/* ============================================================
   VARIABLES & RESET
   ============================================================ */
:root {
  --orange: #F05A28;
  --orange-dark: #C8431A;
  --orange-light: #F9E8E2;
  --black: #0F0F0F;
  --grey-900: #1A1A1A;
  --grey-700: #4A4A4A;
  --grey-500: #7A7A7A;
  --grey-200: #E8E8E8;
  --grey-100: #F5F5F3;
  --white: #FFFFFF;

  --font-heading: 'Montserrat', sans-serif;
  --font-body: 'Lato', sans-serif;

  --max-width: 1200px;
  --gutter: 2rem;
  --section-gap: 6rem;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { font-size: 16px; scroll-behavior: smooth; }

body {
  font-family: var(--font-body);
  font-weight: 300;
  color: var(--black);
  background: var(--white);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }

/* ============================================================
   TYPOGRAPHY
   ============================================================ */
h1, h2, h3, h4 {
  font-family: var(--font-heading);
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -0.02em;
}

h1 { font-size: clamp(2.2rem, 5vw, 3.8rem); }
h2 { font-size: clamp(1.6rem, 3.5vw, 2.6rem); }
h3 { font-size: clamp(1.1rem, 2vw, 1.4rem); font-weight: 600; }

p { margin-bottom: 1.25rem; }
p:last-child { margin-bottom: 0; }

/* ============================================================
   LAYOUT
   ============================================================ */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--gutter);
}

/* ============================================================
   HEADER
   ============================================================ */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--white);
  border-bottom: 1px solid var(--grey-200);
}

.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
  gap: 2rem;
}

.site-logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  flex-shrink: 0;
}

.logo-name {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1.05rem;
  letter-spacing: -0.01em;
  color: var(--black);
}

.logo-rule {
  display: block;
  width: 1px;
  height: 1.2rem;
  background: var(--orange);
}

.logo-sub {
  font-family: var(--font-body);
  font-size: 0.75rem;
  font-weight: 400;
  color: var(--grey-500);
  letter-spacing: 0.02em;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 0.25rem;
}

.nav-link {
  font-family: var(--font-heading);
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--grey-700);
  padding: 0.5rem 0.75rem;
  border-radius: 4px;
  transition: color 0.2s, background 0.2s;
  letter-spacing: 0.01em;
}

.nav-link:hover,
.nav-link--active {
  color: var(--orange);
}

.nav-cta {
  font-family: var(--font-heading);
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--white);
  background: var(--orange);
  padding: 0.5rem 1.1rem;
  border-radius: 4px;
  margin-left: 0.5rem;
  transition: background 0.2s;
  letter-spacing: 0.01em;
}

.nav-cta:hover { background: var(--orange-dark); }

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}

.nav-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--black);
  transition: transform 0.2s;
}

/* ============================================================
   BUTTONS
   ============================================================ */
.btn {
  display: inline-block;
  font-family: var(--font-heading);
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  padding: 0.8rem 1.6rem;
  border-radius: 4px;
  transition: all 0.2s;
  cursor: pointer;
}

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

.btn--secondary {
  background: var(--white);
  color: var(--orange);
  border: 2px solid var(--orange);
}
.btn--secondary:hover {
  background: var(--orange);
  color: var(--white);
}

.btn--ghost {
  background: transparent;
  color: var(--grey-700);
  border: 2px solid var(--grey-200);
}
.btn--ghost:hover {
  border-color: var(--grey-700);
  color: var(--black);
}

/* ============================================================
   HERO
   ============================================================ */
.hero {
  padding: 6rem 0 5rem;
  background: var(--grey-100);
  overflow: hidden;
  position: relative;
}

.hero .container {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 4rem;
  align-items: center;
}

.hero-headline {
  color: var(--black);
  margin-bottom: 1.75rem;
  max-width: 18ch;
}

.hero-body {
  color: var(--grey-700);
  font-size: 1.05rem;
  max-width: 52ch;
  margin-bottom: 1rem;
}

.hero-actions {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
  margin-top: 2.5rem;
}

.hero-mark {
  align-self: stretch;
  display: flex;
  align-items: stretch;
}

.hero-wave {
  width: auto;
  height: 100%;
  display: block;
}

/* ============================================================
   INTRO STRIP
   ============================================================ */
.intro-strip {
  background: var(--orange);
  padding: 1rem 0;
}

.intro-strip-inner {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1.5rem;
  flex-wrap: wrap;
}

.strip-link {
  font-family: var(--font-heading);
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--white);
  letter-spacing: 0.05em;
  text-transform: uppercase;
  opacity: 0.9;
  transition: opacity 0.2s;
}
.strip-link:hover { opacity: 1; }

.strip-divider {
  color: rgba(255,255,255,0.4);
  font-size: 0.7rem;
}

/* ============================================================
   CONCEPTS SECTION
   ============================================================ */
.concepts {
  padding: var(--section-gap) 0;
}

.section-title {
  text-align: center;
  margin-bottom: 3.5rem;
  color: var(--black);
}

.concepts-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.5rem;
}

.concept-card {
  padding: 2rem 1.75rem;
  border: 1px solid var(--grey-200);
  border-radius: 6px;
  position: relative;
  transition: border-color 0.2s, box-shadow 0.2s;
}

.concept-card:hover {
  border-color: var(--orange);
  box-shadow: 0 4px 24px rgba(240, 90, 40, 0.08);
}

.concept-number {
  display: block;
  font-family: var(--font-heading);
  font-size: 0.7rem;
  font-weight: 700;
  color: var(--orange);
  letter-spacing: 0.1em;
  margin-bottom: 1rem;
}

.concept-card h3 {
  margin-bottom: 0.75rem;
  color: var(--black);
}

.concept-card p {
  font-size: 0.9rem;
  color: var(--grey-700);
  margin-bottom: 0;
}

.concepts-cta {
  text-align: center;
  margin-top: 3rem;
}

/* ============================================================
   WORKSHEET FEATURE
   ============================================================ */
.worksheet-feature {
  background: var(--grey-900);
  padding: var(--section-gap) 0;
  color: var(--white);
}

.worksheet-feature-inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 5rem;
  align-items: center;
}

.worksheet-feature-text h2 {
  color: var(--white);
  margin-bottom: 1.25rem;
}

.worksheet-feature-text p {
  color: rgba(255,255,255,0.7);
  margin-bottom: 2rem;
}

.worksheet-preview {
  border: 1px solid rgba(255,255,255,0.15);
  border-radius: 6px;
  overflow: hidden;
  font-family: var(--font-heading);
  font-size: 0.7rem;
}

.wp-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  border-bottom: 1px solid rgba(255,255,255,0.1);
}

.wp-row:last-child { border-bottom: none; }

.wp-cell {
  padding: 1rem;
  border-right: 1px solid rgba(255,255,255,0.1);
  color: rgba(255,255,255,0.6);
  font-weight: 500;
  letter-spacing: 0.02em;
  min-height: 80px;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
}

.wp-cell:last-child { border-right: none; }

.wp-row--header .wp-cell {
  background: rgba(240, 90, 40, 0.2);
  color: rgba(255,255,255,0.9);
  font-weight: 600;
  min-height: 50px;
}

/* ============================================================
   PAGE LAYOUT
   ============================================================ */
.page-header {
  background: var(--grey-100);
  padding: 4rem 0 3rem;
  border-bottom: 3px solid var(--orange);
}

.page-title {
  color: var(--black);
}

.page-subtitle {
  font-size: 1.15rem;
  color: var(--grey-700);
  margin-top: 0.75rem;
  max-width: 52ch;
}

.page-body {
  padding: 4rem 0 6rem;
  background: url('/img/resonance-wave.svg') no-repeat right top;
  background-size: 50% auto;
}

/* ============================================================
   PROSE
   ============================================================ */
.prose {
  max-width: 72ch;
}

.prose h2 {
  margin-top: 3rem;
  margin-bottom: 1rem;
  padding-top: 2rem;
  border-top: 1px solid var(--grey-200);
  font-size: 1.5rem;
}

.prose h2:first-child {
  margin-top: 0;
  padding-top: 0;
  border-top: none;
}

.prose h3 {
  margin-top: 2rem;
  margin-bottom: 0.75rem;
  color: var(--orange);
}

.prose p {
  color: var(--grey-700);
  font-size: 1.02rem;
}

.prose strong {
  color: var(--black);
  font-weight: 700;
}

.prose ul, .prose ol {
  padding-left: 1.5rem;
  margin-bottom: 1.25rem;
}

.prose li {
  color: var(--grey-700);
  margin-bottom: 0.4rem;
  font-size: 1.02rem;
}

.prose a {
  color: var(--orange);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.prose .btn {
  margin-top: 1.5rem;
  text-decoration: none;
}

.prose hr {
  border: none;
  border-top: 1px solid var(--grey-200);
  margin: 2.5rem 0;
}

/* About profile */
.about-profile {
  display: flex;
  align-items: center;
  gap: 2rem;
  margin-bottom: 3rem;
}

.about-photo {
  width: 120px;
  height: 120px;
  object-fit: cover;
  border-radius: 50%;
  flex-shrink: 0;
}

.about-identity {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.about-name {
  font-family: var(--font-heading);
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--black);
  letter-spacing: -0.01em;
}

.about-credentials {
  font-family: var(--font-heading);
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--orange);
  letter-spacing: 0.04em;
}

.about-role {
  font-size: 0.9rem;
  color: var(--grey-500);
}


/* Book list styling */
.prose .book-list {
  list-style: none;
  padding: 0;
  margin: 1.5rem 0 2rem;
}

.prose .book-list li {
  padding: 0.75rem 0;
  border-bottom: 1px solid var(--grey-200);
  font-size: 1rem;
}

/* ============================================================
   FOOTER
   ============================================================ */
.site-footer {
  background: var(--grey-900);
  color: var(--white);
  position: relative;
}

.wave-divider {
  color: var(--grey-100);
  line-height: 0;
  overflow: hidden;
  height: 40px;
}

.wave-divider svg {
  width: 100%;
  height: 100%;
}

.site-footer .container {
  padding-top: 3rem;
  padding-bottom: 3rem;
}

.footer-inner {
  display: grid;
  grid-template-columns: 1fr auto auto;
  gap: 4rem;
  align-items: start;
}

.footer-name {
  display: block;
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1.1rem;
  margin-bottom: 0.4rem;
}

.footer-tagline {
  display: block;
  font-size: 0.8rem;
  color: rgba(255,255,255,0.5);
}

.footer-nav {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.footer-nav a {
  font-size: 0.85rem;
  color: rgba(255,255,255,0.65);
  transition: color 0.2s;
}

.footer-nav a:hover { color: var(--orange); }

.footer-contact {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  text-align: right;
}

.footer-contact a {
  font-size: 0.85rem;
  color: var(--orange);
}

.footer-linkedin::before {
  content: '·';
  margin-right: 0.5rem;
  color: rgba(255,255,255,0.3);
}

.footer-studio {
  font-size: 0.75rem;
  color: rgba(255,255,255,0.35);
  letter-spacing: 0.05em;
}

/* ============================================================
   RESPONSIVE
   ============================================================ */
@media (max-width: 1024px) {
  .concepts-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  :root { --section-gap: 4rem; }

  .site-nav {
    display: none;
    position: absolute;
    top: 72px;
    left: 0;
    right: 0;
    background: var(--white);
    flex-direction: column;
    align-items: stretch;
    padding: 1rem var(--gutter);
    border-bottom: 1px solid var(--grey-200);
    gap: 0.25rem;
    z-index: 99;
  }

  .site-nav.is-open { display: flex; }

  .nav-toggle { display: flex; }

  .logo-sub,
  .logo-rule { display: none; }

  .hero .container {
    grid-template-columns: 1fr;
  }

  .hero-wave { display: none; }

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

  .hero-actions .btn {
    width: 100%;
    text-align: center;
  }

  .worksheet-feature-inner {
    grid-template-columns: 1fr;
    gap: 3rem;
  }

  .worksheet-preview {
    display: none;
  }

  .footer-inner {
    grid-template-columns: 1fr;
    gap: 2rem;
  }

  .footer-contact { text-align: left; }

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

  .page-body {
    background-image: none;
  }

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

.prose {
  overflow-wrap: break-word;
}