/* ==========================================================================
   Quiet Notebook — Pure CSS
   A minimal, thoughtful stylesheet for hamad.ch
   ========================================================================== */

/* 1. CSS Custom Properties (Theme Tokens)
   ========================================================================== */
:root {
  /* Colors - Light theme */
  --color-paper: #fcfcfc;
  --color-ink: #111111;
  --color-pencil: #737373;
  --color-neutral-100: #f5f5f5;
  --color-neutral-200: #e5e5e5;
  --color-neutral-300: #d4d4d4;
  --color-neutral-400: #a3a3a3;
  --color-neutral-500: #737373;
  --color-neutral-600: #525252;
  --color-neutral-700: #404040;
  --color-neutral-800: #262626;

  /* Typography */
  --font-sans:
    -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial,
    sans-serif;
  --font-serif: "Times New Roman", Times, serif;
  --font-mono:
    "SF Mono", "Segoe UI Mono", "Roboto Mono", Menlo, Courier, monospace;

  /* Layout */
  --max-width-notebook: 40rem;
  --spacing-section: 4rem;

  /* Transitions */
  --transition-colors: 0.3s ease;
  --transition-theme: 0.5s ease;
  --transition-hover: 0.5s ease-out;
}

/* Dark theme override */
html.dark {
  --color-paper: #111111;
  --color-ink: #e5e5e5;
  --color-pencil: #888888;
  --color-neutral-100: #262626;
  --color-neutral-200: #404040;
  --color-neutral-300: #525252;
  --color-neutral-400: #737373;
  --color-neutral-500: #a3a3a3;
  --color-neutral-600: #d4d4d4;
  --color-neutral-700: #e5e5e5;
  --color-neutral-800: rgba(38, 38, 38, 0.5);
}

/* 2. Base Styles
   ========================================================================== */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-sans);
  background-color: var(--color-paper);
  color: var(--color-ink);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  transition:
    background-color var(--transition-theme),
    color var(--transition-theme);
  animation: fadeIn 1.2s ease-out forwards;
}

/* Selection styling */
::selection {
  background-color: var(--color-neutral-200);
}

html.dark ::selection {
  background-color: var(--color-neutral-800);
}

/* Focus styling for accessibility */
:focus-visible {
  outline: 2px solid currentColor;
  outline-offset: 4px;
  border-radius: 1px;
}

/* 3. Layout Components
   ========================================================================== */
.layout {
  min-height: 100vh;
  padding: 4rem 1.5rem;
  display: flex;
  justify-content: center;
}

@media (min-width: 640px) {
  .layout {
    padding: 6rem 2rem;
  }
}

.container {
  max-width: var(--max-width-notebook);
  width: 100%;
}

/* Header */
.header {
  position: sticky;
  top: 0;
  background-color: var(--color-paper);
  padding: 1.5rem 0;
  margin: -1.5rem 0 2rem 0;
  z-index: 100;
  border-bottom: 1px solid transparent;
  transition: border-color var(--transition-colors);
}

.header::after {
  content: "";
  position: absolute;
  bottom: -1px;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(to bottom, var(--color-paper), transparent);
}

/* Site Title */
.site-title {
  font-size: 1.125rem;
  font-weight: 600;
  margin: 0;
  letter-spacing: -0.02em;
  white-space: nowrap;
}

.site-title a {
  color: var(--color-ink);
  text-decoration: none;
  transition: opacity var(--transition-colors);
}

.site-title a:hover {
  opacity: 0.7;
}

/* Navigation */
.nav {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  align-items: flex-start;
}

@media (min-width: 640px) {
  .nav {
    flex-direction: row;
    justify-content: space-between;
    align-items: center;
  }
}

.nav__right {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  align-items: flex-start;
}

@media (min-width: 640px) {
  .nav__right {
    flex-direction: row;
    align-items: center;
    gap: 2rem;
  }
}

.nav__links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 2rem;
  list-style: none;
}

.nav__link {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-pencil);
  text-decoration: none;
  position: relative;
  transition: color var(--transition-colors);
}

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

/* Underline expansion effect */
.nav__link::after {
  content: "";
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 100%;
  height: 1px;
  background-color: var(--color-ink);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition-colors);
}

.nav__link:hover::after {
  transform: scaleX(1);
}

/* Theme Toggle Button */
.theme-toggle {
  color: var(--color-pencil);
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.25rem;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: color var(--transition-colors);
  position: relative;
}

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

.theme-toggle__icon {
  display: block;
  width: 18px;
  height: 18px;
  transition:
    opacity 0.3s ease,
    transform 0.3s ease;
}

.theme-toggle__icon--sun {
  position: absolute;
  opacity: 0;
  transform: rotate(90deg) scale(0.8);
}

.theme-toggle__icon--moon {
  opacity: 1;
  transform: rotate(0deg) scale(1);
}

html.dark .theme-toggle__icon--sun {
  opacity: 1;
  transform: rotate(0deg) scale(1);
}

html.dark .theme-toggle__icon--moon {
  opacity: 0;
  transform: rotate(-90deg) scale(0.8);
}

/* 4. Content Components
   ========================================================================== */

/* Intro Section */
.intro {
  margin-top: 1rem;
  margin-bottom: 3rem;
}

.intro__tagline {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--color-pencil);
  margin-bottom: 1.5rem;
  letter-spacing: 0.05em;
}

.intro__text {
  font-size: 1.125rem;
  line-height: 1.75;
  color: var(--color-ink);
  max-width: 36rem;
  font-weight: 300;
  margin-bottom: 1.5rem;
}

@media (min-width: 768px) {
  .intro__text {
    font-size: 1.25rem;
  }
}

.intro__text--emphasis {
  font-weight: 500;
}

/* Section Divider */
.divider {
  width: 100%;
  height: 1px;
  background-color: var(--color-neutral-200);
  margin: 3rem 0;
}

html.dark .divider {
  background-color: var(--color-neutral-800);
}

/* Section */
.section {
  margin-bottom: var(--spacing-section);
  padding-top: 3rem;
  border-top: 1px solid var(--color-neutral-200);
}

html.dark .section {
  border-top-color: var(--color-neutral-800);
}

.section__title {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--color-ink);
  margin-bottom: 2rem;
  letter-spacing: -0.02em;
}

/* Now Section */
.now__list {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  list-style: none;
}

.now__item {
  font-size: 1rem;
  line-height: 1.75;
  color: var(--color-neutral-600);
  max-width: 42rem;
}

.now__updated {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  color: var(--color-pencil);
  opacity: 0.6;
  display: block;
  margin-top: 1rem;
}

/* Work Section */
.work__intro {
  font-size: 1.125rem;
  color: var(--color-ink);
  font-weight: 500;
  margin-bottom: 1rem;
}

.work__list {
  display: flex;
  flex-direction: column;
  gap: 2rem;
  list-style: none;
}

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

.work__item-title {
  font-size: 1rem;
  font-weight: 500;
  color: var(--color-ink);
}

.work__item-description {
  font-size: 0.875rem;
  line-height: 1.75;
  color: var(--color-neutral-600);
  max-width: 32rem;
}

/* Projects Section */
.projects__list {
  display: flex;
  flex-direction: column;
  gap: 2.5rem;
  list-style: none;
}

.project {
  display: block;
  text-decoration: none;
}

.project__header {
  display: flex;
  flex-direction: column;
  margin-bottom: 0.5rem;
}

@media (min-width: 640px) {
  .project__header {
    flex-direction: row;
    align-items: baseline;
    justify-content: space-between;
  }
}

.project__title {
  font-size: 1rem;
  font-weight: 500;
  color: var(--color-ink);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 4px;
  text-decoration-color: var(--color-neutral-300);
  transition: text-decoration-color var(--transition-colors);
}

.project:hover .project__title {
  text-decoration-color: var(--color-ink);
}

.project__meta {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-top: 0.25rem;
}

@media (min-width: 640px) {
  .project__meta {
    margin-top: 0;
  }
}

.project__category {
  font-family: var(--font-mono);
  font-size: 0.625rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-ink);
  opacity: 0.6;
}

.project__year {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--color-pencil);
}

.project__description {
  font-size: 0.875rem;
  color: var(--color-neutral-600);
  margin-bottom: 0.5rem;
  max-width: 32rem;
}

.project__tags {
  display: flex;
  gap: 0.75rem;
  list-style: none;
}

.project__tag {
  font-family: var(--font-mono);
  font-size: 0.625rem;
  color: var(--color-pencil);
  opacity: 0.6;
}

/* Writing Section */
.writing__subtitle {
  font-size: 0.875rem;
  font-style: italic;
  color: var(--color-pencil);
  margin-bottom: 0.5rem;
}

.writing__list {
  display: flex;
  flex-direction: column;
  gap: 2rem;
  list-style: none;
}

.writing__item {
  display: flex;
  flex-direction: column;
  text-decoration: none;
}

@media (min-width: 640px) {
  .writing__item {
    flex-direction: row;
    align-items: baseline;
    gap: 2rem;
  }
}

.writing__date {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--color-pencil);
  padding-top: 0.25rem;
  transition: color var(--transition-colors);
}

@media (min-width: 640px) {
  .writing__date {
    width: 8rem;
    flex-shrink: 0;
  }
}

.writing__item:hover .writing__date {
  color: var(--color-ink);
}

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

.writing__title {
  font-size: 1rem;
  font-weight: 500;
  color: var(--color-ink);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-decoration-color: transparent;
  text-underline-offset: 4px;
  transition: text-decoration-color var(--transition-colors);
}

.writing__item:hover .writing__title {
  text-decoration-color: var(--color-neutral-300);
}

html.dark .writing__item:hover .writing__title {
  text-decoration-color: var(--color-neutral-600);
}

.writing__snippet {
  font-size: 0.875rem;
  color: var(--color-neutral-500);
  max-width: 28rem;
}

/* Contact Section */
.contact__list {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  list-style: none;
}

.contact__link {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 0.875rem;
  color: var(--color-ink);
  text-decoration: none;
  transition: color var(--transition-colors);
}

.contact__link:hover {
  color: var(--color-pencil);
}

.contact__line {
  width: 1.5rem;
  height: 1px;
  background-color: var(--color-neutral-300);
  transition:
    width var(--transition-hover),
    background-color var(--transition-colors);
}

html.dark .contact__line {
  background-color: var(--color-neutral-700);
}

.contact__link:hover .contact__line {
  width: 2.5rem;
  background-color: var(--color-ink);
}

html.dark .contact__link:hover .contact__line {
  background-color: var(--color-ink);
}

/* Footer */
.footer {
  margin-top: 6rem;
  padding-top: 2rem;
  border-top: 1px solid var(--color-neutral-100);
  display: flex;
  flex-direction: column;
  gap: 1rem;
  font-family: var(--font-mono);
  font-size: 0.625rem;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  color: var(--color-neutral-400);
}

.footer__link {
  color: inherit;
  text-decoration: none;
  transition: color var(--transition-colors);
}

.footer__link:hover {
  color: var(--color-ink);
}

html.dark .footer {
  border-top-color: var(--color-neutral-800);
  color: var(--color-neutral-600);
}

@media (min-width: 640px) {
  .footer {
    flex-direction: row;
    justify-content: space-between;
    align-items: center;
  }
}

/* 5. Blog Components
   ========================================================================== */

/* Blog Index */
.blog-list {
  display: flex;
  flex-direction: column;
  gap: 2.5rem;
  list-style: none;
}

.blog-list__item {
  display: flex;
  flex-direction: column;
  text-decoration: none;
}

@media (min-width: 640px) {
  .blog-list__item {
    flex-direction: row;
    align-items: baseline;
    gap: 2rem;
  }
}

.blog-list__date {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--color-pencil);
  padding-top: 0.25rem;
  transition: color var(--transition-colors);
}

@media (min-width: 640px) {
  .blog-list__date {
    width: 8rem;
    flex-shrink: 0;
  }
}

.blog-list__item:hover .blog-list__date {
  color: var(--color-ink);
}

.blog-list__content {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.blog-list__title {
  font-size: 1rem;
  font-weight: 500;
  color: var(--color-ink);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-decoration-color: transparent;
  text-underline-offset: 4px;
  transition: text-decoration-color var(--transition-colors);
}

.blog-list__item:hover .blog-list__title {
  text-decoration-color: var(--color-neutral-300);
}

html.dark .blog-list__item:hover .blog-list__title {
  text-decoration-color: var(--color-neutral-600);
}

.blog-list__snippet {
  font-size: 0.875rem;
  color: var(--color-neutral-500);
  max-width: 28rem;
}

/* Blog Article */
.article {
  max-width: var(--max-width-notebook);
  width: 100%;
}

.article__meta {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-pencil);
  margin-bottom: 1rem;
}

.article__title {
  font-size: 2rem;
  font-weight: 500;
  letter-spacing: -0.03em;
  line-height: 1.15;
  color: var(--color-ink);
  margin-bottom: 3rem;
}

@media (min-width: 640px) {
  .article__title {
    font-size: 2.25rem;
  }
}

.article h2 {
  font-size: 1.3rem;
  font-weight: 600;
  color: var(--color-ink);
  margin: 3rem 0 1rem 0;
  letter-spacing: -0.01em;
}

.article p {
  font-size: 1.0625rem;
  line-height: 1.8;
  color: var(--color-ink);
  margin-bottom: 1.5rem;
  font-weight: 300;
}

.article strong {
  font-weight: 600;
  color: var(--color-ink);
}

.article em {
  font-style: italic;
}

.article code {
  font-family: var(--font-mono);
  font-size: 0.9em;
  background: var(--color-neutral-100);
  padding: 0.2em 0.4em;
  border-radius: 3px;
}

.article pre {
  background: var(--color-neutral-100);
  padding: 1.5rem;
  border-radius: 6px;
  overflow-x: auto;
  margin: 2rem 0;
  border: 1px solid var(--color-neutral-200);
}

html.dark .article pre {
  border-color: var(--color-neutral-300);
}

.article pre code {
  background: none;
  padding: 0;
  font-size: 0.85em;
  line-height: 1.5;
  color: var(--color-ink);
}

.article blockquote {
  border-left: 3px solid var(--color-ink);
  padding-left: 1.5rem;
  margin: 2rem 0;
  font-style: italic;
  color: var(--color-pencil);
}

.article__back {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-pencil);
  text-decoration: none;
  margin-top: 4rem;
  transition: color var(--transition-colors);
}

.article__back:hover {
  color: var(--color-ink);
}

/* 6. Terminal Overlay
   ========================================================================== */

.terminal-toggle {
  color: var(--color-pencil);
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.25rem;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: color var(--transition-colors);
}

.terminal-toggle:hover {
  color: var(--color-ink);
}

.terminal {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  z-index: 1000;
  background-color: #0a0a0a;
  color: #e0e0e0;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  line-height: 1.7;
  display: flex;
  flex-direction: column;
  opacity: 0;
  visibility: hidden;
  transform: translateY(1rem);
  transition:
    opacity 0.25s ease,
    transform 0.25s ease,
    visibility 0.25s;
}

.terminal.terminal--open {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.terminal__chrome {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.75rem 1.25rem;
  background-color: rgba(255, 255, 255, 0.04);
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
  flex-shrink: 0;
}

.terminal__title {
  font-size: 0.6875rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: rgba(255, 255, 255, 0.35);
}

.terminal__close {
  background: none;
  border: none;
  color: rgba(255, 255, 255, 0.35);
  font-size: 1.25rem;
  cursor: pointer;
  padding: 0 0.25rem;
  line-height: 1;
  transition: color 0.2s;
}

.terminal__close:hover {
  color: #fff;
}

.terminal__body {
  flex: 1;
  overflow-y: auto;
  padding: 1.25rem;
  white-space: pre-wrap;
  word-break: break-word;
  scrollbar-width: thin;
  scrollbar-color: rgba(255, 255, 255, 0.1) transparent;
}

.terminal__body::-webkit-scrollbar {
  width: 4px;
}

.terminal__body::-webkit-scrollbar-thumb {
  background: rgba(255, 255, 255, 0.1);
  border-radius: 2px;
}

.terminal__input-line {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 1.25rem;
  border-top: 1px solid rgba(255, 255, 255, 0.06);
  background-color: rgba(255, 255, 255, 0.02);
  flex-shrink: 0;
}

.terminal__prompt {
  color: #7ec699;
  white-space: nowrap;
  font-size: 0.8125rem;
}

.terminal__input {
  flex: 1;
  background: none;
  border: none;
  color: #e0e0e0;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  outline: none;
  caret-color: #7ec699;
}

.terminal__input::placeholder {
  color: rgba(255, 255, 255, 0.15);
}

.terminal__entry {
  margin-bottom: 0.75rem;
}

.terminal__entry-prompt {
  color: #7ec699;
}

.terminal__entry-cmd {
  color: #fff;
}

.terminal__entry-output {
  color: #b0b0b0;
}

.terminal__entry-output--highlight {
  color: #e0c46c;
}

.terminal__entry-output--accent {
  color: #7ec699;
}

.terminal__entry-output--dim {
  color: #666;
}

.terminal__entry-output--error {
  color: #e06c75;
}

.terminal__entry-output a {
  color: #61afef;
  text-decoration: underline;
  text-decoration-color: rgba(97, 175, 239, 0.3);
  text-underline-offset: 2px;
}

.terminal__entry-output a:hover {
  text-decoration-color: #61afef;
}

@media (max-width: 639px) {
  .terminal {
    font-size: 0.75rem;
  }

  .terminal__prompt {
    font-size: 0.75rem;
  }

  .terminal__input {
    font-size: 0.75rem;
  }

  .terminal__body {
    padding: 1rem;
  }
}

/* 7. Utilities & Animations
   ========================================================================== */

/* Fade in animation */
@keyframes fadeIn {
  0% {
    opacity: 0;
    transform: translateY(8px);
  }
  100% {
    opacity: 1;
    transform: translateY(0);
  }
}