/* ===== Design Tokens (Day 8の学びを自分で実装) ===== */
:root {
  --color-bg: #0b1020;
  --color-surface: #131a30;
  --color-surface-2: #1a2342;
  --color-border: #2a3358;
  --color-text: #e9ecf5;
  --color-text-dim: #9aa3c2;
  --color-action: #6c8cff;
  --color-action-hover: #8aa3ff;
  --color-success: #4ade80;
  --color-warn: #f59e0b;
  --color-danger: #ef4444;
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 24px;
  --space-6: 32px;
  --space-7: 48px;
  --shadow-md: 0 8px 24px rgba(0,0,0,0.35);
  --font-base: -apple-system, BlinkMacSystemFont, "Segoe UI", "Hiragino Sans", "Yu Gothic UI", Roboto, sans-serif;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  background: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-base);
  font-size: 16px;
  line-height: 1.65;
  min-height: 100dvh;
  padding-bottom: calc(env(safe-area-inset-bottom) + 24px);
  -webkit-font-smoothing: antialiased;
}

button { font-family: inherit; }
a { color: var(--color-action); text-decoration: none; }
a:hover { text-decoration: underline; }
.muted { color: var(--color-text-dim); }

/* ===== Header ===== */
.app-header {
  position: sticky; top: 0; z-index: 30;
  background: linear-gradient(180deg, #0b1020 70%, rgba(11,16,32,0.85) 100%);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--color-border);
  padding: max(env(safe-area-inset-top), 12px) var(--space-4) var(--space-3);
}
.header-row { display: flex; align-items: center; gap: var(--space-3); }
.brand {
  flex: 1; margin: 0; text-align: center;
  font-size: 18px; font-weight: 700; letter-spacing: 0.04em;
}
.brand span { color: var(--color-action); font-weight: 800; }
.icon-btn {
  width: 44px; height: 44px;
  background: transparent; border: 1px solid var(--color-border);
  border-radius: 12px; color: var(--color-text);
  font-size: 20px; cursor: pointer;
}
.icon-btn:active { transform: scale(0.95); }

.progress-wrap { margin-top: var(--space-3); }
.progress-track {
  height: 6px; background: var(--color-surface-2);
  border-radius: 999px; overflow: hidden;
}
.progress-bar {
  height: 100%; width: 0%;
  background: linear-gradient(90deg, #6c8cff, #b48aff);
  transition: width 0.5s ease;
}
.progress-label {
  display: flex; justify-content: space-between;
  font-size: 12px; color: var(--color-text-dim);
  margin-top: var(--space-2);
}

/* ===== Tabs ===== */
.tabs {
  display: flex; gap: var(--space-2);
  padding: var(--space-3) var(--space-4);
  background: var(--color-bg);
  position: sticky; top: 92px; z-index: 20;
  border-bottom: 1px solid transparent;
  overflow-x: auto;
}
.tab {
  flex-shrink: 0;
  padding: 10px 16px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 999px;
  color: var(--color-text-dim);
  font-size: 14px; font-weight: 600;
  cursor: pointer;
  min-height: 40px;
}
.tab.active {
  background: var(--color-action);
  color: white;
  border-color: var(--color-action);
}

/* ===== Main ===== */
.main { padding: var(--space-4); max-width: 760px; margin: 0 auto; }
.view { display: none; }
.view.active { display: block; }

/* ===== Cards ===== */
.card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-5);
  margin-bottom: var(--space-4);
  box-shadow: var(--shadow-md);
}
.card h2 { margin: 0 0 var(--space-2); font-size: 20px; line-height: 1.4; }
.card .eyebrow {
  display: inline-block;
  font-size: 12px; font-weight: 700; letter-spacing: 0.08em;
  color: var(--color-action); text-transform: uppercase;
  margin-bottom: var(--space-2);
}
.card .goal {
  background: var(--color-surface-2);
  border-left: 3px solid var(--color-action);
  padding: var(--space-3) var(--space-4);
  border-radius: var(--radius-sm);
  margin: var(--space-3) 0;
  font-size: 14px;
}
.card .meta {
  display: flex; gap: var(--space-3); flex-wrap: wrap;
  font-size: 13px; color: var(--color-text-dim);
  margin-bottom: var(--space-3);
}
.card .meta strong { color: var(--color-text); }

/* ===== Blocks ===== */
.block { margin-top: var(--space-4); }
.block-head {
  display: flex; align-items: center; gap: var(--space-2);
  margin-bottom: var(--space-3);
}
.block-tag {
  font-size: 11px; font-weight: 700;
  padding: 3px 8px; border-radius: 6px;
  text-transform: uppercase; letter-spacing: 0.05em;
}
.block-tag.learn { background: rgba(108,140,255,0.15); color: #b3c4ff; }
.block-tag.practice { background: rgba(74,222,128,0.15); color: #86efac; }
.block-tag.reflect { background: rgba(245,158,11,0.15); color: #fcd34d; }
.block-title { font-size: 16px; font-weight: 700; margin: 0; flex: 1; }
.block-min { font-size: 12px; color: var(--color-text-dim); }

.block ul { padding-left: 0; list-style: none; margin: 0; }
.block li {
  position: relative;
  padding: var(--space-2) 0 var(--space-2) 28px;
  font-size: 15px; line-height: 1.6;
  border-bottom: 1px dashed rgba(154,163,194,0.15);
}
.block li:before {
  content: "→"; position: absolute; left: 6px;
  color: var(--color-action); font-weight: 700;
}
.block li:last-child { border-bottom: none; }

.resources-list {
  margin-top: var(--space-3);
  padding: var(--space-3); background: var(--color-surface-2);
  border-radius: var(--radius-sm);
}
.resources-list .title {
  font-size: 12px; font-weight: 700;
  color: var(--color-text-dim); text-transform: uppercase;
  letter-spacing: 0.08em; margin-bottom: var(--space-2);
}
.resources-list a {
  display: block; padding: var(--space-2) 0;
  font-size: 14px;
  border-bottom: 1px dashed rgba(154,163,194,0.15);
}
.resources-list a:last-child { border-bottom: none; }

/* ===== Quiz ===== */
.quiz {
  margin-top: var(--space-4); padding: var(--space-4);
  background: rgba(108,140,255,0.06);
  border: 1px solid rgba(108,140,255,0.2);
  border-radius: var(--radius-md);
}
.quiz h3 { margin: 0 0 var(--space-2); font-size: 15px; }
.quiz-item { margin: var(--space-3) 0; }
.quiz-q { font-weight: 600; margin-bottom: var(--space-1); }
.quiz-a {
  background: var(--color-surface);
  border-radius: var(--radius-sm);
  padding: var(--space-3);
  font-size: 14px; color: var(--color-text-dim);
  display: none;
}
.quiz-toggle {
  font-size: 12px; color: var(--color-action);
  background: transparent; border: 0;
  cursor: pointer; padding: 4px 0;
}

.key-concepts {
  margin-top: var(--space-3);
  display: flex; flex-wrap: wrap; gap: var(--space-2);
}
.chip {
  font-size: 12px; padding: 6px 12px;
  background: var(--color-surface-2);
  border: 1px solid var(--color-border);
  border-radius: 999px;
}

/* ===== Buttons ===== */
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  min-height: 48px; padding: 0 24px;
  background: var(--color-action); color: white;
  border: 0; border-radius: 12px;
  font-weight: 700; font-size: 15px;
  cursor: pointer; transition: 0.2s;
}
.btn:hover { background: var(--color-action-hover); }
.btn.ghost {
  background: transparent;
  border: 1px solid var(--color-border);
  color: var(--color-text);
}
.btn.danger { color: var(--color-danger); border-color: var(--color-danger); }
.btn.complete { background: var(--color-success); color: #052b14; }
.btn.complete.done { background: var(--color-surface-2); color: var(--color-text-dim); }
.row { display: flex; gap: var(--space-2); flex-wrap: wrap; margin-top: var(--space-3); }
.row .btn { flex: 1; min-width: 140px; }

/* ===== Day list ===== */
.phase-head {
  margin: var(--space-5) 0 var(--space-3);
  padding-left: var(--space-2);
  border-left: 3px solid var(--color-action);
}
.phase-head h3 { margin: 0; font-size: 16px; }
.phase-head small { color: var(--color-text-dim); }

.day-item {
  display: flex; align-items: center; gap: var(--space-3);
  padding: var(--space-4);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  margin-bottom: var(--space-2);
  cursor: pointer;
  min-height: 72px;
}
.day-item:active { transform: scale(0.99); }
.day-num {
  width: 44px; height: 44px; flex-shrink: 0;
  border-radius: 50%;
  background: var(--color-surface-2);
  display: flex; align-items: center; justify-content: center;
  font-weight: 800; font-size: 18px;
  border: 1px solid var(--color-border);
}
.day-item.done .day-num {
  background: var(--color-success);
  color: #052b14;
  border-color: var(--color-success);
}
.day-info { flex: 1; min-width: 0; }
.day-info h4 { margin: 0 0 4px; font-size: 15px; line-height: 1.4; }
.day-info small { color: var(--color-text-dim); font-size: 12px; }
.day-chev { color: var(--color-text-dim); }

/* ===== Resources view ===== */
.res-category { margin-bottom: var(--space-5); }
.res-category h3 {
  font-size: 14px; color: var(--color-text-dim);
  letter-spacing: 0.05em; text-transform: uppercase;
  margin: 0 0 var(--space-2);
}
.res-item {
  display: block;
  padding: var(--space-4);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  margin-bottom: var(--space-2);
  text-decoration: none;
  color: var(--color-text);
}
.res-item .res-name { font-weight: 700; }
.res-item .res-memo { font-size: 13px; color: var(--color-text-dim); margin-top: 4px; }

/* ===== Memo ===== */
.memo-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-5);
}
.memo-card textarea {
  width: 100%;
  min-height: 280px;
  background: var(--color-bg);
  color: var(--color-text);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: var(--space-3);
  font: inherit; resize: vertical;
  margin-top: var(--space-2);
}
.memo-card textarea:focus {
  outline: 2px solid var(--color-action);
  outline-offset: 2px;
}

/* ===== Modal ===== */
.day-modal {
  width: 100%; max-width: 760px; height: 92dvh;
  border: 0; padding: 0;
  background: var(--color-bg);
  color: var(--color-text);
  border-radius: 24px 24px 0 0;
  margin: auto auto 0;
  inset: auto 0 0 0;
}
.day-modal::backdrop { background: rgba(0,0,0,0.6); backdrop-filter: blur(4px); }
.modal-head {
  display: flex; align-items: flex-start; gap: var(--space-3);
  padding: var(--space-5);
  border-bottom: 1px solid var(--color-border);
  position: sticky; top: 0; background: var(--color-bg); z-index: 5;
}
.modal-head h2 { margin: 0; font-size: 20px; line-height: 1.4; }
.modal-head .close { margin-left: auto; }
.modal-body {
  padding: var(--space-4) var(--space-5) calc(env(safe-area-inset-bottom) + 80px);
  overflow-y: auto;
  max-height: calc(92dvh - 80px);
}

/* ===== Toast ===== */
.toast {
  position: fixed;
  bottom: calc(env(safe-area-inset-bottom) + 24px);
  left: 50%; transform: translateX(-50%) translateY(100px);
  background: var(--color-success);
  color: #052b14;
  padding: 12px 20px;
  border-radius: 999px;
  font-weight: 700; font-size: 14px;
  opacity: 0; transition: 0.3s;
  z-index: 100;
}
.toast.show { transform: translateX(-50%) translateY(0); opacity: 1; }

/* ===== Footer ===== */
.footer {
  text-align: center;
  color: var(--color-text-dim);
  padding: var(--space-5);
  font-size: 12px;
}

/* ===== 図解セクション ===== */
.diagram-section {
  margin: var(--space-4) 0;
  background: var(--color-surface-2);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
}
.diagram-label {
  padding: var(--space-2) var(--space-3);
  font-size: 12px; font-weight: 700; color: var(--color-action);
  letter-spacing: 0.08em; text-transform: uppercase;
  border-bottom: 1px solid var(--color-border);
}
.diagram-section svg { display: block; width: 100%; }
.ai-diagram {
  display: block; width: 100%;
  border-top: 1px solid var(--color-border);
  border-radius: 0 0 var(--radius-md) var(--radius-md);
}

/* ===== 課題ノート（モーダル内）===== */
.note-modal-section {
  margin-top: var(--space-5);
  padding: var(--space-4);
  background: rgba(108,140,255,0.05);
  border: 1px solid rgba(108,140,255,0.2);
  border-radius: var(--radius-md);
}
.note-modal-head {
  display: flex; justify-content: space-between; align-items: center;
  font-size: 15px; font-weight: 700; margin-bottom: var(--space-2);
  color: var(--color-action);
}
.note-textarea {
  width: 100%;
  background: var(--color-bg);
  color: var(--color-text);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: var(--space-3);
  font: inherit; font-size: 15px;
  line-height: 1.65;
  resize: vertical;
}
.note-textarea:focus {
  outline: 2px solid var(--color-action);
  outline-offset: 2px;
}
.modal-note { min-height: 120px; }
.note-saved { font-size: 12px; color: var(--color-success); font-weight: 700; }
.note-actions { display: flex; align-items: center; gap: var(--space-2); margin-top: var(--space-2); }

/* ===== 課題ノートタブ ===== */
.notes-header { margin-bottom: var(--space-4); }
.notes-header h2 { margin: 0 0 var(--space-2); }

.note-day-item {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  margin-bottom: var(--space-2);
  overflow: hidden;
}
.note-day-head {
  display: flex; align-items: center; gap: var(--space-3);
  padding: var(--space-3) var(--space-4);
  cursor: pointer;
  min-height: 56px;
}
.note-day-head:active { background: var(--color-surface-2); }
.note-day-num {
  width: 40px; height: 40px; flex-shrink: 0;
  border-radius: 50%;
  background: var(--color-surface-2);
  border: 1px solid var(--color-border);
  display: flex; align-items: center; justify-content: center;
  font-size: 13px; font-weight: 800; color: var(--color-action);
}
.note-day-num.done { background: var(--color-success); color: #052b14; border-color: var(--color-success); }
.note-day-title { flex: 1; font-size: 14px; line-height: 1.4; }
.note-day-status { font-size: 16px; }

.note-day-body {
  display: none;
  padding: var(--space-3) var(--space-4) var(--space-4);
  border-top: 1px solid var(--color-border);
}
.note-day-item.open .note-day-body { display: block; }

/* 今日タブのノートプレビュー */
.note-preview {
  margin-top: var(--space-3);
  padding: var(--space-3) var(--space-4);
  background: rgba(108,140,255,0.06);
  border: 1px solid rgba(108,140,255,0.18);
  border-radius: var(--radius-sm);
}
.note-badge {
  font-size: 11px; font-weight: 700; color: var(--color-action);
  letter-spacing: 0.05em; text-transform: uppercase;
}
.note-preview p { margin: 4px 0 0; font-size: 13px; color: var(--color-text-dim); line-height: 1.5; }

/* memo-card は既存だが再定義不要 */
.memo-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-5);
}
.memo-card h3 { margin: 0 0 var(--space-2); }
.memo-card textarea {
  width: 100%; min-height: 200px;
  background: var(--color-bg); color: var(--color-text);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: var(--space-3);
  font: inherit; resize: vertical;
  margin-top: var(--space-2);
}
.memo-card textarea:focus { outline: 2px solid var(--color-action); outline-offset: 2px; }

/* ===== Responsive ===== */
@media (min-width: 640px) {
  .main { padding: var(--space-5); }
  .card { padding: var(--space-6); }
}
@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; animation: none !important; }
}