/* ===== DESIGN TOKENS ===== */
:root {
  /* Type Scale */
  --text-xs:   clamp(0.75rem,  0.7rem  + 0.25vw, 0.875rem);
  --text-sm:   clamp(0.875rem, 0.8rem  + 0.35vw, 1rem);
  --text-base: clamp(1rem,     0.95rem + 0.25vw, 1.125rem);
  --text-lg:   clamp(1.125rem, 1rem    + 0.75vw, 1.5rem);
  --text-xl:   clamp(1.5rem,   1.2rem  + 1.25vw, 2.25rem);
  --text-2xl:  clamp(2rem,     1.2rem  + 2.5vw,  3.5rem);

  /* Spacing */
  --space-1:  0.25rem;
  --space-2:  0.5rem;
  --space-3:  0.75rem;
  --space-4:  1rem;
  --space-5:  1.25rem;
  --space-6:  1.5rem;
  --space-8:  2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;
  --space-24: 6rem;
  --space-32: 8rem;

  /* Content widths */
  --content-narrow: 640px;
  --content-default: 960px;
  --content-wide: 1200px;

  /* Radius */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-full: 9999px;

  /* Transitions */
  --transition-interactive: 180ms cubic-bezier(0.16, 1, 0.3, 1);

  /* Fonts */
  --font-display: 'General Sans', 'Helvetica Neue', sans-serif;
  --font-body: 'DM Sans', 'Helvetica Neue', sans-serif;
}

/* ===== LIGHT MODE (default) ===== */
:root, [data-theme="light"] {
  --color-bg:             #FAFAF8;
  --color-surface:        #FFFFFF;
  --color-surface-2:      #F5F5F3;
  --color-border:         #E0DFDB;
  --color-text:           #1A1A1A;
  --color-text-muted:     #6B6B6B;
  --color-text-faint:     #A0A0A0;
  --color-primary:        #0B6E99;
  --color-primary-hover:  #085A7D;
  --color-primary-light:  #E8F4FA;
  --color-accent:         #0FA68E;
  --color-accent-light:   #E6F7F4;
  --shadow-sm: 0 1px 2px oklch(0.2 0.01 80 / 0.06);
  --shadow-md: 0 4px 12px oklch(0.2 0.01 80 / 0.08);
  --shadow-lg: 0 12px 32px oklch(0.2 0.01 80 / 0.12);
}

/* ===== DARK MODE ===== */
[data-theme="dark"] {
  --color-bg:             #111111;
  --color-surface:        #1A1A1A;
  --color-surface-2:      #222222;
  --color-border:         #333333;
  --color-text:           #E0E0E0;
  --color-text-muted:     #999999;
  --color-text-faint:     #666666;
  --color-primary:        #4DB8E0;
  --color-primary-hover:  #3AA0C8;
  --color-primary-light:  #1A2A33;
  --color-accent:         #3DD4B5;
  --color-accent-light:   #1A2E2A;
  --shadow-sm: 0 1px 2px oklch(0 0 0 / 0.2);
  --shadow-md: 0 4px 12px oklch(0 0 0 / 0.3);
  --shadow-lg: 0 12px 32px oklch(0 0 0 / 0.4);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme]) {
    --color-bg:             #111111;
    --color-surface:        #1A1A1A;
    --color-surface-2:      #222222;
    --color-border:         #333333;
    --color-text:           #E0E0E0;
    --color-text-muted:     #999999;
    --color-text-faint:     #666666;
    --color-primary:        #4DB8E0;
    --color-primary-hover:  #3AA0C8;
    --color-primary-light:  #1A2A33;
    --color-accent:         #3DD4B5;
    --color-accent-light:   #1A2E2A;
    --shadow-sm: 0 1px 2px oklch(0 0 0 / 0.2);
    --shadow-md: 0 4px 12px oklch(0 0 0 / 0.3);
    --shadow-lg: 0 12px 32px oklch(0 0 0 / 0.4);
  }
}

/* ===== LAYOUT ===== */
.container {
  max-width: var(--content-wide);
  margin-inline: auto;
  padding-inline: var(--space-4);
}

.container--narrow {
  max-width: var(--content-narrow);
}

.container--default {
  max-width: var(--content-default);
}

/* ===== HEADER ===== */
.header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: oklch(from var(--color-bg) l c h / 0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
  transition: box-shadow 0.3s ease;
}
.header--scrolled { box-shadow: var(--shadow-sm); }

.header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-3) var(--space-4);
  max-width: var(--content-wide);
  margin-inline: auto;
}

.header__logo {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  text-decoration: none;
  color: var(--color-text);
}

.header__logo svg { width: 32px; height: 32px; }

.header__logo-text {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: var(--text-lg);
  letter-spacing: -0.02em;
}

.header__nav {
  display: flex;
  align-items: center;
  gap: var(--space-4);
}

.header__link {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  text-decoration: none;
  font-weight: 500;
  padding: var(--space-1) var(--space-2);
  border-radius: var(--radius-sm);
}
.header__link:hover { color: var(--color-text); }

.header__controls {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.lang-toggle {
  display: flex;
  align-items: center;
  background: var(--color-surface-2);
  border-radius: var(--radius-full);
  padding: 2px;
  font-size: var(--text-xs);
  font-weight: 600;
}

.lang-toggle__btn {
  padding: var(--space-1) var(--space-3);
  border-radius: var(--radius-full);
  color: var(--color-text-muted);
  font-size: var(--text-xs);
  font-weight: 600;
}
.lang-toggle__btn.active {
  background: var(--color-primary);
  color: #FFFFFF;
}

.theme-toggle {
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-md);
  color: var(--color-text-muted);
}
.theme-toggle:hover { color: var(--color-text); background: var(--color-surface-2); }

/* Mobile hamburger */
.hamburger {
  display: none;
  width: 36px;
  height: 36px;
  align-items: center;
  justify-content: center;
  color: var(--color-text);
}

@media (max-width: 768px) {
  .header__nav {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    flex-direction: column;
    background: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    padding: var(--space-4);
    gap: var(--space-2);
    box-shadow: var(--shadow-md);
  }
  .header__nav.open { display: flex; }
  .hamburger { display: flex; }
}

/* ===== HERO ===== */
.hero {
  position: relative;
  min-height: 70vh;
  display: flex;
  align-items: center;
  overflow: hidden;
}

.hero--split {
  max-width: var(--content-wide);
  margin-inline: auto;
  padding: var(--space-12) var(--space-4);
  gap: var(--space-8);
  min-height: auto;
}

.hero__content {
  position: relative;
  z-index: 1;
  flex: 1;
  min-width: 0;
}

.hero__illustration {
  flex: 0 0 auto;
  max-width: 420px;
}

.hero__illustration img {
  width: 100%;
  height: auto;
}

.hero__img--dark {
  display: none;
}

[data-theme="dark"] .hero__img--light {
  display: none;
}

[data-theme="dark"] .hero__img--dark {
  display: block;
}

@media (max-width: 768px) {
  .hero--split {
    flex-direction: column;
    padding: var(--space-8) var(--space-4);
    text-align: center;
  }
  .hero__illustration {
    max-width: 320px;
    margin-inline: auto;
  }
  .hero__actions {
    justify-content: center;
  }
}

.hero__badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  background: var(--color-primary-light);
  color: var(--color-primary);
  padding: var(--space-1) var(--space-3);
  border-radius: var(--radius-full);
  font-size: var(--text-xs);
  font-weight: 600;
  margin-bottom: var(--space-6);
}

.hero__title {
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.1;
  max-width: 18ch;
  margin-bottom: var(--space-4);
}

.hero__subtitle {
  font-size: var(--text-base);
  color: var(--color-text-muted);
  max-width: 48ch;
  margin-bottom: var(--space-8);
}

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
}

/* ===== BUTTONS ===== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-family: var(--font-body);
  font-size: var(--text-sm);
  font-weight: 600;
  padding: var(--space-3) var(--space-6);
  border-radius: var(--radius-md);
  text-decoration: none;
  white-space: nowrap;
}

.btn--primary {
  background: var(--color-primary);
  color: #FFFFFF;
}
.btn--primary:hover { background: var(--color-primary-hover); }
.btn--primary:active { transform: scale(0.98); }

.btn--secondary {
  background: var(--color-surface);
  color: var(--color-text);
  border: 1px solid var(--color-border);
}
.btn--secondary:hover { background: var(--color-surface-2); }

.btn--ghost {
  background: transparent;
  color: var(--color-primary);
}
.btn--ghost:hover { background: var(--color-primary-light); }

/* ===== ARTICLES SECTION ===== */
.section {
  padding: clamp(var(--space-12), 6vw, var(--space-24)) 0;
}

.section--alt { background: var(--color-surface-2); }

.section__header {
  text-align: left;
  margin-bottom: var(--space-10);
}

.section__title {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: var(--space-2);
}

.section__subtitle {
  color: var(--color-text-muted);
  font-size: var(--text-sm);
}

/* Article Cards Grid */
.articles-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(min(300px, 100%), 1fr));
  gap: var(--space-6);
}

.article-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  cursor: pointer;
  transition: box-shadow var(--transition-interactive), transform var(--transition-interactive);
}
.article-card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.article-card__tag {
  display: inline-block;
  font-size: var(--text-xs);
  font-weight: 600;
  color: var(--color-primary);
  background: var(--color-primary-light);
  padding: 2px var(--space-2);
  border-radius: var(--radius-sm);
  margin-bottom: var(--space-3);
}

.article-card__title {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 600;
  margin-bottom: var(--space-2);
  letter-spacing: -0.01em;
}

.article-card__excerpt {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  line-height: 1.5;
  margin-bottom: var(--space-3);
}

.article-card__meta {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-xs);
  color: var(--color-text-faint);
}

/* ===== ARTICLE DETAIL VIEW ===== */
.article-view {
  display: none;
}
.article-view.active { display: block; }

.article-view__back {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  color: var(--color-primary);
  font-size: var(--text-sm);
  font-weight: 500;
  cursor: pointer;
  margin-bottom: var(--space-6);
  padding: var(--space-2) 0;
}
.article-view__back:hover { text-decoration: underline; }

.article-view__content {
  max-width: 65ch;
}

.article-view__content h2 {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 700;
  margin-bottom: var(--space-4);
  letter-spacing: -0.02em;
}

.article-view__content h3 {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 600;
  margin-top: var(--space-8);
  margin-bottom: var(--space-3);
}

.article-view__content p {
  margin-bottom: var(--space-4);
  line-height: 1.7;
  color: var(--color-text);
}

.article-view__content ul, .article-view__content ol {
  margin-bottom: var(--space-4);
  padding-left: var(--space-6);
}
.article-view__content li {
  margin-bottom: var(--space-2);
  line-height: 1.6;
}

/* ===== CHECKLIST SECTION ===== */
.checklist-section {
  background: linear-gradient(135deg, var(--color-primary-light) 0%, var(--color-accent-light) 100%);
  border-radius: var(--radius-xl);
  padding: var(--space-10);
  display: flex;
  align-items: center;
  gap: var(--space-10);
}

.checklist-section__content { flex: 1; }

.checklist-section__title {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 700;
  margin-bottom: var(--space-3);
}

.checklist-section__desc {
  color: var(--color-text-muted);
  margin-bottom: var(--space-6);
  max-width: 50ch;
}

.checklist-preview {
  flex: 0 0 280px;
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  padding: var(--space-5);
  box-shadow: var(--shadow-md);
}

.checklist-preview__title {
  font-weight: 600;
  font-size: var(--text-sm);
  margin-bottom: var(--space-3);
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.checklist-preview__item {
  display: flex;
  align-items: flex-start;
  gap: var(--space-2);
  padding: var(--space-2) 0;
  font-size: var(--text-xs);
  color: var(--color-text-muted);
}

.checklist-preview__check {
  width: 16px;
  height: 16px;
  border: 1.5px solid var(--color-border);
  border-radius: 3px;
  flex-shrink: 0;
  margin-top: 1px;
}

@media (max-width: 768px) {
  .checklist-section {
    flex-direction: column;
    padding: var(--space-6);
  }
  .checklist-preview { flex: unset; width: 100%; }
}

/* ===== LEAD FORM ===== */
.form-section {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: var(--space-10);
}

.form-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-4);
}

@media (max-width: 640px) {
  .form-grid { grid-template-columns: 1fr; }
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

.form-group--full {
  grid-column: 1 / -1;
}

.form-label {
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text);
}

.form-input, .form-select, .form-textarea {
  padding: var(--space-3) var(--space-4);
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  font-size: var(--text-base);
  color: var(--color-text);
}

.form-input:focus, .form-select:focus, .form-textarea:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px oklch(from var(--color-primary) l c h / 0.15);
}

.form-textarea {
  resize: vertical;
  min-height: 100px;
}

.form-select {
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' fill='%236B6B6B' viewBox='0 0 16 16'%3E%3Cpath d='M8 11.5l-5-5h10l-5 5z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 12px center;
  padding-right: var(--space-8);
}

.form-success {
  display: none;
  text-align: center;
  padding: var(--space-10);
}

.form-success.active { display: block; }
.form-success__icon {
  width: 56px;
  height: 56px;
  background: var(--color-accent-light);
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto var(--space-4);
  color: var(--color-accent);
}

.form-success__title {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 600;
  margin-bottom: var(--space-2);
}

.form-success__desc {
  color: var(--color-text-muted);
  font-size: var(--text-sm);
}

/* ===== NORWOOD SCALE SECTION ===== */
.norwood-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
  gap: var(--space-4);
}

.norwood-card {
  text-align: center;
  padding: var(--space-4);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
}

.norwood-card__stage {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: var(--text-lg);
  color: var(--color-primary);
  margin-bottom: var(--space-1);
}

.norwood-card__label {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
}

/* ===== FOOTER ===== */
.footer {
  border-top: 1px solid var(--color-border);
  padding: var(--space-8) 0;
  margin-top: var(--space-12);
}

.footer__inner {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  flex-wrap: wrap;
  gap: var(--space-4);
}

.footer__left {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

.footer__copy {
  font-size: var(--text-xs);
  color: var(--color-text-faint);
}

.footer__email {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  text-decoration: none;
}
.footer__email:hover { color: var(--color-primary); }

.footer__links {
  display: flex;
  gap: var(--space-4);
  flex-wrap: wrap;
}

.footer__link {
  font-size: var(--text-xs);
  color: var(--color-text-faint);
  text-decoration: none;
}
.footer__link:hover { color: var(--color-text-muted); }

/* ===== APP BADGES ===== */
.app-badges {
  text-align: center;
  padding-top: var(--space-4);
}

.app-badges__row {
  display: flex;
  justify-content: center;
  align-items: flex-start;
  gap: var(--space-6);
  flex-wrap: wrap;
}

.app-badge {
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-2);
  text-decoration: none;
  transition: opacity 0.2s ease;
}

.app-badge:hover {
  opacity: 0.85;
}

.app-badge img {
  height: 56px;
  width: auto;
}

.app-badge--coming {
  cursor: default;
}

.app-badge__soon {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  font-weight: 500;
  letter-spacing: 0.03em;
}

@media (max-width: 768px) {
  .app-badges__row {
    gap: var(--space-4);
  }
  .app-badge img {
    height: 48px;
  }
}

/* ===== PARTNERSHIP ===== */
.partnership {
  text-align: center;
  padding: var(--space-8) var(--space-4);
  border-top: 1px solid var(--color-border);
}

.partnership__title {
  font-size: var(--text-lg);
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: var(--space-2);
}

.partnership__text {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  max-width: 520px;
  margin-inline: auto;
  margin-bottom: var(--space-4);
  line-height: 1.6;
}

.btn--sm {
  font-size: var(--text-sm);
  padding: var(--space-2) var(--space-4);
}

/* ===== ANIMATIONS ===== */
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(12px); }
  to { opacity: 1; transform: translateY(0); }
}

.fade-in {
  opacity: 0;
  animation: fadeIn 0.5s ease forwards;
}

/* ===== SCROLL REVEAL ===== */
[data-reveal] {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
[data-reveal].revealed {
  opacity: 1;
  transform: translateY(0);
}

/* ===== UTILS ===== */
.hide { display: none !important; }