@import url("https://fonts.googleapis.com/css2?family=Noto+Sans+JP:wght@400;500;700;900&family=Zen+Old+Mincho:wght@500;700&display=swap");

:root {
  --bg: #eef3f8;
  --bg-soft: #f8fbff;
  --bg-grad-a: #dce8ff;
  --bg-grad-b: #ffecc8;
  --text: #17212d;
  --text-strong: #122033;
  --muted: #5b6a79;
  --card: #ffffff;
  --card-soft: #f4f8ff;
  --line: #d7e0ea;
  --line-strong: #c9d7e5;
  --input-bg: #fcfdff;
  --overlay: rgba(12, 24, 42, 0.34);
  --accent: #0066d6;
  --accent-strong: #0054b4;
  --accent-soft: #d8e8ff;
  --ok: #007f4f;
  --danger: #c7373f;
  --badge-announce-bg: #e1ecff;
  --badge-announce-text: #0a4ea8;
  --badge-question-bg: #ffe9d2;
  --badge-question-text: #905600;
  --shadow: 0 14px 30px rgba(12, 31, 58, 0.08);
}

body[data-theme="dark"] {
  --bg: #0b1220;
  --bg-soft: #131e30;
  --bg-grad-a: #142540;
  --bg-grad-b: #2f1f16;
  --text: #e7eef8;
  --text-strong: #f4f8ff;
  --muted: #a1b1c7;
  --card: #111a2b;
  --card-soft: #16243a;
  --line: #2a3b56;
  --line-strong: #35507a;
  --input-bg: #0f1727;
  --overlay: rgba(2, 5, 12, 0.64);
  --accent: #67a7ff;
  --accent-strong: #3d87eb;
  --accent-soft: #1f3555;
  --ok: #69d7aa;
  --danger: #ff8c94;
  --badge-announce-bg: #213b64;
  --badge-announce-text: #98c4ff;
  --badge-question-bg: #4a3520;
  --badge-question-text: #ffcb8a;
  --shadow: 0 16px 32px rgba(0, 0, 0, 0.35);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: radial-gradient(circle at 6% 10%, var(--bg-grad-a) 0, transparent 32%),
    radial-gradient(circle at 90% 22%, var(--bg-grad-b) 0, transparent 28%),
    var(--bg);
  color: var(--text);
  font-family: "Noto Sans JP", "Hiragino Kaku Gothic ProN", "Yu Gothic", sans-serif;
  line-height: 1.7;
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 20;
  backdrop-filter: blur(10px);
  border-bottom: 1px solid color-mix(in srgb, var(--line) 72%, transparent);
  background: color-mix(in srgb, var(--bg-soft) 86%, transparent);
}

.topbar-inner {
  max-width: 1220px;
  margin: 0 auto;
  padding: 1rem 1rem;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.brand-block {
  display: grid;
  gap: 0.2rem;
}

.brand-eyebrow {
  margin: 0;
  font-size: 0.8rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent);
  font-weight: 800;
}

h1,
h2,
h3,
h4 {
  margin: 0;
  color: var(--text-strong);
}

h1,
h2,
h3 {
  font-family: "Zen Old Mincho", "Hiragino Mincho ProN", "Yu Mincho", serif;
  letter-spacing: 0.01em;
}

h1 {
  font-size: clamp(1.35rem, 2.5vw, 2rem);
  line-height: 1.4;
  max-width: 24ch;
}

h2 {
  font-size: 1.25rem;
}

h3 {
  font-size: 1.05rem;
}

.brand-copy {
  margin: 0;
  color: var(--muted);
  font-size: 0.92rem;
}

.card-lite {
  border-radius: 14px;
  border: 1px solid var(--line);
  background: linear-gradient(140deg, var(--card), var(--card-soft));
  box-shadow: var(--shadow);
  padding: 0.75rem 0.85rem;
}

.compact-label {
  font-size: 0.82rem;
  color: var(--muted);
  display: grid;
  gap: 0.35rem;
}

.active-student-text {
  margin: 0.4rem 0 0;
  font-size: 0.82rem;
  color: var(--muted);
}

.topbar-actions {
  margin-top: 0.55rem;
  display: flex;
  gap: 0.4rem;
}

.login-page {
  min-height: 100vh;
  padding: 2.2rem 1rem 5rem;
  display: grid;
  place-items: center;
}

.login-shell {
  width: min(980px, 100%);
  display: grid;
  grid-template-columns: minmax(280px, 1fr) minmax(360px, 420px);
  gap: 1rem;
  align-items: center;
}

.login-brand {
  background: linear-gradient(150deg, color-mix(in srgb, var(--card) 85%, transparent), var(--card-soft));
  border: 1px solid var(--line);
  border-radius: 18px;
  box-shadow: var(--shadow);
  padding: 1.1rem 1.05rem;
}

.login-brand-note {
  margin: 0.9rem 0 0;
  padding: 0.48rem 0.58rem;
  border-radius: 10px;
  border: 1px solid var(--line);
  background: color-mix(in srgb, var(--accent-soft) 78%, var(--card));
  font-size: 0.82rem;
}

.login-card {
  border-radius: 18px;
  border: 1px solid var(--line);
  background: var(--card);
  box-shadow: var(--shadow);
  padding: 1rem;
  animation: rise 220ms ease-out;
}

.login-secondary {
  margin-top: 0.72rem;
  width: 100%;
}

.login-note {
  margin: 0.85rem 0 0;
  color: var(--muted);
  font-size: 0.83rem;
}

.app-shell {
  min-height: 100vh;
}

.ghost-btn {
  border: 1px solid var(--line-strong);
  background: transparent;
  color: var(--text);
  padding: 0.38rem 0.62rem;
  border-radius: 10px;
  font-weight: 700;
  font-size: 0.8rem;
}

.ghost-btn:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.page-grid {
  max-width: 1220px;
  margin: 1rem auto 0;
  padding: 0 1rem 4.9rem;
  display: grid;
  grid-template-columns: 280px minmax(420px, 1fr) 320px;
  gap: 1rem;
  align-items: start;
}

.left-column,
.center-column,
.right-column {
  display: grid;
  gap: 1rem;
}

.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 1rem;
  box-shadow: var(--shadow);
  animation: rise 260ms ease-out;
}

.dashboard-card {
  background: linear-gradient(150deg, var(--card) 0%, var(--card-soft) 100%);
}

.metrics {
  margin-top: 0.7rem;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.5rem;
}

.metrics article {
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 0.45rem 0.52rem;
  background: var(--card);
}

.metrics p {
  margin: 0;
  font-size: 0.74rem;
  color: var(--muted);
}

.metrics strong {
  font-size: 1.2rem;
  line-height: 1;
}

.helper-text {
  margin: 0.7rem 0 0;
  font-size: 0.85rem;
  color: var(--muted);
}

.section-head {
  display: grid;
  gap: 0.2rem;
}

.section-head p {
  margin: 0;
  font-size: 0.88rem;
  color: var(--muted);
}

.form-spacer {
  margin-top: 0.75rem;
}

.stack {
  display: grid;
  gap: 0.66rem;
}

label {
  display: grid;
  gap: 0.3rem;
  font-size: 0.88rem;
  color: color-mix(in srgb, var(--text) 92%, var(--muted));
}

input,
select,
textarea,
button {
  font: inherit;
  border-radius: 10px;
}

input,
select,
textarea {
  width: 100%;
  padding: 0.62rem 0.68rem;
  border: 1px solid var(--line-strong);
  background: var(--input-bg);
  color: var(--text);
}

input:focus,
select:focus,
textarea:focus,
button:focus-visible {
  outline: 2px solid color-mix(in srgb, var(--accent) 38%, transparent);
  outline-offset: 1px;
}

button {
  cursor: pointer;
  border: 1px solid transparent;
  background: linear-gradient(135deg, var(--accent), var(--accent-strong));
  color: #ffffff;
  padding: 0.58rem 0.88rem;
  font-weight: 700;
  transition: transform 0.12s ease, box-shadow 0.15s ease;
}

button:hover {
  transform: translateY(-1px);
  box-shadow: 0 8px 16px color-mix(in srgb, var(--accent) 24%, transparent);
}

button:disabled,
input:disabled,
select:disabled,
textarea:disabled {
  cursor: not-allowed;
  opacity: 0.58;
}

.chip-row {
  margin-top: 0.7rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
}

.chip {
  background: var(--card);
  border: 1px solid var(--line-strong);
  color: color-mix(in srgb, var(--text) 88%, var(--muted));
  padding: 0.36rem 0.8rem;
  border-radius: 999px;
  font-size: 0.84rem;
  font-weight: 700;
}

.chip.active {
  background: var(--accent-soft);
  border-color: color-mix(in srgb, var(--accent) 60%, var(--line-strong));
  color: var(--accent-strong);
}

.compose-form {
  margin-top: 0.8rem;
}

.is-hidden {
  display: none;
}

.inline-fields {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.6rem;
}

.feed-toolbar {
  margin-top: 0.7rem;
  display: flex;
  flex-wrap: wrap;
  align-items: end;
  gap: 0.65rem;
}

.feed-toolbar label {
  min-width: 140px;
}

.feed-list {
  margin-top: 0.8rem;
  display: grid;
  gap: 0.7rem;
}

.feed-item {
  border: 1px solid var(--line);
  border-radius: 14px;
  background: var(--card);
  padding: 0.75rem;
}

.feed-head {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.45rem;
}

.badge {
  font-size: 0.72rem;
  font-weight: 700;
  border-radius: 999px;
  padding: 0.16rem 0.5rem;
}

.badge.announcement {
  background: var(--badge-announce-bg);
  color: var(--badge-announce-text);
}

.badge.question {
  background: var(--badge-question-bg);
  color: var(--badge-question-text);
}

.feed-meta {
  margin: 0.22rem 0 0;
  color: var(--muted);
  font-size: 0.78rem;
}

.feed-body {
  margin: 0.48rem 0 0;
  white-space: pre-wrap;
  font-size: 0.92rem;
  line-height: 1.72;
}

.tag-row {
  margin-top: 0.5rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
}

.tag {
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 0.14rem 0.45rem;
  font-size: 0.74rem;
  color: color-mix(in srgb, var(--text) 75%, var(--muted));
  background: var(--bg-soft);
}

.tag.open {
  border-color: color-mix(in srgb, var(--ok) 45%, var(--line));
  color: var(--ok);
  background: color-mix(in srgb, var(--ok) 10%, var(--card));
}

.tag.closed {
  border-color: color-mix(in srgb, var(--danger) 35%, var(--line));
  color: var(--danger);
  background: color-mix(in srgb, var(--danger) 10%, var(--card));
}

.answers {
  margin-top: 0.65rem;
  border-top: 1px dashed var(--line);
  padding-top: 0.55rem;
  display: grid;
  gap: 0.45rem;
}

.answer {
  background: var(--bg-soft);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 0.42rem 0.52rem;
  font-size: 0.88rem;
}

.inline-answer-form {
  display: grid;
  gap: 0.45rem;
  margin-top: 0.3rem;
}

.inline-answer-form button {
  width: fit-content;
}

.mini-list,
.profile-view {
  margin-top: 0.7rem;
  display: grid;
  gap: 0.56rem;
}

.mini-item {
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--card);
  padding: 0.56rem 0.6rem;
}

.mini-title {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.45;
}

.mini-meta {
  margin: 0.2rem 0 0;
  color: var(--muted);
  font-size: 0.78rem;
}

.check-inline {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
}

.check-inline input {
  width: 1rem;
  height: 1rem;
}

.divider {
  margin: 1rem 0;
  border: 0;
  border-top: 1px solid var(--line);
}

.profile-head {
  display: flex;
  justify-content: space-between;
  align-items: end;
  gap: 0.6rem;
}

.empty {
  margin: 0;
  color: var(--muted);
  font-size: 0.87rem;
}

.status {
  position: fixed;
  bottom: 0.8rem;
  left: 1rem;
  right: 1rem;
  margin: 0;
  border-radius: 12px;
  border: 1px solid var(--line-strong);
  background: color-mix(in srgb, var(--card) 92%, transparent);
  color: var(--text);
  padding: 0.48rem 0.78rem;
  font-size: 0.84rem;
  box-shadow: var(--shadow);
  z-index: 40;
}

.status.error {
  border-color: color-mix(in srgb, var(--danger) 42%, var(--line));
  background: color-mix(in srgb, var(--danger) 10%, var(--card));
  color: color-mix(in srgb, var(--danger) 85%, var(--text));
}

@keyframes rise {
  from {
    opacity: 0;
    transform: translateY(5px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@media (max-width: 1120px) {
  .page-grid {
    grid-template-columns: minmax(250px, 0.88fr) 1.12fr;
  }

  .right-column {
    grid-column: 1 / -1;
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (max-width: 900px) {
  .login-shell {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 880px) {
  .page-grid {
    grid-template-columns: 1fr;
  }

  .right-column {
    grid-template-columns: 1fr;
  }

  .inline-fields {
    grid-template-columns: 1fr;
  }

  .topbar-inner {
    padding-top: 0.85rem;
    padding-bottom: 0.8rem;
  }

  .topbar-actions {
    width: 100%;
  }

  .ghost-btn {
    flex: 1;
  }
}