/* ============================================================
   Demo · 2026-04-25 — Stylesheet
   ============================================================ */

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

:root {
  --bg: #0f0f13;
  --surface: #1a1a24;
  --border: #2e2e3e;
  --primary: #7c6ff7;
  --primary-hover: #9b96ff;
  --text: #e8e8f0;
  --muted: #7a7a9a;
  --radius: 14px;
}

body {
  background: var(--bg);
  color: var(--text);
  font-family: 'Segoe UI', system-ui, sans-serif;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
}

.container {
  width: 100%;
  max-width: 720px;
}

/* ── Header ── */
header {
  text-align: center;
  margin-bottom: 40px;
}

.date-badge {
  display: inline-block;
  background: var(--primary);
  color: #fff;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  padding: 4px 12px;
  border-radius: 999px;
  margin-bottom: 16px;
}

h1 {
  font-size: clamp(2rem, 5vw, 3rem);
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-bottom: 8px;
}

.subtitle {
  color: var(--muted);
  font-size: 1.05rem;
}

/* ── Cards grid ── */
main {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 20px;
  margin-bottom: 40px;
}

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px 24px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
  transition: border-color 0.2s;
}

.card:hover {
  border-color: var(--primary);
}

.card h2 {
  font-size: 0.9rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--muted);
}

/* ── Buttons ── */
.btn {
  cursor: pointer;
  border: none;
  border-radius: 8px;
  padding: 8px 20px;
  font-size: 1rem;
  font-weight: 600;
  transition: all 0.15s;
}

.btn-primary {
  background: var(--primary);
  color: #fff;
}
.btn-primary:hover {
  background: var(--primary-hover);
  transform: translateY(-1px);
}

.btn-outline {
  background: transparent;
  border: 2px solid var(--border);
  color: var(--text);
  width: 44px;
  height: 44px;
  padding: 0;
  font-size: 1.4rem;
  border-radius: 50%;
}
.btn-outline:hover {
  border-color: var(--primary);
  color: var(--primary);
}

.btn-ghost {
  background: transparent;
  color: var(--muted);
  font-size: 0.85rem;
  padding: 4px 12px;
}
.btn-ghost:hover {
  color: var(--text);
}

/* ── Counter ── */
.counter-box {
  display: flex;
  align-items: center;
  gap: 16px;
}

.count-display {
  font-size: 2.4rem;
  font-weight: 800;
  min-width: 60px;
  text-align: center;
  font-variant-numeric: tabular-nums;
}

/* ── Color box ── */
.color-box {
  width: 120px;
  height: 80px;
  border-radius: 10px;
  background: #ffffff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  border: 1px solid var(--border);
  transition: background 0.4s;
  font-family: monospace;
}

/* ── Clock ── */
.clock {
  font-size: 2rem;
  font-weight: 800;
  font-variant-numeric: tabular-nums;
  font-family: monospace;
  letter-spacing: 0.05em;
}

.hint {
  color: var(--muted);
  font-size: 0.8rem;
}

/* ── Guestbook ── */
.guestbook {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px 28px;
  margin-bottom: 32px;
}

.gb-header {
  margin-bottom: 24px;
}

.guestbook h2 {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 6px;
}

.gb-subtitle {
  color: var(--muted);
  font-size: 0.85rem;
}

.gb-form {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: 28px;
}

.gb-form input,
.gb-form textarea {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text);
  font-family: inherit;
  font-size: 0.95rem;
  padding: 10px 14px;
  resize: vertical;
  transition: border-color 0.15s;
  width: 100%;
}

.gb-form input:focus,
.gb-form textarea:focus {
  border-color: var(--primary);
  outline: none;
}

.gb-form input::placeholder,
.gb-form textarea::placeholder {
  color: var(--muted);
}

.gb-form .btn-primary {
  align-self: flex-start;
}

.gb-form .btn-primary:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none;
}

/* Message list */
.gb-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.gb-loading,
.gb-empty {
  color: var(--muted);
  font-size: 0.9rem;
  text-align: center;
  padding: 20px 0;
}

.gb-item {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 14px 16px;
  animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(-6px); }
  to   { opacity: 1; transform: translateY(0); }
}

.gb-item-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 6px;
}

.gb-name {
  font-weight: 700;
  font-size: 0.9rem;
  color: var(--primary);
}

.gb-time {
  font-size: 0.75rem;
  color: var(--muted);
}

.gb-message {
  font-size: 0.95rem;
  line-height: 1.5;
  word-break: break-word;
}

/* ── Footer ── */
footer {
  text-align: center;
  color: var(--muted);
  font-size: 0.85rem;
}

footer strong {
  color: var(--primary);
}