/* ==========================================
   デザイントークン
   テーマ：「口頭試問／ランプの灯り」— 深いインク色の中に、
   AIとの対話だけが暖色の灯りとして浮かび上がる。
========================================== */
:root {
  --ink: #12182b;
  --ink-soft: #1c2540;
  --ink-line: #2c3657;
  --paper: #eef0e9;
  --paper-raised: #ffffff;
  --text-main: #1b1f2a;
  --text-muted: #6b7280;
  --accent: #d98e33;
  --accent-deep: #b8721f;
  --accent-soft: #f3d9ab;
  --good: #4f9d69;
  --good-soft: #e3f3e6;
  --font-display: "Space Grotesk", sans-serif;
  --font-body: "Inter", sans-serif;
  --radius: 14px;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: var(--font-body);
  color: var(--text-main);
  background: var(--paper);
  -webkit-font-smoothing: antialiased;
}

h1, h2 {
  font-family: var(--font-display);
  margin: 0;
}

.eyebrow {
  font-family: var(--font-display);
  font-size: 0.68rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-muted);
}

button {
  font-family: var(--font-body);
  cursor: pointer;
}

.btn {
  border: none;
  border-radius: 999px;
  padding: 0.6rem 1.3rem;
  font-weight: 600;
  font-size: 0.9rem;
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}
.btn:hover {
  transform: translateY(-1px);
}
.btn:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}
.btn-primary {
  background: var(--accent);
  color: var(--ink);
  box-shadow: 0 4px 14px rgba(217, 142, 51, 0.35);
}
.btn-primary:hover {
  box-shadow: 0 6px 18px rgba(217, 142, 51, 0.45);
}
.btn-secondary {
  background: var(--ink);
  color: var(--paper);
}

/* ==========================================
   ロビー（トップページ）
========================================== */
.lobby {
  background: radial-gradient(circle at top left, #1a2242 0%, var(--ink) 55%);
  min-height: 100vh;
}

.lobby-shell {
  max-width: 920px;
  margin: 0 auto;
  padding: 4rem 1.5rem 3rem;
}

.lobby-header {
  margin-bottom: 3rem;
}

.brand {
  display: flex;
  align-items: center;
  gap: 1.1rem;
}

.brand-mark {
  font-family: var(--font-display);
  font-size: 2.4rem;
  color: var(--ink);
  background: var(--accent);
  width: 60px;
  height: 60px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.brand h1 {
  color: var(--paper);
  font-size: 1.8rem;
  letter-spacing: -0.01em;
}

.tagline {
  color: var(--accent-soft);
  font-size: 0.9rem;
  margin: 0.3rem 0 0;
}

.lobby-main {
  display: grid;
  grid-template-columns: 1.3fr 1fr;
  gap: 1.5rem;
}

@media (max-width: 760px) {
  .lobby-main {
    grid-template-columns: 1fr;
  }
}

.panel {
  background: var(--paper-raised);
  border-radius: var(--radius);
  padding: 1.6rem;
  box-shadow: 0 10px 30px rgba(10, 14, 30, 0.25);
}

.panel-head {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  margin-bottom: 1rem;
}

.class-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.class-row a {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.9rem 1rem;
  border-radius: 10px;
  background: var(--paper);
  color: var(--text-main);
  text-decoration: none;
  font-weight: 600;
  transition: background 0.15s ease;
}
.class-row a:hover {
  background: var(--accent-soft);
}
.class-arrow {
  color: var(--accent-deep);
}

.empty-row {
  color: var(--text-muted);
  font-size: 0.9rem;
  list-style: none;
  padding: 0.5rem 0;
}

.inline-form {
  display: flex;
  gap: 0.6rem;
}
.inline-form input {
  flex: 1;
}
.inline-form-vertical {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
  margin: 0.8rem 0;
}

input[type="text"], select, textarea, input[type="file"] {
  font-family: var(--font-body);
  border: 1px solid #d7d9d0;
  border-radius: 8px;
  padding: 0.55rem 0.8rem;
  font-size: 0.9rem;
  background: var(--paper-raised);
  color: var(--text-main);
}
input[type="text"]:focus, select:focus, textarea:focus {
  outline: 2px solid var(--accent);
  outline-offset: 1px;
}

.form-error {
  color: #c0392b;
  font-size: 0.82rem;
  min-height: 1.2em;
  margin-top: 0.5rem;
}

/* ==========================================
   アプリ画面（class.html）
========================================== */
.app-header {
  background: var(--ink);
  color: var(--paper);
  padding: 1.2rem 2rem;
  display: flex;
  align-items: center;
  gap: 1.5rem;
  flex-wrap: wrap;
  position: sticky;
  top: 0;
  z-index: 10;
}
.back-link {
  color: var(--accent-soft);
  text-decoration: none;
  font-size: 0.85rem;
  font-weight: 600;
  white-space: nowrap;
}
.app-header h1 {
  font-size: 1.2rem;
  flex: 1;
  min-width: 160px;
}
.tab-nav {
  display: flex;
  gap: 0.4rem;
}
.tab-btn {
  background: transparent;
  border: 1px solid var(--ink-line);
  color: var(--paper);
  border-radius: 999px;
  padding: 0.5rem 1rem;
  font-size: 0.85rem;
  font-weight: 600;
}
.tab-btn.active {
  background: var(--accent);
  color: var(--ink);
  border-color: var(--accent);
}

.tab-panel {
  display: none;
  padding: 1.6rem 2rem 3rem;
  max-width: 1400px;
  margin: 0 auto;
}
.tab-panel.active {
  display: block;
}

.student-toolbar {
  margin-bottom: 1.2rem;
  font-size: 0.85rem;
  color: var(--text-muted);
  font-weight: 600;
}
.student-toolbar select {
  margin-left: 0.5rem;
}

.cockpit-grid {
  display: grid;
  grid-template-columns: 0.85fr 1.4fr 1fr;
  gap: 1.2rem;
}
@media (max-width: 1080px) {
  .cockpit-grid {
    grid-template-columns: 1fr;
  }
}

.module-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}
.module-row {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0.7rem 0.8rem;
  border-radius: 10px;
  background: var(--paper);
  cursor: pointer;
  border: 2px solid transparent;
  font-size: 0.88rem;
}
.module-row.active {
  border-color: var(--accent);
  background: var(--accent-soft);
}
.module-number {
  font-family: var(--font-display);
  color: var(--accent-deep);
  font-weight: 700;
  font-size: 0.8rem;
  min-width: 1.4em;
}
.module-passed-dot {
  margin-left: auto;
  font-size: 0.75rem;
}

.status-badge {
  margin-top: 1rem;
  padding: 0.9rem;
  border-radius: 10px;
  font-size: 0.82rem;
  font-weight: 600;
}
.status-badge.passed {
  background: var(--good-soft);
  color: #1f5e34;
}
.status-badge.progress {
  background: var(--accent-soft);
  color: var(--accent-deep);
}

.chat-window {
  height: 420px;
  overflow-y: auto;
  background: var(--paper);
  border-radius: 10px;
  padding: 1rem;
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
  margin-bottom: 0.8rem;
}
.chat-bubble {
  max-width: 82%;
  padding: 0.6rem 0.9rem;
  border-radius: 14px;
  font-size: 0.88rem;
  line-height: 1.5;
  animation: fadeIn 0.25s ease;
}
.chat-bubble.user {
  align-self: flex-end;
  background: var(--ink);
  color: var(--paper);
  border-radius: 14px 14px 4px 14px;
}
.chat-bubble.assistant {
  align-self: flex-start;
  background: var(--paper-raised);
  border: 1px solid #e2e4da;
  border-radius: 14px 14px 14px 4px;
}
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(4px); }
  to { opacity: 1; transform: translateY(0); }
}

.chat-form {
  display: flex;
  gap: 0.6rem;
}
.chat-form input {
  flex: 1;
}

.gauge-list {
  display: flex;
  flex-direction: column;
  gap: 0.9rem;
  margin-bottom: 1.2rem;
}
.gauge-label {
  display: flex;
  justify-content: space-between;
  font-size: 0.82rem;
  font-weight: 600;
  margin-bottom: 0.3rem;
}
.gauge-track {
  height: 8px;
  border-radius: 999px;
  background: var(--paper);
  overflow: hidden;
}
.gauge-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--accent-deep), var(--accent));
  transition: width 0.4s ease;
}

.full-select {
  width: 100%;
  margin-bottom: 1rem;
}

.scores-line {
  font-size: 0.85rem;
  margin-bottom: 0.8rem;
  color: var(--text-muted);
}

.field-label {
  display: block;
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--text-muted);
  margin: 0.8rem 0 0.3rem;
}
textarea {
  width: 100%;
  resize: vertical;
}

.divider {
  height: 1px;
  background: #e2e4da;
  margin: 1.2rem 0;
}

.empty-state {
  color: var(--text-muted);
  padding: 2rem;
  text-align: center;
  background: var(--paper-raised);
  border-radius: var(--radius);
}
.hidden {
  display: none !important;
}

/* ==========================================
   入口ページ（class_select.html）
========================================== */
.lobby-shell.narrow {
  max-width: 640px;
  padding-top: 3rem;
}
.back-link-dark {
  color: var(--accent-soft);
}
.entry-card {
  background: var(--paper-raised);
  border-radius: var(--radius);
  padding: 2.4rem;
  margin-top: 1.5rem;
  box-shadow: 0 10px 30px rgba(10, 14, 30, 0.25);
  text-align: center;
}
.entry-card h1, .entry-card h2 {
  font-size: 1.5rem;
  margin-top: 0.4rem;
}
.entry-sub {
  color: var(--text-muted);
  margin: 0.6rem 0 1.8rem;
  font-size: 0.9rem;
}
.entry-choices {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}
@media (max-width: 560px) {
  .entry-choices {
    grid-template-columns: 1fr;
  }
}
.entry-choice {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.3rem;
  padding: 1.6rem 1rem;
  border-radius: 12px;
  border: 2px solid #e2e4da;
  text-decoration: none;
  color: var(--text-main);
  transition: border-color 0.15s ease, transform 0.15s ease;
}
.entry-choice:hover {
  border-color: var(--accent);
  transform: translateY(-2px);
}
.entry-icon {
  font-size: 2rem;
}
.entry-label {
  font-weight: 700;
  font-family: var(--font-display);
}
.entry-desc {
  font-size: 0.78rem;
  color: var(--text-muted);
}

/* ==========================================
   学生ログイン画面（student.html）
========================================== */
.login-panel {
  display: flex;
  justify-content: center;
  padding-top: 3rem;
}
.login-panel .entry-card {
  max-width: 480px;
  width: 100%;
  margin-top: 0;
}
.login-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}
.login-row {
  padding: 0.9rem 1rem;
  border-radius: 10px;
  background: var(--paper);
  font-weight: 600;
  cursor: pointer;
  transition: background 0.15s ease;
}
.login-row:hover {
  background: var(--accent-soft);
}

.role-chip {
  font-size: 0.78rem;
  font-weight: 700;
  padding: 0.35rem 0.8rem;
  border-radius: 999px;
  background: var(--ink-line);
  color: var(--paper);
}
.role-chip-professor {
  background: var(--accent);
  color: var(--ink);
}

.current-user-name {
  font-weight: 700;
  font-family: var(--font-display);
}
.student-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.btn-link {
  background: none;
  border: none;
  color: var(--accent-deep);
  font-size: 0.82rem;
  font-weight: 600;
  text-decoration: underline;
  padding: 0;
}

.btn-icon {
  background: none;
  border: none;
  font-size: 0.9rem;
  opacity: 0.55;
  padding: 0.2rem;
}
.btn-icon:hover {
  opacity: 1;
}

.is-loading {
  position: relative;
  opacity: 0.75;
}

/* ==========================================
   トースト通知（alert()の代わり）
========================================== */
.toast {
  position: fixed;
  bottom: 1.5rem;
  left: 50%;
  transform: translateX(-50%) translateY(20px);
  background: var(--ink);
  color: var(--paper);
  padding: 0.8rem 1.4rem;
  border-radius: 10px;
  font-size: 0.85rem;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.3);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.25s ease, transform 0.25s ease;
  z-index: 50;
}
.toast.show {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

/* ==========================================
   合格時の紙吹雪演出
========================================== */
.confetti-layer {
  position: fixed;
  inset: 0;
  pointer-events: none;
  overflow: hidden;
  z-index: 40;
}
.confetti-piece {
  position: absolute;
  top: -10px;
  width: 8px;
  height: 8px;
  border-radius: 2px;
  animation: confettiFall 1.8s ease-in forwards;
}
@keyframes confettiFall {
  to {
    transform: translateY(100vh) rotate(360deg);
    opacity: 0.2;
  }
}