:root {
  --bg: #1b1f2a;
  --card-bg: #242a38;
  --panel-bg: #161a24;
  --text: #eef1f7;
  --muted-text: #9aa4b8;
  --border-strong: #4b5468;
  --border-subtle: #343c4f;
  --shadow: rgba(0, 0, 0, 0.45);
}

:root[data-theme='light'] {
  --bg: #eef1f6;
  --card-bg: #ffffff;
  --panel-bg: #f1f3f8;
  --text: #1b1f2a;
  --muted-text: #6b7384;
  --border-strong: #c7ccd9;
  --border-subtle: #dde1ea;
  --shadow: rgba(15, 23, 42, 0.12);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  display: flex;
  justify-content: center;
  align-items: flex-start;
  padding: clamp(0.75rem, 3vw, 1.25rem);
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  transition: background-color 0.2s ease, color 0.2s ease;
}

.card {
  width: 100%;
  max-width: 480px;
  background: var(--card-bg);
  border-radius: clamp(16px, 3vw, 28px);
  padding: clamp(1.25rem, 5vw, 2.5rem);
  box-shadow: 0 20px 60px var(--shadow);
  text-align: center;
  transition: background-color 0.2s ease;
}

.top-bar {
  display: flex;
  justify-content: flex-end;
  margin-bottom: 0.5rem;
}

.theme-toggle {
  background: none;
  border: 2px solid var(--border-strong);
  border-radius: 10px;
  color: var(--text);
  font-size: clamp(0.85rem, 2.5vw, 1.1rem);
  font-weight: 600;
  padding: clamp(0.35rem, 1.5vw, 0.5rem) clamp(0.7rem, 2.5vw, 1rem);
  cursor: pointer;
}

.theme-toggle:hover {
  border-color: #5b6dff;
}

h1 {
  margin: 0 0 1.5rem;
  font-size: clamp(1.5rem, 5vw, 2.2rem);
}

.field {
  text-align: left;
  margin-bottom: 1.25rem;
}

.field label {
  display: block;
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--muted-text);
  margin-bottom: 0.4rem;
}

.field input[type="text"] {
  width: 100%;
  padding: 0.75rem 0.9rem;
  font-size: 1.05rem;
  border-radius: 10px;
  border: 2px solid var(--border-strong);
  background: var(--panel-bg);
  color: var(--text);
}

.field input[type="text"]:focus {
  outline: none;
  border-color: #5b6dff;
}

.field-error {
  color: #f87171;
  font-size: 0.9rem;
  margin-top: 0.4rem;
  min-height: 1.2em;
}

.faculty-options {
  display: flex;
  gap: 0.6rem;
  flex-wrap: wrap;
}

.faculty-btn {
  flex: 1 1 0;
  border: 2px solid var(--border-strong);
  border-radius: 10px;
  background: var(--panel-bg);
  color: var(--text);
  font-size: 0.95rem;
  font-weight: 600;
  padding: 0.75rem 0.5rem;
  cursor: pointer;
  transition: border-color 0.15s ease, background-color 0.15s ease;
}

.faculty-btn:hover {
  border-color: #5b6dff;
}

.faculty-btn.selected {
  border-color: #5b6dff;
  background: rgba(91, 109, 255, 0.15);
}

.btn {
  display: block;
  box-sizing: border-box;
  border: none;
  border-radius: clamp(8px, 2vw, 14px);
  padding: clamp(0.8rem, 3vw, 1rem);
  font-size: clamp(1.05rem, 3.5vw, 1.3rem);
  font-weight: 600;
  cursor: pointer;
  color: #fff;
  width: 100%;
  text-align: center;
  text-decoration: none;
  transition: opacity 0.15s ease, transform 0.1s ease;
}

.btn:hover {
  opacity: 0.9;
}

.btn:active {
  transform: scale(0.98);
}

.btn:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

.btn.submit {
  background: #5b6dff;
}

.btn.secondary {
  background: var(--panel-bg);
  color: var(--text);
  border: 2px solid var(--border-strong);
}

.landing-buttons {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.result {
  display: none;
  margin-top: 1.5rem;
  padding: 1.5rem 1rem;
  background: var(--panel-bg);
  border-radius: clamp(12px, 3vw, 20px);
}

.result.visible {
  display: block;
}

/* Winner notification (issue #8): the number screen turns green once the
   host draws this id, without a manual refresh — driven by the polling
   result, not just a hover/click state. */
.result.drawn {
  background: #16a34a;
  color: #fff;
}

.result.drawn .result-label,
.result.drawn .switch-link,
.result.drawn .edit-name-toggle a {
  color: rgba(255, 255, 255, 0.85);
}

.result-label {
  color: var(--muted-text);
  font-size: 0.95rem;
  margin-bottom: 0.5rem;
}

.result-id {
  font-family: "SF Mono", "Courier New", monospace;
  font-size: clamp(2rem, 10vw, 3rem);
  font-weight: 800;
  letter-spacing: 0.05em;
}

.switch-link {
  margin-top: 1.25rem;
  font-size: 0.9rem;
  color: var(--muted-text);
}

.edit-name-toggle {
  margin-top: 1rem;
  font-size: 0.9rem;
}

.edit-name-toggle a {
  color: #5b6dff;
  text-decoration: none;
  font-weight: 600;
}

.edit-name-toggle a:hover {
  text-decoration: underline;
}

.edit-name-form {
  margin-top: 1rem;
  text-align: left;
}

.edit-name-form[hidden] {
  display: none;
}