:root {
  --background: #f6f8fb;
  --surface: #ffffff;
  --surface-soft: #f0f6f4;
  --ink: #101820;
  --muted: #60706d;
  --line: #d8e2df;
  --accent: #0b7a75;
  --accent-dark: #075a56;
  --accent-soft: #def5ee;
  --premium: #254f8f;
  --premium-dark: #183b6f;
  --gold: #d9972b;
  --warning: #a84f19;
  --shadow: 0 24px 70px rgba(16, 24, 32, 0.13);
  --shadow-soft: 0 12px 34px rgba(16, 24, 32, 0.08);
}

* {
  box-sizing: border-box;
}

[hidden] {
  display: none !important;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  background:
    linear-gradient(180deg, #fbfcfe 0%, var(--background) 44%, #eef5f2 100%);
  color: var(--ink);
  font-family: Inter, Arial, Helvetica, sans-serif;
}

body.modal-open {
  overflow: hidden;
}

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

a {
  color: inherit;
  text-decoration: none;
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding: 12px clamp(16px, 4vw, 56px);
  border-bottom: 1px solid rgba(216, 226, 223, 0.84);
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(18px);
}

.brand,
.nav-links,
.topbar-actions,
.account-status,
.hero-actions,
.trust-row,
.section-heading,
.chat-header,
.input-row,
.proof-strip,
.closing-section,
.closing-actions {
  display: flex;
  align-items: center;
}

.brand {
  gap: 10px;
  font-weight: 950;
}

.brand-mark {
  display: grid;
  place-items: center;
  width: 40px;
  height: 40px;
  border-radius: 8px;
  background: linear-gradient(135deg, var(--ink), var(--accent-dark));
  color: white;
  font-size: 22px;
  font-weight: 950;
  box-shadow: 0 12px 24px rgba(11, 122, 117, 0.22);
}

.brand-name {
  font-size: 20px;
}

.nav-links {
  gap: 24px;
  color: var(--muted);
  font-weight: 850;
}

.nav-links a:hover,
.nav-links a:focus-visible {
  color: var(--ink);
}

.topbar-actions {
  gap: 10px;
}

.account-status {
  gap: 10px;
  padding: 7px 9px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
  color: var(--muted);
  font-size: 14px;
  font-weight: 850;
  box-shadow: var(--shadow-soft);
}

.badge {
  padding: 7px 9px;
  border-radius: 8px;
  background: var(--accent-soft);
  color: var(--accent-dark);
  font-weight: 950;
}

.topbar-cta {
  display: inline-flex;
  align-items: center;
  min-height: 42px;
  padding: 0 15px;
  border-radius: 8px;
  background: var(--ink);
  color: white;
  font-weight: 950;
  box-shadow: var(--shadow-soft);
}

.topbar-login {
  min-height: 42px;
  padding: 0 13px;
  border: 1px solid var(--line);
  background: var(--surface);
  color: var(--ink);
  box-shadow: var(--shadow-soft);
}

.topbar-login:hover,
.topbar-login:focus-visible {
  border-color: var(--accent);
  background: var(--surface-soft);
}

.topbar-cta:hover,
.topbar-cta:focus-visible {
  background: var(--accent-dark);
}

.eyebrow {
  margin: 0 0 8px;
  color: var(--accent-dark);
  font-size: 12px;
  font-weight: 950;
  letter-spacing: 0;
  text-transform: uppercase;
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1 {
  max-width: 900px;
  margin-bottom: 20px;
  font-size: clamp(42px, 6.4vw, 76px);
  line-height: 0.96;
  letter-spacing: 0;
}

h2 {
  margin-bottom: 0;
  font-size: clamp(30px, 4vw, 50px);
  line-height: 1.02;
}

h3 {
  margin-bottom: 8px;
  font-size: 22px;
}

.hero {
  position: relative;
  display: grid;
  align-items: end;
  min-height: clamp(540px, 72vh, 680px);
  padding: clamp(70px, 9vw, 108px) clamp(16px, 4vw, 56px) 70px;
  overflow: hidden;
  color: white;
  background:
    linear-gradient(90deg, rgba(8, 16, 23, 0.9) 0%, rgba(8, 16, 23, 0.72) 50%, rgba(8, 16, 23, 0.34) 100%),
    url("https://images.unsplash.com/photo-1516321318423-f06f85e504b3?auto=format&fit=crop&w=1800&q=85") center / cover;
}

.hero::after {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 160px;
  background: linear-gradient(180deg, transparent, rgba(246, 248, 251, 0.96));
  content: "";
}

.hero-content {
  position: relative;
  z-index: 1;
  width: min(940px, 100%);
}

.hero-eyebrow {
  color: #9ee8dc;
}

.hero-text {
  max-width: 720px;
  margin-bottom: 28px;
  color: rgba(255, 255, 255, 0.86);
  font-size: clamp(18px, 2vw, 22px);
  line-height: 1.55;
}

.hero-actions {
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 22px;
}

.primary-link,
.secondary-link,
button {
  min-height: 50px;
  border-radius: 8px;
  padding: 0 22px;
  cursor: pointer;
  font-weight: 950;
}

.primary-link,
button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 0;
  background: var(--accent);
  color: white;
  box-shadow: 0 14px 30px rgba(11, 122, 117, 0.24);
}

.primary-link:hover,
.primary-link:focus-visible,
button:hover,
button:focus-visible {
  background: var(--accent-dark);
}

.secondary-link {
  display: inline-flex;
  align-items: center;
  border: 1px solid rgba(255, 255, 255, 0.34);
  background: rgba(255, 255, 255, 0.12);
  color: white;
  backdrop-filter: blur(12px);
}

.secondary-link:hover,
.secondary-link:focus-visible {
  border-color: rgba(255, 255, 255, 0.78);
  background: rgba(255, 255, 255, 0.18);
}

.dark-link {
  border-color: var(--line);
  background: var(--surface);
  color: var(--ink);
}

.dark-link:hover,
.dark-link:focus-visible {
  border-color: var(--accent);
  background: var(--surface-soft);
}

.trust-row {
  flex-wrap: wrap;
  gap: 10px;
}

.trust-row span {
  padding: 9px 11px;
  border: 1px solid rgba(255, 255, 255, 0.24);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.12);
  color: rgba(255, 255, 255, 0.86);
  font-size: 14px;
  font-weight: 850;
  backdrop-filter: blur(10px);
}

.proof-strip,
.product-section,
.subjects-section,
.difference-section,
.method-section,
.comparison-section,
.trust-section,
.feedback-section,
.closing-section {
  width: min(1180px, calc(100% - 32px));
  margin: 0 auto;
  scroll-margin-top: 104px;
}

.proof-strip {
  position: relative;
  z-index: 2;
  justify-content: space-between;
  gap: 18px;
  margin-top: -38px;
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.96);
  box-shadow: var(--shadow);
}

.proof-strip div {
  flex: 1;
  padding: 8px 12px;
}

.proof-strip div + div {
  border-left: 1px solid var(--line);
}

.proof-strip strong,
.proof-strip span {
  display: block;
}

.proof-strip strong {
  margin-bottom: 5px;
  font-size: 18px;
}

.proof-strip span {
  color: var(--muted);
  line-height: 1.4;
}

.subjects-section {
  padding: 74px 0 24px;
}

.difference-section {
  padding: 48px 0 24px;
}

.product-section {
  padding: 58px 0 34px;
}

.section-heading {
  justify-content: space-between;
  gap: 24px;
  margin-bottom: 24px;
}

.compact-heading {
  margin-bottom: 20px;
}

.section-copy {
  width: min(360px, 100%);
  margin-bottom: 0;
  color: var(--muted);
  font-size: 16px;
  line-height: 1.55;
}

.icon-button {
  width: auto;
  min-height: 46px;
  border: 1px solid var(--line);
  background: var(--surface);
  color: var(--ink);
  box-shadow: var(--shadow-soft);
}

.icon-button:hover,
.icon-button:focus-visible {
  background: var(--surface-soft);
}

.app-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 390px;
  gap: 22px;
  align-items: start;
}

.workspace,
.pricing-intro,
.plan,
.subject-grid article,
.difference-column,
.difference-takeaway,
.method-grid article,
.comparison-grid article,
.trust-grid article,
.feedback-form,
.closing-section {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.97);
  box-shadow: var(--shadow);
}

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

.subject-grid article {
  min-height: 220px;
  padding: 22px;
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.98), rgba(247, 251, 249, 0.95));
  transition: transform 180ms ease, box-shadow 180ms ease, border-color 180ms ease;
}

.subject-grid article:hover,
.method-grid article:hover,
.comparison-grid article:hover {
  transform: translateY(-3px);
  border-color: rgba(11, 122, 117, 0.32);
  box-shadow: 0 28px 80px rgba(16, 24, 32, 0.15);
}

.subject-grid span {
  display: inline-block;
  margin-bottom: 30px;
  padding: 7px 9px;
  border-radius: 8px;
  background: var(--accent-soft);
  color: var(--accent-dark);
  font-size: 13px;
  font-weight: 950;
}

.subject-grid h3 {
  margin-bottom: 10px;
  line-height: 1.15;
}

.subject-grid p {
  margin-bottom: 0;
  color: var(--muted);
  line-height: 1.5;
}

.difference-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 18px;
}

.difference-column {
  padding: 26px;
}

.general-ai-column {
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.98), rgba(245, 247, 248, 0.96));
}

.studyai-column {
  border-color: rgba(11, 122, 117, 0.38);
  background:
    linear-gradient(135deg, rgba(11, 122, 117, 0.12), rgba(255, 255, 255, 0.98));
}

.difference-list {
  display: grid;
  gap: 12px;
  padding-left: 0;
  list-style: none;
}

.difference-list li {
  position: relative;
  padding-left: 24px;
  color: var(--muted);
  line-height: 1.5;
}

.difference-list li::before {
  position: absolute;
  left: 0;
  color: var(--accent);
  font-weight: 950;
  content: "✓";
}

.general-ai-column .difference-list li::before {
  color: #8a9895;
  content: "-";
}

.difference-takeaway {
  display: flex;
  gap: 10px;
  align-items: flex-start;
  margin-top: 16px;
  padding: 18px 20px;
  background:
    linear-gradient(90deg, rgba(11, 122, 117, 0.1), rgba(37, 79, 143, 0.08)),
    var(--surface);
}

.difference-takeaway strong {
  flex: 0 0 auto;
}

.difference-takeaway span {
  color: var(--muted);
  line-height: 1.5;
}

.workspace {
  min-height: 760px;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.chat-header {
  justify-content: space-between;
  gap: 16px;
  padding: 22px 24px;
  border-bottom: 1px solid var(--line);
  background:
    linear-gradient(90deg, rgba(11, 122, 117, 0.08), transparent),
    var(--surface);
}

.live-pill {
  padding: 8px 10px;
  border-radius: 8px;
  background: #ecfdf3;
  color: #116438;
  font-size: 13px;
  font-weight: 950;
}

.live-pill.fallback-mode {
  background: #fff7ed;
  color: #9a4a08;
}

.live-pill.api-ready {
  background: #dbeafe;
  color: var(--premium);
}

.chat-messages {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 14px;
  padding: 24px;
  overflow-y: auto;
}

.message {
  max-width: 82%;
  padding: 16px 18px;
  border: 1px solid var(--line);
  border-radius: 8px;
  line-height: 1.52;
}

.message strong {
  display: block;
  margin-bottom: 7px;
}

.message p {
  white-space: pre-wrap;
  margin-bottom: 0;
}

.message.user {
  align-self: flex-end;
  background: var(--accent);
  color: white;
  border-color: var(--accent);
}

.message.assistant {
  align-self: flex-start;
  background:
    linear-gradient(180deg, #fbfffc, var(--surface-soft));
  box-shadow: var(--shadow-soft);
}

.message.pending p {
  color: var(--muted);
}

.question-form {
  padding: 20px 24px 24px;
  border-top: 1px solid var(--line);
  background: var(--surface);
}

.prompt-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 14px;
}

.prompt-chip {
  min-height: 36px;
  border: 1px solid var(--line);
  background: var(--surface-soft);
  color: var(--accent-dark);
  box-shadow: none;
  font-size: 13px;
  font-weight: 950;
}

.prompt-chip:hover,
.prompt-chip:focus-visible {
  background: var(--accent-soft);
  color: var(--accent-dark);
}

.question-form label {
  display: block;
  margin-bottom: 8px;
  color: var(--muted);
  font-weight: 950;
}

.input-row {
  gap: 12px;
}

textarea {
  width: 100%;
  min-height: 82px;
  resize: vertical;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 13px;
  color: var(--ink);
  line-height: 1.45;
}

input,
select {
  width: 100%;
  min-height: 48px;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 0 13px;
  background: var(--surface);
  color: var(--ink);
}

select {
  cursor: pointer;
}

textarea:focus {
  outline: 3px solid rgba(11, 122, 117, 0.18);
  border-color: var(--accent);
}

input:focus,
select:focus {
  outline: 3px solid rgba(11, 122, 117, 0.18);
  border-color: var(--accent);
}

.auth-modal {
  position: fixed;
  inset: 0;
  z-index: 30;
  display: grid;
  place-items: center;
  padding: 18px;
}

.auth-modal[hidden] {
  display: none;
}

.auth-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(8, 16, 23, 0.58);
  backdrop-filter: blur(10px);
}

.auth-card {
  position: relative;
  z-index: 1;
  width: min(560px, 100%);
  max-height: calc(100vh - 36px);
  overflow-y: auto;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
  box-shadow: 0 34px 90px rgba(8, 16, 23, 0.28);
}

.auth-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 18px;
  padding: 24px 24px 18px;
  border-bottom: 1px solid var(--line);
  background:
    linear-gradient(90deg, rgba(11, 122, 117, 0.08), rgba(37, 79, 143, 0.06)),
    var(--surface);
}

.auth-header h2 {
  font-size: clamp(26px, 5vw, 36px);
}

.auth-close {
  min-height: 40px;
  border: 1px solid var(--line);
  background: var(--surface);
  color: var(--ink);
  box-shadow: none;
}

.auth-close:hover,
.auth-close:focus-visible {
  background: var(--surface-soft);
}

.auth-plan {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin: 20px 24px 14px;
  padding: 14px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface-soft);
}

.auth-plan span {
  color: var(--muted);
  font-weight: 850;
}

.auth-tabs {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
  padding: 0 24px;
}

.auth-tab {
  min-height: 44px;
  border: 1px solid var(--line);
  background: var(--surface);
  color: var(--muted);
  box-shadow: none;
}

.auth-tab.active,
.auth-tab:hover,
.auth-tab:focus-visible {
  border-color: rgba(11, 122, 117, 0.34);
  background: var(--accent-soft);
  color: var(--accent-dark);
}

.auth-form {
  display: grid;
  gap: 10px;
  padding: 20px 24px 12px;
}

.auth-form label {
  color: var(--muted);
  font-weight: 950;
}

.auth-form input {
  width: 100%;
  min-height: 50px;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 0 13px;
  color: var(--ink);
}

.auth-form input:focus {
  outline: 3px solid rgba(11, 122, 117, 0.18);
  border-color: var(--accent);
}

.auth-form button[type="submit"] {
  margin-top: 8px;
}

.auth-message {
  margin: 4px 0 0;
  color: var(--accent-dark);
  font-weight: 850;
  line-height: 1.45;
}

.auth-note {
  margin: 0;
  padding: 0 24px 24px;
  color: var(--muted);
  font-size: 13px;
  line-height: 1.5;
}

button:disabled {
  background: #a8b2af;
  cursor: not-allowed;
  box-shadow: none;
}

.limit-warning {
  margin: 12px 0 0;
  color: var(--warning);
  font-weight: 950;
}

.pricing-panel {
  display: grid;
  gap: 16px;
}

.pricing-intro {
  padding: 22px;
  background:
    linear-gradient(135deg, rgba(11, 122, 117, 0.1), rgba(37, 79, 143, 0.08)),
    var(--surface);
}

.pricing-intro h3 {
  margin-bottom: 8px;
}

.pricing-intro p:last-child {
  margin-bottom: 0;
  color: var(--muted);
  line-height: 1.5;
}

.checkout-steps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 8px;
  margin-top: 16px;
}

.checkout-steps span {
  display: grid;
  place-items: center;
  min-height: 38px;
  border: 1px solid rgba(11, 122, 117, 0.18);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.72);
  color: var(--accent-dark);
  font-size: 12px;
  font-weight: 950;
  text-align: center;
}

.plan {
  position: relative;
  overflow: hidden;
  padding: 26px;
}

.popular-badge {
  position: absolute;
  top: 16px;
  right: 16px;
  padding: 8px 10px;
  border-radius: 8px;
  background: #fff3d8;
  color: #8c5a0a;
  font-size: 12px;
  font-weight: 950;
}

.premium-plan {
  border-color: rgba(37, 79, 143, 0.42);
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.98), rgba(242, 247, 255, 0.98));
}

.value-plan {
  border-color: rgba(11, 122, 117, 0.45);
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.98), rgba(239, 250, 246, 0.98));
}

.annual-plan {
  border-color: rgba(217, 151, 43, 0.5);
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.98), rgba(255, 249, 235, 0.96));
}

.premium-plan::before {
  position: absolute;
  inset: 0 0 auto;
  height: 5px;
  background: linear-gradient(90deg, var(--premium), var(--accent), var(--gold));
  content: "";
}

.price {
  margin: 16px 0 18px;
  font-size: 38px;
  font-weight: 950;
  line-height: 1.02;
}

.small-price {
  font-size: 30px;
}

.price span {
  display: block;
  margin-top: 4px;
  color: var(--muted);
  font-size: 15px;
}

ul {
  margin: 0;
  padding-left: 20px;
  color: var(--muted);
  line-height: 1.8;
}

.premium-button {
  width: 100%;
  margin-top: 22px;
  background: var(--premium);
  box-shadow: 0 16px 34px rgba(37, 79, 143, 0.22);
}

.premium-button:hover,
.premium-button:focus-visible {
  background: var(--premium-dark);
}

.payment-note {
  margin: 12px 0 0;
  color: var(--muted);
  font-size: 13px;
  line-height: 1.45;
}

.pricing-note {
  margin: -2px 4px 0;
}

.method-section {
  padding: 46px 0 32px;
}

.method-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
}

.method-grid article {
  padding: 24px;
}

.benefit-number {
  display: inline-block;
  margin-bottom: 18px;
  color: var(--accent);
  font-size: 13px;
  font-weight: 950;
}

.method-grid p {
  margin-bottom: 0;
  color: var(--muted);
  line-height: 1.55;
}

.comparison-section {
  padding: 38px 0 34px;
}

.trust-section {
  padding: 40px 0 34px;
}

.trust-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
}

.trust-grid article {
  padding: 24px;
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.98), rgba(247, 251, 249, 0.95));
}

.trust-grid span {
  display: inline-block;
  margin-bottom: 18px;
  color: var(--premium);
  font-size: 13px;
  font-weight: 950;
}

.trust-grid p {
  margin-bottom: 0;
  color: var(--muted);
  line-height: 1.55;
}

.comparison-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 18px;
}

.comparison-grid article {
  padding: 26px;
}

.comparison-label {
  display: inline-block;
  margin-bottom: 18px;
  padding: 8px 10px;
  border-radius: 8px;
  background: var(--accent-soft);
  color: var(--accent-dark);
  font-size: 13px;
  font-weight: 950;
}

.muted-label {
  background: #eef1f0;
  color: var(--muted);
}

.comparison-grid p {
  margin-bottom: 0;
  color: var(--muted);
  font-size: 20px;
  line-height: 1.45;
}

.highlight-comparison {
  border-color: rgba(11, 122, 117, 0.36);
  background:
    linear-gradient(135deg, rgba(11, 122, 117, 0.11), rgba(255, 255, 255, 0.98));
}

.feedback-section {
  padding: 40px 0 36px;
}

.feedback-grid {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(360px, 1fr);
  gap: 22px;
  align-items: stretch;
}

.feedback-copy {
  display: flex;
  flex-direction: column;
  justify-content: center;
  min-height: 420px;
  padding: 34px;
  border-radius: 8px;
  background:
    linear-gradient(135deg, rgba(11, 122, 117, 0.14), rgba(37, 79, 143, 0.1)),
    var(--surface);
}

.feedback-copy h2 {
  max-width: 560px;
}

.feedback-copy p {
  max-width: 560px;
  color: var(--muted);
  font-size: 18px;
  line-height: 1.55;
}

.feedback-points {
  display: grid;
  gap: 10px;
  margin-top: 18px;
}

.feedback-points span {
  width: fit-content;
  padding: 9px 11px;
  border: 1px solid rgba(11, 122, 117, 0.18);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.72);
  color: var(--accent-dark);
  font-weight: 900;
}

.feedback-form {
  display: grid;
  gap: 16px;
  padding: 26px;
}

.feedback-fields {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

.feedback-fields label {
  align-self: end;
  color: var(--muted);
  font-weight: 950;
}

.feedback-fields label[for="feedbackMessage"],
.feedback-fields textarea,
.feedback-fields input[name="website"] {
  grid-column: 1 / -1;
}

.feedback-fields input[name="website"] {
  position: absolute;
  left: -10000px;
  width: 1px;
  height: 1px;
  opacity: 0;
}

.feedback-status {
  margin: 0;
  padding: 12px 14px;
  border-radius: 8px;
  background: var(--accent-soft);
  color: var(--accent-dark);
  font-weight: 900;
  line-height: 1.45;
}

.feedback-status.error {
  background: #fff3e8;
  color: var(--warning);
}

.closing-section {
  justify-content: space-between;
  gap: 24px;
  margin-bottom: 38px;
  padding: 30px;
  background:
    linear-gradient(135deg, rgba(11, 122, 117, 0.1), rgba(37, 79, 143, 0.08)),
    var(--surface);
}

.closing-section h2 {
  max-width: 760px;
}

.closing-actions {
  flex-wrap: wrap;
  gap: 10px;
}

body.premium-active .badge {
  background: #dbeafe;
  color: var(--premium);
}

.site-footer {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 24px;
  width: min(1180px, calc(100% - 32px));
  margin: 0 auto;
  padding: 26px 0 44px;
  border-top: 1px solid var(--line);
  color: var(--muted);
}

.site-footer p {
  max-width: 480px;
  margin-bottom: 0;
  line-height: 1.5;
}

.footer-brand {
  display: inline-block;
  margin-bottom: 8px;
  color: var(--ink);
  font-size: 20px;
  font-weight: 950;
}

.site-footer nav {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  font-weight: 900;
}

.site-footer a:hover,
.site-footer a:focus-visible {
  color: var(--accent-dark);
}

.legal-page {
  background: var(--background);
}

.legal-shell {
  width: min(920px, calc(100% - 32px));
  margin: 0 auto;
  padding: 58px 0;
}

.legal-card {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
  box-shadow: var(--shadow);
  padding: clamp(24px, 5vw, 46px);
}

.legal-card h1 {
  margin-bottom: 12px;
  color: var(--ink);
  font-size: clamp(38px, 6vw, 58px);
  line-height: 1;
}

.legal-card h2 {
  margin: 30px 0 10px;
  font-size: 24px;
  line-height: 1.2;
}

.legal-card p,
.legal-card li {
  color: var(--muted);
  line-height: 1.7;
}

.legal-card ul {
  margin-bottom: 0;
}

.legal-note {
  margin: 20px 0 0;
  padding: 14px 16px;
  border: 1px solid rgba(217, 151, 43, 0.34);
  border-radius: 8px;
  background: #fff9eb;
  color: #7c520c;
  font-weight: 850;
}

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

@media (max-width: 1080px) {
  .topbar {
    align-items: stretch;
    flex-direction: column;
  }

  .nav-links,
  .topbar-actions {
    width: 100%;
    justify-content: space-between;
  }

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

  .pricing-panel {
    grid-template-columns: repeat(2, 1fr);
  }

  .pricing-intro {
    grid-column: 1 / -1;
  }
}

@media (max-width: 960px) {
  .subject-grid,
  .difference-grid,
  .feedback-grid,
  .comparison-grid,
  .trust-grid,
  .method-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .proof-strip {
    align-items: stretch;
    flex-direction: column;
  }

  .proof-strip div + div {
    border-left: 0;
    border-top: 1px solid var(--line);
  }

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

@media (max-width: 720px) {
  .topbar,
  .topbar-actions,
  .input-row,
  .auth-header,
  .closing-section,
  .closing-actions,
  .site-footer {
    align-items: stretch;
    flex-direction: column;
  }

  .nav-links {
    gap: 10px;
    overflow-x: auto;
    padding-bottom: 2px;
  }

  .account-status {
    justify-content: space-between;
  }

  .topbar-cta,
  .primary-link,
  .secondary-link {
    justify-content: center;
  }

  .hero {
    min-height: 610px;
    padding-top: 82px;
  }

  .proof-strip,
  .product-section,
  .subjects-section,
  .difference-section,
  .method-section,
  .comparison-section,
  .trust-section,
  .feedback-section,
  .closing-section {
    scroll-margin-top: 224px;
  }

  h1 {
    font-size: 42px;
  }

  .pricing-panel,
  .subject-grid,
  .difference-grid,
  .feedback-grid,
  .comparison-grid,
  .trust-grid,
  .method-grid {
    grid-template-columns: 1fr;
  }

  .feedback-copy {
    min-height: auto;
    padding: 24px;
  }

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

  .difference-takeaway {
    flex-direction: column;
  }

  .workspace {
    min-height: 680px;
  }

  .auth-tabs {
    grid-template-columns: 1fr;
  }

  .checkout-steps {
    grid-template-columns: 1fr;
  }

  .message {
    max-width: 100%;
  }

  #askButton {
    width: 100%;
  }
}