/* ME & THEM — A Place of Words */
/* Rebuilt: Editorial, accessible, balanced. Black/white/blue palette. */

@import url('https://api.fontshare.com/v2/css?f[]=clash-display@400,500,600,700&f[]=satoshi@300,400,500,700&display=swap');

:root {
  --font-display: 'Clash Display', 'Helvetica Neue', sans-serif;
  --font-body: 'Satoshi', 'Helvetica Neue', sans-serif;

  --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);
  --text-3xl:  clamp(2.5rem,   1rem    + 4vw,    5rem);
  --text-hero: clamp(3rem,     0.5rem  + 7vw,    8rem);

  --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;

  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --transition-interactive: 180ms cubic-bezier(0.16, 1, 0.3, 1);

  --content-narrow: 640px;
  --content-default: 960px;
  --content-wide: 1200px;
}

/* ==================== COLOR SYSTEM ==================== */
:root, [data-theme="light"] {
  --color-bg: #fafaf8;
  --color-surface: #ffffff;
  --color-surface-alt: #111111;
  --color-divider: #e2e0dc;
  --color-border: #d4d1ca;
  --color-text: #1a1a1a;
  --color-text-secondary: #4a4a4a;
  --color-text-muted: #717171;
  --color-text-on-dark: #f0f0ee;
  --color-text-on-dark-muted: #a0a09c;
  --color-primary: #2563eb;
  --color-primary-hover: #1d4ed8;
  --color-primary-soft: rgba(37, 99, 235, 0.08);
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.06);
  --shadow-md: 0 4px 16px rgba(0,0,0,0.08);
  --shadow-lg: 0 16px 48px rgba(0,0,0,0.1);
  --shadow-cover: 0 24px 64px rgba(0,0,0,0.18), 0 8px 20px rgba(0,0,0,0.08);
}

[data-theme="dark"] {
  --color-bg: #0e0e0c;
  --color-surface: #1a1a18;
  --color-surface-alt: #222220;
  --color-divider: #2a2a28;
  --color-border: #3a3a38;
  --color-text: #ededeb;
  --color-text-secondary: #c0c0bc;
  --color-text-muted: #8a8a86;
  --color-text-on-dark: #ededeb;
  --color-text-on-dark-muted: #8a8a86;
  --color-primary: #3b82f6;
  --color-primary-hover: #60a5fa;
  --color-primary-soft: rgba(59, 130, 246, 0.12);
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.2);
  --shadow-md: 0 4px 16px rgba(0,0,0,0.3);
  --shadow-lg: 0 16px 48px rgba(0,0,0,0.4);
  --shadow-cover: 0 24px 64px rgba(0,0,0,0.5), 0 8px 20px rgba(0,0,0,0.3);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme]) {
    --color-bg: #0e0e0c;
    --color-surface: #1a1a18;
    --color-surface-alt: #222220;
    --color-divider: #2a2a28;
    --color-border: #3a3a38;
    --color-text: #ededeb;
    --color-text-secondary: #c0c0bc;
    --color-text-muted: #8a8a86;
    --color-text-on-dark: #ededeb;
    --color-text-on-dark-muted: #8a8a86;
    --color-primary: #3b82f6;
    --color-primary-hover: #60a5fa;
    --color-primary-soft: rgba(59, 130, 246, 0.12);
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.2);
    --shadow-md: 0 4px 16px rgba(0,0,0,0.3);
    --shadow-lg: 0 16px 48px rgba(0,0,0,0.4);
    --shadow-cover: 0 24px 64px rgba(0,0,0,0.5), 0 8px 20px rgba(0,0,0,0.3);
  }
}

/* ==================== GLOBAL ==================== */
body { overflow-x: hidden; }

/* Utility: section label */
.section-label {
  font-family: var(--font-body);
  font-size: var(--text-xs);
  font-weight: 500;
  letter-spacing: 0.25em;
  text-transform: uppercase;
  color: var(--color-primary);
  margin-bottom: var(--space-4);
}

/* Utility: section heading */
.section-heading {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: var(--space-6);
  line-height: 1.3;
}

/* ==================== NAV ==================== */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--space-4) var(--space-8);
  background: transparent;
  transition: background 0.4s ease, box-shadow 0.4s ease;
}

.nav.scrolled {
  background: oklch(from var(--color-bg) l c h / 0.92);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  box-shadow: var(--shadow-sm);
}

.nav__brand {
  font-family: var(--font-display);
  font-size: var(--text-sm);
  font-weight: 600;
  letter-spacing: 0.08em;
  color: var(--color-text);
  text-decoration: none;
}

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

.nav__link {
  font-family: var(--font-body);
  font-size: var(--text-xs);
  font-weight: 500;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-text-secondary);
  text-decoration: none;
  padding: var(--space-2) var(--space-3);
}

.nav__link:hover {
  color: var(--color-primary);
}

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

/* ==================== HERO ==================== */
.hero {
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: var(--space-24) var(--space-6) var(--space-16);
  position: relative;
}

/* Subtle blue gradient glow behind the cover */
.hero::before {
  content: '';
  position: absolute;
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, rgba(37, 99, 235, 0.06) 0%, transparent 70%);
  top: 50%;
  left: 50%;
  transform: translate(-50%, -45%);
  pointer-events: none;
  z-index: 0;
}

[data-theme="dark"] .hero::before {
  background: radial-gradient(circle, rgba(59, 130, 246, 0.08) 0%, transparent 70%);
}

.hero__cover {
  position: relative;
  z-index: 1;
  max-width: 300px;
  width: 100%;
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-cover);
  margin-bottom: var(--space-10);
}

.hero__text {
  position: relative;
  z-index: 1;
}

.hero__label {
  font-family: var(--font-body);
  font-size: var(--text-xs);
  font-weight: 500;
  letter-spacing: 0.25em;
  text-transform: uppercase;
  color: var(--color-primary);
  margin-bottom: var(--space-4);
}

.hero__title {
  font-family: var(--font-display);
  font-size: var(--text-3xl);
  font-weight: 700;
  line-height: 1;
  color: var(--color-text);
  margin-bottom: var(--space-3);
}

.hero__title span {
  color: var(--color-primary);
}

.hero__tagline {
  font-family: var(--font-body);
  font-size: var(--text-lg);
  font-weight: 300;
  font-style: italic;
  color: var(--color-text-secondary);
  margin-bottom: var(--space-2);
}

.hero__author {
  font-family: var(--font-body);
  font-size: var(--text-sm);
  font-weight: 500;
  letter-spacing: 0.12em;
  color: var(--color-text-muted);
  margin-bottom: var(--space-8);
}

.hero__cta {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-8);
  background: var(--color-text);
  color: var(--color-bg);
  border-radius: var(--radius-sm);
  font-family: var(--font-body);
  font-size: var(--text-sm);
  font-weight: 600;
  letter-spacing: 0.06em;
  text-decoration: none;
  text-transform: uppercase;
  transition: background var(--transition-interactive), transform var(--transition-interactive);
}

.hero__cta:hover {
  background: var(--color-primary);
  color: #ffffff;
  transform: translateY(-1px);
}

.hero__cta:active {
  transform: translateY(0);
}

.hero__date {
  display: block;
  margin-top: var(--space-4);
  font-family: var(--font-body);
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  letter-spacing: 0.08em;
}

/* ==================== DIVIDER LINE ==================== */
.divider {
  width: 48px;
  height: 1px;
  background: var(--color-primary);
  margin: 0 auto;
  opacity: 0.4;
}

/* ==================== QUOTE SECTION ==================== */
.quote-section {
  padding: clamp(var(--space-16), 10vw, var(--space-24)) var(--space-6);
  text-align: center;
}

.quote-section__text {
  font-family: var(--font-body);
  font-size: var(--text-xl);
  font-weight: 300;
  font-style: italic;
  color: var(--color-text);
  max-width: 640px;
  margin: 0 auto var(--space-4);
  line-height: 1.5;
}

.quote-section__attribution {
  font-family: var(--font-body);
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

/* ==================== ABOUT THE BOOK ==================== */
.about {
  padding: clamp(var(--space-12), 8vw, var(--space-24)) var(--space-6);
  max-width: var(--content-narrow);
  margin: 0 auto;
  text-align: center;
}

.about__label { /* reuse section-label */ }

.about__heading {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: var(--space-6);
  line-height: 1.3;
}

.about__body {
  font-family: var(--font-body);
  font-size: var(--text-base);
  color: var(--color-text-secondary);
  line-height: 1.8;
  text-align: left;
}

.about__body p + p {
  margin-top: var(--space-4);
}

/* ==================== INSIDE THE BOOK — DARK PANEL ==================== */
.parts {
  padding: clamp(var(--space-16), 10vw, var(--space-24)) var(--space-6);
  background: #111111;
  color: #f0f0ee;
  margin: var(--space-16) 0;
}

[data-theme="dark"] .parts {
  background: #1a1a18;
}

.parts__inner {
  max-width: var(--content-default);
  margin: 0 auto;
  text-align: center;
}

.parts__label {
  font-family: var(--font-body);
  font-size: var(--text-xs);
  font-weight: 500;
  letter-spacing: 0.25em;
  text-transform: uppercase;
  color: var(--color-primary);
  margin-bottom: var(--space-4);
}

.parts__heading {
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  font-weight: 600;
  margin-bottom: var(--space-12);
  color: #f0f0ee;
}

.parts__grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-6);
  text-align: left;
}

.part-card {
  padding: var(--space-6) var(--space-8);
  border-left: 2px solid rgba(37, 99, 235, 0.3);
  transition: border-color var(--transition-interactive);
}

.part-card:hover {
  border-color: var(--color-primary);
}

.part-card__number {
  font-family: var(--font-body);
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--color-primary);
  margin-bottom: var(--space-2);
}

.part-card__title {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 600;
  margin-bottom: var(--space-2);
  color: #f0f0ee;
}

.part-card__desc {
  font-family: var(--font-body);
  font-size: var(--text-sm);
  color: #a0a09c;
  line-height: 1.7;
}

/* ==================== ABOUT THE AUTHOR ==================== */
.author {
  padding: clamp(var(--space-12), 8vw, var(--space-24)) var(--space-6);
  max-width: var(--content-default);
  margin: 0 auto;
}

.author__inner {
  display: grid;
  grid-template-columns: 1fr 240px;
  gap: var(--space-12);
  align-items: start;
}

.author__text {
  text-align: left;
}

.author__heading {
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: var(--space-6);
  line-height: 1.2;
}

.author__body {
  font-family: var(--font-body);
  font-size: var(--text-base);
  color: var(--color-text-secondary);
  line-height: 1.8;
}

.author__body p + p {
  margin-top: var(--space-4);
}

.author__brand-img {
  width: 100%;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-md);
  margin-top: var(--space-8);
}

/* ==================== SPEAKING & BOOKING ==================== */
.speaking {
  padding: clamp(var(--space-12), 8vw, var(--space-24)) var(--space-6);
  background: var(--color-surface);
  border-top: 1px solid var(--color-divider);
  border-bottom: 1px solid var(--color-divider);
}

.speaking__inner {
  max-width: var(--content-narrow);
  margin: 0 auto;
  text-align: center;
}

.speaking__heading {
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: var(--space-4);
  line-height: 1.2;
}

.speaking__body {
  font-family: var(--font-body);
  font-size: var(--text-base);
  color: var(--color-text-secondary);
  line-height: 1.8;
  margin-bottom: var(--space-8);
}

.speaking__topics {
  list-style: none;
  padding: 0;
  margin: 0 auto var(--space-8);
  max-width: 420px;
  text-align: left;
}

.speaking__topics li {
  font-family: var(--font-body);
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  padding: var(--space-3) 0;
  border-bottom: 1px solid var(--color-divider);
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.speaking__topics li::before {
  content: '';
  display: inline-block;
  width: 6px;
  height: 6px;
  background: var(--color-primary);
  border-radius: 50%;
  flex-shrink: 0;
}

.speaking__cta {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-8);
  background: var(--color-primary);
  color: #ffffff;
  border-radius: var(--radius-sm);
  font-family: var(--font-body);
  font-size: var(--text-sm);
  font-weight: 600;
  letter-spacing: 0.04em;
  text-decoration: none;
  transition: background var(--transition-interactive), transform var(--transition-interactive);
}

.speaking__cta:hover {
  background: var(--color-primary-hover);
  transform: translateY(-1px);
}

.speaking__cta:active {
  transform: translateY(0);
}

.speaking__note {
  display: block;
  margin-top: var(--space-4);
  font-family: var(--font-body);
  font-size: var(--text-xs);
  color: var(--color-text-muted);
}

/* ==================== EMAIL SIGNUP ==================== */
.signup {
  padding: clamp(var(--space-16), 10vw, var(--space-24)) var(--space-6);
  text-align: center;
}

.signup__inner {
  max-width: 520px;
  margin: 0 auto;
}

.signup__label {
  font-family: var(--font-body);
  font-size: var(--text-xs);
  font-weight: 500;
  letter-spacing: 0.25em;
  text-transform: uppercase;
  color: var(--color-primary);
  margin-bottom: var(--space-4);
}

.signup__heading {
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: var(--space-3);
}

.signup__desc {
  font-family: var(--font-body);
  font-size: var(--text-base);
  color: var(--color-text-secondary);
  margin-bottom: var(--space-8);
  line-height: 1.7;
}

.signup__form {
  display: flex;
  gap: var(--space-3);
  max-width: 440px;
  margin: 0 auto var(--space-4);
}

.signup__input {
  flex: 1;
  padding: var(--space-3) var(--space-4);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-surface);
  font-size: var(--text-sm);
  color: var(--color-text);
  outline: none;
}

.signup__input::placeholder {
  color: var(--color-text-muted);
}

.signup__input:focus {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px var(--color-primary-soft);
}

.signup__btn {
  padding: var(--space-3) var(--space-6);
  background: var(--color-text);
  color: var(--color-bg);
  border: none;
  border-radius: var(--radius-sm);
  font-family: var(--font-body);
  font-size: var(--text-sm);
  font-weight: 600;
  letter-spacing: 0.04em;
  cursor: pointer;
  white-space: nowrap;
  transition: background var(--transition-interactive);
}

.signup__btn:hover {
  background: var(--color-primary);
  color: #ffffff;
}

.signup__note {
  font-family: var(--font-body);
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  font-style: italic;
}

.signup__success {
  display: none;
  padding: var(--space-4) var(--space-6);
  background: var(--color-primary-soft);
  border: 1px solid rgba(37, 99, 235, 0.15);
  border-radius: var(--radius-md);
  color: var(--color-primary);
  font-family: var(--font-body);
  font-size: var(--text-sm);
  font-weight: 500;
}

/* ==================== FOOTER ==================== */
.footer {
  padding: var(--space-12) var(--space-6) var(--space-8);
  text-align: center;
  border-top: 1px solid var(--color-divider);
}

.footer__text {
  font-family: var(--font-body);
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  letter-spacing: 0.04em;
  margin-bottom: var(--space-3);
}

.footer__legal {
  display: flex;
  justify-content: center;
  gap: var(--space-4);
  margin-bottom: var(--space-6);
}

.footer__legal-link {
  font-family: var(--font-body);
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  text-decoration: none;
  cursor: pointer;
  background: none;
  border: none;
  padding: 0;
  letter-spacing: 0.04em;
  transition: color var(--transition-interactive);
}

.footer__legal-link:hover {
  color: var(--color-primary);
}

.footer__legal-sep {
  color: var(--color-divider);
  font-size: var(--text-xs);
  user-select: none;
}

.footer__crisis {
  font-family: var(--font-body);
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  line-height: 1.6;
  max-width: 580px;
  margin: 0 auto;
}

.footer__crisis a {
  color: var(--color-primary);
  text-decoration: none;
}

.footer__crisis a:hover {
  text-decoration: underline;
}

/* ==================== THEME TOGGLE ==================== */
.theme-toggle {
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: transparent;
  border: 1px solid var(--color-border);
  color: var(--color-text-secondary);
  cursor: pointer;
}

.theme-toggle:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
}

/* ==================== LEGAL MODAL ==================== */
.modal-overlay {
  position: fixed;
  inset: 0;
  z-index: 1000;
  background: oklch(from var(--color-bg) l c h / 0.85);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  display: none;
  align-items: flex-start;
  justify-content: center;
  overflow-y: auto;
  padding: var(--space-12) var(--space-6);
  opacity: 0;
  transition: opacity 0.3s ease;
}

.modal-overlay.active {
  display: flex;
  opacity: 1;
}

.modal-overlay.fade-in {
  opacity: 1;
}

.modal {
  background: var(--color-surface);
  border: 1px solid var(--color-divider);
  border-radius: var(--radius-lg);
  max-width: 720px;
  width: 100%;
  padding: var(--space-12) var(--space-8);
  box-shadow: var(--shadow-lg);
  position: relative;
  animation: modalSlideUp 0.4s cubic-bezier(0.16, 1, 0.3, 1);
}

@keyframes modalSlideUp {
  from { opacity: 0; transform: translateY(24px); }
  to   { opacity: 1; transform: translateY(0); }
}

.modal__close {
  position: absolute;
  top: var(--space-4);
  right: var(--space-4);
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  border: 1px solid var(--color-border);
  background: var(--color-surface);
  color: var(--color-text-secondary);
  cursor: pointer;
  transition: border-color var(--transition-interactive), color var(--transition-interactive);
}

.modal__close:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
}

.modal__content {
  font-family: var(--font-body);
  color: var(--color-text-secondary);
  line-height: 1.8;
}

.modal__content h1 {
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: var(--space-2);
}

.modal__content h2 {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 600;
  color: var(--color-text);
  margin-top: var(--space-8);
  margin-bottom: var(--space-3);
}

.modal__content h3 {
  font-family: var(--font-display);
  font-size: var(--text-base);
  font-weight: 600;
  color: var(--color-text);
  margin-top: var(--space-6);
  margin-bottom: var(--space-2);
}

.modal__content p {
  margin-bottom: var(--space-4);
  font-size: var(--text-sm);
}

.modal__content ul, .modal__content ol {
  margin-bottom: var(--space-4);
  padding-left: var(--space-6);
}

.modal__content li {
  margin-bottom: var(--space-2);
  font-size: var(--text-sm);
}

.modal__content strong {
  color: var(--color-text);
  font-weight: 600;
}

.modal__content hr {
  border: none;
  height: 1px;
  background: var(--color-divider);
  margin: var(--space-6) 0;
}

.modal__content a {
  color: var(--color-primary);
  text-decoration: none;
}

.modal__content a:hover {
  text-decoration: underline;
}

.modal__content blockquote {
  border-left: 2px solid var(--color-primary);
  padding-left: var(--space-4);
  margin: var(--space-6) 0;
  color: var(--color-text-muted);
  font-style: italic;
}

.modal__content table {
  width: 100%;
  border-collapse: collapse;
  margin: var(--space-4) 0;
  font-size: var(--text-sm);
}

.modal__content th,
.modal__content td {
  text-align: left;
  padding: var(--space-2) var(--space-3);
  border-bottom: 1px solid var(--color-divider);
}

.modal__content th {
  font-weight: 600;
  color: var(--color-text);
}

.modal__meta {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  margin-bottom: var(--space-6);
}

/* ==================== SCROLL ANIMATIONS ==================== */
.reveal {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.8s cubic-bezier(0.16, 1, 0.3, 1),
              transform 0.8s cubic-bezier(0.16, 1, 0.3, 1);
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* Stagger children for grid items */
.reveal-stagger > * {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.6s cubic-bezier(0.16, 1, 0.3, 1),
              transform 0.6s cubic-bezier(0.16, 1, 0.3, 1);
}

.reveal-stagger.visible > *:nth-child(1) { transition-delay: 0s; }
.reveal-stagger.visible > *:nth-child(2) { transition-delay: 0.1s; }
.reveal-stagger.visible > *:nth-child(3) { transition-delay: 0.2s; }
.reveal-stagger.visible > *:nth-child(4) { transition-delay: 0.3s; }

.reveal-stagger.visible > * {
  opacity: 1;
  transform: translateY(0);
}

/* ==================== MOBILE NAV DRAWER ==================== */
.mobile-nav {
  display: none;
  position: fixed;
  inset: 0;
  z-index: 200;
  background: oklch(from var(--color-bg) l c h / 0.96);
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--space-8);
  opacity: 0;
  transition: opacity 0.3s ease;
}

.mobile-nav.active {
  display: flex;
  opacity: 1;
}

.mobile-nav__link {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 600;
  color: var(--color-text);
  text-decoration: none;
  letter-spacing: 0.04em;
  transition: color var(--transition-interactive);
}

.mobile-nav__link:hover {
  color: var(--color-primary);
}

.mobile-nav__close {
  position: absolute;
  top: var(--space-4);
  right: var(--space-4);
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text);
  z-index: 1;
}

/* ==================== RESPONSIVE ==================== */
@media (max-width: 768px) {
  .nav {
    padding: var(--space-3) var(--space-4);
  }

  .nav__link { display: none; }

  .nav__menu-btn { display: flex; }

  .nav__actions {
    gap: var(--space-2);
  }

  .hero {
    padding: var(--space-20) var(--space-4) var(--space-12);
  }

  .hero__cover {
    max-width: 240px;
  }

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

  .author__inner {
    grid-template-columns: 1fr;
    text-align: center;
  }

  .author__text {
    text-align: left;
  }

  .author__brand-img {
    max-width: 200px;
    margin: 0 auto;
  }

  .signup__form {
    flex-direction: column;
  }

  .signup__btn {
    width: 100%;
    padding: var(--space-4) var(--space-6);
  }

  .modal {
    padding: var(--space-8) var(--space-4);
    margin: var(--space-4);
    border-radius: var(--radius-md);
  }

  .modal-overlay {
    padding: var(--space-4) var(--space-3);
  }

  .speaking__topics {
    max-width: 100%;
  }
}

@media (max-width: 480px) {
  .hero__title {
    font-size: clamp(2rem, 0.5rem + 6vw, 3rem);
  }
}