDF — Premium Design System
   Dark glassmorphism + violet/indigo accent palette
   ════════════════════════════════════════════════════════════ */

:root {
    --bg-base:      #0a0b0f;
    --bg-surface:   #111318;
    --bg-card:      rgba(255,255,255,0.04);
    --bg-card-hover:rgba(255,255,255,0.08);
    --border:       rgba(255,255,255,0.08);
    --border-hover: rgba(255,255,255,0.18);
    --accent:       #6366f1;
    --accent-2:     #8b5cf6;
    --accent-glow:  rgba(99,102,241,0.35);
    --text-primary: #f1f5f9;
    --text-secondary:#94a3b8;
    --text-muted:   #475569;
    --success:      #10b981;
    --warning:      #f59e0b;
    --danger:       #ef4444;
    --radius-sm:    8px;
    --radius-md:    14px;
    --radius-lg:    20px;
    --radius-xl:    28px;
    --shadow-card:  0 4px 24px rgba(0,0,0,0.4);
    --shadow-glow:  0 0 40px rgba(99,102,241,0.15);
    --transition:   0.22s cubic-bezier(0.4,0,0.2,1);
    --font:         'Inter', -apple-system, sans-serif;
}

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

html { scroll-behavior: smooth; }

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

a { text-decoration: none; color: inherit; }

/* ─── Background Effects ────────────────────────────────────── */
.bg-grid {
    position: fixed; inset: 0; z-index: 0;
    background-image:
        linear-gradient(rgba(99,102,241,0.04) 1px, transparent 1px),
        linear-gradient(90deg, rgba(99,102,241,0.04) 1px, transparent 1px);
    background-size: 60px 60px;
    pointer-events: none;
}

.bg-blob {
    position: fixed; border-radius: 50%;
    filter: blur(120px); opacity: 0.18;
    pointer-events: none; z-index: 0;
    animation: blobFloat 12s ease-in-out infinite;
}
.blob-1 { width: 600px; height: 600px; background: #6366f1; top: -200px; left: -200px; animation-delay: 0s; }
.blob-2 { width: 500px; height: 500px; background: #8b5cf6; bottom: -150px; right: -150px; animation-delay: 4s; }
.blob-3 { width: 350px; height: 350px; background: #06b6d4; top: 50%; left: 50%; transform: translate(-50%,-50%); animation-delay: 8s; }

@keyframes blobFloat {
    0%, 100% { transform: translate(0,0) scale(1); }
    33% { transform: translate(30px,-20px) scale(1.05); }
    66% { transform: translate(-20px,15px) scale(0.97); }
}

/* ─── Header ────────────────────────────────────────────────── */
.site-header {
    position: sticky; top: 0; z-index: 100;
    background: rgba(10,11,15,0.85);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border);
    padding: 0 24px;
}
.header-inner {
    max-width: 1280px; margin: 0 auto;
    display: flex; align-items: center; justify-content: space-between;
    height: 64px;
}
.logo {
    display: flex; align-items: center; gap: 10px;
    font-size: 1.25rem; font-weight: 600; letter-spacing: -0.02em;
}
.logo-icon { font-size: 1.5rem; }
.logo-text strong { color: var(--accent); }

.btn-lang {
    background: var(--bg-card);
    border: 1px solid var(--border);
    color: var(--text-secondary);
    padding: 8px 16px; border-radius: var(--radius-sm);
    cursor: pointer; font-size: 0.875rem; font-family: var(--font);
    transition: var(--transition);
}
.btn-lang:hover {
    border-color: var(--accent); color: var(--text-primary);
    background: var(--bg-card-hover);
}

/* ─── Hero ──────────────────────────────────────────────────── */
.hero {
    position: relative; z-index: 1;
    text-align: center;
    padding: 72px 24px 56px;
}
.hero-title {
    font-size: clamp(2rem, 5vw, 3.5rem);
    font-weight: 800; letter-spacing: -0.04em;
    background: linear-gradient(135deg, #f1f5f9 0%, #6366f1 50%, #8b5cf6 100%);
    -webkit-background-clip: text; -webkit-text-fill-color: transparent;
    background-clip: text; margin-bottom: 16px;
}
.hero-subtitle {
    font-size: 1.125rem; color: var(--text-secondary);
    max-width: 560px; margin: 0 auto 36px;
}
.search-bar {
    position: relative; max-width: 520px; margin: 0 auto;
}
.search-icon {
    position: absolute; left: 18px; top: 50%;
    transform: translateY(-50%); font-size: 1.1rem; pointer-events: none;
}
#search-input {
    width: 100%; padding: 16px 20px 16px 52px;
    background: var(--bg-card); border: 1px solid var(--border);
    border-radius: var(--radius-lg); color: var(--text-primary);
    font-size: 1rem; font-family: var(--font);
    outline: none; transition: var(--transition);
}
#search-input::placeholder { color: var(--text-muted); }
#search-input:focus {
    border-color: var(--accent);
    box-shadow: 0 0 0 3px var(--accent-glow);
}

/* ─── Tools Main ────────────────────────────────────────────── */
.tools-main {
    position: relative; z-index: 1;
    max-width: 1280px; margin: 0 auto;
    padding: 0 24px 80px;
    display: flex; flex-direction: column; gap: 56px;
}
.tool-category { animation: fadeInUp 0.5s ease both; }

@keyframes fadeInUp {
    from { opacity: 0; transform: translateY(24px); }
    to   { opacity: 1; transform: translateY(0); }
}

.cat-title {
    font-size: 1.25rem; font-weight: 700;
    color: var(--text-primary); margin-bottom: 20px;
    display: flex; align-items: center; gap: 10px;
    padding-bottom: 14px;
    border-bottom: 1px solid var(--border);
}
.cat-icon { font-size: 1.3rem; }

.tools-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
    gap: 16px;
}

/* ─── Tool Card ─────────────────────────────────────────────── */
.tool-card {
    display: flex; flex-direction: column; gap: 10px;
    padding: 22px 20px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    cursor: pointer; position: relative; overflow: hidden;
    transition: var(--transition);
    box-shadow: var(--shadow-card);
}
.tool-card::before {
    content: ''; position: absolute; inset: 0;
    background: linear-gradient(135deg, var(--accent-glow), transparent);
    opacity: 0; transition: var(--transition);
}
.tool-card:hover {
    border-color: var(--border-hover);
    transform: translateY(-3px);
    box-shadow: var(--shadow-card), var(--shadow-glow);
    background: var(--bg-card-hover);
}
.tool-card:hover::before { opacity: 0.3; }

.tool-icon {
    width: 48px; height: 48px; border-radius: var(--radius-sm);
    display: flex; align-items: center; justify-content: center;
    font-size: 1.5rem; flex-shrink: 0;
}
.tool-card h3 {
    font-size: 0.975rem; font-weight: 700;
    color: var(--text-primary); line-height: 1.3;
}
.tool-card p {
    font-size: 0.825rem; color: var(--text-secondary);
    line-height: 1.5; flex: 1;
}
.badge-client, .badge-server {
    display: inline-block; font-size: 0.7rem; font-weight: 600;
    padding: 3px 8px; border-radius: 999px; width: fit-content;
    letter-spacing: 0.02em;
}
.badge-client {
    background: rgba(16,185,129,0.15); color: #10b981;
    border: 1px solid rgba(16,185,129,0.3);
}
.badge-server {
    background: rgba(99,102,241,0.15); color: #818cf8;
    border: 1px solid rgba(99,102,241,0.3);
}

/* ─── Footer ────────────────────────────────────────────────── */
.site-footer {
    position: relative; z-index: 1;
    text-align: center; padding: 40px 24px;
    border-top: 1px solid var(--border);
    color: var(--text-muted); font-size: 0.875rem;
}
.site-footer strong { color: var(--text-secondary); }
.footer-sub { margin-top: 6px; font-size: 0.8rem; }

/* ═══════════════════════════════════════════════════════════════
   TOOL PAGE STYLES (used in tool.html)
   ═══════════════════════════════════════════════════════════════ */
.tool-page {
    position: relative; z-index: 1;
    max-width: 1100px; margin: 0 auto;
    padding: 40px 24px 80px;
}
.tool-page-header {
    display: flex; align-items: center; gap: 16px;
    margin-bottom: 32px;
}
.tool-page-icon {
    width: 64px; height: 64px; border-radius: var(--radius-md);
    display: flex; align-items: center; justify-content: center;
    font-size: 2rem;
}
.tool-page-header h1 { font-size: 1.75rem; font-weight: 800; letter-spacing: -0.03em; }
.tool-page-header p { color: var(--text-secondary); font-size: 0.975rem; margin-top: 4px; }
.back-link {
    display: inline-flex; align-items: center; gap: 6px;
    color: var(--text-muted); font-size: 0.875rem;
    margin-bottom: 24px; transition: var(--transition);
}
.back-link:hover { color: var(--accent); }

/* ─── Dropzone ──────────────────────────────────────────────── */
.dropzone {
    border: 2px dashed var(--border);
    border-radius: var(--radius-lg);
    padding: 60px 40px;
    text-align: center; cursor: pointer;
    transition: var(--transition);
    background: var(--bg-card);
    position: relative; overflow: hidden;
}
.dropzone:hover, .dropzone.drag-over {
    border-color: var(--accent);
    background: rgba(99,102,241,0.06);
    box-shadow: 0 0 0 4px var(--accent-glow);
}
.dropzone-icon { font-size: 3.5rem; margin-bottom: 16px; }
.dropzone h3 { font-size: 1.1rem; font-weight: 600; margin-bottom: 8px; }
.dropzone p { color: var(--text-secondary); font-size: 0.9rem; }
.dropzone input[type="file"] { display: none; }

/* ─── Thumbnail Grid (Organize/Merge) ──────────────────────── */
.thumbnail-toolbar {
    display: flex; align-items: center; justify-content: space-between;
    padding: 16px 0; gap: 12px; flex-wrap: wrap;
}
.thumbnail-toolbar .tool-info {
    font-size: 0.875rem; color: var(--text-secondary);
}
.zoom-control {
    display: flex; align-items: center; gap: 8px;
    font-size: 0.825rem; color: var(--text-muted);
}
.zoom-control input[type="range"] {
    width: 80px; accent-color: var(--accent);
}

.thumbnail-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(var(--thumb-size, 160px), 1fr));
    gap: 16px;
    min-height: 200px;
    padding: 8px;
}
.thumbnail-grid.sortable-drag { cursor: grabbing; }

.page-thumb {
    background: var(--bg-card);
    border: 2px solid var(--border);
    border-radius: var(--radius-md);
    overflow: hidden; cursor: grab;
    transition: var(--transition);
    position: relative;
    user-select: none;
}
.page-thumb:hover {
    border-color: var(--accent);
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(0,0,0,0.4);
}
.page-thumb.selected {
    border-color: var(--accent);
    box-shadow: 0 0 0 3px var(--accent-glow);
}
.page-thumb.sortable-chosen {
    opacity: 0.9;
    transform: scale(1.04) rotate(1deg);
    box-shadow: 0 16px 40px rgba(0,0,0,0.6);
    z-index: 999;
}
.page-thumb.sortable-ghost { opacity: 0.25; }

.thumb-canvas-wrap {
    width: 100%; aspect-ratio: 0.707; /* A4 ratio */
    background: #fff; display: flex; align-items: center; justify-content: center;
    overflow: hidden;
}
.thumb-canvas-wrap canvas { width: 100%; height: 100%; object-fit: contain; }

.thumb-footer {
    padding: 8px 10px;
    display: flex; align-items: center; justify-content: space-between;
}
.thumb-num {
    font-size: 0.75rem; font-weight: 600; color: var(--text-muted);
}
.thumb-filename {
    font-size: 0.65rem; color: var(--text-muted);
    white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
    max-width: 80px;
}
.thumb-actions {
    display: flex; gap: 4px;
}
.thumb-btn {
    width: 24px; height: 24px; border-radius: 6px;
    border: none; cursor: pointer;
    display: flex; align-items: center; justify-content: center;
    font-size: 0.75rem; transition: var(--transition);
    background: transparent; color: var(--text-muted);
}
.thumb-btn:hover { background: rgba(255,255,255,0.1); color: var(--text-primary); }
.thumb-btn.delete:hover { background: rgba(239,68,68,0.2); color: var(--danger); }

/* Rotate badge on thumb */
.page-thumb .rotate-badge {
    position: absolute; top: 6px; left: 6px;
    background: rgba(0,0,0,0.6); backdrop-filter: blur(4px);
    border-radius: 4px; padding: 2px 5px;
    font-size: 0.65rem; color: #fff; pointer-events: none;
}

/* ─── Buttons ───────────────────────────────────────────────── */
.btn-primary {
    display: inline-flex; align-items: center; gap: 8px;
    padding: 14px 28px; border-radius: var(--radius-md);
    background: linear-gradient(135deg, var(--accent), var(--accent-2));
    color: #fff; font-weight: 700; font-size: 1rem;
    border: none; cursor: pointer; font-family: var(--font);
    transition: var(--transition);
    box-shadow: 0 4px 16px var(--accent-glow);
}
.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 24px var(--accent-glow);
    filter: brightness(1.1);
}
.btn-primary:disabled {
    opacity: 0.5; cursor: not-allowed; transform: none; filter: none;
}
.btn-secondary {
    display: inline-flex; align-items: center; gap: 8px;
    padding: 12px 24px; border-radius: var(--radius-md);
    background: var(--bg-card); border: 1px solid var(--border);
    color: var(--text-secondary); font-weight: 600; font-size: 0.95rem;
    cursor: pointer; font-family: var(--font); transition: var(--transition);
}
.btn-secondary:hover {
    border-color: var(--border-hover); color: var(--text-primary);
    background: var(--bg-card-hover);
}
.btn-danger {
    background: rgba(239,68,68,0.12); border: 1px solid rgba(239,68,68,0.3);
    color: var(--danger);
}
.btn-danger:hover { background: rgba(239,68,68,0.2); }

.action-bar {
    display: flex; align-items: center; gap: 12px;
    padding: 20px 0; flex-wrap: wrap;
}

/* ─── Progress / Status ─────────────────────────────────────── */
.status-panel {
    background: var(--bg-card); border: 1px solid var(--border);
    border-radius: var(--radius-md); padding: 24px;
    text-align: center; display: none;
}
.status-panel.active { display: block; }
.status-icon { font-size: 2.5rem; margin-bottom: 12px; }
.status-title { font-size: 1.2rem; font-weight: 700; margin-bottom: 8px; }
.status-desc { color: var(--text-secondary); font-size: 0.9rem; }

.progress-bar-track {
    width: 100%; height: 6px; background: var(--border);
    border-radius: 999px; margin: 20px 0; overflow: hidden;
}
.progress-bar-fill {
    height: 100%; width: 0%; border-radius: 999px;
    background: linear-gradient(90deg, var(--accent), var(--accent-2));
    transition: width 0.4s ease;
    animation: progressGlow 1.5s ease-in-out infinite;
}
@keyframes progressGlow {
    0%, 100% { filter: brightness(1); }
    50% { filter: brightness(1.3); }
}

/* ─── Result Panel ──────────────────────────────────────────── */
.result-panel {
    background: var(--bg-card); border: 1px solid rgba(16,185,129,0.3);
    border-radius: var(--radius-md); padding: 28px;
    display: none; text-align: center;
}
.result-panel.active { display: block; }
.result-success-icon { font-size: 3rem; margin-bottom: 12px; }
.result-title { font-size: 1.3rem; font-weight: 700; color: var(--success); margin-bottom: 20px; }
.result-actions { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; }

/* ─── Settings Panel ────────────────────────────────────────── */
.settings-panel {
    background: var(--bg-card); border: 1px solid var(--border);
    border-radius: var(--radius-md); padding: 20px 24px;
    margin-bottom: 20px;
}
.setting-row {
    display: flex; align-items: center; justify-content: space-between;
    padding: 12px 0; border-bottom: 1px solid var(--border);
    gap: 16px;
}
.setting-row:last-child { border-bottom: none; padding-bottom: 0; }
.setting-label { font-size: 0.9rem; font-weight: 500; }
.setting-hint { font-size: 0.775rem; color: var(--text-muted); margin-top: 2px; }

.custom-select, .custom-input {
    background: var(--bg-surface); border: 1px solid var(--border);
    color: var(--text-primary); border-radius: var(--radius-sm);
    padding: 8px 12px; font-family: var(--font); font-size: 0.875rem;
    outline: none; transition: var(--transition); min-width: 160px;
}
.custom-select:focus, .custom-input:focus {
    border-color: var(--accent);
    box-shadow: 0 0 0 3px var(--accent-glow);
}
.custom-input { min-width: 200px; }

/* Toggle switch */
.toggle { position: relative; width: 44px; height: 24px; flex-shrink: 0; }
.toggle input { opacity: 0; width: 0; height: 0; }
.toggle-slider {
    position: absolute; cursor: pointer; inset: 0;
    background: var(--bg-surface); border: 1px solid var(--border);
    border-radius: 999px; transition: var(--transition);
}
.toggle-slider::before {
    content: ''; position: absolute; left: 3px; top: 50%;
    transform: translateY(-50%); width: 16px; height: 16px;
    background: var(--text-muted); border-radius: 50%; transition: var(--transition);
}
.toggle input:checked + .toggle-slider { background: var(--accent); border-color: var(--accent); }
.toggle input:checked + .toggle-slider::before { left: 23px; background: #fff; }

/* ─── OCR / Upload specific ─────────────────────────────────── */
.lang-pills {
    display: flex; gap: 8px; flex-wrap: wrap;
}
.lang-pill {
    padding: 6px 14px; border-radius: 999px; font-size: 0.8rem; font-weight: 600;
    border: 1px solid var(--border); cursor: pointer; transition: var(--transition);
    background: var(--bg-card); color: var(--text-secondary);
}
.lang-pill.active {
    background: var(--accent); color: #fff; border-color: var(--accent);
}

/* ─── Hidden ────────────────────────────────────────────────── */
.hidden { display: none !important; }

/* ─── Responsive ────────────────────────────────────────────── */
@media (max-width: 768px) {
    .tools-grid { grid-template-columns: repeat(auto-fill, minmax(160px, 1fr)); }
    .hero { padding: 48px 16px 36px; }
    .tool-page { padding: 24px 16px 60px; }
    .thumbnail-grid { grid-template-columns: repeat(auto-fill, minmax(120px, 1fr)); }
    .action-bar { flex-direction: column; align-items: stretch; }
    .btn-primary, .btn-secondary { width: 100%; justify-content: center; }
}

/* ─── Scrollbar ─────────────────────────────────────────────── */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--text-muted); }

/* ─── Animations ────────────────────────────────────────────── */
@keyframes spin {
    to { transform: rotate(360deg); }
}
.spinner {
    display: inline-block; width: 24px; height: 24px;
    border: 3px solid var(--border); border-top-color: var(--accent);
    border-radius: 50%; animation: spin 0.8s linear infinite;
}