:root {
  --bg: #0f172a;
  --bg-soft: #111827;
  --card: #1f2937;
  --card-hover: #273449;
  --text: #f9fafb;
  --muted: #9ca3af;
  --border: #374151;
  --primary: #2563eb;
  --primary-hover: #1d4ed8;
  --danger: #ef4444;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  min-height: 100vh;
  font-family: "Segoe UI", system-ui, -apple-system, sans-serif;
  background: linear-gradient(180deg, #0b1220 0%, #111827 100%);
  color: var(--text);
}

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

code {
  background: rgba(255,255,255,0.08);
  padding: 2px 6px;
  border-radius: 6px;
  font-size: 0.9em;
}

.login-page {
  display: grid;
  place-items: center;
  padding: 24px;
}

.login-card {
  width: 100%;
  max-width: 420px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 18px;
  padding: 28px;
  box-shadow: 0 20px 60px rgba(0,0,0,0.35);
}

.brand {
  text-align: center;
  margin-bottom: 24px;
}

.brand-icon {
  width: 64px;
  height: 64px;
  margin: 0 auto 14px;
  border-radius: 18px;
  display: grid;
  place-items: center;
  background: rgba(37, 99, 235, 0.15);
  color: #93c5fd;
  font-size: 1.6rem;
}

.brand h1 {
  margin: 0 0 6px;
  font-size: 1.6rem;
}

.brand p {
  margin: 0;
  color: var(--muted);
}

.login-form {
  display: grid;
  gap: 14px;
}

.login-form label {
  display: grid;
  gap: 6px;
}

.login-form span {
  font-size: 0.92rem;
  color: var(--muted);
}

.login-form input {
  width: 100%;
  height: 44px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: #111827;
  color: var(--text);
  padding: 0 12px;
  font-size: 1rem;
}

.login-form input:focus {
  outline: 2px solid rgba(37, 99, 235, 0.45);
  border-color: var(--primary);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  border-radius: 10px;
  border: 1px solid transparent;
  padding: 10px 14px;
  font-size: 0.95rem;
  cursor: pointer;
}

.btn-primary {
  background: var(--primary);
  color: #fff;
  height: 44px;
  font-size: 1rem;
}

.btn-primary:hover {
  background: var(--primary-hover);
}

.btn-ghost {
  background: transparent;
  border-color: var(--border);
  color: var(--text);
}

.btn-ghost:hover {
  background: rgba(255,255,255,0.05);
}

.alert {
  padding: 12px 14px;
  border-radius: 10px;
  margin-bottom: 14px;
  font-size: 0.95rem;
}

.alert-error {
  background: rgba(239, 68, 68, 0.12);
  border: 1px solid rgba(239, 68, 68, 0.35);
  color: #fecaca;
}

.topbar {
  border-bottom: 1px solid var(--border);
  background: rgba(17, 24, 39, 0.92);
  backdrop-filter: blur(8px);
  position: sticky;
  top: 0;
  z-index: 10;
}

.topbar-inner {
  max-width: 1100px;
  margin: 0 auto;
  padding: 14px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}

.topbar-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 1.05rem;
}

.topbar-brand-link {
  display: inline-flex;
  align-items: center;
  gap: 10px;
}

.topbar-brand-link:hover {
  color: #93c5fd;
}

.topbar-user {
  display: flex;
  align-items: center;
  gap: 12px;
  color: var(--muted);
  font-size: 0.92rem;
}

.page {
  max-width: 1100px;
  margin: 0 auto;
  padding: 28px 20px 40px;
}

.hero h1 {
  margin: 0 0 8px;
  font-size: 2rem;
}

.hero p {
  margin: 0;
  color: var(--muted);
  max-width: 720px;
}

.app-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 16px;
  margin-top: 28px;
}

.app-card {
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: 14px;
  align-items: center;
  padding: 18px;
  border-radius: 16px;
  border: 1px solid var(--border);
  background: var(--card);
  transition: transform 0.15s ease, background 0.15s ease, border-color 0.15s ease;
}

.app-card:hover {
  transform: translateY(-2px);
  background: var(--card-hover);
  border-color: color-mix(in srgb, var(--accent) 50%, var(--border));
}

.app-icon {
  width: 52px;
  height: 52px;
  border-radius: 14px;
  display: grid;
  place-items: center;
  background: color-mix(in srgb, var(--accent) 18%, transparent);
  color: var(--accent);
  font-size: 1.25rem;
}

.app-body h2 {
  margin: 0 0 6px;
  font-size: 1.08rem;
}

.app-body p {
  margin: 0;
  color: var(--muted);
  font-size: 0.92rem;
  line-height: 1.45;
}

.app-arrow {
  color: var(--muted);
  font-size: 0.95rem;
}

@media (max-width: 640px) {
  .hero h1 { font-size: 1.6rem; }
  .topbar-user span { display: none; }
}

.empty-state {
  margin-top: 28px;
  padding: 36px 24px;
  border: 1px dashed var(--border);
  border-radius: 16px;
  text-align: center;
  color: var(--muted);
  background: rgba(255,255,255,0.02);
}

.empty-state i {
  font-size: 2rem;
  margin-bottom: 12px;
  color: #64748b;
}

.file-list {
  display: grid;
  gap: 10px;
  margin-top: 28px;
}

.file-row {
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: 14px;
  align-items: center;
  padding: 16px 18px;
  border-radius: 14px;
  border: 1px solid var(--border);
  background: var(--card);
  transition: background 0.15s ease, border-color 0.15s ease;
}

.file-row:hover {
  background: var(--card-hover);
  border-color: #0284c7;
}

.file-icon {
  width: 44px;
  height: 44px;
  border-radius: 12px;
  display: grid;
  place-items: center;
  background: rgba(2, 132, 199, 0.15);
  color: #38bdf8;
  font-size: 1.1rem;
}

.file-meta {
  display: grid;
  gap: 4px;
  min-width: 0;
}

.file-meta strong {
  word-break: break-all;
}

.file-meta small {
  color: var(--muted);
}

.file-action {
  color: var(--muted);
}

.back-link {
  margin-top: 28px;
}

.back-link a {
  color: #93c5fd;
}

.back-link a:hover {
  text-decoration: underline;
}

.upload-panel {
  margin-top: 24px;
}

.dropzone {
  position: relative;
  border: 2px dashed var(--border);
  border-radius: 16px;
  background: rgba(255,255,255,0.02);
  transition: border-color 0.15s ease, background 0.15s ease;
  cursor: pointer;
}

.dropzone:focus {
  outline: 2px solid rgba(37, 99, 235, 0.45);
  outline-offset: 2px;
}

.dropzone.is-dragover,
.dropzone:hover {
  border-color: #0284c7;
  background: rgba(2, 132, 199, 0.08);
}

.dropzone.is-uploading {
  opacity: 0.7;
  pointer-events: none;
}

.file-input {
  position: absolute;
  inset: 0;
  opacity: 0;
  pointer-events: none;
}

.dropzone-inner {
  display: grid;
  justify-items: center;
  gap: 8px;
  padding: 34px 20px;
  text-align: center;
}

.dropzone-inner i {
  font-size: 2rem;
  color: #38bdf8;
}

.dropzone-inner strong {
  font-size: 1.05rem;
}

.dropzone-inner span,
.dropzone-inner small {
  color: var(--muted);
}

.upload-status {
  margin-top: 12px;
  padding: 12px 14px;
  border-radius: 10px;
  font-size: 0.95rem;
}

.upload-status.info {
  background: rgba(37, 99, 235, 0.12);
  border: 1px solid rgba(37, 99, 235, 0.35);
  color: #bfdbfe;
}

.upload-status.success {
  background: rgba(22, 163, 74, 0.12);
  border: 1px solid rgba(22, 163, 74, 0.35);
  color: #bbf7d0;
}

.upload-status.error {
  background: rgba(239, 68, 68, 0.12);
  border: 1px solid rgba(239, 68, 68, 0.35);
  color: #fecaca;
}

.files-section {
  margin-top: 32px;
}

.files-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 12px;
}

.files-header h2 {
  margin: 0;
  font-size: 1.2rem;
}

.files-count {
  color: var(--muted);
  font-size: 0.92rem;
}

.breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin-top: 18px;
  color: var(--muted);
  font-size: 0.95rem;
}

.breadcrumbs a {
  color: #93c5fd;
}

.breadcrumbs a:hover {
  text-decoration: underline;
}

.crumb-sep {
  color: #64748b;
}

.folder-row {
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: 14px;
  align-items: center;
  padding: 16px 18px;
  border-radius: 14px;
  border: 1px solid var(--border);
  background: var(--card);
  transition: background 0.15s ease, border-color 0.15s ease;
  margin-bottom: 10px;
}

.folder-row:hover {
  background: var(--card-hover);
  border-color: #f59e0b;
}

.folder-row.parent-row {
  margin-bottom: 14px;
}

.folder-icon {
  background: rgba(245, 158, 11, 0.15);
  color: #fbbf24;
}