Redesign frontend: IBM Plex Mono, black/white editorial aesthetic

- IBM Plex Mono font from Google Fonts for the monospace character
- Pure black/white/gray palette — no colors except red for errors/danger
- 1px solid black borders system throughout (no shadows, no rounding)
- Header nav uses border-left separators with hover backgrounds
- Primary button: solid black; copy button: white outline (visually distinct)
- Share box: readonly input + copy button flush with no gap
- Table: outer border + gray header row + subtle row hover
- File view: centered with border around video/audio players
- Danger button: red outline, fills on hover

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

public/style.css

@@ -1,126 +1,405 @@
-*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
+@import url('https://fonts.googleapis.com/css2?family=IBM+Plex+Mono:ital,wght@0,400;0,500;0,600;1,400&display=swap');
 
-:root {
+/* ── Reset ──────────────────────────────────────────────── */
-  --bg: #0f1117;
+*, *::before, *::after {
-  --surface: #1c1f2e;
+  box-sizing: border-box;
-  --border: #2a2d3e;
+  margin: 0;
-  --accent: #6c63ff;
+  padding: 0;
-  --accent-hover: #5a52e0;
-  --text: #e2e8f0;
-  --muted: #8892a4;
-  --error: #f56565;
-  --danger: #e53e3e;
 }
 
+/* ── Tokens ─────────────────────────────────────────────── */
+:root {
+  --black:   #000;
+  --white:   #fff;
+  --gray-50: #fafafa;
+  --gray-100:#f0f0f0;
+  --gray-200:#e0e0e0;
+  --gray-400:#999;
+  --gray-600:#555;
+  --red:     #c00;
+
+  --font: 'IBM Plex Mono', 'Courier New', monospace;
+  --border: 1px solid var(--black);
+  --radius: 0;
+}
+
+/* ── Base ───────────────────────────────────────────────── */
+html { font-size: 14px; }
+
 body {
-  font-family: system-ui, -apple-system, sans-serif;
+  font-family: var(--font);
-  background: var(--bg);
+  background: var(--white);
-  color: var(--text);
+  color: var(--black);
   min-height: 100vh;
   display: flex;
   flex-direction: column;
+  -webkit-font-smoothing: antialiased;
 }
 
-a { color: var(--accent); text-decoration: none; }
+a {
-a:hover { text-decoration: underline; }
+  color: var(--black);
+  text-decoration: underline;
+  text-underline-offset: 3px;
+}
+a:hover { color: var(--gray-600); }
 
+/* ── Header ─────────────────────────────────────────────── */
 header {
   display: flex;
   align-items: center;
-  gap: 1.5rem;
+  gap: 2rem;
-  padding: 1rem 2rem;
+  padding: 0 2rem;
-  border-bottom: 1px solid var(--border);
+  height: 48px;
+  border-bottom: var(--border);
+  flex-shrink: 0;
 }
 
-.logo { font-size: 1.25rem; font-weight: 700; color: var(--text); }
+.logo {
+  font-size: 13px;
+  font-weight: 600;
+  letter-spacing: 0.08em;
+  text-transform: uppercase;
+  text-decoration: none;
+  color: var(--black);
+}
+.logo:hover { color: var(--gray-600); }
 
-nav { display: flex; align-items: center; gap: 1rem; margin-left: auto; }
+nav {
-nav a { color: var(--muted); font-size: 0.9rem; }
+  display: flex;
-nav a:hover { color: var(--text); }
+  align-items: center;
+  gap: 0;
+  margin-left: auto;
+}
 
-main { flex: 1; padding: 2rem; display: flex; justify-content: center; align-items: flex-start; }
+nav a {
+  display: block;
+  padding: 0 1rem;
+  height: 48px;
+  line-height: 48px;
+  font-size: 12px;
+  letter-spacing: 0.04em;
+  text-decoration: none;
+  color: var(--gray-600);
+  border-left: var(--border);
+}
+nav a:hover {
+  color: var(--black);
+  background: var(--gray-100);
+}
 
+nav form {
+  display: contents;
+}
+
+nav button[type="submit"] {
+  display: block;
+  padding: 0 1rem;
+  height: 48px;
+  font-size: 12px;
+  letter-spacing: 0.04em;
+  background: none;
+  border: none;
+  border-left: var(--border);
+  color: var(--gray-600);
+  cursor: pointer;
+  font-family: var(--font);
+}
+nav button[type="submit"]:hover {
+  color: var(--black);
+  background: var(--gray-100);
+}
+
+/* ── Main ───────────────────────────────────────────────── */
+main {
+  flex: 1;
+  padding: 3rem 2rem;
+}
+
+/* ── Form Container ─────────────────────────────────────── */
 .form-container {
-  width: 100%;
+  max-width: 400px;
-  max-width: 420px;
-  margin-top: 4rem;
 }
 
-.form-container h1 { margin-bottom: 1.5rem; font-size: 1.5rem; }
+.form-container h1 {
+  font-size: 16px;
+  font-weight: 600;
+  letter-spacing: 0.02em;
+  margin-bottom: 2rem;
+  padding-bottom: 1rem;
+  border-bottom: var(--border);
+}
 
-form { display: flex; flex-direction: column; gap: 1rem; }
+form {
+  display: flex;
+  flex-direction: column;
+  gap: 1.25rem;
+}
 
 label {
   display: flex;
   flex-direction: column;
   gap: 0.375rem;
-  font-size: 0.875rem;
+  font-size: 11px;
-  color: var(--muted);
+  letter-spacing: 0.06em;
+  text-transform: uppercase;
+  color: var(--gray-600);
 }
 
 input[type="text"],
 input[type="password"],
 input[type="file"] {
-  padding: 0.625rem 0.75rem;
-  background: var(--surface);
-  border: 1px solid var(--border);
-  border-radius: 6px;
-  color: var(--text);
-  font-size: 1rem;
   width: 100%;
+  padding: 0.6rem 0.75rem;
+  font-family: var(--font);
+  font-size: 13px;
+  background: var(--white);
+  border: var(--border);
+  color: var(--black);
+  outline: none;
+  transition: background 0.1s;
+}
+input[type="text"]:focus,
+input[type="password"]:focus {
+  background: var(--gray-50);
+  box-shadow: inset 0 0 0 2px var(--black);
 }
 
-input:focus { outline: 2px solid var(--accent); outline-offset: 1px; border-color: var(--accent); }
+input[type="file"] {
-
+  padding: 0.5rem;
-button, .btn {
-  padding: 0.625rem 1.25rem;
-  background: var(--accent);
-  border: none;
-  border-radius: 6px;
-  color: #fff;
-  font-size: 0.9rem;
-  font-weight: 600;
   cursor: pointer;
-  text-align: center;
+}
-  display: inline-block;
+input[type="file"]::-webkit-file-upload-button {
+  font-family: var(--font);
+  font-size: 11px;
+  letter-spacing: 0.06em;
+  text-transform: uppercase;
+  background: var(--black);
+  color: var(--white);
+  border: none;
+  padding: 0.3rem 0.6rem;
+  cursor: pointer;
+  margin-right: 0.75rem;
+}
+input[type="file"]::file-selector-button {
+  font-family: var(--font);
+  font-size: 11px;
+  letter-spacing: 0.06em;
+  text-transform: uppercase;
+  background: var(--black);
+  color: var(--white);
+  border: none;
+  padding: 0.3rem 0.6rem;
+  cursor: pointer;
+  margin-right: 0.75rem;
 }
 
-button:hover, .btn:hover { background: var(--accent-hover); }
+/* ── Primary Button ─────────────────────────────────────── */
+button[type="submit"],
+.btn-primary {
+  display: inline-block;
+  padding: 0.6rem 1.25rem;
+  font-family: var(--font);
+  font-size: 11px;
+  font-weight: 600;
+  letter-spacing: 0.08em;
+  text-transform: uppercase;
+  background: var(--black);
+  color: var(--white);
+  border: var(--border);
+  cursor: pointer;
+  transition: background 0.1s, color 0.1s;
+  text-align: center;
+}
+button[type="submit"]:hover,
+.btn-primary:hover {
+  background: var(--gray-600);
+}
 
-button.danger { background: var(--danger); }
+/* ── Danger Button ──────────────────────────────────────── */
-button.danger:hover { background: #c53030; }
+button.danger {
+  display: inline-block;
+  padding: 0.3rem 0.6rem;
+  font-family: var(--font);
+  font-size: 11px;
+  letter-spacing: 0.04em;
+  background: none;
+  color: var(--red);
+  border: 1px solid var(--red);
+  cursor: pointer;
+}
+button.danger:hover {
+  background: var(--red);
+  color: var(--white);
+}
 
-.error { color: var(--error); font-size: 0.9rem; margin-bottom: 0.5rem; }
+/* ── Generic Link-button (.btn for file-view) ───────────── */
+a.btn {
+  display: inline-block;
+  padding: 0.6rem 1.25rem;
+  font-size: 11px;
+  font-weight: 600;
+  letter-spacing: 0.08em;
+  text-transform: uppercase;
+  text-decoration: none;
+  background: var(--black);
+  color: var(--white);
+  border: var(--border);
+  transition: background 0.1s;
+}
+a.btn:hover {
+  background: var(--gray-600);
+  color: var(--white);
+}
 
+/* ── Error ──────────────────────────────────────────────── */
+.error {
+  font-size: 12px;
+  color: var(--red);
+  padding: 0.6rem 0.75rem;
+  border: 1px solid var(--red);
+  background: #fff5f5;
+  margin-bottom: 0.5rem;
+}
+
+/* ── Share Box ──────────────────────────────────────────── */
 .share-box {
   display: flex;
-  gap: 0.5rem;
+  gap: 0;
-  margin: 1rem 0;
+  margin: 1.25rem 0 1rem;
 }
-.share-box input { flex: 1; }
 
-/* File view — centered */
+.share-box input[readonly] {
+  flex: 1;
+  background: var(--gray-100);
+  color: var(--gray-600);
+  border-right: none;
+  cursor: text;
+}
+.share-box input[readonly]:focus {
+  box-shadow: none;
+  background: var(--gray-100);
+}
+
+/* Copy button — outline style, distinct from submit */
+.share-box button {
+  padding: 0.6rem 1rem;
+  font-family: var(--font);
+  font-size: 11px;
+  font-weight: 600;
+  letter-spacing: 0.08em;
+  text-transform: uppercase;
+  background: var(--white);
+  color: var(--black);
+  border: var(--border);
+  cursor: pointer;
+  white-space: nowrap;
+  transition: background 0.1s;
+  flex-shrink: 0;
+}
+.share-box button:hover {
+  background: var(--gray-100);
+}
+
+/* ── Table ──────────────────────────────────────────────── */
+h1 {
+  font-size: 16px;
+  font-weight: 600;
+  letter-spacing: 0.02em;
+  margin-bottom: 1.25rem;
+  padding-bottom: 1rem;
+  border-bottom: var(--border);
+}
+
+h1 + p {
+  margin-bottom: 1.5rem;
+  font-size: 12px;
+}
+
+table {
+  width: 100%;
+  border-collapse: collapse;
+  border: var(--border);
+}
+
+th {
+  padding: 0.6rem 1rem;
+  font-size: 11px;
+  font-weight: 600;
+  letter-spacing: 0.06em;
+  text-transform: uppercase;
+  text-align: left;
+  background: var(--gray-100);
+  border-bottom: var(--border);
+  color: var(--gray-600);
+}
+
+td {
+  padding: 0.6rem 1rem;
+  font-size: 12px;
+  border-bottom: 1px solid var(--gray-200);
+  vertical-align: middle;
+}
+
+tr:last-child td { border-bottom: none; }
+
+tr:hover td { background: var(--gray-50); }
+
+td a {
+  font-weight: 500;
+}
+
+td:last-child {
+  width: 80px;
+  text-align: right;
+}
+
+/* ── File View ──────────────────────────────────────────── */
 .file-view {
   display: flex;
   flex-direction: column;
   align-items: center;
   justify-content: center;
-  min-height: 60vh;
+  min-height: calc(100vh - 48px - 6rem);
   gap: 1.5rem;
   text-align: center;
+  max-width: 800px;
+  margin: 0 auto;
 }
 
-.file-view h1 { font-size: 1.25rem; color: var(--muted); word-break: break-all; }
+.file-view h1 {
+  font-size: 13px;
+  font-weight: 400;
+  color: var(--gray-600);
+  word-break: break-all;
+  border-bottom: none;
+  padding-bottom: 0;
+  margin-bottom: 0;
+}
 
 .file-view video,
-.file-view audio { max-width: 800px; width: 100%; border-radius: 8px; }
+.file-view audio {
+  width: 100%;
+  max-width: 720px;
+  border: var(--border);
+  display: block;
+}
 
-.file-actions { display: flex; gap: 1rem; }
+.file-actions {
+  display: flex;
+  gap: 0.75rem;
+}
 
-/* File list table */
+/* ── Utility ─────────────────────────────────────────────── */
-table { width: 100%; border-collapse: collapse; font-size: 0.9rem; }
+.form-container > p {
-th, td { padding: 0.75rem 1rem; text-align: left; border-bottom: 1px solid var(--border); }
+  font-size: 12px;
-th { color: var(--muted); font-weight: 600; }
+  color: var(--gray-600);
-tr:hover td { background: var(--surface); }
+  margin-top: 1rem;
-
+  line-height: 1.7;
-h1 { margin-bottom: 1rem; }
+}
+.form-container > p strong {
+  color: var(--black);
+  font-weight: 600;
+}
+.form-container > p a {
+  color: var(--black);
+}