/* ===== CSS Variables ===== */
:root {
  --bg: #111214;
  --bg2: #181a1e;
  --bg3: #1f2128;
  --border: #2a2d35;
  --text: #e8eaf0;
  --text-sub: #7a7f8e;
  --text-muted: #4a4f5e;
  --accent: #6c8fff;
  --radius: 12px;
  --radius-sm: 8px;
  --header-h: 56px;
  --nav-h: 48px;
  --legend-h: 36px;

  /* 科目カラー */
  --c-japanese: #f472b6;
  --c-math:     #38bdf8;
  --c-english:  #a78bfa;
  --c-physics:  #4ade80;
  --c-chemistry:#60a5fa;
  --c-social:   #fbbf24;
  --c-info:     #9ca3af;
}

/* ===== Reset ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html, body {
  height: 100%;
  font-family: 'Noto Sans JP', sans-serif;
  background: var(--bg);
  color: var(--text);
  overflow: hidden;
}
button { cursor: pointer; font-family: inherit; }
input, textarea { font-family: inherit; }
.hidden { display: none !important; }

/* ===== Login ===== */
#login-screen {
  position: fixed; inset: 0;
  display: flex; align-items: center; justify-content: center;
  background: radial-gradient(ellipse at 40% 50%, #1a1f3a 0%, #0a0b0f 60%);
  z-index: 999;
}
.login-card {
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 48px 40px;
  width: min(400px, 90vw);
  text-align: center;
  box-shadow: 0 24px 80px rgba(0,0,0,0.6);
  animation: fadeUp 0.5s ease;
}
.login-logo { font-size: 40px; margin-bottom: 12px; display: block; }
.login-card h1 {
  font-family: 'Playfair Display', serif;
  font-size: 2rem;
  letter-spacing: 0.05em;
  margin-bottom: 8px;
}
.login-card h1 span { color: var(--accent); }
.login-sub { color: var(--text-sub); font-size: 0.85rem; margin-bottom: 28px; }
.login-card input {
  width: 100%; padding: 12px 16px;
  background: var(--bg3); border: 1px solid var(--border);
  border-radius: var(--radius-sm); color: var(--text);
  font-size: 1rem; outline: none;
  transition: border-color 0.2s;
  margin-bottom: 16px;
}
.login-card input:focus { border-color: var(--accent); }
.login-card button {
  width: 100%; padding: 13px;
  background: var(--accent); color: #fff;
  border: none; border-radius: var(--radius-sm);
  font-size: 0.95rem; font-weight: 700;
  letter-spacing: 0.05em;
  transition: opacity 0.2s, transform 0.1s;
}
.login-card button:hover { opacity: 0.9; transform: translateY(-1px); }
.login-card button:active { transform: translateY(0); }

/* ===== App Layout ===== */
#app {
  display: flex; flex-direction: column;
  height: 100vh; height: 100dvh;
  overflow: hidden;
}

/* ===== Header ===== */
header {
  height: var(--header-h);
  display: flex; align-items: center; justify-content: space-between;
  padding: 0 16px;
  background: var(--bg2);
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
  z-index: 10;
}
.header-left { display: flex; align-items: center; gap: 10px; }
.header-logo { font-size: 20px; }
.header-title {
  font-family: 'Playfair Display', serif;
  font-size: 1.1rem;
  letter-spacing: 0.05em;
  color: var(--text);
}
.header-right { display: flex; align-items: center; gap: 10px; }
.user-badge {
  background: var(--bg3);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 4px 12px;
  font-size: 0.8rem;
  color: var(--text-sub);
  font-weight: 500;
}
.icon-btn {
  width: 36px; height: 36px;
  background: var(--accent);
  border: none; border-radius: 8px;
  display: flex; align-items: center; justify-content: center;
  color: white;
  transition: opacity 0.2s, transform 0.1s;
}
.icon-btn svg { width: 18px; height: 18px; }
.icon-btn:hover { opacity: 0.85; transform: scale(1.05); }

/* ===== Date Nav ===== */
.date-nav {
  height: var(--nav-h);
  display: flex; align-items: center; gap: 8px;
  padding: 0 12px;
  background: var(--bg2);
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
  overflow-x: auto;
}
.nav-btn {
  width: 30px; height: 30px;
  background: var(--bg3); border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  display: flex; align-items: center; justify-content: center;
  color: var(--text-sub); flex-shrink: 0;
  transition: background 0.15s;
}
.nav-btn svg { width: 16px; height: 16px; }
.nav-btn:hover { background: var(--border); color: var(--text); }
.date-range-label {
  font-family: 'DM Mono', monospace;
  font-size: 0.78rem;
  color: var(--text-sub);
  white-space: nowrap;
  min-width: 120px; text-align: center;
}
.today-btn {
  background: transparent; border: 1px solid var(--border);
  color: var(--text-sub); border-radius: var(--radius-sm);
  padding: 4px 10px; font-size: 0.78rem;
  flex-shrink: 0;
  transition: all 0.15s;
}
.today-btn:hover { border-color: var(--accent); color: var(--accent); }
.col-switcher {
  display: flex; align-items: center; gap: 4px;
  margin-left: auto;
  font-size: 0.75rem; color: var(--text-muted);
  flex-shrink: 0;
}
.col-btn {
  background: var(--bg3); border: 1px solid var(--border);
  color: var(--text-sub); border-radius: 6px;
  width: 26px; height: 24px;
  font-size: 0.75rem;
  transition: all 0.15s;
}
.col-btn.active, .col-btn:hover {
  background: var(--accent); border-color: var(--accent);
  color: white;
}

/* ===== Columns ===== */
.columns-wrap {
  flex: 1;
  display: flex;
  overflow: hidden;
  gap: 0;
}
.day-column {
  flex: 1;
  display: flex; flex-direction: column;
  border-right: 1px solid var(--border);
  min-width: 0;
  overflow: hidden;
}
.day-column:last-child { border-right: none; }

.day-header {
  padding: 10px 12px 8px;
  background: var(--bg2);
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
  display: flex; align-items: baseline; justify-content: space-between;
  gap: 6px;
}
.day-date {
  font-family: 'DM Mono', monospace;
  font-size: 0.78rem;
  color: var(--text-sub);
}
.day-weekday {
  font-size: 0.85rem;
  font-weight: 700;
}
.day-label {
  font-size: 0.7rem;
  padding: 2px 7px;
  border-radius: 10px;
  margin-left: auto;
  white-space: nowrap;
}
.day-label.today { background: var(--accent); color: white; }
.day-label.yesterday { background: var(--bg3); color: var(--text-sub); border: 1px solid var(--border); }
.day-label.tomorrow { background: #1a2a1a; color: #4ade80; border: 1px solid #2a4a2a; }

.day-column.is-today .day-header {
  background: #12172a;
  border-bottom-color: var(--accent);
}
.day-column.is-today .day-weekday { color: var(--accent); }

.day-tasks {
  flex: 1;
  overflow-y: auto;
  padding: 8px;
  display: flex; flex-direction: column; gap: 6px;
}
.day-tasks::-webkit-scrollbar { width: 4px; }
.day-tasks::-webkit-scrollbar-track { background: transparent; }
.day-tasks::-webkit-scrollbar-thumb { background: var(--border); border-radius: 2px; }

/* ===== Task Card ===== */
.task-card {
  background: var(--bg3);
  border-radius: var(--radius-sm);
  border-left: 3px solid;
  padding: 8px 46px 8px 10px;
  cursor: pointer;
  transition: transform 0.12s, background 0.12s, opacity 0.2s;
  position: relative;
  animation: fadeIn 0.2s ease;
}
.task-card:hover { transform: translateX(2px); background: #25282f; }
.task-card.done { opacity: 0.45; }
.task-card.done .task-content { text-decoration: line-through; }

.task-subject-tag {
  font-size: 0.65rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  margin-bottom: 4px;
  text-transform: uppercase;
}
.task-content {
  font-size: 0.85rem;
  line-height: 1.4;
  color: var(--text);
  word-break: break-all;
}
.task-meta {
  display: flex; align-items: center; gap: 6px;
  margin-top: 5px;
}
.task-assignee {
  font-size: 0.7rem; color: var(--text-sub);
  background: var(--bg2); border-radius: 4px;
  padding: 1px 6px;
}
.task-memo {
  font-size: 0.7rem; color: var(--text-muted);
  overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
  max-width: 100%;
}
.task-check {
  position: absolute; top: 50%; right: 10px;
  transform: translateY(-50%);
  width: 28px; height: 28px;
  border-radius: 5px;
  border: 2px solid;
  background: transparent;
  display: flex; align-items: center; justify-content: center;
  flex-shrink: 0;
  transition: background 0.15s, transform 0.1s;
  -webkit-tap-highlight-color: transparent;
  touch-action: manipulation;
}
.task-check::before {
  content: '';
  position: absolute;
  inset: -10px;
}
.task-check:active {
  transform: translateY(-50%) scale(0.88);
}
.task-card.done .task-check {
  background: currentColor;
}
.task-card.done .task-check::after {
  content: '';
  width: 11px; height: 7px;
  border-left: 2.5px solid var(--bg2);
  border-bottom: 2.5px solid var(--bg2);
  transform: rotate(-45deg) translate(1px, -1px);
  display: block;
}

/* 科目ごとのカラースタイル */
[data-subject="japanese"] { border-left-color: var(--c-japanese) !important; }
[data-subject="math"]     { border-left-color: var(--c-math) !important; }
[data-subject="english"]  { border-left-color: var(--c-english) !important; }
[data-subject="physics"]  { border-left-color: var(--c-physics) !important; }
[data-subject="chemistry"]{ border-left-color: var(--c-chemistry) !important; }
[data-subject="social"]   { border-left-color: var(--c-social) !important; }
[data-subject="info"]     { border-left-color: var(--c-info) !important; }

.task-subject-tag[data-subject="japanese"] { color: var(--c-japanese); }
.task-subject-tag[data-subject="math"]     { color: var(--c-math); }
.task-subject-tag[data-subject="english"]  { color: var(--c-english); }
.task-subject-tag[data-subject="physics"]  { color: var(--c-physics); }
.task-subject-tag[data-subject="chemistry"]{ color: var(--c-chemistry); }
.task-subject-tag[data-subject="social"]   { color: var(--c-social); }
.task-subject-tag[data-subject="info"]     { color: var(--c-info); }

.task-check[data-subject="japanese"] { border-color: var(--c-japanese); color: var(--c-japanese); }
.task-check[data-subject="math"]     { border-color: var(--c-math); color: var(--c-math); }
.task-check[data-subject="english"]  { border-color: var(--c-english); color: var(--c-english); }
.task-check[data-subject="physics"]  { border-color: var(--c-physics); color: var(--c-physics); }
.task-check[data-subject="chemistry"]{ border-color: var(--c-chemistry); color: var(--c-chemistry); }
.task-check[data-subject="social"]   { border-color: var(--c-social); color: var(--c-social); }
.task-check[data-subject="info"]     { border-color: var(--c-info); color: var(--c-info); }

/* ===== Legend ===== */
.legend {
  height: var(--legend-h);
  display: flex; align-items: center; gap: 12px;
  padding: 0 12px;
  background: var(--bg2);
  border-top: 1px solid var(--border);
  overflow-x: auto;
  flex-shrink: 0;
}
.legend::-webkit-scrollbar { display: none; }
.legend-item {
  display: flex; align-items: center; gap: 5px;
  font-size: 0.72rem; color: var(--text-sub);
  white-space: nowrap;
  flex-shrink: 0;
}
.legend-item .dot {
  width: 8px; height: 8px; border-radius: 50%;
}
.legend-item[data-subject="japanese"] .dot { background: var(--c-japanese); }
.legend-item[data-subject="math"] .dot     { background: var(--c-math); }
.legend-item[data-subject="english"] .dot  { background: var(--c-english); }
.legend-item[data-subject="physics"] .dot  { background: var(--c-physics); }
.legend-item[data-subject="chemistry"] .dot{ background: var(--c-chemistry); }
.legend-item[data-subject="social"] .dot   { background: var(--c-social); }
.legend-item[data-subject="info"] .dot     { background: var(--c-info); }

/* ===== Modal ===== */
.modal-overlay {
  position: fixed; inset: 0;
  background: rgba(0,0,0,0.6);
  backdrop-filter: blur(4px);
  display: flex; align-items: flex-end; justify-content: center;
  z-index: 100;
  animation: fadeIn 0.15s ease;
}
@media (min-width: 600px) {
  .modal-overlay { align-items: center; }
}
.modal-card {
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: 20px 20px 0 0;
  width: 100%;
  max-width: 560px;
  max-height: 90dvh;
  overflow: hidden;
  display: flex; flex-direction: column;
  animation: slideUp 0.2s ease;
}
@media (min-width: 600px) {
  .modal-card { border-radius: 20px; }
}
.modal-header {
  display: flex; align-items: center; justify-content: space-between;
  padding: 18px 20px 14px;
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}
.modal-header h2 { font-size: 1rem; font-weight: 700; }
.close-btn {
  background: var(--bg3); border: 1px solid var(--border);
  color: var(--text-sub); border-radius: 50%;
  width: 28px; height: 28px; font-size: 0.75rem;
  display: flex; align-items: center; justify-content: center;
  transition: all 0.15s;
}
.close-btn:hover { border-color: #ff6b6b; color: #ff6b6b; }
.modal-body {
  flex: 1; overflow-y: auto;
  padding: 16px 20px;
  display: flex; flex-direction: column; gap: 14px;
}
.modal-footer {
  display: flex; justify-content: flex-end; gap: 8px;
  padding: 12px 20px 16px;
  border-top: 1px solid var(--border);
  flex-shrink: 0;
}

/* Form */
.form-group { display: flex; flex-direction: column; gap: 6px; }
.form-group label { font-size: 0.78rem; color: var(--text-sub); font-weight: 500; }
.form-group input,
.form-group textarea {
  background: var(--bg3); border: 1px solid var(--border);
  border-radius: var(--radius-sm); color: var(--text);
  padding: 9px 12px; font-size: 0.9rem; outline: none;
  transition: border-color 0.2s;
  resize: none;
}
.form-group input:focus,
.form-group textarea:focus { border-color: var(--accent); }

/* Subject selector */
.subject-selector {
  display: flex; flex-wrap: wrap; gap: 6px;
}
.subj-btn {
  padding: 5px 12px;
  border-radius: 20px;
  border: 1.5px solid var(--border);
  background: var(--bg3);
  color: var(--text-sub);
  font-size: 0.82rem; font-weight: 500;
  transition: all 0.15s;
}
.subj-btn[data-subject="japanese"].active { border-color: var(--c-japanese); background: rgba(244,114,182,0.12); color: var(--c-japanese); }
.subj-btn[data-subject="math"].active     { border-color: var(--c-math); background: rgba(56,189,248,0.12); color: var(--c-math); }
.subj-btn[data-subject="english"].active  { border-color: var(--c-english); background: rgba(167,139,250,0.12); color: var(--c-english); }
.subj-btn[data-subject="physics"].active  { border-color: var(--c-physics); background: rgba(74,222,128,0.12); color: var(--c-physics); }
.subj-btn[data-subject="chemistry"].active{ border-color: var(--c-chemistry); background: rgba(96,165,250,0.12); color: var(--c-chemistry); }
.subj-btn[data-subject="social"].active   { border-color: var(--c-social); background: rgba(251,191,36,0.12); color: var(--c-social); }
.subj-btn[data-subject="info"].active     { border-color: var(--c-info); background: rgba(156,163,175,0.12); color: var(--c-info); }

/* Modal buttons */
.cancel-btn {
  background: var(--bg3); border: 1px solid var(--border);
  color: var(--text-sub); border-radius: var(--radius-sm);
  padding: 8px 18px; font-size: 0.88rem;
  transition: all 0.15s;
}
.cancel-btn:hover { border-color: var(--text-muted); }
.submit-btn {
  background: var(--accent); border: none;
  color: white; border-radius: var(--radius-sm);
  padding: 8px 20px; font-size: 0.88rem; font-weight: 700;
  transition: opacity 0.15s, transform 0.1s;
}
.submit-btn:hover { opacity: 0.88; transform: translateY(-1px); }
.delete-btn {
  background: transparent; border: 1px solid #55282a;
  color: #ff6b6b; border-radius: var(--radius-sm);
  padding: 8px 18px; font-size: 0.88rem;
  transition: all 0.15s;
  margin-right: auto;
}
.delete-btn:hover { background: rgba(255,107,107,0.1); }

/* 詳細モーダル内のステータス切り替え */
.status-row {
  display: flex; gap: 8px;
}
.status-btn {
  flex: 1; padding: 8px;
  border-radius: var(--radius-sm);
  border: 1.5px solid var(--border);
  background: var(--bg3); color: var(--text-sub);
  font-size: 0.82rem; font-weight: 500;
  transition: all 0.15s;
}
.status-btn.active-todo { border-color: var(--accent); background: rgba(108,143,255,0.1); color: var(--accent); }
.status-btn.active-done { border-color: var(--c-physics); background: rgba(74,222,128,0.1); color: var(--c-physics); }

/* ===== Countdown Badges ===== */
#countdown-badges {
  display: flex; gap: 6px; align-items: center;
}
.countdown-badge {
  display: flex; flex-direction: column; align-items: center;
  background: var(--bg3);
  border: 1px solid color-mix(in srgb, var(--exam-color) 40%, transparent);
  border-radius: 6px;
  padding: 3px 10px;
  line-height: 1.2;
  min-width: 72px;
}
.cd-label {
  font-size: 0.6rem;
  color: var(--exam-color);
  font-weight: 700;
  letter-spacing: 0.04em;
  white-space: nowrap;
}
.cd-days {
  font-size: 0.7rem;
  color: var(--text-sub);
  white-space: nowrap;
}
.cd-days b {
  font-family: 'DM Mono', monospace;
  color: var(--exam-color);
  font-size: 0.85rem;
  margin: 0 1px;
}
/* スマホでは小さく */
@media (max-width: 599px) {
  .countdown-badge { min-width: 60px; padding: 2px 7px; }
  .cd-label { font-size: 0.55rem; }
  .cd-days { font-size: 0.65rem; }
  .cd-days b { font-size: 0.78rem; }
}

/* day-tasks 空白タップのヒント */
.day-tasks:empty::after {
  content: '＋ タスクを追加';
  display: flex; align-items: center; justify-content: center;
  height: 60px;
  color: var(--text-muted);
  font-size: 0.78rem;
  border: 1.5px dashed var(--border);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: border-color 0.15s, color 0.15s;
}
.day-tasks:empty:hover::after {
  border-color: var(--accent);
  color: var(--accent);
}

/* ===== Animations ===== */
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(20px); }
  to   { opacity: 1; transform: translateY(0); }
}
@keyframes slideUp {
  from { transform: translateY(30px); opacity: 0; }
  to   { transform: translateY(0); opacity: 1; }
}
@keyframes fadeIn {
  from { opacity: 0; }
  to   { opacity: 1; }
}

/* ===== Responsive ===== */
/* スマホでは列切り替え非表示（常に1列） */
@media (max-width: 599px) {
  .col-switcher { display: none; }
}