/* ============================================
   English Landing — Soft blue theme
   System fonts (Inter fallback), no CDN
   ============================================ */

:root {
  --color-blue-50: #eff6ff;
  --color-blue-100: #dbeafe;
  --color-blue-200: #bfdbfe;
  --color-blue-500: #3b82f6;
  --color-blue-600: #2563eb;
  --color-blue-700: #1d4ed8;
  --color-gray-100: #f3f4f6;
  --color-gray-200: #e5e7eb;
  --color-gray-300: #d1d5db;
  --color-gray-500: #6b7280;
  --color-gray-600: #4b5563;
  --color-gray-700: #374151;
  --color-gray-900: #111827;
  --color-hero-dark: #2C2C34;
  --color-hero-blue: #406BE0;
  --color-learn-heading: #242A45;
  --color-learn-text: #6C727F;
  --color-icon-bg: #F4F8FA;
  --color-icon-circle: #485adb;
  --color-form-heading: #333333;
  --color-form-subtext: #555D6B;
  --color-form-callout-blue: #3F51B5;
  --color-form-placeholder: #AAAAAA;
  --color-form-helper: #888888;
  --color-form-border: #DDDDDD;
  --color-why-heading: #212529;
  --color-why-text: #495057;
  --color-why-icon: #6399e3;
  --color-why-divider: #dee2e6;
  --color-when-icon-bg: #e0f2f7;
  --color-when-icon: #2196f3;
  --color-when-box-bg: #e0f7fa;
  --color-cta-bg: #2962ff;
  --color-white: #ffffff;
  --shadow-soft: 0 4px 14px rgba(0, 0, 0, 0.06);
  --shadow-card: 0 10px 30px rgba(0, 0, 0, 0.08);
  --radius: 14px;
  --container: 1100px;
  --section-padding-d: 80px;
  --section-padding-m: 50px;
  --font-sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.6;
  color: var(--color-gray-900);
  background: var(--color-white);
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

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

/* Container */
.container {
  width: 100%;
  max-width: var(--container);
  margin-left: auto;
  margin-right: auto;
  padding-left: 20px;
  padding-right: 20px;
}

@media (min-width: 768px) {
  .container {
    padding-left: 24px;
    padding-right: 24px;
  }
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 14px 28px;
  font-family: inherit;
  font-size: 1rem;
  font-weight: 600;
  line-height: 1.25;
  border: none;
  border-radius: var(--radius);
  cursor: pointer;
  transition: background 0.2s ease, box-shadow 0.2s ease, transform 0.15s ease;
}

.btn--primary {
  background: linear-gradient(135deg, var(--color-blue-600) 0%, #1d4ed8 100%);
  color: var(--color-white);
  box-shadow: var(--shadow-soft);
}

.btn--primary:hover {
  background: linear-gradient(135deg, var(--color-blue-700) 0%, #1e40af 100%);
  box-shadow: 0 6px 20px rgba(37, 99, 235, 0.35);
}

.btn--primary:focus {
  outline: 2px solid var(--color-blue-500);
  outline-offset: 2px;
}

.btn--white {
  background: var(--color-white);
  color: var(--color-blue-600);
}

.btn--white:hover {
  background: var(--color-blue-50);
  color: var(--color-blue-700);
}

.btn--full {
  width: 100%;
}

/* Section common */
.section {
  padding-top: var(--section-padding-m);
  padding-bottom: var(--section-padding-m);
}

@media (min-width: 768px) {
  .section {
    padding-top: var(--section-padding-d);
    padding-bottom: var(--section-padding-d);
  }
}

.section__title {
  margin: 0 0 12px;
  font-size: 1.75rem;
  font-weight: 700;
  line-height: 1.25;
  text-align: center;
  color: var(--color-gray-900);
}

@media (min-width: 640px) {
  .section__title {
    font-size: 2.25rem;
  }
}

.section__subtitle {
  margin: 0 auto 2rem;
  max-width: 42rem;
  font-size: 1.0625rem;
  line-height: 1.6;
  text-align: center;
  color: var(--color-gray-600);
}

/* 1. HERO */
.hero {
  background: linear-gradient(160deg, var(--color-blue-50) 0%, #e0f2fe 50%, var(--color-blue-50) 100%);
  padding-top: var(--section-padding-m);
  padding-bottom: var(--section-padding-m);
  min-height: 0;
}

@media (min-width: 768px) {
  .hero {
    padding-top: var(--section-padding-d);
    padding-bottom: var(--section-padding-d);
  }
}

.hero__inner {
  display: grid;
  gap: 2rem;
  align-items: center;
}

@media (min-width: 1024px) {
  .hero__inner {
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
  }
}

.hero__content {
  order: 1;
}

.hero__label {
  display: inline-block;
  margin-bottom: 12px;
  padding: 6px 14px;
  font-size: 0.8125rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--color-hero-blue);
  background: var(--color-blue-100);
  border: 1px solid rgba(64, 107, 224, 0.4);
  border-radius: 999px;
}

.hero__title {
  margin: 0 0 16px;
  font-size: 1.875rem;
  font-weight: 700;
  line-height: 1.2;
}

.hero__title-dark {
  color: var(--color-hero-dark);
}

.hero__title-blue {
  color: var(--color-hero-blue);
}

@media (min-width: 640px) {
  .hero__title {
    font-size: 2.5rem;
  }
}

@media (min-width: 1024px) {
  .hero__title {
    font-size: 3rem;
  }
}

.hero__subtext {
  margin: 0 0 24px;
  font-size: 1.125rem;
  line-height: 1.6;
  color: var(--color-gray-600);
}

.hero__media {
  order: 0;
  display: flex;
  justify-content: center;
}

@media (min-width: 1024px) {
  .hero__media {
    order: 1;
    justify-content: flex-end;
  }
}

.hero__img {
  width: 100%;
  max-width: 280px;
  border-radius: var(--radius);
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.12);
}

@media (min-width: 640px) {
  .hero__img {
    max-width: 320px;
  }
}

@media (min-width: 1024px) {
  .hero__img {
    max-width: 352px;
  }
}

/* 2. WHAT WILL YOU LEARN — Cards */
.section--learn .section__title {
  color: var(--color-learn-heading);
}

.section--learn .section__subtitle {
  margin-bottom: 2.5rem;
  color: var(--color-learn-text);
}

.cards {
  display: grid;
  gap: 1.5rem;
}

.cards--three {
  grid-template-columns: 1fr;
}

@media (min-width: 640px) {
  .cards--three {
    grid-template-columns: repeat(3, 1fr);
  }
}

.card {
  background: var(--color-white);
  padding: 1.75rem;
  border-radius: var(--radius);
  box-shadow: var(--shadow-card);
  transition: box-shadow 0.2s ease;
}

.card:hover {
  box-shadow: 0 14px 40px rgba(0, 0, 0, 0.1);
}

.card__icon {
  width: 64px;
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1rem;
  background: var(--color-icon-bg);
  border-radius: 12px;
}

.card__icon-circle {
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-icon-circle);
  border-radius: 50%;
  color: var(--color-white);
}

.section--learn .card__title {
  color: var(--color-learn-heading);
}

.section--learn .card__text {
  color: var(--color-learn-text);
}

.card__title {
  margin: 0 0 8px;
  font-size: 1.0625rem;
  font-weight: 600;
  line-height: 1.35;
  color: var(--color-gray-900);
}

.card__text {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.5;
  color: var(--color-gray-600);
}

/* 3. GIVEAWAY FORM */
.section--form {
  background: #f5f8fc;
}

.section--form .section__title {
  color: var(--color-form-heading);
}

.section--form .section__subtitle {
  color: var(--color-form-subtext);
}

.form-tagline {
  margin: 0 auto 1.5rem;
  font-size: 0.9375rem;
  font-weight: 400;
  text-align: center;
  color: var(--color-form-subtext);
}

.form-tagline__highlight {
  color: var(--color-form-callout-blue);
  text-decoration: underline;
}

.form-message {
  max-width: 32rem;
  margin: 0 auto 1rem;
  padding: 12px 16px;
  font-size: 0.9375rem;
  line-height: 1.5;
  text-align: center;
  border-radius: var(--radius);
}

.form-message--success {
  background: #d1fae5;
  color: #065f46;
  border: 1px solid #6ee7b7;
}

.form-message--error {
  background: #fee2e2;
  color: #991b1b;
  border: 1px solid #fca5a5;
}

.form-card {
  max-width: 42rem;
  margin: 0 auto;
  padding: 2rem;
  background: var(--color-white);
  border-radius: var(--radius);
  box-shadow: var(--shadow-card);
}

@media (min-width: 640px) {
  .form-card {
    padding: 2.5rem;
  }
}

.giveaway-form .form-row {
  margin-bottom: 1.25rem;
}

.giveaway-form label,
.form-label {
  display: block;
  margin-bottom: 6px;
  font-size: 0.875rem;
  font-weight: 400;
  color: var(--color-form-heading);
}

.giveaway-form input[type="text"],
.giveaway-form input[type="email"],
.giveaway-form select {
  width: 100%;
  padding: 12px 14px;
  font-family: inherit;
  font-size: 1rem;
  line-height: 1.4;
  color: var(--color-form-heading);
  background: var(--color-white);
  border: 1px solid var(--color-form-border);
  border-radius: var(--radius);
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.giveaway-form input::placeholder,
.giveaway-form select:invalid {
  color: var(--color-form-placeholder);
}

.giveaway-form input:focus,
.giveaway-form select:focus {
  border-color: var(--color-blue-500);
  outline: none;
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.2);
}

.interest-btns {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.interest-btn {
  display: inline-flex;
  align-items: center;
  padding: 10px 16px;
  font-size: 0.875rem;
  font-weight: 400;
  color: var(--color-form-heading);
  background: var(--color-white);
  border: 1px solid var(--color-form-border);
  border-radius: var(--radius);
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.04);
  cursor: pointer;
  transition: background 0.2s ease, border-color 0.2s ease;
}

.interest-btn input {
  position: absolute;
  opacity: 0;
  width: 0;
  height: 0;
}

.interest-btn:has(input:checked) {
  background: var(--color-blue-100);
  border-color: var(--color-blue-300);
  color: var(--color-blue-700);
}

.interest-btn:hover {
  background: var(--color-blue-50);
  border-color: var(--color-blue-200);
}

.form-actions {
  margin-top: 1.5rem;
  padding-top: 1rem;
}

.form-actions .btn {
  margin-bottom: 12px;
}

.form-helper {
  margin: 0;
  font-size: 0.8125rem;
  line-height: 1.4;
  text-align: center;
  color: var(--color-form-helper);
}

/* 4. WHY DO WE DO THIS */
.section--why {
  background: linear-gradient(180deg, #f0f6fc 0%, #e8f2fc 100%);
}

.section--why .section__title {
  color: var(--color-why-heading);
}

.info-card {
  max-width: 42rem;
  margin: 0 auto;
  padding: 2rem;
  background: var(--color-white);
  border-radius: var(--radius);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
}

.info-card p {
  margin: 0 0 1rem;
  font-size: 1rem;
  line-height: 1.6;
  font-weight: 400;
  color: var(--color-why-text);
}

.info-card p:last-of-type {
  margin-bottom: 0;
}

.info-card__subhead {
  margin-top: 1.25rem;
  margin-bottom: 0.5rem;
}

.info-card__subhead strong {
  font-weight: 700;
  color: var(--color-why-text);
}

.info-card__divider {
  margin: 1.25rem 0;
  border: 0;
  border-top: 1px solid var(--color-why-divider);
}

.info-card__emphasis {
  margin-bottom: 0;
}

.info-card__emphasis strong {
  font-weight: 700;
  color: var(--color-why-text);
}

.bullet-list {
  margin: 0.5rem 0 0;
  padding: 0;
  list-style: none;
}

.bullet-list li {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 10px;
  font-size: 1rem;
  line-height: 1.5;
  font-weight: 400;
  color: var(--color-why-text);
}

.bullet-list__icon {
  flex-shrink: 0;
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(99, 153, 227, 0.15);
  border: 1px solid var(--color-why-icon);
  border-radius: 50%;
  color: var(--color-why-icon);
}


/* 5. WHEN WILL YOU HEAR FROM US */
.section--when .section__title {
  color: #1a1a1a;
}

.when-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
  margin-bottom: 2rem;
}

@media (min-width: 640px) {
  .when-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.when-item {
  text-align: center;
  padding: 1.5rem 1rem;
  background: var(--color-white);
  border-radius: var(--radius);
  box-shadow: var(--shadow-soft);
}

.when-item__icon {
  width: 56px;
  height: 56px;
  margin: 0 auto 1rem;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-when-icon-bg);
  border-radius: 50%;
  color: var(--color-when-icon);
}

.when-item__title {
  margin: 0 0 8px;
  font-size: 1.125rem;
  font-weight: 700;
  color: #1a1a1a;
}

.when-item__desc {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.5;
  color: var(--color-gray-600);
}

.when-footer-box {
  max-width: 36rem;
  margin: 0 auto;
  text-align: center;
  padding: 1.25rem 1.5rem;
  background: var(--color-when-box-bg);
  border-radius: var(--radius);
}

.when-footer-box__title {
  margin: 0 0 6px;
  font-size: 1rem;
  font-weight: 700;
  color: #1e3a5f;
}

.when-footer-box__text {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.6;
  color: #4a6b88;
}

/* 6. FINAL CTA */
.section--cta {
  background: var(--color-cta-bg);
  text-align: center;
}

.cta__title {
  margin: 0 0 12px;
  font-size: 1.75rem;
  font-weight: 700;
  line-height: 1.25;
  color: var(--color-white);
}

@media (min-width: 640px) {
  .cta__title {
    font-size: 2.25rem;
  }
}

.cta__subtext {
  margin: 0 0 8px;
  font-size: 1.0625rem;
  line-height: 1.5;
  color: var(--color-blue-100);
}

.cta__subtext:last-of-type {
  margin-bottom: 1.5rem;
}

/* 7. FOOTER */
.footer {
  padding: 1rem 0;
  background: #1a1d24;
}

.footer__inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.footer__text {
  margin: 0;
  font-size: 0.8125rem;
  line-height: 1.5;
  color: var(--color-white);
  text-align: left;
}

.footer__badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 12px;
  background: #0d0d0d;
  border-radius: 999px;
  color: var(--color-white);
  font-size: 0.75rem;
  font-weight: 500;
  text-decoration: none;
  flex-shrink: 0;
  transition: opacity 0.2s ease;
}

.footer__badge:hover {
  opacity: 0.9;
}

.footer__badge-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-white);
}

.footer__badge-text {
  white-space: nowrap;
}