/* ============================================
   Keith Lennox — Author Website
   styles.css
   ============================================ */

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

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  min-height: 100vh;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

img,
svg {
  display: block;
  max-width: 100%;
}

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

button {
  font: inherit;
  color: inherit;
  cursor: pointer;
  border: none;
  background: none;
}

ul,
ol {
  list-style: none;
}

/* --- Design Tokens --- */
:root {
  /* Spacing */
  --space-0: 0;
  --space-0-5: 0.25rem;
  --space-1: 0.5rem;
  --space-1-5: 0.75rem;
  --space-2: 1rem;
  --space-2-5: 1.25rem;
  --space-3: 1.5rem;
  --space-4: 2rem;
  --space-5: 2.5rem;
  --space-6: 3rem;
  --space-7: 3.5rem;
  --space-8: 4rem;
  --space-10: 5rem;
  --space-14: 7rem;

  /* Layout */
  --max-width: 105rem;
  --rounded: 0.25rem;
  --card-margin: 0.5rem;
  --card-gap: 1rem;

  /* Light mode colors */
  --background: #f9f9f9;
  --foreground-90: rgba(10, 10, 10, 0.9);
  --foreground-80: rgba(10, 10, 10, 0.8);
  --foreground-60: rgba(10, 10, 10, 0.6);
  --foreground-30: rgba(10, 10, 10, 0.3);
  --foreground-10: rgba(10, 10, 10, 0.1);
  --button-bg: #ffffff;
  --blur: rgba(10, 10, 10, 0.08);
  --error: #d71d1d;

  /* Inverted (footer) colors */
  --bg-invert: rgba(10, 10, 10, 0.9);
  --fg-90-invert: rgba(249, 249, 249, 0.9);
  --fg-60-invert: rgba(249, 249, 249, 0.6);
  --fg-30-invert: rgba(249, 249, 249, 0.3);

  /* Typography */
  --font-body: "Inter", sans-serif;
  --font-heading: "Inter", sans-serif;
  --font-logo: "Caveat", cursive;
}

/* --- Dark Mode --- */
@media (prefers-color-scheme: dark) {
  :root {
    --background: #0a0a0a;
    --foreground-90: rgba(249, 249, 249, 0.9);
    --foreground-80: rgba(249, 249, 249, 0.8);
    --foreground-60: rgba(249, 249, 249, 0.6);
    --foreground-30: rgba(249, 249, 249, 0.3);
    --foreground-10: rgba(249, 249, 249, 0.1);
    --button-bg: #1a1a1a;
    --blur: rgba(249, 249, 249, 0.08);

    --bg-invert: rgba(249, 249, 249, 0.95);
    --fg-90-invert: rgba(10, 10, 10, 0.9);
    --fg-60-invert: rgba(10, 10, 10, 0.6);
    --fg-30-invert: rgba(10, 10, 10, 0.3);
  }
}

/* --- Base Typography --- */
body {
  font-family: var(--font-body);
  font-weight: 400;
  color: var(--foreground-90);
  background-color: var(--background);
}

h1, h2, h3 {
  font-family: var(--font-heading);
  font-weight: 600;
  line-height: 0.97;
}

/* --- Skip Link --- */
.skip-link {
  position: absolute;
  top: -100%;
  left: var(--space-2);
  padding: var(--space-1) var(--space-2);
  background: var(--foreground-90);
  color: var(--background);
  border-radius: var(--rounded);
  font-size: 0.875rem;
  z-index: 100;
}

.skip-link:focus {
  top: var(--space-1);
}

/* --- Layout --- */
.page {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  overflow-x: clip;
}

.main {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.section {
  width: 100%;
  max-width: var(--max-width);
  padding-left: var(--space-1-5);
  padding-right: var(--space-1-5);
}

@media (min-width: 48rem) {
  .section {
    padding-left: var(--space-6);
    padding-right: var(--space-6);
  }
}

/* --- Grid --- */
.row {
  display: grid;
  width: 100%;
  grid-template-columns: repeat(6, 1fr);
  gap: 0 var(--card-gap);
}

@media (min-width: 48rem) {
  .row {
    grid-template-columns: repeat(12, 1fr);
  }
}

.card {
  padding: var(--card-margin);
}

/* --- Nav --- */
.nav {
  position: sticky;
  top: 0;
  z-index: 10;
  background-color: var(--background);
  border-bottom: 1px solid var(--foreground-10);
  backdrop-filter: blur(1.25rem);
  -webkit-backdrop-filter: blur(1.25rem);
  transition: transform 0.3s ease;
}

.nav--hidden {
  transform: translateY(-100%);
}

.nav-inner {
  display: flex;
  align-items: center;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-1-5);
}

@media (min-width: 48rem) {
  .nav-inner {
    padding: 0 var(--space-6);
  }
}

.nav-logo a {
  display: flex;
  align-items: center;
  min-height: 4rem;
  padding: var(--space-1-5) var(--space-1);
  font-family: var(--font-logo);
  font-size: 1.875rem;
  font-weight: 600;
  color: var(--foreground-90);
  letter-spacing: -1.2px;
}

.nav-links {
  display: none;
  margin-left: auto;
  gap: var(--space-2);
}

.nav-links a {
  display: flex;
  align-items: center;
  padding: var(--space-2-5) var(--space-1);
  font-family: var(--font-body);
  font-weight: 500;
  font-size: 1rem;
  text-transform: uppercase;
  color: var(--foreground-60);
  transition: color 0.15s ease;
}

.nav-links a:hover {
  color: var(--foreground-90);
}

.nav-links a.active {
  color: var(--foreground-90);
}

@media (min-width: 48rem) {
  .nav-links {
    display: flex;
  }
}

/* Hamburger */
.nav-hamburger {
  display: flex;
  align-items: center;
  justify-content: center;
  margin-left: auto;
  padding: var(--space-2-5) var(--space-1);
}

.nav-hamburger svg {
  width: 1.75rem;
  height: 1.75rem;
  color: var(--foreground-90);
}

.nav-hamburger svg line {
  transition: transform 0.3s ease, opacity 0.2s ease;
  transform-origin: 12px 12px;
}

.nav-hamburger[aria-expanded="true"] svg line:first-child {
  opacity: 0;
}

.nav-hamburger[aria-expanded="true"] svg line:nth-child(2) {
  transform: rotate(45deg) translateY(6px);
}

.nav-hamburger[aria-expanded="true"] svg line:last-child {
  transform: rotate(-45deg) translateY(-6px);
}

@media (min-width: 48rem) {
  .nav-hamburger {
    display: none;
  }
}

/* Mobile menu overlay */
.mobile-menu {
  display: none;
  position: fixed;
  inset: 0;
  z-index: 9;
  background-color: var(--background);
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--space-4);
}

.mobile-menu.open {
  display: flex;
}

.mobile-menu a {
  font-family: var(--font-body);
  font-weight: 500;
  font-size: 1.5rem;
  text-transform: uppercase;
  color: var(--foreground-60);
  transition: color 0.15s ease;
}

.mobile-menu a:hover {
  color: var(--foreground-90);
}

.mobile-menu a.active {
  color: var(--foreground-90);
}

/* --- Footer --- */
.footer {
  background-color: var(--bg-invert);
  width: 100%;
}

.footer-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: var(--space-7) var(--space-1-5);
}

@media (min-width: 48rem) {
  .footer-inner {
    padding: var(--space-7) var(--space-6);
  }
}

.footer-top {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--card-gap);
}

@media (min-width: 48rem) {
  .footer-top {
    grid-template-columns: 2fr 1fr;
  }
}

.footer-contact {
  padding: var(--card-margin);
}

.footer-heading {
  font-family: var(--font-heading);
  font-weight: 500;
  font-size: 1.5rem;
  line-height: 1.2;
  color: var(--fg-90-invert);
  letter-spacing: -0.24px;
}

@media (min-width: 48rem) {
  .footer-heading {
    font-size: 2.5rem;
    letter-spacing: -0.4px;
  }
}

.footer-email {
  display: block;
  line-height: 1.2;
  color: var(--fg-90-invert);
  font-family: var(--font-heading);
  font-weight: 500;
  font-size: 1.5rem;
  letter-spacing: -0.24px;
  transition: opacity 0.15s ease;
}

@media (min-width: 48rem) {
  .footer-email {
    font-size: 2.5rem;
    letter-spacing: -0.4px;
  }
}

.footer-email:hover {
  opacity: 0.7;
}

.footer-social {
  display: flex;
  align-items: flex-start;
  padding: var(--card-margin);
}

@media (min-width: 48rem) {
  .footer-social {
    align-items: flex-end;
    justify-content: flex-end;
  }
}

.footer-social-links {
  display: flex;
  align-items: center;
}

.footer-social-links a {
  display: flex;
  align-items: center;
  padding: var(--space-1);
  transition: opacity 0.15s ease;
}

.footer-social-links a:hover {
  opacity: 0.7;
}

.footer-social-links svg {
  width: 1.5rem;
  height: 1.5rem;
  color: var(--fg-90-invert);
}

.footer-divider {
  padding: var(--space-5) 0;
}

.footer-divider-line {
  height: 1px;
  background-color: var(--fg-30-invert);
}

.footer-bottom {
  display: grid;
  grid-template-columns: 1fr 1fr;
}

.footer-copyright {
  padding: var(--card-margin);
  font-weight: 500;
  font-size: 1rem;
  line-height: 1.5;
  color: var(--fg-60-invert);
}

@media (min-width: 48rem) {
  .footer-copyright {
    font-size: 1.125rem;
  }
}

.footer-back-to-top {
  padding: var(--card-margin);
  text-align: right;
  font-size: 1rem;
  line-height: 1.5;
  color: var(--fg-90-invert);
  transition: opacity 0.15s ease;
}

@media (min-width: 48rem) {
  .footer-back-to-top {
    font-size: 1.125rem;
  }
}

.footer-back-to-top:hover {
  opacity: 0.7;
}

/* --- Button --- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-1-5) var(--space-2-5);
  background-color: var(--foreground-90);
  color: var(--background);
  font-family: var(--font-body);
  font-weight: 400;
  font-size: 1rem;
  line-height: 1.5;
  border-radius: var(--rounded);
  transition: background-color 0.15s ease;
}

@media (min-width: 48rem) {
  .btn {
    font-size: 1.125rem;
  }
}

.btn:hover {
  background-color: var(--foreground-80);
}

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

/* --- Divider --- */
.divider {
  padding: var(--card-margin);
}

.divider-line {
  height: 1px;
  background-color: var(--foreground-30);
}

/* --- Hero (Home) --- */
.hero-name {
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 5rem;
  line-height: 0.97;
  letter-spacing: -3.6px;
  color: var(--foreground-90);
}

@media (min-width: 48rem) {
  .hero-name {
    font-size: 10rem;
    letter-spacing: -4.8px;
  }
}

.hero-subtitle {
  font-weight: 500;
  font-size: 1rem;
  line-height: 1.5;
  color: var(--foreground-60);
}

@media (min-width: 48rem) {
  .hero-subtitle {
    font-size: 1.125rem;
  }
}

/* --- Page Title --- */
.page-title {
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 2.125rem;
  line-height: 0.97;
  letter-spacing: -0.68px;
  color: var(--foreground-90);
}

@media (min-width: 48rem) {
  .page-title {
    font-size: 3.5rem;
    letter-spacing: -1.12px;
  }
}

/* --- Section Heading --- */
.section-heading {
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 1.25rem;
  line-height: 1.2;
  letter-spacing: -0.2px;
  color: var(--foreground-90);
}

@media (min-width: 48rem) {
  .section-heading {
    font-size: 1.375rem;
    letter-spacing: -0.22px;
  }
}

/* --- Body Text --- */
.body-text {
  font-size: 1rem;
  line-height: 1.5;
  color: var(--foreground-90);
}

@media (min-width: 48rem) {
  .body-text {
    font-size: 1.125rem;
  }
}

.body-text p + p {
  margin-top: 1rem;
}

.body-text--large {
  font-size: 1rem;
}

@media (min-width: 48rem) {
  .body-text--large {
    font-size: 1.25rem;
  }
}

/* --- Images --- */
.img-landscape {
  aspect-ratio: 1088 / 632;
  overflow: hidden;
  border-radius: var(--rounded);
}

.img-landscape img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: grayscale(1);
}

.img-portrait {
  aspect-ratio: 480 / 640;
  overflow: hidden;
  border-radius: var(--rounded);
}

.img-portrait img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: grayscale(1);
}

/* --- Book Card (Home) --- */
.book-card {
  display: flex;
  flex-direction: column;
  gap: var(--space-2-5);
  padding: var(--space-4);
  background: var(--button-bg);
  border: 1px solid var(--foreground-10);
  border-radius: 0.75rem;
  box-shadow: 0 0 3.5rem var(--blur);
  transition: box-shadow 0.15s ease;
}

.book-card:hover {
  box-shadow: 0 0 3.5rem rgba(10, 10, 10, 0.14);
}

@media (prefers-color-scheme: dark) {
  .book-card:hover {
    box-shadow: 0 0 3.5rem rgba(249, 249, 249, 0.14);
  }
}

.book-card-cover {
  aspect-ratio: 2650 / 4096;
  overflow: hidden;
  border-radius: var(--rounded);
}

.book-card-cover img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.book-card-details {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
  font-size: 1rem;
  line-height: 1.5;
  color: var(--foreground-90);
}

.book-card-details em {
  font-style: italic;
  font-weight: 500;
}

/* --- Book Page --- */
.book-cover {
  aspect-ratio: 2650 / 4096;
  border-radius: 0.5rem;
  overflow: hidden;
}

.book-cover img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.book-content {
  display: flex;
  flex-direction: column;
  gap: var(--space-6);
}

.book-section {
  display: flex;
  flex-direction: column;
  gap: var(--space-1-5);
}

@media (min-width: 48rem) {
  .book-section {
    gap: var(--space-2);
  }
}

.book-section .btn {
  width: 100%;
}

@media (min-width: 48rem) {
  .book-section .btn {
    width: auto;
  }
}

.book-quote {
  margin-bottom: var(--space-2);
}

.book-quote:last-child {
  margin-bottom: 0;
}

blockquote.book-quote {
  padding: 0;
}

.book-quote cite {
  font-style: normal;
}

.book-quote-text {
  font-style: italic;
  font-weight: 500;
  line-height: 1.5;
  font-size: 1rem;
  color: var(--foreground-90);
}

@media (min-width: 48rem) {
  .book-quote-text {
    font-size: 1.125rem;
  }
}

.book-quote-author {
  font-weight: 400;
  line-height: 1.5;
  font-size: 1rem;
  color: var(--foreground-90);
}

@media (min-width: 48rem) {
  .book-quote-author {
    font-size: 1.125rem;
  }
}

.book-detail-label {
  font-weight: 500;
}

.body-text p + p:has(.book-detail-label) {
  margin-top: 0;
}

/* --- Contact Page --- */
.contact-intro {
  font-size: 1rem;
  line-height: 1.5;
  color: var(--foreground-90);
}

@media (min-width: 48rem) {
  .contact-intro {
    font-size: 1.25rem;
  }
}

.contact-intro p + p {
  margin-top: 1rem;
}

.contact-form {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

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

.form-label {
  font-size: 1rem;
  line-height: 1.5;
  color: var(--foreground-90);
}

@media (min-width: 48rem) {
  .form-label {
    font-size: 1.125rem;
  }
}

.form-input {
  width: 100%;
  padding: var(--space-2);
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.5;
  color: var(--foreground-90);
  background-color: var(--background);
  border: 1px solid var(--foreground-60);
  border-radius: var(--rounded);
  transition: border-color 0.15s ease;
}

@media (min-width: 48rem) {
  .form-input {
    font-size: 1.125rem;
  }
}

.form-input:hover {
  border-color: var(--foreground-80);
}

.form-input:focus {
  outline: none;
  border-color: var(--foreground-80);
  box-shadow: inset 0 0 0 1px var(--foreground-80);
}

.form-textarea {
  resize: vertical;
  min-height: 7.5rem;
}

.form-submit {
  padding-top: var(--space-1);
}

/* --- 404 Page --- */
.error-section {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
}

.error-content {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
  align-items: center;
  text-align: center;
  padding: var(--space-7) 0 var(--space-14);
}

.error-code {
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 5rem;
  line-height: 0.97;
  letter-spacing: -3.6px;
  color: var(--foreground-90);
}

@media (min-width: 48rem) {
  .error-code {
    font-size: 10rem;
    letter-spacing: -4.8px;
  }
}

.error-message {
  font-size: 1rem;
  line-height: 1.5;
  color: var(--foreground-90);
}

@media (min-width: 48rem) {
  .error-message {
    font-size: 1.25rem;
  }
}

/* --- Focus Styles --- */
:focus-visible {
  outline: 2px solid var(--foreground-90);
  outline-offset: 2px;
  border-radius: 2px;
}

a:focus:not(:focus-visible),
button:focus:not(:focus-visible) {
  outline: none;
}

/* --- Home Page Layout --- */
.hero-row {
  padding-top: var(--space-10);
  padding-bottom: var(--space-8);
  row-gap: var(--space-3);
}

.hero-name-card {
  grid-column: 1 / -1;
}

.hero-subtitle-card {
  grid-column: 1 / -1;
  padding-left: var(--space-1-5);
}

.landscape-row {
  padding-bottom: var(--space-5);
}

.landscape-card {
  grid-column: 1 / -1;
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

.portrait-row {
  padding-bottom: var(--space-14);
  row-gap: var(--space-6);
}

.portrait-card {
  grid-column: 1 / -1;
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

.book-card-cell {
  grid-column: 1 / -1;
}

@media (min-width: 48rem) {
  .hero-name-card {
    grid-column: 2 / -1;
  }

  .hero-subtitle-card {
    grid-column: 2 / -1;
  }

  .landscape-card {
    grid-column: 1 / 11;
  }

  .portrait-card {
    grid-column: 7 / 13;
    grid-row: 1;
  }

  .book-card-cell {
    grid-column: 1 / 6;
    grid-row: 1;
    display: flex;
    align-items: center;
  }
}

@media (min-width: 64rem) {
  .book-card-cell {
    grid-column: 2 / 5;
  }
}

/* --- Page Header Row (Book, Contact) --- */
.page-title-row {
  padding-top: var(--space-8);
  padding-bottom: var(--space-6);
}

.page-title-row .card {
  grid-column: 1 / -1;
}

.divider-row {
  padding-bottom: var(--space-7);
}

.divider-row .divider {
  grid-column: 1 / -1;
}

/* --- Book Page Layout --- */
.book-layout {
  padding-bottom: var(--space-14);
  row-gap: var(--space-5);
}

.book-cover-cell {
  grid-column: 1 / -1;
}

.book-content-cell {
  grid-column: 1 / -1;
}

@media (min-width: 48rem) {
  .book-cover-cell {
    grid-column: 1 / 5;
    grid-row: 1;
  }

  .book-content-cell {
    grid-column: 6 / 12;
    grid-row: 1;
  }
}

/* --- Contact Page Layout --- */
.contact-layout {
  padding-bottom: var(--space-14);
  row-gap: var(--space-5);
}

.contact-intro-cell {
  grid-column: 1 / -1;
}

.contact-action-cell {
  grid-column: 1 / -1;
}

@media (min-width: 48rem) {
  .contact-intro-cell {
    grid-column: 1 / 5;
    grid-row: 1;
  }

  .contact-action-cell {
    grid-column: 6 / 12;
    grid-row: 1;
  }
}

/* --- 404 Page Layout --- */
.error-row .error-cell {
  grid-column: 1 / -1;
}

@media (min-width: 48rem) {
  .error-row .error-cell {
    grid-column: 3 / 11;
  }
}

/* --- Scroll Reveal --- */
.reveal {
  opacity: 0;
  transform: translateY(1.25rem);
  will-change: transform, opacity;
  transition: opacity 1.2s cubic-bezier(0.16, 1, 0.3, 1),
              transform 1.2s cubic-bezier(0.16, 1, 0.3, 1);
  transition-delay: var(--reveal-delay, 0s);
}

.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
  will-change: auto;
}

.footer.reveal {
  transform: none;
}

@media (prefers-reduced-motion: reduce) {
  .reveal {
    opacity: 1;
    transform: none;
    will-change: auto;
    transition: none;
  }
}