:root {
  --bg: #0d1117;
  --bg-card: #161b22;
  --text: #c9d1d9;
  --text-muted: #8b949e;
  --border: #30363d;
  --accent: #58a6ff;
  --accent-hover: #79c0ff;
  --error: #f85149;
  --success: #3fb950;
  --row-hover: #1c2128;
}

body.high-contrast {
  --bg: #000;
  --bg-card: #0a0a0a;
  --text: #fff;
  --text-muted: #ccc;
  --border: #fff;
  --accent: #ff0;
  --accent-hover: #ff9;
  --error: #f44;
  --success: #4f4;
  --row-hover: #1a1a1a;
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.5;
  min-height: 100vh;
}

a { color: var(--accent); text-decoration: none; }
a:hover { color: var(--accent-hover); text-decoration: underline; }

.container {
  max-width: 720px;
  margin: 0 auto;
  padding: 2rem 1rem;
}

/* Header */
header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-bottom: 1.5rem;
  border-bottom: 1px solid var(--border);
  margin-bottom: 2rem;
}

header h1 {
  font-size: 1.1rem;
  font-weight: 600;
  letter-spacing: 0.03em;
}

.header-controls {
  display: flex;
  gap: 1rem;
  align-items: center;
  font-size: 0.8rem;
}

.header-controls a,
.header-controls button {
  color: var(--text-muted);
  background: none;
  border: 1px solid var(--border);
  padding: 0.3rem 0.6rem;
  border-radius: 4px;
  cursor: pointer;
  font-size: 0.75rem;
  font-family: inherit;
}

.header-controls a:hover,
.header-controls button:hover {
  color: var(--text);
  border-color: var(--text-muted);
  text-decoration: none;
}

/* Cards */
.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 2rem;
}

.card h2 {
  font-size: 1rem;
  margin-bottom: 1.5rem;
  font-weight: 500;
}

/* Forms */
.form-group {
  margin-bottom: 1.25rem;
}

label {
  display: block;
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 0.4rem;
}

input[type="text"],
input[type="email"],
input[type="password"] {
  width: 100%;
  padding: 0.6rem 0.8rem;
  background: var(--bg);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 4px;
  font-size: 0.9rem;
  font-family: inherit;
  outline: none;
}

input:focus {
  border-color: var(--accent);
}

.checkbox-group {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.checkbox-group input[type="checkbox"] {
  width: 1.1rem;
  height: 1.1rem;
  accent-color: var(--accent);
}

.checkbox-group label {
  margin: 0;
  color: var(--text);
  font-size: 0.9rem;
}

button[type="submit"],
.btn {
  display: inline-block;
  padding: 0.6rem 1.5rem;
  background: var(--accent);
  color: #0d1117;
  border: none;
  border-radius: 4px;
  font-size: 0.9rem;
  font-weight: 600;
  font-family: inherit;
  cursor: pointer;
  text-align: center;
}

button[type="submit"]:hover,
.btn:hover {
  background: var(--accent-hover);
  text-decoration: none;
}

.error {
  color: var(--error);
  font-size: 0.85rem;
  margin-bottom: 1rem;
}

/* Password reveal */
.password-reveal {
  background: var(--bg);
  border: 2px solid var(--accent);
  border-radius: 6px;
  padding: 1.5rem;
  text-align: center;
  margin: 1.5rem 0;
}

.password-reveal .password {
  font-family: "SF Mono", "Fira Code", "Fira Mono", Menlo, Consolas, monospace;
  font-size: 2rem;
  font-weight: 700;
  letter-spacing: 0.15em;
  color: var(--accent);
}

.password-reveal .ttl {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-top: 0.5rem;
}

/* File browser */
.breadcrumbs {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 1rem;
}

.breadcrumbs span { margin: 0 0.3rem; }

.file-table {
  width: 100%;
  border-collapse: collapse;
}

.file-table th {
  text-align: left;
  font-size: 0.75rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 0.6rem 0.8rem;
  border-bottom: 1px solid var(--border);
}

.file-table td {
  padding: 0.6rem 0.8rem;
  border-bottom: 1px solid var(--border);
  font-size: 0.9rem;
}

.file-table tr:hover td {
  background: var(--row-hover);
}

.file-table .size,
.file-table .date {
  color: var(--text-muted);
  font-size: 0.85rem;
  white-space: nowrap;
}

.file-table .name a {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.file-icon {
  font-size: 1rem;
  opacity: 0.6;
  width: 1.2rem;
  text-align: center;
}

.empty {
  text-align: center;
  color: var(--text-muted);
  padding: 3rem 0;
  font-size: 0.9rem;
}

.session-info {
  text-align: center;
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-top: 2rem;
}

/* Responsive */
@media (max-width: 600px) {
  .container { padding: 1rem 0.75rem; }
  .card { padding: 1.5rem 1rem; }
  .password-reveal .password { font-size: 1.5rem; }
  .file-table .date { display: none; }
}