/* ============================================
   CHRIS MATTHEWS — @christheaiguy
   Dark Authority Personal Brand
   ============================================ */

/* --- 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);
  --text-3xl:  clamp(2.5rem,   1rem    + 4vw,    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;

  /* 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);
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);

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

  /* Fonts */
  --font-display: 'Cabinet Grotesk', 'Inter', sans-serif;
  --font-body: 'Satoshi', 'Inter', sans-serif;
  --font-mono: 'JetBrains Mono', 'Courier New', monospace;
}

/* --- Dark Theme (Default) --- */
:root, [data-theme="dark"] {
  --color-bg:             #0c0b09;
  --color-surface:        #13120f;
  --color-surface-2:      #1a1915;
  --color-surface-offset: #16150f;
  --color-border:         #2a2820;
  --color-divider:        #201f1a;
  --color-text:           #ede9e0;
  --color-text-muted:     #9b9588;
  --color-text-faint:     #5c5850;
  --color-primary:        #d4c5a0;
  --color-primary-hover:  #e0d4b4;
  --color-primary-active: #c4b48e;
  --color-primary-dim:    oklch(from #d4c5a0 l c h / 0.1);
  --shadow-sm: 0 1px 2px oklch(0 0 0 / 0.3);
  --shadow-md: 0 4px 12px oklch(0 0 0 / 0.4);
  --shadow-lg: 0 12px 32px oklch(0 0 0 / 0.5);
}

/* --- Light Theme --- */
[data-theme="light"] {
  --color-bg:             #faf8f5;
  --color-surface:        #ffffff;
  --color-surface-2:      #f3f0eb;
  --color-surface-offset: #eceae4;
  --color-border:         #d6d2c9;
  --color-divider:        #e6e3db;
  --color-text:           #1a1812;
  --color-text-muted:     #6b6659;
  --color-text-faint:     #a39e92;
  --color-primary:        #8a7d5a;
  --color-primary-hover:  #6e6344;
  --color-primary-active: #574f35;
  --color-primary-dim:    oklch(from #8a7d5a l c h / 0.08);
  --shadow-sm: 0 1px 2px oklch(0.2 0.02 70 / 0.06);
  --shadow-md: 0 4px 12px oklch(0.2 0.02 70 / 0.08);
  --shadow-lg: 0 12px 32px oklch(0.2 0.02 70 / 0.12);
}

@media (prefers-color-scheme: light) {
  :root:not([data-theme]) {
    --color-bg:             #faf8f5;
    --color-surface:        #ffffff;
    --color-surface-2:      #f3f0eb;
    --color-surface-offset: #eceae4;
    --color-border:         #d6d2c9;
    --color-divider:        #e6e3db;
    --color-text:           #1a1812;
    --color-text-muted:     #6b6659;
    --color-text-faint:     #a39e92;
    --color-primary:        #8a7d5a;
    --color-primary-hover:  #6e6344;
    --color-primary-active: #574f35;
    --color-primary-dim:    oklch(from #8a7d5a l c h / 0.08);
    --shadow-sm: 0 1px 2px oklch(0.2 0.02 70 / 0.06);
    --shadow-md: 0 4px 12px oklch(0.2 0.02 70 / 0.08);
    --shadow-lg: 0 12px 32px oklch(0.2 0.02 70 / 0.12);
  }
}

/* --- Global --- */
body {
  font-family: var(--font-body);
  overflow-x: hidden;
}

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

/* --- Skip Link --- */
.skip-link {
  position: absolute;
  top: -100%;
  left: var(--space-4);
  background: var(--color-text);
  color: var(--color-bg);
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-md);
  font-weight: 600;
  font-size: var(--text-sm);
  z-index: 100;
}
.skip-link:focus {
  top: var(--space-4);
}

/* --- Header / Nav --- */
.header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: oklch(from var(--color-bg) l c h / 0.85);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--color-divider);
  transition: transform 0.3s var(--ease-out), box-shadow 0.3s var(--ease-out);
}
.header--scrolled {
  box-shadow: var(--shadow-sm);
}
.header__inner {
  max-width: var(--content-wide);
  margin-inline: auto;
  padding: var(--space-3) var(--space-4);
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.header__logo {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  color: var(--color-text);
  font-family: var(--font-display);
  font-weight: 700;
  font-size: var(--text-sm);
  letter-spacing: 0.04em;
  text-transform: uppercase;
}
.header__logo svg {
  width: 32px;
  height: 32px;
}
.header__nav {
  display: flex;
  align-items: center;
  gap: var(--space-6);
}
.header__nav a {
  color: var(--color-text-muted);
  font-size: var(--text-sm);
  font-weight: 500;
  transition: color var(--transition-interactive);
}
.header__nav a:hover {
  color: var(--color-text);
}
.theme-toggle {
  color: var(--color-text-muted);
  padding: var(--space-2);
  border-radius: var(--radius-md);
  transition: color var(--transition-interactive), background var(--transition-interactive);
}
.theme-toggle:hover {
  color: var(--color-text);
  background: var(--color-surface-2);
}

/* Mobile nav */
.mobile-menu-btn {
  display: none;
  color: var(--color-text-muted);
  padding: var(--space-2);
}
@media (max-width: 767px) {
  .header__nav { display: none; }
  .header__nav.is-open {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--color-bg);
    border-bottom: 1px solid var(--color-divider);
    padding: var(--space-4);
    gap: var(--space-4);
  }
  .mobile-menu-btn { display: block; }
}

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

/* --- Hero --- */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: flex-end;
  overflow: hidden;
}
.hero__img {
  position: absolute;
  inset: 0;
  z-index: 0;
}
.hero__img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center 20%;
}
.hero__overlay {
  position: absolute;
  inset: 0;
  z-index: 1;
  background:
    linear-gradient(to top, var(--color-bg) 0%, oklch(from var(--color-bg) l c h / 0.92) 25%, oklch(from var(--color-bg) l c h / 0.6) 50%, oklch(from var(--color-bg) l c h / 0.3) 75%, transparent 100%);
}
[data-theme="light"] .hero__overlay {
  background:
    linear-gradient(to top, var(--color-bg) 0%, oklch(from var(--color-bg) l c h / 0.95) 25%, oklch(from var(--color-bg) l c h / 0.7) 50%, oklch(from var(--color-bg) l c h / 0.4) 75%, oklch(from var(--color-bg) l c h / 0.1) 100%);
}
.hero__content {
  position: relative;
  z-index: 2;
  max-width: var(--content-wide);
  margin-inline: auto;
  width: 100%;
  padding: var(--space-16) var(--space-4) clamp(var(--space-10), 6vw, var(--space-16));
}
.hero__label {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  color: #000000;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: var(--space-6);
  text-decoration: none;
  transition: opacity var(--transition-interactive);
}
.hero__label:hover {
  color: #000000;
  opacity: 0.7;
}
@keyframes pulse-dot {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.4; }
}
.hero__title {
  font-family: var(--font-display);
  font-size: var(--text-3xl);
  font-weight: 800;
  line-height: 1.05;
  color: var(--color-text);
  margin-bottom: var(--space-6);
}
.hero__title span {
  color: var(--color-primary);
}
.hero__subtitle {
  font-size: var(--text-lg);
  color: var(--color-text-muted);
  max-width: 52ch;
  margin-bottom: var(--space-8);
  line-height: 1.5;
}
.hero__actions {
  display: flex;
  gap: var(--space-3);
  flex-wrap: wrap;
}
.hero__actions .btn--ghost {
  background: oklch(from var(--color-bg) l c h / 0.6);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border-color: oklch(from var(--color-text) l c h / 0.2);
  color: var(--color-text);
}
.hero__actions .btn--ghost:hover {
  background: oklch(from var(--color-bg) l c h / 0.8);
  border-color: oklch(from var(--color-text) l c h / 0.3);
}

/* --- 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);
  transition: background var(--transition-interactive),
              color var(--transition-interactive),
              transform var(--transition-interactive),
              box-shadow var(--transition-interactive);
  cursor: pointer;
  text-decoration: none;
}
.btn:hover { transform: translateY(-1px); }
.btn:active { transform: translateY(0); }

.btn--primary {
  background: var(--color-text);
  color: var(--color-bg);
}
.btn--primary:hover {
  background: var(--color-primary);
  color: var(--color-bg);
  box-shadow: 0 4px 20px oklch(from var(--color-primary) l c h / 0.2);
}

.btn--ghost {
  background: transparent;
  color: var(--color-text-muted);
  border: 1px solid var(--color-border);
}
.btn--ghost:hover {
  color: var(--color-text);
  border-color: var(--color-text-faint);
  background: var(--color-surface);
}

/* --- Section --- */
.section {
  padding: clamp(var(--space-12), 8vw, var(--space-24)) var(--space-4);
}
.section--alt {
  background: var(--color-surface);
}
.section__label {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-primary);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: var(--space-3);
}
.section__title {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: var(--space-4);
}
.section__desc {
  color: var(--color-text-muted);
  max-width: 60ch;
  margin-bottom: var(--space-8);
}

/* --- Timeline --- */
.timeline {
  margin-top: var(--space-10);
  position: relative;
}
.timeline::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--color-border);
}
@media (max-width: 767px) {
  .timeline::before {
    display: none;
  }
}
@media (min-width: 768px) {
  .timeline::before {
    left: 100px;
  }
}
.timeline__chapter {
  position: relative;
  padding-left: var(--space-8);
  padding-bottom: var(--space-10);
}
.timeline__chapter:last-child {
  padding-bottom: 0;
}
@media (min-width: 768px) {
  .timeline__chapter {
    padding-left: calc(100px + var(--space-8));
  }
}
.timeline__marker {
  position: absolute;
  left: -5px;
  top: 0;
}
@media (min-width: 768px) {
  .timeline__marker {
    left: 0;
    width: 100px;
    text-align: right;
    padding-right: var(--space-4);
  }
}
.timeline__marker::after {
  content: '';
  position: absolute;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--color-surface);
  border: 2px solid var(--color-primary);
  top: 4px;
}
@media (max-width: 767px) {
  .timeline__marker::after {
    left: 0;
  }
}
@media (min-width: 768px) {
  .timeline__marker::after {
    right: calc(var(--space-4) * -1 - 5px);
    left: auto;
  }
}
.timeline__chapter--highlight .timeline__marker::after {
  background: var(--color-primary);
  box-shadow: 0 0 12px oklch(from var(--color-primary) l c h / 0.4);
}
.timeline__date {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-primary);
  letter-spacing: 0.04em;
}
@media (max-width: 767px) {
  .timeline__marker {
    position: relative;
    left: 0;
    margin-bottom: var(--space-2);
  }
  .timeline__marker::after {
    display: none;
  }
  .timeline__date {
    display: block;
  }
  .timeline__chapter {
    padding-left: var(--space-5);
  }
}
.timeline__body {
  max-width: 60ch;
}
.timeline__heading {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: var(--space-3);
}
.timeline__body p {
  color: var(--color-text-muted);
  margin-bottom: var(--space-3);
  line-height: 1.7;
}
.timeline__body p:last-child {
  margin-bottom: 0;
}
.timeline__body strong {
  color: var(--color-text);
  font-weight: 600;
}

/* --- Personal --- */
.personal__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-6);
  margin-top: var(--space-6);
}
@media (min-width: 768px) {
  .personal__grid {
    grid-template-columns: 1fr 1fr 1fr;
    gap: var(--space-8);
  }
}
.personal__item p {
  color: var(--color-text-muted);
  line-height: 1.7;
}

/* --- What I Do (Cards) --- */
.cards {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-6);
  max-width: var(--content-wide);
  margin-inline: auto;
}
@media (min-width: 640px) {
  .cards { grid-template-columns: 1fr 1fr; }
}
@media (min-width: 1024px) {
  .cards { grid-template-columns: 1fr 1fr 1fr; }
}
.card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  transition: transform var(--transition-interactive),
              box-shadow var(--transition-interactive),
              border-color var(--transition-interactive);
}
.card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
  border-color: var(--color-text-faint);
}
.card__icon {
  width: 40px;
  height: 40px;
  color: var(--color-primary);
  margin-bottom: var(--space-4);
}
.card__title {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: var(--space-2);
}
.card__desc {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  line-height: 1.6;
}

/* --- Speaking --- */
.speaking__formats,
.speaking__takeaways {
  margin-top: var(--space-8);
}
.speaking__heading {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: var(--space-2);
}
.speaking__note {
  font-size: var(--text-sm);
  color: var(--color-text-faint);
  font-style: italic;
  margin-bottom: var(--space-4);
}
.speaking__list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}
.speaking__list li {
  display: flex;
  gap: var(--space-3);
  color: var(--color-text-muted);
  line-height: 1.6;
}
.speaking__list li::before {
  content: '';
  flex-shrink: 0;
  margin-top: 0.6em;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--color-primary);
}
.speaking__cta {
  margin-top: var(--space-8);
}

/* --- Signal / Topics --- */
.topics {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  max-width: var(--content-default);
  margin-inline: auto;
}
.topic {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-4);
  background: var(--color-surface-2);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full);
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text-muted);
  transition: border-color var(--transition-interactive), color var(--transition-interactive);
}
.topic:hover {
  border-color: var(--color-primary);
  color: var(--color-text);
}
.topic__dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--color-primary);
}

/* --- Philosophy --- */
.philosophy {
  max-width: var(--content-narrow);
  margin-inline: auto;
}
.philosophy__quote {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 600;
  color: var(--color-text-muted);
  line-height: 1.4;
  margin-bottom: var(--space-8);
  font-style: italic;
}
.philosophy__points {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}
.philosophy__points li {
  display: flex;
  gap: var(--space-3);
  color: var(--color-text-muted);
  font-size: var(--text-base);
  line-height: 1.6;
}
.philosophy__points li::before {
  content: '';
  flex-shrink: 0;
  margin-top: 0.55em;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--color-primary);
}

/* --- Book Banner --- */
.section--book {
  background: var(--color-surface);
}
.book-banner {
  display: flex;
  align-items: center;
  gap: var(--space-10);
  max-width: var(--content-default);
  margin-inline: auto;
  background: var(--color-surface-2);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: clamp(var(--space-6), 4vw, var(--space-10));
  position: relative;
  overflow: hidden;
}
.book-banner::before {
  content: '';
  position: absolute;
  bottom: 0;
  left: clamp(var(--space-6), 4vw, var(--space-10));
  right: clamp(var(--space-6), 4vw, var(--space-10));
  height: 2px;
  background: linear-gradient(90deg, var(--color-primary), transparent);
  opacity: 0.4;
}
.book-banner__content {
  flex: 1;
}
.book-banner__title {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: var(--space-3);
}
.book-banner__desc {
  color: var(--color-text-muted);
  line-height: 1.65;
  margin-bottom: var(--space-6);
  max-width: 55ch;
}
.book-banner__buttons {
  display: flex;
  gap: var(--space-3);
  flex-wrap: wrap;
}
.book-banner__accent {
  flex-shrink: 0;
  width: 120px;
  opacity: 0.6;
}
.book-banner__accent svg {
  width: 100%;
  height: auto;
}
@media (max-width: 767px) {
  .book-banner__accent {
    display: none;
  }
}

/* --- Connect --- */
.connect {
  max-width: var(--content-narrow);
  margin-inline: auto;
  text-align: center;
}
.connect__links {
  display: flex;
  justify-content: center;
  gap: var(--space-4);
  flex-wrap: wrap;
  margin-top: var(--space-6);
}
.connect__link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-5);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  color: var(--color-text-muted);
  font-size: var(--text-sm);
  font-weight: 500;
  transition: border-color var(--transition-interactive),
              color var(--transition-interactive),
              transform var(--transition-interactive),
              box-shadow var(--transition-interactive);
  text-decoration: none;
}
.connect__link:hover {
  border-color: var(--color-primary);
  color: var(--color-text);
  transform: translateY(-1px);
  box-shadow: var(--shadow-sm);
}
.connect__link svg {
  width: 18px;
  height: 18px;
}

/* --- Footer --- */
.footer {
  border-top: 1px solid var(--color-divider);
  padding: var(--space-8) var(--space-4);
}
.footer__inner {
  max-width: var(--content-wide);
  margin-inline: auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--space-4);
}
.footer__copy {
  font-size: var(--text-xs);
  color: var(--color-text-faint);
}
.footer__credit {
  font-size: var(--text-xs);
  color: var(--color-text-faint);
}
.footer__credit a {
  color: var(--color-text-faint);
  text-decoration: underline;
  text-underline-offset: 2px;
}
.footer__credit a:hover {
  color: var(--color-text-muted);
}

/* --- Scroll Reveals --- */
.fade-in {
  opacity: 1;
}
@supports (animation-timeline: scroll()) {
  .fade-in {
    opacity: 0;
    animation: reveal-fade linear both;
    animation-timeline: view();
    animation-range: entry 0% entry 80%;
  }
}
@keyframes reveal-fade {
  to { opacity: 1; }
}

/* --- Grain texture overlay --- */
.grain {
  position: fixed;
  inset: 0;
  z-index: 999;
  pointer-events: none;
  opacity: 0.035;
}