:root {
  color-scheme: light;
  --green-950: #0d2f25;
  --green-900: #123c2f;
  --green-800: #18513e;
  --green-700: #236a51;
  --green-100: #dcebe4;
  --paper: #f3f1eb;
  --card: #fffefa;
  --ink: #17231e;
  --muted: #66736d;
  --line: #d6ddd8;
  --red: #a63831;
  --red-soft: #f8dfdc;
  --amber: #8b5c13;
  --amber-soft: #faedcc;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

* { box-sizing: border-box; }
html { background: var(--paper); }
body { margin: 0; min-height: 100vh; color: var(--ink); background: var(--paper); }
button, input { font: inherit; }
button { cursor: pointer; }
button:disabled { cursor: not-allowed; opacity: .65; }
.hidden { display: none !important; }

.login-page {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 24px;
  background:
    radial-gradient(circle at 10% 10%, rgba(255,255,255,.13), transparent 34%),
    linear-gradient(145deg, var(--green-950), var(--green-800));
}

.login-card {
  width: min(100%, 430px);
  padding: 30px;
  border-radius: 24px;
  background: var(--card);
  box-shadow: 0 24px 70px rgba(0,0,0,.28);
}

.login-brand, .header-brand { display: flex; align-items: center; gap: 14px; }
.login-brand img { width: 58px; height: 58px; object-fit: contain; }
.login-brand span, .header-brand span, .section-heading span, .class-card header span, dialog span {
  display: block;
  color: var(--green-700);
  font-size: .72rem;
  font-weight: 800;
  letter-spacing: .13em;
}
.login-brand h1 { margin: 3px 0 0; font-family: Georgia, serif; font-size: 1.75rem; line-height: 1.05; }
.login-intro { color: var(--muted); margin: 28px 0 20px; }
label { display: grid; gap: 7px; margin-bottom: 16px; }
label span { font-size: .84rem; font-weight: 750; }
input {
  width: 100%;
  min-height: 50px;
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 11px 13px;
  background: #fff;
  color: var(--ink);
}
input:focus { outline: 3px solid rgba(35,106,81,.18); border-color: var(--green-700); }

.primary-button, .save-button, .secondary-button, .menu-action, .icon-button {
  border: 0;
  border-radius: 12px;
  min-height: 46px;
  font-weight: 800;
}
.primary-button, .save-button { color: #fff; background: var(--green-800); padding: 12px 18px; }
.login-card .primary-button { width: 100%; margin-top: 4px; }
.login-card .remember-device {
  display: flex;
  flex-direction: row;
  align-items: center;
  gap: 10px;
  margin: 2px 0 14px;
  color: var(--muted);
  font-size: .92rem;
}
.login-card .remember-device input { width: 20px; height: 20px; margin: 0; }
.secondary-button { padding: 10px 14px; color: var(--green-900); background: #edf3ef; }
.message { min-height: 22px; margin: 14px 0; color: var(--red); font-weight: 650; }
.login-card small { display: block; margin-top: 22px; text-align: center; color: var(--muted); }

.app { min-height: 100vh; padding-bottom: calc(54px + env(safe-area-inset-bottom)); }
.app-header {
  position: sticky;
  z-index: 20;
  top: 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 76px;
  padding: 9px max(18px, env(safe-area-inset-left));
  color: #fff;
  background: var(--green-900);
  box-shadow: 0 2px 16px rgba(13,47,37,.22);
}
.header-brand img { width: 43px; height: 54px; object-fit: contain; }
.header-brand span { color: #bed6cb; font-size: .65rem; }
.header-brand h1 { margin: 0; font-family: Georgia, serif; font-size: 1.55rem; }
.icon-button { width: 48px; color: #fff; background: rgba(255,255,255,.12); font-size: 1.5rem; }

.user-menu {
  position: fixed;
  z-index: 30;
  top: 70px;
  right: 12px;
  width: min(310px, calc(100vw - 24px));
  padding: 15px;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: var(--card);
  box-shadow: 0 18px 50px rgba(13,47,37,.25);
}
.user-menu > div { padding: 4px 6px 12px; border-bottom: 1px solid var(--line); }
.user-menu strong, .user-menu span { display: block; }
.user-menu span { margin-top: 3px; color: var(--muted); font-size: .85rem; }
.menu-action { width: 100%; margin-top: 8px; padding: 10px; text-align: left; color: var(--green-900); background: #edf3ef; }
.menu-action.danger { color: var(--red); background: var(--red-soft); }

.content { width: min(100%, 760px); margin: 0 auto; padding: 18px 15px; }
.date-card, .class-card, .empty-card, .admin-card, .user-card {
  border: 1px solid var(--line);
  border-radius: 17px;
  background: var(--card);
  box-shadow: 0 8px 28px rgba(39,58,49,.07);
}
.date-card { display: grid; grid-template-columns: 1fr auto; gap: 7px 12px; padding: 15px; }
.date-card label { margin: 0; align-self: center; font-weight: 800; }
.date-card input { min-height: 44px; max-width: 180px; }
.date-card strong { grid-column: 1 / -1; color: var(--green-800); text-transform: capitalize; }

.session-tabs { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 8px; margin: 14px 0; }
.session-tabs:empty { display: none; }
.session-tabs button { display: grid; gap: 3px; min-height: 60px; padding: 9px; border: 1px solid var(--line); border-radius: 13px; color: var(--green-900); background: var(--card); }
.session-tabs button.active { color: #fff; border-color: var(--green-800); background: var(--green-800); }
.session-tabs span { font-size: .76rem; }

.class-card { overflow: hidden; }
.class-card > header { display: flex; align-items: center; justify-content: space-between; gap: 12px; padding: 17px; background: #edf3ef; }
.class-card h2 { margin: 2px 0 0; font-size: 1.15rem; }
.class-card header > strong { white-space: nowrap; }
.class-help { margin: 0; padding: 14px 17px; color: var(--muted); background: #faf8f2; }
.session-state { padding: 13px 17px; font-weight: 800; }
.session-state.registered { color: var(--green-800); background: var(--green-100); }
.session-state.cancelled { color: var(--amber); background: var(--amber-soft); }
.roster { display: grid; gap: 1px; background: var(--line); }
.roster-row {
  display: grid;
  grid-template-columns: 32px 1fr auto;
  align-items: center;
  gap: 10px;
  min-height: 59px;
  padding: 8px 14px;
  border: 0;
  text-align: left;
  background: #fff;
}
.row-number { display: grid; place-items: center; width: 28px; height: 28px; border-radius: 50%; color: var(--muted); background: #edf1ee; font-size: .78rem; font-weight: 800; }
.roster-row em { min-width: 88px; border-radius: 999px; padding: 7px 9px; text-align: center; font-size: .69rem; font-style: normal; font-weight: 900; letter-spacing: .04em; }
.roster-row.present em { color: var(--green-800); background: var(--green-100); }
.roster-row.absent { background: #fff7f6; }
.roster-row.absent em { color: var(--red); background: var(--red-soft); }
.counts { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1px; background: var(--line); border-top: 1px solid var(--line); }
.counts span { display: grid; gap: 1px; padding: 12px 5px; text-align: center; background: var(--card); color: var(--muted); font-size: .72rem; }
.counts strong { color: var(--ink); font-size: 1.25rem; }
.save-button { width: calc(100% - 28px); min-height: 56px; margin: 14px; font-size: .95rem; letter-spacing: .045em; }
.empty-card { display: grid; gap: 8px; padding: 34px 18px; text-align: center; }
.empty-card span { color: var(--muted); }

.section-heading { display: flex; align-items: center; justify-content: space-between; gap: 12px; margin-bottom: 14px; }
.section-heading h2 { margin: 3px 0 0; font-family: Georgia, serif; }
.admin-card { padding: 18px; }
.admin-card h3 { margin-top: 0; }
.form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 0 12px; }
.form-grid .full { grid-column: 1 / -1; }
.users-list { display: grid; gap: 10px; margin-top: 14px; }
.user-card { display: flex; align-items: center; justify-content: space-between; gap: 12px; padding: 15px; }
.user-card.inactive { opacity: .62; }
.user-card strong, .user-card span { display: block; }
.user-card span { margin-top: 4px; color: var(--muted); font-size: .82rem; }
.user-actions { display: flex; flex-wrap: wrap; justify-content: flex-end; gap: 7px; }
.danger-text { color: var(--red); }

footer { position: fixed; inset: auto 0 0; z-index: 10; padding: 11px 16px calc(11px + env(safe-area-inset-bottom)); text-align: center; color: #d7e6df; background: var(--green-950); font-size: .72rem; }

dialog { width: min(94vw, 510px); padding: 0; border: 0; border-radius: 20px; background: transparent; }
dialog::backdrop { background: rgba(8,25,19,.68); backdrop-filter: blur(2px); }
.dialog-card { padding: 24px; border-radius: 20px; background: var(--card); }
.dialog-card h2 { margin: 7px 0 12px; font-size: 1.25rem; }
.dialog-card p { color: var(--muted); line-height: 1.5; }
.dialog-actions { display: grid; grid-template-columns: 1fr 1.4fr; gap: 9px; margin-top: 20px; }

@media (max-width: 560px) {
  .login-page { padding: 14px; }
  .login-card { padding: 23px 19px; }
  .content { padding: 13px 10px; }
  .date-card { grid-template-columns: 1fr; }
  .date-card input { max-width: none; }
  .session-tabs { gap: 5px; }
  .class-card > header { align-items: flex-start; }
  .roster-row { grid-template-columns: 30px 1fr; }
  .roster-row em { grid-column: 2; justify-self: start; min-width: 78px; margin-top: -3px; padding: 5px 8px; }
  .counts span { font-size: .63rem; }
  .form-grid { grid-template-columns: 1fr; }
  .form-grid .full { grid-column: auto; }
  .user-card { align-items: flex-start; flex-direction: column; }
  .user-actions { justify-content: flex-start; }
  .dialog-actions { grid-template-columns: 1fr; }
}

@media (display-mode: standalone) {
  .app-header { padding-top: calc(9px + env(safe-area-inset-top)); }
}