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

:root {
  --bg: #0a0a0f; --surface: #12121a; --surface2: #1a1a26;
  --border: #2a2a3a; --text: #e8e8f0; --text-dim: #7a7a8e;
  --accent: #6c5ce7; --accent-glow: rgba(108, 92, 231, 0.3);
  --danger: #e74c3c; --danger-glow: rgba(231, 76, 60, 0.25);
  --success: #00b894;
  --radius: 14px; --radius-sm: 8px;
  --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

body {
  font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
  background: var(--bg); color: var(--text);
  min-height: 100vh; line-height: 1.6;
}

a { color: var(--accent); text-decoration: none; transition: var(--transition); }
a:hover { text-shadow: 0 0 12px var(--accent-glow); }

.container { max-width: 900px; margin: 0 auto; padding: 40px 20px; }

/* Header */
.header {
  display: flex; align-items: center; justify-content: space-between;
  margin-bottom: 50px; padding-bottom: 20px; border-bottom: 1px solid var(--border);
}
.logo { display: flex; align-items: center; gap: 10px; font-size: 1.5rem; font-weight: 700; }
.logo svg { width: 28px; height: 28px; color: var(--accent); }

.nav { display: flex; gap: 8px; }
.nav a, .nav button {
  padding: 8px 18px; border-radius: 50px; font-size: 0.85rem; font-weight: 500;
  border: 1px solid var(--border); background: transparent; color: var(--text-dim);
  cursor: pointer; transition: var(--transition); font-family: inherit;
  display: inline-flex; align-items: center; gap: 6px;
}
.nav a:hover, .nav button:hover { border-color: var(--accent); color: var(--accent); text-shadow: none; }
.nav .active { background: var(--accent); border-color: var(--accent); color: #fff; }

/* File List */
.file-list { display: flex; flex-direction: column; gap: 6px; }
.file-row {
  display: flex; align-items: center; gap: 16px; padding: 14px 20px;
  border-radius: var(--radius-sm); transition: var(--transition); cursor: pointer;
}
.file-row:hover { background: var(--surface2); }
.file-icon {
  width: 40px; height: 40px; border-radius: 10px; background: var(--surface2);
  display: flex; align-items: center; justify-content: center;
  font-size: 0.65rem; font-weight: 700; text-transform: uppercase;
  color: var(--accent); flex-shrink: 0; letter-spacing: 0.5px;
}
.file-info { flex: 1; min-width: 0; }
.file-name { font-weight: 600; font-size: 0.95rem; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.file-meta { font-size: 0.78rem; color: var(--text-dim); margin-top: 2px; }
.file-size { font-size: 0.82rem; color: var(--text-dim); flex-shrink: 0; font-variant-numeric: tabular-nums; }

/* Empty State */
.empty-state { text-align: center; padding: 80px 20px; color: var(--text-dim); }
.empty-state svg { width: 64px; height: 64px; margin-bottom: 16px; opacity: 0.4; color: var(--text-dim); }
.empty-state p { font-size: 0.95rem; }

/* File Card */
.file-card {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 30px;
}
.file-card-header { display: flex; align-items: flex-start; justify-content: space-between; margin-bottom: 24px; gap: 16px; }
.file-card-title { font-size: 1.3rem; font-weight: 700; word-break: break-all; }
.file-card-meta { font-size: 0.82rem; color: var(--text-dim); margin-top: 6px; }

.preview-area {
  background: var(--bg); border: 1px solid var(--border); border-radius: var(--radius-sm);
  margin-bottom: 24px; overflow: hidden; max-height: 500px;
  display: flex; align-items: center; justify-content: center;
}
.preview-area img, .preview-area video { max-width: 100%; max-height: 500px; display: block; }
.preview-area audio { width: 100%; padding: 20px; }
.preview-text {
  width: 100%; padding: 20px; font-family: 'Consolas', monospace; font-size: 0.82rem;
  line-height: 1.7; overflow: auto; max-height: 500px; white-space: pre-wrap; word-break: break-all;
}
.preview-unsupported { padding: 40px; text-align: center; color: var(--text-dim); font-size: 0.9rem; }

/* Links */
.link-section { display: flex; flex-direction: column; gap: 12px; margin-bottom: 24px; }
.link-row {
  display: flex; align-items: center; gap: 10px; background: var(--bg);
  border: 1px solid var(--border); border-radius: var(--radius-sm); padding: 10px 16px;
}
.link-url { flex: 1; font-size: 0.82rem; font-family: monospace; color: var(--accent); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; min-width: 0; }
.copy-btn {
  padding: 6px 14px; border-radius: 6px; border: 1px solid var(--border); background: transparent;
  color: var(--text-dim); font-size: 0.78rem; cursor: pointer; transition: var(--transition);
  font-family: inherit; flex-shrink: 0; display: flex; align-items: center; gap: 6px;
}
.copy-btn:hover { border-color: var(--accent); color: var(--accent); }
.copy-btn.copied { border-color: var(--success); color: var(--success); }

/* Toggle */
.toggle-row { display: flex; align-items: center; gap: 10px; margin-bottom: 16px; }
.toggle { position: relative; width: 42px; height: 24px; flex-shrink: 0; }
.toggle input { opacity: 0; width: 0; height: 0; }
.toggle-slider {
  position: absolute; inset: 0; background: var(--surface2); border-radius: 50px;
  cursor: pointer; transition: var(--transition); border: 1px solid var(--border);
}
.toggle-slider::before {
  content: ''; position: absolute; width: 18px; height: 18px; border-radius: 50%;
  background: var(--text-dim); top: 2px; left: 3px; transition: var(--transition);
}
.toggle input:checked + .toggle-slider { background: var(--accent); border-color: var(--accent); }
.toggle input:checked + .toggle-slider::before { transform: translateX(18px); background: #fff; }
.toggle-label { font-size: 0.85rem; color: var(--text-dim); cursor: pointer; }

/* Admin */
.admin-actions { display: flex; gap: 8px; padding-top: 16px; border-top: 1px solid var(--border); }
.btn {
  padding: 10px 20px; border-radius: var(--radius-sm); font-size: 0.85rem; font-weight: 500;
  border: none; cursor: pointer; transition: var(--transition); font-family: inherit;
  display: inline-flex; align-items: center; gap: 8px;
}
.btn-danger { background: var(--danger-glow); color: var(--danger); border: 1px solid rgba(231,76,60,0.3); }
.btn-danger:hover { background: var(--danger); color: #fff; }
.btn-secondary { background: var(--surface2); color: var(--text-dim); border: 1px solid var(--border); }
.btn-secondary:hover { border-color: var(--text-dim); color: var(--text); }
.btn-primary { background: var(--accent); color: #fff; }
.btn-primary:hover { box-shadow: 0 0 20px var(--accent-glow); }

/* Upload */
.dropzone {
  border: 2px dashed var(--border); border-radius: var(--radius);
  padding: 60px 30px; text-align: center; transition: var(--transition);
  cursor: pointer; margin-bottom: 30px;
}
.dropzone:hover, .dropzone.dragover { border-color: var(--accent); background: rgba(108,92,231,0.05); }
.dropzone svg { width: 48px; height: 48px; margin-bottom: 12px; opacity: 0.5; color: var(--text-dim); }
.dropzone p { color: var(--text-dim); font-size: 0.9rem; }
.dropzone p span { color: var(--accent); text-decoration: underline; cursor: pointer; }

.upload-progress { margin-top: 16px; display: none; }
.progress-bar { height: 4px; background: var(--surface2); border-radius: 50px; overflow: hidden; }
.progress-fill { height: 100%; background: var(--accent); border-radius: 50px; width: 0%; transition: width 0.3s ease; }
.progress-text { font-size: 0.78rem; color: var(--text-dim); margin-top: 8px; }
.uploaded-files { display: flex; flex-direction: column; gap: 6px; margin-top: 20px; }
.uploaded-item {
  display: flex; align-items: center; justify-content: space-between; padding: 10px 16px;
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius-sm); font-size: 0.85rem;
}
.uploaded-item .status { font-size: 0.78rem; }

/* Modal */
.modal-overlay {
  position: fixed; inset: 0; background: rgba(0,0,0,0.7); backdrop-filter: blur(8px);
  display: flex; align-items: center; justify-content: center; z-index: 1000;
  opacity: 0; pointer-events: none; transition: var(--transition);
}
.modal-overlay.active { opacity: 1; pointer-events: all; }
.modal {
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 30px; width: 90%; max-width: 380px; transform: translateY(20px); transition: var(--transition);
}
.modal-overlay.active .modal { transform: translateY(0); }
.modal h3 { margin-bottom: 16px; font-size: 1.1rem; }
.modal input[type="password"] {
  width: 100%; padding: 12px 16px; border-radius: var(--radius-sm); border: 1px solid var(--border);
  background: var(--bg); color: var(--text); font-size: 0.9rem; outline: none; transition: var(--transition);
  font-family: inherit; margin-bottom: 16px;
}
.modal input[type="password"]:focus { border-color: var(--accent); }
.modal .modal-actions { display: flex; gap: 8px; justify-content: flex-end; }
.modal .error-msg { color: var(--danger); font-size: 0.8rem; margin-bottom: 12px; display: none; }

.back-link {
  display: inline-flex; align-items: center; gap: 6px; color: var(--text-dim);
  font-size: 0.85rem; margin-bottom: 24px; transition: var(--transition);
}
.back-link:hover { color: var(--text); text-shadow: none; }

.toast {
  position: fixed; bottom: 30px; right: 30px; padding: 14px 24px;
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius-sm);
  font-size: 0.85rem; z-index: 2000; transform: translateY(100px); opacity: 0; transition: var(--transition);
}
.toast.show { transform: translateY(0); opacity: 1; }
.toast.success { border-color: var(--success); color: var(--success); }
.toast.error { border-color: var(--danger); color: var(--danger); }

@media (max-width: 600px) {
  .container { padding: 20px 14px; }
  .header { flex-direction: column; align-items: flex-start; gap: 16px; }
  .file-card { padding: 20px; }
  .file-card-header { flex-direction: column; }
  .link-row { flex-direction: column; align-items: stretch; }
  .link-url { white-space: normal; }
}