/* ============================================================
   YouTutor Landing Page Styles
   Inspired by Glitch Academy — clean, bold, emoji-rich SaaS page
   ============================================================ */

/* === Fonts === */
@import url('https://fonts.googleapis.com/css2?family=DM+Sans:ital,opsz,wght@0,9..40,300;0,9..40,400;0,9..40,500;0,9..40,700;0,9..40,800;1,9..40,400&display=swap');

/* === Landing-specific custom properties === */
:root {
  --color-accent-blue: #90B8F8;
  --color-accent-green: #7DE8A0;
  --color-accent-yellow: #F8D66B;
  --landing-max-width: 1100px;
  --nav-height: 64px;
}

/* === Base === */
.landing-page {
  font-family: 'DM Sans', -apple-system, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  background: #ffffff;
  color: var(--color-text);
  line-height: 1.6;
  overflow-x: hidden;
}

.landing-page *,
.landing-page *::before,
.landing-page *::after {
  box-sizing: border-box;
}

/* === Container === */
.section-inner {
  max-width: var(--landing-max-width);
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* === Section patterns === */
.section-label {
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-primary-dark);
  margin-bottom: 0.75rem;
}

.section-heading {
  font-size: 2.4rem;
  font-weight: 800;
  line-height: 1.15;
  color: var(--color-text);
  margin-bottom: 1rem;
  letter-spacing: -0.02em;
}

.section-sub {
  font-size: 1.1rem;
  color: var(--color-text-soft);
  max-width: 600px;
  line-height: 1.6;
}

/* === Fade-up animation === */
.fade-up {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-up.visible {
  opacity: 1;
  transform: translateY(0);
}

/* === Navigation === */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--nav-height);
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
  z-index: 100;
  display: flex;
  align-items: center;
}

.nav-inner {
  max-width: var(--landing-max-width);
  margin: 0 auto;
  padding: 0 1.5rem;
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo {
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--color-text);
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 0.3rem;
}

.nav-logo .dot {
  display: inline-block;
  width: 8px;
  height: 8px;
  background: var(--color-primary);
  border-radius: 50%;
}

.nav-links {
  display: none;
  list-style: none;
  gap: 2rem;
  align-items: center;
}

.nav-links a {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--color-text-soft);
  text-decoration: none;
  transition: color 0.15s;
}

.nav-links a:hover {
  color: var(--color-text);
}

.nav-right {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.nav-login {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--color-text);
  text-decoration: none;
  display: none;
}

.nav-login:hover {
  color: var(--color-primary-dark);
}

/* === Buttons === */
.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.7rem 1.5rem;
  background: var(--color-primary);
  color: var(--color-text);
  border: none;
  border-radius: 10px;
  font-family: inherit;
  font-size: 0.95rem;
  font-weight: 700;
  cursor: pointer;
  text-decoration: none;
  transition: background 0.15s, transform 0.1s;
}

.btn-primary:hover {
  background: var(--color-primary-dark);
}

.btn-primary:active {
  transform: scale(0.97);
}

.btn-primary-lg {
  padding: 0.85rem 2rem;
  font-size: 1.05rem;
  border-radius: 12px;
}

.btn-ghost {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.7rem 1.5rem;
  background: transparent;
  color: var(--color-text);
  border: 2px solid var(--color-border);
  border-radius: 10px;
  font-family: inherit;
  font-size: 0.95rem;
  font-weight: 700;
  cursor: pointer;
  text-decoration: none;
  transition: border-color 0.15s, background 0.15s;
}

.btn-ghost:hover {
  border-color: var(--color-text);
  background: var(--color-bg);
}

.btn-ghost-lg {
  padding: 0.85rem 2rem;
  font-size: 1.05rem;
  border-radius: 12px;
}

/* === Hero === */
.hero {
  padding-top: calc(var(--nav-height) + 5rem);
  padding-bottom: 5rem;
}

.hero-layout {
  display: flex;
  flex-direction: column;
  align-items: center;
}

.hero-text {
  text-align: center;
}

/* Full background highlight for key phrases */
.highlight {
  background: var(--color-primary);
  padding: 0.12em 0.25em 0.16em;
  border-radius: 6px;
  box-decoration-break: clone;
  -webkit-box-decoration-break: clone;
}

.hero .section-label {
  font-size: 0.85rem;
}

.hero .section-heading {
  font-size: 3rem;
  max-width: 720px;
  margin: 0 auto 1.25rem;
  line-height: 1.55;
}

.hero-heading-split {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.hero-line {
  display: block;
}

.hero-value-prop {
  font-size: 1.3rem;
  font-weight: 600;
  color: var(--color-text);
  margin: 0 auto 0.75rem;
  max-width: 620px;
}

.hero .section-sub {
  margin: 0 auto 1rem;
  font-size: 1.15rem;
  max-width: 620px;
}

.hero-tagline {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--color-text);
  letter-spacing: -0.01em;
  margin: 0 auto 2.5rem;
}

.hero-ctas {
  display: flex;
  gap: 1rem;
  justify-content: center;
  flex-wrap: wrap;
}

.hero-visual {
  margin-top: 4rem;
  display: flex;
  justify-content: center;
}

.hero-flashcard {
  max-width: 480px;
  width: 100%;
  text-align: left;
  background: var(--color-surface);
  border: 2px solid var(--color-border);
  border-radius: 20px;
  padding: 1rem;
  box-shadow: 0 12px 48px rgba(0, 0, 0, 0.08), 0 4px 16px rgba(0, 0, 0, 0.04);
  position: relative;
  overflow: hidden;
}

.flashcard-player-wrap {
  position: relative;
  width: 100%;
  padding-bottom: 56.25%;
  background: #000;
  border-radius: 12px;
  overflow: hidden;
  margin-bottom: 1rem;
}

.flashcard-player-wrap iframe {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
}

.flashcard-segment {
  background: var(--color-bg);
  border-radius: 12px;
  padding: 1.5rem 1.25rem 1.75rem;
  margin-bottom: 1rem;
  text-align: center;
  position: relative;
}

.flashcard-progress-wrap {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 0.75rem;
}

.flashcard-progress-bar {
  flex: 1;
  height: 6px;
  background: var(--color-bg);
  border-radius: 99px;
  overflow: hidden;
}

.flashcard-progress-fill {
  height: 100%;
  background: var(--color-primary);
  border-radius: 99px;
  transition: width 0.3s ease;
}

.flashcard-progress-label {
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--color-text-soft);
  white-space: nowrap;
  flex-shrink: 0;
}

.flashcard-field-target {
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--color-text);
  line-height: 1.5;
  margin-bottom: 0.15rem;
}

.flashcard-field-question {
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--color-text);
  margin-top: 0.75rem;
}

.flashcard-field-question strong {
  color: var(--color-text);
}

.flashcard-field-translation {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-text);
  line-height: 1.5;
  margin-top: 1.25rem;
  margin-bottom: 0.75rem;
  animation: fieldRevealLanding 0.25s ease-out;
}

.flashcard-field-romanization {
  font-size: 0.9rem;
  color: var(--color-text-soft);
  line-height: 1.5;
  animation: fieldRevealLanding 0.25s ease-out;
}

@keyframes fieldRevealLanding {
  from { opacity: 0; transform: translateY(4px); }
  to { opacity: 1; transform: translateY(0); }
}

/* Action buttons (Replay / Reveal) */
.flashcard-actions {
  display: flex;
  gap: 0.5rem;
}

.flashcard-btn-replay,
.flashcard-btn-reveal {
  flex: 1;
  min-height: 44px;
  padding: 0.4rem 0.5rem;
  border: none;
  border-radius: 10px;
  cursor: pointer;
  transition: background 0.15s, transform 0.1s;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: 'DM Sans', sans-serif;
  font-size: 0.9rem;
  font-weight: 600;
}

.flashcard-actions + .flashcard-rating {
  margin-top: 0.5rem;
}

.flashcard-btn-replay:active,
.flashcard-btn-reveal:active {
  transform: scale(0.96);
}

.flashcard-btn-replay {
  background: var(--color-surface);
  color: var(--color-text);
  border: 1px solid var(--color-border);
}

.flashcard-btn-replay:hover {
  background: var(--color-bg);
}

.flashcard-btn-reveal {
  background: var(--color-text);
  color: var(--color-surface);
}

.flashcard-btn-reveal:hover {
  background: #2d2d44;
}

.flashcard-btn-label {
  font-size: 1rem;
  font-weight: 600;
}

.flashcard-btn-hint {
  font-size: 0.65rem;
  opacity: 0.55;
}

/* Rating buttons (revealed state) */
.flashcard-rating {
  display: flex;
  gap: 0.5rem;
}

.flashcard-rating-btn {
  flex: 1;
  min-height: 52px;
  padding: 0.5rem 0.25rem;
  border-radius: 12px;
  font-family: 'DM Sans', sans-serif;
  font-weight: 700;
  font-size: 0.85rem;
  cursor: pointer;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.15rem;
  transition: transform 0.1s;
}

.flashcard-rating-btn:active {
  transform: scale(0.95);
}

.rating-interval {
  font-size: 0.65rem;
  font-weight: 500;
  opacity: 0.7;
}

.rating-again {
  background: #fff0f0;
  border: 1px solid #e8a0a0;
  color: #c0392b;
}

.rating-hard {
  background: #fff8ed;
  border: 1px solid #e8c87d;
  color: #b8860b;
}

.rating-good {
  background: #f0faf0;
  border: 1px solid #90d490;
  color: #2d7d46;
}

.rating-easy {
  background: #f0f7ff;
  border: 1px solid #90c0e8;
  color: #2874a6;
}

.rating-short {
  background: #fff8ed;
  border: 1px solid #e8c87d;
  color: #b8860b;
}

.rating-mid {
  background: #f0faf0;
  border: 1px solid #90d490;
  color: #2d7d46;
}

.rating-long {
  background: #f0f7ff;
  border: 1px solid #90c0e8;
  color: #2874a6;
}

/* === Stats strip === */
.stats {
  background: var(--color-text);
  padding: 2.5rem 0;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.5rem;
  text-align: center;
}

.stat-item {
  color: #fff;
}

.stat-number {
  font-size: 2.2rem;
  font-weight: 800;
  color: var(--color-primary);
  line-height: 1.2;
}

.stat-label {
  font-size: 0.85rem;
  font-weight: 500;
  color: rgba(255, 255, 255, 0.7);
  margin-top: 0.25rem;
}

/* === Marquee === */
.marquee {
  background: var(--color-primary);
  padding: 0.85rem 0;
  overflow: hidden;
  white-space: nowrap;
}

.marquee-track {
  display: inline-flex;
  animation: marqueeScroll 25s linear infinite;
}

.marquee-text {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--color-text);
  padding: 0 2rem;
}

@keyframes marqueeScroll {
  from { transform: translateX(0); }
  to { transform: translateX(-50%); }
}

/* === Why different === */
.why-section {
  padding: 6rem 0;
}

.why-section .section-heading {
  margin-bottom: 3rem;
}

.why-features {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  margin-bottom: 3rem;
}

.why-feature {
  display: flex;
  gap: 1rem;
  align-items: flex-start;
}

.why-feature-emoji {
  font-size: 1.6rem;
  flex-shrink: 0;
  margin-top: 0.1rem;
}

.why-feature-content h3 {
  font-size: 1.05rem;
  font-weight: 700;
  margin-bottom: 0.25rem;
}

.why-feature-content p {
  font-size: 0.95rem;
  color: var(--color-text-soft);
  line-height: 1.55;
}

/* Comparison cards */
.comparison-cards {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.25rem;
}

.comparison-card {
  border-radius: 16px;
  padding: 1.75rem;
}

.comparison-card.card-muted {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
}

.comparison-card.card-highlight {
  background: var(--color-primary);
  border: 1px solid var(--color-primary);
}

.comparison-card h3 {
  font-size: 1.1rem;
  font-weight: 800;
  margin-bottom: 0.75rem;
}

.comparison-card ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.comparison-card li {
  font-size: 0.9rem;
  line-height: 1.5;
}

.comparison-card.card-muted li {
  color: var(--color-text-soft);
}

.comparison-card.card-highlight li {
  color: var(--color-text);
}

/* === How it works === */
.how-section {
  padding: 6rem 0;
  background: var(--color-bg);
}

.how-section .section-heading {
  margin-bottom: 3rem;
}

.steps-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
}

.step-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 16px;
  padding: 2rem 1.75rem;
  position: relative;
}

.step-number {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  background: var(--color-primary);
  color: var(--color-text);
  font-weight: 800;
  font-size: 1rem;
  border-radius: 50%;
  margin-bottom: 1rem;
}

.step-card h3 {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
}

.step-card p {
  font-size: 0.95rem;
  color: var(--color-text-soft);
  line-height: 1.55;
}

.step-emoji {
  font-size: 2rem;
  margin-bottom: 0.75rem;
}

/* === Sound familiar (pain points) === */
.familiar-section {
  padding: 6rem 0;
}

.familiar-section .section-heading {
  margin-bottom: 3rem;
}

.familiar-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.25rem;
}

.familiar-card {
  border-radius: 16px;
  padding: 2rem 1.75rem;
}

.familiar-card.card-pink {
  background: #fff0fb;
  border: 1px solid #ffd6f0;
}

.familiar-card.card-green {
  background: #edfff4;
  border: 1px solid #c8f5d8;
}

.familiar-card.card-yellow {
  background: #fffbeb;
  border: 1px solid #f5e6a3;
}

.familiar-card h3 {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 0.75rem;
  line-height: 1.4;
}

.familiar-card p {
  font-size: 0.9rem;
  color: var(--color-text-soft);
  line-height: 1.6;
}

.familiar-emoji {
  font-size: 1.6rem;
  margin-bottom: 0.75rem;
}

/* === Features showcase === */
.features-section {
  padding: 6rem 0;
  background: var(--color-bg);
}

.features-section .section-heading {
  margin-bottom: 3rem;
}

.features-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.25rem;
}

.feature-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 16px;
  padding: 1.75rem;
  position: relative;
}

.feature-card-emoji {
  font-size: 1.8rem;
  margin-bottom: 0.75rem;
}

.feature-card h3 {
  font-size: 1.05rem;
  font-weight: 700;
  margin-bottom: 0.4rem;
}

.feature-card p {
  font-size: 0.9rem;
  color: var(--color-text-soft);
  line-height: 1.55;
}

.badge-premium {
  display: inline-block;
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  background: var(--color-primary);
  color: var(--color-text);
  padding: 0.2rem 0.6rem;
  border-radius: 6px;
  margin-left: 0.5rem;
  vertical-align: middle;
}

/* === Pricing === */
.pricing-section {
  padding: 6rem 0;
}

.pricing-section .section-heading {
  text-align: center;
  margin-bottom: 0.75rem;
}

.pricing-section .section-sub {
  text-align: center;
  margin: 0 auto 3rem;
}

.pricing-toggle {
  display: flex;
  justify-content: center;
  gap: 0.5rem;
  margin-bottom: 2.5rem;
}

.pricing-toggle button {
  padding: 0.5rem 1.25rem;
  font-family: inherit;
  font-size: 0.85rem;
  font-weight: 600;
  border: 2px solid var(--color-border);
  border-radius: 8px;
  background: transparent;
  color: var(--color-text-soft);
  cursor: pointer;
  transition: all 0.15s;
}

.pricing-toggle button.active {
  background: var(--color-text);
  color: #fff;
  border-color: var(--color-text);
}

.pricing-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.25rem;
  max-width: 900px;
  margin: 0 auto;
}

.pricing-card {
  background: var(--color-surface);
  border: 2px solid var(--color-border);
  border-radius: 18px;
  padding: 2rem 1.75rem;
  position: relative;
  display: flex;
  flex-direction: column;
}

.pricing-card.popular {
  border-color: var(--color-primary);
}

.pricing-popular-badge {
  position: absolute;
  top: -12px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--color-primary);
  color: var(--color-text);
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 0.25rem 1rem;
  border-radius: 20px;
}

.pricing-card h3 {
  font-size: 1.2rem;
  font-weight: 800;
  margin-bottom: 0.5rem;
}

.pricing-price {
  margin-bottom: 1.25rem;
}

.pricing-amount {
  font-size: 2.5rem;
  font-weight: 800;
  line-height: 1.2;
}

.pricing-period {
  font-size: 0.9rem;
  color: var(--color-text-soft);
}

.pricing-save {
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 600;
  color: #2d7d46;
  background: #edfff4;
  padding: 0.15rem 0.6rem;
  border-radius: 6px;
  margin-left: 0.5rem;
}

.pricing-features {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
  margin-bottom: 2rem;
  flex: 1;
}

.pricing-features li {
  font-size: 0.9rem;
  display: flex;
  align-items: flex-start;
  gap: 0.5rem;
  line-height: 1.4;
}

.pricing-features li::before {
  content: "✓";
  color: #2d7d46;
  font-weight: 700;
  flex-shrink: 0;
}

.pricing-card .btn-primary,
.pricing-card .btn-ghost {
  width: 100%;
  justify-content: center;
}

/* === Guarantee === */
.guarantee-section {
  padding: 4rem 0;
  background: var(--color-bg);
}

.guarantee-box {
  max-width: 700px;
  margin: 0 auto;
  text-align: center;
  background: var(--color-surface);
  border: 2px solid var(--color-border);
  border-radius: 18px;
  padding: 3rem 2rem;
}

.guarantee-emoji {
  font-size: 3rem;
  margin-bottom: 1rem;
}

.guarantee-box h2 {
  font-size: 1.6rem;
  font-weight: 800;
  margin-bottom: 0.75rem;
}

.guarantee-box p {
  font-size: 1.05rem;
  color: var(--color-text-soft);
  line-height: 1.6;
  max-width: 500px;
  margin: 0 auto;
}

/* === Final CTA === */
.final-cta {
  padding: 6rem 0;
  text-align: center;
}

.final-cta .section-heading {
  max-width: 600px;
  margin: 0 auto 1rem;
}

.final-cta .section-sub {
  margin: 0 auto 2.5rem;
}

.cta-checklist {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.75rem 2rem;
  margin-bottom: 2.5rem;
}

.cta-checklist li {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--color-text-soft);
}

.cta-checklist li::before {
  content: "✓ ";
  color: #2d7d46;
  font-weight: 700;
}

/* === Footer === */
.footer {
  background: var(--color-text);
  color: #fff;
  padding: 4rem 0 2rem;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2.5rem;
  margin-bottom: 3rem;
}

.footer-brand {
  max-width: 280px;
}

.footer-logo {
  font-size: 1.25rem;
  font-weight: 800;
  color: #fff;
  display: flex;
  align-items: center;
  gap: 0.3rem;
  margin-bottom: 0.75rem;
}

.footer-logo .dot {
  display: inline-block;
  width: 8px;
  height: 8px;
  background: var(--color-primary);
  border-radius: 50%;
}

.footer-tagline {
  font-size: 0.9rem;
  color: rgba(255, 255, 255, 0.6);
  line-height: 1.5;
}

.footer-col h4 {
  font-size: 0.85rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: rgba(255, 255, 255, 0.5);
  margin-bottom: 1rem;
}

.footer-col ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.footer-col a {
  font-size: 0.9rem;
  color: rgba(255, 255, 255, 0.75);
  text-decoration: none;
  transition: color 0.15s;
}

.footer-col a:hover {
  color: #fff;
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding-top: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
  align-items: center;
  text-align: center;
}

.footer-copyright {
  font-size: 0.8rem;
  color: rgba(255, 255, 255, 0.4);
}

.footer-social {
  display: flex;
  gap: 1.5rem;
}

.footer-social a {
  color: rgba(255, 255, 255, 0.5);
  text-decoration: none;
  font-size: 0.85rem;
  transition: color 0.15s;
}

.footer-social a:hover {
  color: #fff;
}

/* ============================================================
   Responsive — tablet and up
   ============================================================ */
@media (min-width: 640px) {
  .section-heading {
    font-size: 2.8rem;
  }

  .hero .section-heading {
    font-size: 3.4rem;
  }

  .stats-grid {
    grid-template-columns: repeat(4, 1fr);
  }

  .steps-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .familiar-grid {
    grid-template-columns: repeat(3, 1fr);
  }

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

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

  .pricing-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .footer-grid {
    grid-template-columns: 1.5fr 1fr 1fr 1fr;
  }

  .footer-bottom {
    flex-direction: row;
    justify-content: space-between;
  }
}

/* ============================================================
   Responsive — desktop
   ============================================================ */
@media (min-width: 900px) {
  .nav-links {
    display: flex;
  }

  .nav-login {
    display: inline;
  }

  .hero-layout {
    flex-direction: row;
    align-items: center;
    gap: 3rem;
  }

  .hero-text {
    flex: 1;
    text-align: left;
  }

  .hero .section-heading {
    margin-left: 0;
    margin-right: 0;
  }

  .hero .section-sub {
    margin-left: 0;
    margin-right: 0;
  }

  .hero-value-prop {
    margin-left: 0;
    margin-right: 0;
  }

  .hero-visual {
    margin-top: 0;
    flex-shrink: 0;
  }

  .hero-flashcard {
    max-width: 420px;
  }

  .hero-ctas {
    justify-content: flex-start;
  }

  .features-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .why-layout {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
    align-items: start;
  }

  .why-features {
    margin-bottom: 0;
  }
}