:root {
  --bg: #f7f8fb;
  --panel: rgba(255, 255, 255, 0.72);
  --panel-strong: rgba(255, 255, 255, 0.9);
  --line: rgba(20, 28, 45, 0.1);
  --line-strong: rgba(20, 28, 45, 0.18);
  --text: #111827;
  --muted: #657084;
  --subtle: #8a94a6;
  --brand: #19b89a;
  --brand-strong: #079078;
  --rose: #e955b8;
  --gold: #e7b84b;
  --danger: #d64747;
  --warning: #b7791f;
  --shadow: 0 20px 60px rgba(28, 39, 64, 0.12);
  --radius: 8px;
  font-family:
    Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI",
    "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  min-height: 100%;
  background: var(--bg);
  color: var(--text);
}

body {
  min-height: 100vh;
  margin: 0;
  overflow-x: hidden;
  background:
    radial-gradient(circle at 18% 8%, rgba(233, 85, 184, 0.2), transparent 30%),
    radial-gradient(circle at 82% 0%, rgba(25, 184, 154, 0.18), transparent 32%),
    linear-gradient(180deg, #fbfcff 0%, #f3f6fa 100%);
}

button,
input,
textarea,
select {
  font: inherit;
}

button {
  cursor: pointer;
}

img {
  max-width: 100%;
}

.ambient {
  position: fixed;
  inset: 0;
  pointer-events: none;
  opacity: 0.9;
  background:
    radial-gradient(circle at 42% 32%, rgba(231, 184, 75, 0.14), transparent 24%),
    radial-gradient(circle at 70% 72%, rgba(78, 146, 255, 0.12), transparent 30%);
  filter: blur(8px);
}

.app-shell {
  position: relative;
  width: min(1480px, calc(100% - 32px));
  min-height: 100vh;
  margin: 0 auto;
  padding: 24px 0 40px;
}

.glass-card {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--panel);
  box-shadow: var(--shadow);
  backdrop-filter: blur(18px) saturate(1.18);
  -webkit-backdrop-filter: blur(18px) saturate(1.18);
}

.muted {
  color: var(--muted);
}

.tiny {
  color: var(--subtle);
  font-size: 12px;
}

.loading-card {
  display: grid;
  place-items: center;
  gap: 14px;
  width: min(420px, 100%);
  margin: 20vh auto 0;
  padding: 34px;
}

.loading-card img {
  width: 210px;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 18px;
  padding: 12px 14px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  min-width: 0;
}

.brand-logo {
  width: 150px;
  height: 44px;
  object-fit: contain;
  object-position: left center;
}

.brand-title {
  min-width: 0;
}

.brand-title strong {
  display: block;
  font-size: 16px;
  line-height: 1.2;
}

.brand-title span {
  color: var(--muted);
  font-size: 12px;
}

.top-actions {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 10px;
  min-width: 0;
}

.pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  min-height: 30px;
  padding: 6px 10px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.65);
  color: var(--muted);
  font-size: 13px;
  white-space: nowrap;
}

.btn {
  min-height: 38px;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  background: rgba(255, 255, 255, 0.72);
  color: var(--text);
  padding: 9px 14px;
  transition:
    transform 0.16s ease,
    border-color 0.16s ease,
    background 0.16s ease;
}

.btn:hover {
  transform: translateY(-1px);
  border-color: rgba(25, 184, 154, 0.36);
  background: rgba(255, 255, 255, 0.95);
}

.btn.primary {
  border-color: rgba(7, 144, 120, 0.3);
  background: linear-gradient(135deg, var(--brand) 0%, #78e1c9 100%);
  color: #06241f;
  font-weight: 700;
}

.btn.danger {
  border-color: rgba(214, 71, 71, 0.25);
  color: var(--danger);
}

.btn.ghost {
  background: rgba(255, 255, 255, 0.42);
}

.btn.small {
  min-height: 32px;
  padding: 6px 10px;
  font-size: 13px;
}

.icon-btn {
  display: inline-grid;
  place-items: center;
  width: 38px;
  height: 38px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(255, 255, 255, 0.72);
}

.public-home {
  display: grid;
  gap: 18px;
}

.public-nav {
  position: sticky;
  top: 14px;
  z-index: 10;
  display: grid;
  grid-template-columns: minmax(240px, 1fr) auto minmax(220px, 1fr);
  align-items: center;
  gap: 18px;
  padding: 12px 14px;
}

.public-links {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
}

.public-links a {
  min-height: 34px;
  padding: 8px 12px;
  border-radius: 999px;
  color: var(--muted);
  font-size: 13px;
  font-weight: 700;
  text-decoration: none;
  transition:
    background 0.16s ease,
    color 0.16s ease;
}

.public-links a:hover {
  background: rgba(255, 255, 255, 0.7);
  color: var(--brand-strong);
}

.public-hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 390px;
  gap: 18px;
  align-items: stretch;
  min-height: 670px;
}

.public-hero-main {
  position: relative;
  display: grid;
  grid-template-columns: minmax(360px, 0.72fr) minmax(0, 0.92fr);
  grid-template-rows: 1fr auto;
  gap: 22px;
  overflow: hidden;
  padding: 48px;
}

.public-hero-main::before {
  content: "";
  position: absolute;
  width: 520px;
  height: 520px;
  left: 8%;
  top: 8%;
  border-radius: 50%;
  background:
    radial-gradient(circle at 36% 38%, rgba(255, 255, 255, 0.9), transparent 0 26%),
    radial-gradient(circle, rgba(25, 184, 154, 0.18), transparent 60%);
  filter: blur(8px);
}

.public-hero-main .hero-copy {
  position: relative;
  z-index: 1;
  max-width: 780px;
}

.public-hero-main .hero-copy h1 {
  max-width: 860px;
  font-size: clamp(35px, 3.4vw, 57px);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 28px;
}

.public-person {
  position: relative;
  z-index: 1;
  align-self: end;
  justify-self: start;
  grid-column: 1;
  grid-row: 1;
  width: min(460px, 100%);
  max-height: 560px;
  object-fit: contain;
  filter: drop-shadow(0 28px 38px rgba(19, 31, 54, 0.2));
}

.public-hero-main .hero-copy {
  grid-column: 2;
  grid-row: 1;
}

.hero-metrics {
  position: relative;
  z-index: 1;
  grid-column: 1 / -1;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
}

.hero-metrics div {
  min-height: 114px;
  padding: 18px;
  border: 1px solid rgba(20, 28, 45, 0.08);
  border-radius: var(--radius);
  background: rgba(255, 255, 255, 0.58);
}

.hero-metrics strong {
  display: block;
  margin-bottom: 8px;
  font-size: 34px;
  line-height: 1;
}

.hero-metrics span {
  color: var(--muted);
  font-size: 13px;
}

.public-section {
  padding-top: 24px;
}

.section-kicker {
  margin-bottom: 10px;
  color: var(--brand-strong);
  font-size: 13px;
  font-weight: 900;
}

.public-bento {
  display: grid;
  grid-template-columns: 1.08fr 1.22fr 0.9fr;
  gap: 14px;
}

.bento-feature {
  min-height: 220px;
  padding: 22px;
}

.bento-feature:nth-child(2) {
  min-height: 300px;
}

.bento-feature:nth-child(4) {
  grid-column: 1 / -1;
  min-height: 160px;
}

.bento-feature h2 {
  margin: 22px 0 10px;
  font-size: 28px;
  line-height: 1.18;
}

.bento-feature p {
  max-width: 640px;
  margin: 0;
  color: var(--muted);
  line-height: 1.7;
}

.public-section-head {
  align-items: end;
}

.public-section-head h2 {
  margin: 0;
  font-size: 34px;
}

.preview-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 14px;
}

.preview-card {
  display: grid;
  gap: 0;
  overflow: hidden;
  padding: 0;
  text-align: left;
  color: inherit;
}

.preview-thumb {
  position: relative;
  min-height: 190px;
  border-bottom: 1px solid rgba(20, 28, 45, 0.08);
  overflow: hidden;
  background:
    linear-gradient(135deg, rgba(255, 255, 255, 0.24), transparent 40%),
    linear-gradient(140deg, rgba(25, 184, 154, 0.38), rgba(233, 85, 184, 0.18));
}

.preview-pink .preview-thumb {
  background:
    linear-gradient(135deg, rgba(255, 255, 255, 0.26), transparent 42%),
    linear-gradient(140deg, rgba(233, 85, 184, 0.42), rgba(255, 205, 119, 0.22));
}

.preview-gold .preview-thumb {
  background:
    linear-gradient(135deg, rgba(255, 255, 255, 0.26), transparent 42%),
    linear-gradient(140deg, rgba(231, 184, 75, 0.46), rgba(25, 184, 154, 0.2));
}

.preview-blue .preview-thumb {
  background:
    linear-gradient(135deg, rgba(255, 255, 255, 0.26), transparent 42%),
    linear-gradient(140deg, rgba(78, 146, 255, 0.4), rgba(25, 184, 154, 0.18));
}

.preview-thumb::after {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(180deg, rgba(0, 0, 0, 0.16), transparent 32%, rgba(0, 0, 0, 0.18)),
    linear-gradient(135deg, rgba(255, 255, 255, 0.18), transparent 45%);
}

.preview-thumb img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
}

.preview-number,
.preview-duration {
  position: absolute;
  z-index: 1;
  top: 18px;
  display: inline-flex;
  align-items: center;
  min-height: 30px;
  border: 1px solid rgba(255, 255, 255, 0.36);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.84);
  color: rgba(17, 24, 39, 0.82);
  padding: 6px 10px;
  font-size: 12px;
  font-weight: 800;
  box-shadow: 0 10px 28px rgba(15, 23, 42, 0.1);
}

.preview-number {
  left: 18px;
}

.preview-duration {
  right: 18px;
}

.play-mark {
  position: absolute;
  z-index: 1;
  left: 50%;
  top: 50%;
  display: grid;
  place-items: center;
  width: 64px;
  height: 64px;
  border: 1px solid rgba(255, 255, 255, 0.6);
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.78);
  box-shadow: 0 18px 44px rgba(28, 39, 64, 0.12);
  transform: translate(-50%, -50%);
}

.play-mark::before {
  content: "";
  width: 0;
  height: 0;
  margin-left: 4px;
  border-top: 10px solid transparent;
  border-bottom: 10px solid transparent;
  border-left: 16px solid var(--text);
}

.preview-body {
  display: grid;
  gap: 10px;
  padding: 18px;
}

.preview-course {
  color: var(--brand-strong);
  font-size: 12px;
  font-weight: 900;
}

.preview-card h3 {
  margin: 0;
  font-size: 20px;
  line-height: 1.25;
}

.preview-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.preview-tags span {
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.54);
  color: var(--muted);
  padding: 5px 8px;
  font-size: 12px;
}

.preview-watch {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: fit-content;
  min-height: 32px;
  margin-top: 4px;
  border: 1px solid rgba(25, 184, 154, 0.26);
  border-radius: 999px;
  background: rgba(25, 184, 154, 0.1);
  color: var(--brand-strong);
  padding: 6px 10px;
  font-size: 13px;
  font-weight: 900;
}

.public-cta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  margin-top: 18px;
  padding: 26px;
}

.public-cta h2 {
  margin: 16px 0 8px;
  font-size: 34px;
}

.public-cta p {
  max-width: 760px;
  margin: 0;
  color: var(--muted);
  line-height: 1.7;
}

.login-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 420px;
  gap: 18px;
  align-items: stretch;
  min-height: calc(100vh - 72px);
  padding-top: 18px;
}

.hero-card {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(280px, 0.8fr);
  grid-template-rows: 1fr auto;
  gap: 20px;
  min-height: 620px;
  padding: 34px;
  overflow: hidden;
}

.hero-copy {
  align-self: center;
  max-width: 620px;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  min-height: 30px;
  padding: 6px 10px;
  border: 1px solid rgba(25, 184, 154, 0.22);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.62);
  color: var(--brand-strong);
  font-size: 13px;
  font-weight: 700;
}

.hero-copy h1 {
  margin: 20px 0 14px;
  font-size: clamp(38px, 5.2vw, 72px);
  line-height: 1.02;
  letter-spacing: 0;
}

.hero-copy p {
  max-width: 560px;
  margin: 0;
  color: var(--muted);
  font-size: 17px;
  line-height: 1.8;
}

.hero-person {
  align-self: end;
  justify-self: center;
  width: min(430px, 100%);
  max-height: 440px;
  object-fit: contain;
  filter: drop-shadow(0 24px 34px rgba(19, 31, 54, 0.18));
}

.bento-strip {
  grid-column: 1 / -1;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
}

.mini-card {
  min-height: 116px;
  padding: 16px;
  border: 1px solid rgba(20, 28, 45, 0.08);
  border-radius: var(--radius);
  background: rgba(255, 255, 255, 0.58);
}

.mini-card strong {
  display: block;
  margin-bottom: 8px;
  font-size: 20px;
}

.mini-card span {
  color: var(--muted);
  font-size: 13px;
  line-height: 1.6;
}

.login-panel {
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 28px;
}

.login-panel h2 {
  margin: 0 0 8px;
  font-size: 28px;
}

.login-panel > p {
  margin: 0 0 24px;
  color: var(--muted);
  line-height: 1.7;
}

.form {
  display: grid;
  gap: 14px;
}

.field {
  display: grid;
  gap: 7px;
}

.field label {
  color: #344054;
  font-size: 13px;
  font-weight: 700;
}

.input,
.textarea,
.select {
  width: 100%;
  min-height: 42px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(255, 255, 255, 0.72);
  color: var(--text);
  outline: none;
  padding: 10px 12px;
}

.textarea {
  min-height: 86px;
  resize: vertical;
}

.input:focus,
.textarea:focus,
.select:focus {
  border-color: rgba(25, 184, 154, 0.5);
  box-shadow: 0 0 0 4px rgba(25, 184, 154, 0.1);
}

.form-error {
  display: none;
  border: 1px solid rgba(214, 71, 71, 0.22);
  border-radius: var(--radius);
  background: rgba(214, 71, 71, 0.08);
  color: var(--danger);
  padding: 10px 12px;
  font-size: 13px;
  line-height: 1.5;
}

.form-error.show {
  display: block;
}

.student-layout {
  display: grid;
  grid-template-columns: minmax(260px, 360px) minmax(0, 1fr);
  gap: 18px;
}

.course-list {
  display: grid;
  gap: 12px;
}

.course-card {
  position: relative;
  display: grid;
  gap: 10px;
  min-height: 154px;
  padding: 18px;
  text-align: left;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(255, 255, 255, 0.68);
  color: inherit;
  overflow: hidden;
}

.course-card.active {
  border-color: rgba(25, 184, 154, 0.42);
  background: rgba(255, 255, 255, 0.9);
}

.course-card.locked {
  opacity: 0.76;
}

.course-card h3 {
  margin: 0;
  font-size: 19px;
}

.course-card p {
  margin: 0;
  color: var(--muted);
  font-size: 13px;
  line-height: 1.6;
}

.course-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: auto;
}

.course-progress {
  display: grid;
  gap: 8px;
}

.progress-label {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  color: var(--muted);
  font-size: 13px;
}

.progress-label strong {
  color: var(--text);
  font-size: 14px;
}

.progress-track {
  width: 100%;
  height: 8px;
  overflow: hidden;
  border: 1px solid rgba(20, 28, 45, 0.08);
  border-radius: 999px;
  background: rgba(20, 28, 45, 0.08);
}

.progress-track span {
  display: block;
  height: 100%;
  border-radius: inherit;
  background: linear-gradient(90deg, rgba(25, 184, 154, 0.95), rgba(90, 203, 214, 0.94));
  transition: width 0.25s ease;
}

.progress-track.small {
  height: 6px;
}

.video-panel {
  min-height: 680px;
  padding: 18px;
}

.video-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 14px;
}

.video-header h2 {
  margin: 0 0 6px;
  font-size: 26px;
}

.video-header p {
  margin: 0;
  color: var(--muted);
}

.player-wrap {
  position: relative;
  overflow: hidden;
  border: 1px solid rgba(20, 28, 45, 0.14);
  border-radius: var(--radius);
  background: #0e1118;
  aspect-ratio: 16 / 9;
}

.player-wrap video {
  width: 100%;
  height: 100%;
  display: block;
  background: #0e1118;
}

.watermark {
  position: absolute;
  right: 18px;
  bottom: 16px;
  pointer-events: none;
  color: rgba(255, 255, 255, 0.54);
  font-size: 13px;
  text-shadow: 0 1px 10px rgba(0, 0, 0, 0.45);
}

.empty-player {
  display: grid;
  place-items: center;
  height: 100%;
  color: rgba(255, 255, 255, 0.72);
  padding: 24px;
  text-align: center;
}

.video-list {
  display: grid;
  gap: 10px;
  margin-top: 14px;
  max-height: 430px;
  overflow: auto;
  padding-right: 4px;
}

.video-item {
  display: grid;
  grid-template-columns: 46px minmax(0, 1fr) auto;
  align-items: center;
  gap: 12px;
  width: 100%;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(255, 255, 255, 0.68);
  padding: 10px;
  text-align: left;
}

.video-item.active {
  border-color: rgba(25, 184, 154, 0.45);
  background: rgba(240, 255, 250, 0.82);
}

.video-index {
  display: grid;
  place-items: center;
  width: 38px;
  height: 38px;
  border-radius: var(--radius);
  background: rgba(25, 184, 154, 0.12);
  color: var(--brand-strong);
  font-weight: 800;
}

.video-info {
  display: grid;
  min-width: 0;
  gap: 8px;
}

.video-title {
  min-width: 0;
  font-weight: 700;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.video-progress-line {
  display: block;
  min-width: 0;
}

.admin-layout {
  display: grid;
  grid-template-columns: 210px minmax(0, 1fr);
  gap: 18px;
}

.sidebar {
  align-self: start;
  padding: 12px;
}

.tab-btn {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  min-height: 42px;
  margin-bottom: 6px;
  border: 1px solid transparent;
  border-radius: var(--radius);
  background: transparent;
  color: var(--muted);
  padding: 9px 10px;
  text-align: left;
}

.tab-btn.active {
  border-color: rgba(25, 184, 154, 0.28);
  background: rgba(255, 255, 255, 0.75);
  color: var(--text);
  font-weight: 800;
}

.admin-main {
  min-height: 720px;
  padding: 18px;
}

.section-head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 16px;
}

.section-head h2 {
  margin: 0 0 6px;
  font-size: 28px;
}

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

.stat-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
}

.stat-card {
  min-height: 132px;
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(255, 255, 255, 0.66);
}

.stat-card span {
  color: var(--muted);
  font-size: 13px;
}

.stat-card strong {
  display: block;
  margin-top: 16px;
  font-size: 38px;
  line-height: 1;
}

.split-grid {
  display: grid;
  grid-template-columns: minmax(260px, 0.8fr) minmax(0, 1.2fr);
  gap: 14px;
}

.panel {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(255, 255, 255, 0.58);
  padding: 14px;
}

.panel h3 {
  margin: 0 0 12px;
}

.table-wrap {
  overflow: auto;
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

table {
  width: 100%;
  min-width: 760px;
  border-collapse: collapse;
  background: rgba(255, 255, 255, 0.56);
}

th,
td {
  border-bottom: 1px solid rgba(20, 28, 45, 0.08);
  padding: 11px 12px;
  text-align: left;
  vertical-align: top;
  font-size: 13px;
}

th {
  color: #344054;
  font-weight: 800;
  background: rgba(255, 255, 255, 0.7);
}

tr:last-child td {
  border-bottom: 0;
}

.row-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.check-grid {
  display: grid;
  gap: 8px;
}

.check-row {
  display: flex;
  align-items: center;
  gap: 8px;
  min-height: 34px;
  color: var(--text);
}

.notice {
  border: 1px solid rgba(183, 121, 31, 0.22);
  border-radius: var(--radius);
  background: rgba(255, 249, 230, 0.72);
  color: var(--warning);
  padding: 12px;
  line-height: 1.6;
}

.modal-backdrop {
  position: fixed;
  inset: 0;
  z-index: 20;
  display: grid;
  place-items: center;
  padding: 18px;
  background: rgba(15, 23, 42, 0.28);
  backdrop-filter: blur(8px);
}

.modal {
  width: min(460px, 100%);
  padding: 22px;
  border: 1px solid rgba(255, 255, 255, 0.4);
  border-radius: var(--radius);
  background: rgba(255, 255, 255, 0.88);
  box-shadow: 0 24px 80px rgba(15, 23, 42, 0.22);
}

.modal h3 {
  margin: 0 0 8px;
  font-size: 24px;
}

.modal p {
  color: var(--muted);
  line-height: 1.7;
}

.qr {
  display: block;
  width: 220px;
  height: 220px;
  object-fit: contain;
  margin: 16px auto;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #fff;
}

@media (max-width: 980px) {
  .public-nav {
    position: static;
    grid-template-columns: 1fr;
  }

  .public-links {
    justify-content: flex-start;
    overflow-x: auto;
  }

  .public-hero,
  .public-bento {
    grid-template-columns: 1fr;
  }

  .public-hero {
    min-height: auto;
  }

  .public-hero-main {
    grid-template-columns: minmax(220px, 0.56fr) minmax(0, 1fr);
    padding: 34px;
  }

  .public-person {
    grid-column: 1;
    grid-row: 1;
    width: min(320px, 100%);
    justify-self: start;
  }

  .public-hero-main .hero-copy {
    grid-column: 2;
    grid-row: 1;
  }

  .hero-metrics,
  .preview-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .bento-feature:nth-child(4) {
    grid-column: auto;
  }

  .public-cta {
    align-items: flex-start;
    flex-direction: column;
  }

  .login-grid,
  .hero-card,
  .student-layout,
  .admin-layout,
  .split-grid {
    grid-template-columns: 1fr;
  }

  .hero-card {
    min-height: auto;
  }

  .hero-person {
    position: static;
    justify-self: end;
    width: 260px;
    opacity: 0.92;
  }

  .bento-strip {
    grid-template-columns: 1fr;
  }

  .stat-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .sidebar {
    display: flex;
    gap: 8px;
    overflow-x: auto;
  }

  .tab-btn {
    white-space: nowrap;
    margin-bottom: 0;
  }
}

@media (max-width: 640px) {
  .app-shell {
    width: min(100% - 20px, 1480px);
    padding-top: 10px;
  }

  .topbar {
    align-items: flex-start;
    flex-direction: column;
  }

  .brand-logo {
    width: 126px;
  }

  .top-actions {
    width: 100%;
    justify-content: space-between;
  }

  .public-nav .top-actions {
    justify-content: flex-start;
  }

  .public-hero-main {
    position: relative;
    grid-template-columns: 1fr;
    padding: 22px;
    min-height: auto;
  }

  .public-hero-main .hero-copy {
    grid-column: 1;
  }

  .public-hero-main .hero-copy h1 {
    font-size: 25px;
  }

  .hero-actions {
    flex-direction: column;
  }

  .hero-actions .btn,
  .login-panel .btn,
  .public-cta .btn {
    width: 100%;
  }

  .public-person {
    display: none;
  }

  .hero-metrics {
    position: static;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 8px;
    margin-top: 18px;
  }

  .preview-grid {
    grid-template-columns: 1fr;
  }

  .hero-metrics div,
  .bento-feature,
  .bento-feature:nth-child(2) {
    min-height: 150px;
  }

  .hero-metrics div {
    min-height: 72px;
    padding: 10px;
  }

  .hero-metrics strong {
    margin-bottom: 4px;
    font-size: 22px;
  }

  .hero-metrics span {
    font-size: 11px;
  }

  .preview-thumb {
    min-height: 170px;
  }

  .public-section-head {
    align-items: flex-start;
    flex-direction: column;
  }

  .hero-card {
    padding: 22px;
  }

  .hero-copy h1 {
    font-size: 40px;
  }

  .login-panel,
  .video-panel,
  .admin-main {
    padding: 16px;
  }

  .stat-grid {
    grid-template-columns: 1fr;
  }

  .video-item {
    grid-template-columns: 40px minmax(0, 1fr);
  }

  .video-item .pill {
    grid-column: 2;
    justify-self: start;
  }
}