/* STUDYtable Tutor Portal — Zen White, hand-written (no CDN framework). */
:root {
  --bg: #fafafc;
  --surface: #ffffff;
  --line: #f0f0f3;
  --line-strong: #e3e3e8;
  --text: #111113;
  --text-2: #6e6e73;
  --text-3: #99999f;
  --accent: #0066cc;
  --danger: #c2410c;
  --high-bg: #f2f9f5; --high-text: #0f6738; --high-line: #d4ebd9;
  --mid-bg: #fffdf5;  --mid-text: #8c5b05;  --mid-line: #faeec7;
  --low-bg: #f6f7f9;  --low-text: #4b5563;  --low-line: #e5e7eb;
  --mono: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  font-size: 13px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}
button { font: inherit; cursor: pointer; background: none; border: 0; color: inherit; padding: 0; }
input { font: inherit; color: inherit; }
input::placeholder { color: #b0b0b8; }
.hidden { display: none !important; }
.mono { font-family: var(--mono); }

/* Layout: generous side margins so cards feel grouped, not stretched */
.container { max-width: 1140px; margin: 0 auto; padding: 40px 24px 64px; }
@media (min-width: 768px)  { .container { padding: 56px 48px 80px; } }
@media (min-width: 1200px) { .container { padding: 56px 72px 96px; } }
.stack > * + * { margin-top: 32px; }

.panel {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 10px;
}

/* Quiet top bar */
.topbar {
  display: flex; align-items: center; justify-content: space-between;
  padding-bottom: 20px; margin-bottom: 32px; border-bottom: 1px solid var(--line);
}
.brand { display: flex; align-items: baseline; gap: 10px; }
.brand-name { font-size: 14px; font-weight: 600; letter-spacing: -0.01em; }
.brand-sep { color: var(--text-3); font-size: 11px; }
.brand-sub { font-size: 11px; letter-spacing: 0.08em; text-transform: uppercase; color: var(--text-2); font-weight: 500; }
.topbar-meta { font-size: 11px; color: var(--text-3); }

/* Grouped deck: ~32% identity card + ~68% metrics */
.deck { display: grid; grid-template-columns: 1fr; gap: 20px; align-items: stretch; }
@media (min-width: 1024px) { .deck { grid-template-columns: 4fr 8fr; } }
.id-card { padding: 24px; display: flex; flex-direction: column; justify-content: space-between; gap: 24px; }
.id-head { display: flex; align-items: center; gap: 14px; }
.avatar {
  width: 48px; height: 48px; border-radius: 50%; background: var(--text); color: #fff;
  display: flex; align-items: center; justify-content: center;
  font-family: var(--mono); font-size: 14px; font-weight: 500; flex-shrink: 0;
}
.avatar.lg { width: 64px; height: 64px; font-size: 20px; }
.id-name { font-size: 15px; font-weight: 600; letter-spacing: -0.01em; margin: 0; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.id-sub { font-size: 11px; color: var(--text-3); margin-top: 2px; }
.id-meta { padding-top: 12px; border-top: 1px solid var(--line); font-size: 12px; color: var(--text-2); }
.id-meta .mono { font-size: 11px; color: var(--text-3); }
.id-foot { padding-top: 16px; border-top: 1px solid var(--line); }

.metrics { padding: 20px; display: flex; flex-direction: column; justify-content: space-between; gap: 14px; }
@media (min-width: 640px) { .metrics { padding: 24px; } }
.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.tile { padding: 14px; border-radius: 8px; background: var(--bg); border: 1px solid var(--line); }
.tile-head { display: flex; align-items: center; justify-content: space-between; gap: 8px; }
.label { font-size: 10.5px; font-weight: 500; letter-spacing: 0.05em; text-transform: uppercase; color: var(--text-3); }
.tile-value { font-family: var(--mono); font-size: 18px; font-weight: 600; margin-top: 4px; }
.tile-note { font-size: 11px; color: var(--text-2); margin-top: 2px; }
.tone-high { color: var(--high-text); }
.tone-mid { color: var(--mid-text); }
.tone-low { color: var(--low-text); }

.add-strip {
  width: 100%; text-align: left; padding: 14px; border-radius: 8px;
  background: var(--bg); border: 1px dashed #d1d1d6;
  display: flex; align-items: center; justify-content: space-between; gap: 12px;
  transition: border-color .15s ease, background .15s ease;
}
.add-strip:hover { border-color: var(--text); background: #fff; }
.add-strip:disabled { cursor: not-allowed; opacity: .55; }
.add-strip .plus {
  width: 32px; height: 32px; border-radius: 50%; background: var(--text); color: #fff;
  display: flex; align-items: center; justify-content: center; font-family: var(--mono); font-weight: 600; flex-shrink: 0;
}
.add-strip-title { font-size: 12px; font-weight: 600; display: block; }
.add-strip-sub { font-size: 11px; color: var(--text-2); }

/* Gauge */
.gauge { height: 4px; background: var(--line); border-radius: 999px; overflow: hidden; }
.gauge > div { height: 100%; background: var(--text); border-radius: 999px; transition: width .3s ease; }
.gauge-legend { display: flex; justify-content: space-between; font-family: var(--mono); font-size: 10px; color: var(--text-3); margin-top: 6px; }

/* Pills */
.pill {
  display: inline-flex; align-items: center; padding: 2px 7px; border-radius: 4px;
  font-size: 11.5px; font-weight: 500; border: 1px solid transparent; white-space: nowrap;
}
.pill-high { background: var(--high-bg); color: var(--high-text); border-color: var(--high-line); }
.pill-mid  { background: var(--mid-bg);  color: var(--mid-text);  border-color: var(--mid-line); }
.pill-low  { background: var(--low-bg);  color: var(--low-text);  border-color: var(--low-line); }

/* Buttons & links */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 6px;
  padding: 8px 16px; border-radius: 6px; background: var(--text); color: #fff;
  font-size: 12px; font-weight: 500; transition: background .15s ease, opacity .15s ease;
}
.btn:hover { background: #000; }
.btn:disabled { opacity: .4; cursor: not-allowed; }
.btn-ghost {
  padding: 6px 14px; border-radius: 6px; border: 1px solid var(--line-strong);
  font-size: 12px; font-weight: 500; transition: background .15s ease, border-color .15s ease;
}
.btn-ghost:hover { background: var(--bg); }
.btn-danger { color: var(--danger); }
.btn-danger:hover { border-color: var(--danger); background: #fff7f3; }
.link { font-size: 12px; font-weight: 500; transition: color .15s ease; }
.link:hover { color: var(--accent); }
.link-muted { color: var(--text-2); }
.link-muted:hover { color: var(--text); }

/* Toolbar */
.toolbar { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 12px; }
.field {
  padding: 7px 12px; border-radius: 6px; border: 1px solid var(--line-strong); background: #fff;
  font-size: 12px; outline: none; transition: border-color .15s ease;
}
.field:focus { border-color: var(--text); }
.field[disabled] { background: var(--bg); color: var(--text-3); border-color: var(--line); }
.search { width: 280px; max-width: 100%; }
select.field { padding-right: 28px; }

/* Tables */
.table-wrap { overflow-x: auto; }
table { width: 100%; border-collapse: collapse; text-align: left; }
thead tr { background: var(--bg); border-bottom: 1px solid var(--line); }
th { padding: 12px 16px; font-size: 10.5px; font-weight: 600; letter-spacing: 0.06em; text-transform: uppercase; color: var(--text-3); white-space: nowrap; }
td { padding: 14px 16px; font-size: 12px; border-top: 1px solid var(--line); vertical-align: middle; }
th:first-child, td:first-child { padding-left: 24px; }
th:last-child, td:last-child { padding-right: 24px; }
tbody tr:first-child td { border-top: 0; }
tr.clickable { cursor: pointer; transition: background .12s ease; }
tr.clickable:hover { background: #fcfcfd; }
.cell-name { font-weight: 600; }
.cell-sub { font-size: 11px; color: var(--text-3); }
.t-right { text-align: right; }
.empty { padding: 56px 24px; text-align: center; color: var(--text-2); }
.empty-title { font-size: 13px; font-weight: 600; color: var(--text); margin-bottom: 4px; }
.footnote { font-size: 11px; color: var(--text-3); text-align: center; }

.section-head { padding: 16px 24px; border-bottom: 1px solid var(--line); display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 8px; }
.section-title { font-size: 12px; font-weight: 600; letter-spacing: 0.06em; text-transform: uppercase; }
.section-sub { font-size: 11px; color: var(--text-2); margin-top: 2px; }
.legend { display: flex; gap: 8px; flex-wrap: wrap; }

.crumbs { display: flex; align-items: center; justify-content: space-between; }

/* Profile page */
.profile-head { display: flex; align-items: center; gap: 20px; }
.profile-name { font-size: 22px; font-weight: 600; letter-spacing: -0.02em; margin: 0; }
.profile-sub { font-size: 12px; color: var(--text-2); margin-top: 4px; }
.profile-grid { display: grid; grid-template-columns: 1fr; gap: 24px; }
@media (min-width: 768px) { .profile-grid { grid-template-columns: 2fr 1fr; } }
.form-card { padding: 28px; }
.form-card > * + * { margin-top: 20px; }
.form-row { display: grid; grid-template-columns: 1fr; gap: 16px; }
@media (min-width: 640px) { .form-row { grid-template-columns: 1fr 1fr; } }
.form-label { display: block; font-size: 11px; font-weight: 500; text-transform: uppercase; letter-spacing: .04em; color: var(--text-2); margin-bottom: 4px; }
.form-card .field { width: 100%; padding: 9px 12px; }
.locked { display: flex; justify-content: space-between; align-items: center; padding: 9px 12px; border-radius: 6px; border: 1px solid var(--line); background: var(--bg); font-size: 12px; font-weight: 500; }
.locked small { font-size: 10px; color: var(--text-3); font-weight: 400; }
.form-foot { padding-top: 16px; border-top: 1px solid var(--line); display: flex; align-items: center; justify-content: space-between; gap: 12px; }
.kv { display: flex; justify-content: space-between; padding: 8px 0; border-bottom: 1px solid var(--line); font-size: 12px; }
.kv:last-child { border-bottom: 0; }
.kv span:first-child { color: var(--text-2); }
.side-card { padding: 24px; }
.side-card > * + * { margin-top: 14px; }
.side-note { font-size: 11px; color: var(--text-3); padding-top: 10px; border-top: 1px solid var(--line); }

/* Danger zone */
.danger { padding: 24px; display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 16px; }
.danger h4 { margin: 0; font-size: 12px; font-weight: 600; }
.danger p { margin: 2px 0 0; font-size: 11px; color: var(--text-2); }

/* Login */
.auth-wrap { min-height: 100vh; display: flex; align-items: center; justify-content: center; padding: 48px 24px; }
.auth-card { width: 100%; max-width: 360px; }
.auth-card > * + * { margin-top: 20px; }
.auth-title { font-size: 20px; font-weight: 600; letter-spacing: -0.02em; margin: 0; }
.auth-sub { font-size: 12px; color: var(--text-2); margin-top: 4px; }
.auth-card .field { width: 100%; padding: 10px 12px; font-size: 13px; }
.auth-card .btn { width: 100%; padding: 10px 16px; font-size: 13px; }
.auth-foot { font-size: 12px; color: var(--text-2); text-align: center; }
.auth-foot a { color: var(--text); font-weight: 500; }

/* Code / PIN boxes */
.boxes { display: flex; align-items: center; justify-content: center; gap: 8px; }
.box {
  width: 40px; height: 46px; text-align: center; font-family: var(--mono); font-size: 18px; font-weight: 600;
  border: 1px solid var(--line-strong); border-radius: 6px; background: #fff; outline: none;
  transition: border-color .15s ease, box-shadow .15s ease; text-transform: uppercase;
}
.box:focus { border-color: var(--text); box-shadow: 0 0 0 2px rgba(17,17,19,.08); }
.box-sep { color: var(--text-3); font-family: var(--mono); }

.status { font-size: 12px; min-height: 18px; }
.status.error { color: var(--danger); }
.status.ok { color: var(--high-text); }

/* Modal */
.modal { position: fixed; inset: 0; z-index: 50; background: rgba(17,17,19,.25); backdrop-filter: blur(3px); display: flex; align-items: center; justify-content: center; padding: 16px; }
.modal-card { background: #fff; border: 1px solid var(--line-strong); border-radius: 10px; width: 100%; max-width: 440px; overflow: hidden; }
.modal-head { padding: 20px 24px; border-bottom: 1px solid var(--line); display: flex; justify-content: space-between; align-items: flex-start; gap: 12px; }
.modal-title { margin: 0; font-size: 14px; font-weight: 600; }
.modal-sub { margin: 2px 0 0; font-size: 12px; color: var(--text-2); }
.modal-body { padding: 24px; }
.modal-body > * + * { margin-top: 18px; }
.modal-foot { padding: 16px 24px; border-top: 1px solid var(--line); background: var(--bg); display: flex; justify-content: flex-end; gap: 10px; }
.preview { padding: 14px; border-radius: 8px; border: 1px solid var(--line); background: var(--bg); }

/* Toast */
.toast { position: fixed; bottom: 28px; left: 50%; transform: translateX(-50%); background: var(--text); color: #fff; padding: 10px 16px; border-radius: 6px; font-size: 12px; z-index: 60; }

.loading { padding: 80px 0; text-align: center; color: var(--text-3); font-size: 12px; }