/* ============================================================
   Portfolio — Design System & Styles
   Typography-first, minimal, editorial design
   ============================================================ */

/* --- Google Fonts --- */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&family=Playfair+Display:wght@400;500;600;700&family=JetBrains+Mono:wght@400;500;700&display=swap');

/* --- Design Tokens --- */
:root {
  /* Typography */
  --font-display: 'Playfair Display', Georgia, serif;
  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'JetBrains Mono', 'SF Mono', monospace;

  --text-xs: 0.75rem;
  --text-sm: 0.875rem;
  --text-base: 1rem;
  --text-lg: 1.125rem;
  --text-xl: 1.5rem;
  --text-2xl: 2rem;
  --text-3xl: 3rem;
  --text-4xl: 3.75rem;

  --leading-tight: 1.2;
  --leading-normal: 1.6;
  --leading-relaxed: 1.8;

  /* Colors — Light mode */
  --color-primary: #1A1A1A;
  --color-secondary: #6B6B6B;
  --color-accent: #0066CC;
  --color-accent-hover: #0052A3;
  --color-bg: #FFFFFF;
  --color-bg-alt: #FAFAFA;
  --color-muted: #F5F5F5;
  --color-border: #E5E5E5;
  --color-success: #16a34a;

  /* Spacing */
  --space-xs: 0.5rem;
  --space-sm: 1rem;
  --space-md: 2rem;
  --space-lg: 4rem;
  --space-xl: 6rem;
  --space-2xl: 8rem;

  /* Layout */
  --content-width: 720px;
  --layout-width: 1080px;
  --nav-height: 64px;

  /* Misc */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.06);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.08);
  --shadow-lg: 0 8px 30px rgba(0,0,0,0.1);
  --transition: 0.2s ease;
  --color-nav-bg: rgba(255,255,255,0.92);
}

/* --- Dark Mode --- */
@media (prefers-color-scheme: dark) {
  :root {
    --color-primary: #F0F0F0;
    --color-secondary: #A0A0A0;
    --color-accent: #4D9FFF;
    --color-accent-hover: #6BB3FF;
    --color-bg: #111111;
    --color-bg-alt: #1A1A1A;
    --color-muted: #222222;
    --color-border: #333333;
    --color-nav-bg: rgba(17,17,17,0.92);
  }
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-body);
  font-size: var(--text-base);
  line-height: var(--leading-normal);
  color: var(--color-primary);
  background: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

img { max-width: 100%; height: auto; display: block; }
a { color: var(--color-accent); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--color-accent-hover); }

::selection {
  background: var(--color-accent);
  color: #fff;
}

/* --- Layout Containers --- */
.container {
  max-width: var(--layout-width);
  margin: 0 auto;
  padding: 0 var(--space-md);
}

.container--narrow {
  max-width: var(--content-width);
  margin: 0 auto;
  padding: 0 var(--space-md);
}

/* --- Navigation --- */
.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--color-nav-bg);
  border-bottom: 1px solid var(--color-border);
  backdrop-filter: blur(10px);
}

.nav__inner {
  max-width: var(--layout-width);
  margin: 0 auto;
  padding: 0 var(--space-md);
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--nav-height);
}

.nav__brand {
  display: flex;
  align-items: center;
  gap: 14px;
}

.nav__logo {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 600;
  color: var(--color-primary);
  text-decoration: none;
}
.nav__logo:hover { color: var(--color-primary); }

.nav__links {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  list-style: none;
}

.nav__link {
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-secondary);
  text-decoration: none;
  transition: color var(--transition);
  position: relative;
}
.nav__link:hover,
.nav__link--active {
  color: var(--color-primary);
}
.nav__link--active::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--color-accent);
  border-radius: 1px;
}

.nav__theme-toggle {
  background: none;
  border: none;
  cursor: pointer;
  font-size: var(--text-base);
  color: var(--color-secondary);
  padding: var(--space-xs);
  border-radius: var(--radius-sm);
  transition: color var(--transition);
}
.nav__theme-toggle:hover { color: var(--color-primary); }

/* --- DM button (nav) --- */
.nav__dm-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4em;
  font-size: var(--text-sm);
  font-weight: 600;
  padding: 0.5em 1.1em;
  border-radius: 100px;
  background: var(--color-accent);
  color: #fff;
  text-decoration: none;
  transition: all var(--transition);
}
.nav__dm-btn:hover {
  background: var(--color-accent-hover);
  color: #fff;
  transform: translateY(-1px);
}
.nav__dm-btn svg { width: 14px; height: 14px; }

/* --- Human / Agent view toggle (lives beside the logo) --- */
.nav__modes {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding-left: 14px;
  border-left: 1px solid var(--color-border);
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  line-height: 1;
}
.nav__mode {
  border: 0;
  background: transparent;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 5px;
  font: inherit;
  color: var(--color-secondary);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  text-decoration: none;
  transition: color 0.15s;
}
.nav__mode::before { content: "[ ]"; }
.nav__mode:hover { color: var(--color-primary); }
.nav__mode.is-active { color: var(--color-accent); }
.nav__mode.is-active::before { content: "[x]"; }

@media (max-width: 480px) {
  .nav__modes { gap: 6px; padding-left: 8px; }
  .nav__mode { font-size: 10px; }
}

/* --- Agent (machine) view overlay --- */
.agent-view {
  position: fixed;
  inset: 0;
  z-index: 300;
  background: #0c0c0d;
  overflow: auto;
  display: none;
}
body.agent-on .agent-view { display: block; }
body.agent-on { overflow: hidden; }

.agent-view__inner {
  max-width: 760px;
  margin: 0 auto;
  padding: calc(var(--nav-height) + 40px) var(--space-md) 100px;
}

.agent-view__copy,
.agent-view__human-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  width: 100%;
  padding: 15px 22px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: #e8e8ea;
  background: transparent;
  border: 1px solid rgba(255,255,255,0.25);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all 0.18s;
}
.agent-view__copy { margin: 0 0 var(--space-sm); }
.agent-view__human-btn { margin: 0 0 var(--space-md); }
.agent-view__copy:hover,
.agent-view__human-btn:hover { background: rgba(255,255,255,0.08); border-color: rgba(255,255,255,0.5); color: #fff; }
.agent-view__copy.is-copied { color: #4ade80; border-color: #4ade80; }
.agent-view__human-btn svg { width: 14px; height: 14px; }

.agent-view__pre {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.7;
  color: #e4e4e6;
  white-space: pre-wrap;
  word-break: break-word;
}

/* Mobile nav toggle */
.nav__mobile-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--space-xs);
  color: var(--color-primary);
}
.nav__mobile-toggle svg { width: 24px; height: 24px; }

@media (max-width: 640px) {
  .nav__mobile-toggle { display: block; }
  .nav__links {
    display: none;
    position: absolute;
    top: var(--nav-height);
    left: 0;
    right: 0;
    background: var(--color-bg);
    border-bottom: 1px solid var(--color-border);
    flex-direction: column;
    padding: var(--space-sm) var(--space-md);
    gap: var(--space-sm);
  }
  .nav__links--open { display: flex; }
  .nav__link { padding: var(--space-xs) 0; }
  .nav__dm-btn { align-self: flex-start; }
}

/* --- Hero Section --- */
.hero {
  padding: var(--space-2xl) 0;
  text-align: center;
}

.hero__name {
  font-family: var(--font-display);
  font-size: var(--text-4xl);
  font-weight: 700;
  line-height: var(--leading-tight);
  margin-bottom: var(--space-xs);
}

.hero__title {
  font-size: var(--text-xl);
  color: var(--color-secondary);
  font-weight: 400;
  margin-bottom: var(--space-md);
}

.hero__bio {
  font-size: var(--text-lg);
  color: var(--color-secondary);
  max-width: 560px;
  margin: 0 auto var(--space-md);
  line-height: var(--leading-relaxed);
}

.hero__cta {
  display: flex;
  gap: var(--space-sm);
  justify-content: center;
  flex-wrap: wrap;
}

/* --- Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5em;
  padding: 0.75em 1.5em;
  font-family: var(--font-body);
  font-size: var(--text-sm);
  font-weight: 500;
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
  background: var(--color-bg);
  color: var(--color-primary);
  cursor: pointer;
  transition: all var(--transition);
  text-decoration: none;
}
.btn:hover {
  background: var(--color-muted);
  color: var(--color-primary);
  border-color: var(--color-secondary);
}

.btn--primary {
  background: var(--color-primary);
  color: var(--color-bg);
  border-color: var(--color-primary);
}
.btn--primary:hover {
  opacity: 0.85;
  color: var(--color-bg);
}

/* --- Section --- */
.section {
  padding: var(--space-xl) 0;
  scroll-margin-top: var(--nav-height);
}
.section--alt {
  background: var(--color-bg-alt);
}

/* Editorial divider between sections, inspired by asterisk section breaks */
.section__divider {
  text-align: center;
  color: var(--color-border);
  font-size: var(--text-lg);
  letter-spacing: 0.5em;
  padding: var(--space-md) 0 0;
}

.section__header {
  margin-bottom: var(--space-lg);
}

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

.section__subtitle {
  font-size: var(--text-lg);
  color: var(--color-secondary);
}

.section__link {
  display: inline-flex;
  align-items: center;
  gap: 0.35em;
  font-size: var(--text-sm);
  font-weight: 500;
  margin-top: var(--space-md);
}

/* --- Project Cards --- */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-md);
}

.project-card {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-md);
  transition: all var(--transition);
  background: var(--color-bg);
  display: flex;
  flex-direction: column;
  overflow: hidden;
}
.project-card:hover {
  box-shadow: var(--shadow-md);
  border-color: var(--color-secondary);
  transform: translateY(-2px);
}

.project-card__image {
  display: block;
  width: calc(100% + 2 * var(--space-md));
  margin: calc(-1 * var(--space-md)) calc(-1 * var(--space-md)) var(--space-sm);
  aspect-ratio: 16 / 10;
  object-fit: cover;
  object-position: top;
  border-radius: var(--radius-lg) var(--radius-lg) 0 0;
  border-bottom: 1px solid var(--color-border);
}

.project-card__title {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 600;
  margin-bottom: 0.25em;
}

.project-card__tagline {
  font-size: var(--text-sm);
  color: var(--color-secondary);
  margin-bottom: var(--space-sm);
}

.project-card__meta {
  font-size: var(--text-xs);
  color: var(--color-secondary);
  margin-bottom: var(--space-sm);
}

.project-card__insight {
  font-size: var(--text-sm);
  font-style: italic;
  color: var(--color-secondary);
  border-left: 2px solid var(--color-border);
  padding-left: var(--space-sm);
  margin-bottom: var(--space-sm);
}

.project-card__persona {
  font-size: var(--text-xs);
  color: var(--color-secondary);
  margin-bottom: var(--space-sm);
}

.project-card__persona strong {
  color: var(--color-primary);
  font-weight: 600;
}

.project-card__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5em;
  margin-bottom: var(--space-sm);
}

.tag {
  font-size: var(--text-xs);
  padding: 0.25em 0.75em;
  background: var(--color-muted);
  color: var(--color-secondary);
  border-radius: 100px;
  font-weight: 500;
}

.project-card__actions {
  margin-top: auto;
  padding-top: var(--space-sm);
  display: flex;
  gap: var(--space-sm);
}

/* --- Project Detail (expanded) --- */
.project-detail {
  display: none;
  margin-top: var(--space-sm);
  padding-top: var(--space-sm);
  border-top: 1px solid var(--color-border);
}
.project-detail--open { display: block; }

.project-detail__section {
  margin-bottom: var(--space-sm);
}

.project-detail__label {
  font-size: var(--text-xs);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-secondary);
  margin-bottom: 0.25em;
}

.project-detail__text {
  font-size: var(--text-sm);
  line-height: var(--leading-normal);
}

.project-detail__list {
  list-style: none;
  padding: 0;
}
.project-detail__list li {
  font-size: var(--text-sm);
  padding: 0.25em 0;
  padding-left: 1em;
  position: relative;
}
.project-detail__list li::before {
  content: '\2192';
  position: absolute;
  left: 0;
  color: var(--color-accent);
}

/* --- Blog Post Cards --- */
.posts-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.post-card {
  padding-bottom: var(--space-md);
  border-bottom: 1px solid var(--color-border);
  transition: opacity var(--transition);
}
.post-card:last-child { border-bottom: none; }
.post-card:hover { opacity: 0.8; }

.post-card__link {
  text-decoration: none;
  color: inherit;
  display: block;
}

.post-card__date {
  font-size: var(--text-xs);
  color: var(--color-secondary);
  margin-bottom: 0.35em;
}

.post-card__title {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 600;
  margin-bottom: 0.35em;
  line-height: var(--leading-tight);
}

.post-card__excerpt {
  font-size: var(--text-base);
  color: var(--color-secondary);
  line-height: var(--leading-normal);
  margin-bottom: 0.5em;
}

.post-card__meta {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-size: var(--text-xs);
  color: var(--color-secondary);
}

.post-card__reading-time::before {
  content: '\00B7';
  margin-right: var(--space-sm);
}

/* --- Timeline (used by the /signin admin editor's preview pane) --- */
.timeline {
  position: relative;
  padding-left: var(--space-md);
}
.timeline::before {
  content: '';
  position: absolute;
  left: 0;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: var(--color-border);
}

.timeline__item {
  position: relative;
  padding-bottom: var(--space-lg);
}
.timeline__item:last-child { padding-bottom: 0; }

.timeline__dot {
  position: absolute;
  left: calc(-1 * var(--space-md) - 5px);
  top: 6px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--color-accent);
  border: 2px solid var(--color-bg);
}

.timeline__date {
  font-size: var(--text-xs);
  color: var(--color-secondary);
  font-weight: 500;
  margin-bottom: 0.25em;
}

.timeline__role {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 600;
  margin-bottom: 0.1em;
}

.timeline__company {
  font-size: var(--text-base);
  color: var(--color-accent);
  margin-bottom: 0.5em;
}

.timeline__description {
  font-size: var(--text-sm);
  color: var(--color-secondary);
  margin-bottom: 0.5em;
}

.timeline__achievements {
  list-style: none;
  padding: 0;
}
.timeline__achievements li {
  font-size: var(--text-sm);
  padding: 0.2em 0 0.2em 1.25em;
  position: relative;
}
.timeline__achievements li::before {
  content: '\2014';
  position: absolute;
  left: 0;
  color: var(--color-border);
}

/* --- Career Flow (public Experience section) --- */
.career-flow {
  display: flex;
  flex-wrap: nowrap;
  align-items: center;
  gap: var(--space-md);
}

.career-flow__item {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 0.35em;
  min-width: 0;
}

.career-flow__name {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 600;
}

.career-flow__subtitle {
  font-size: var(--text-sm);
  color: var(--color-secondary);
}

.career-flow__dates {
  font-size: var(--text-xs);
  color: var(--color-secondary);
}

.career-flow__arrow {
  align-self: center;
  color: var(--color-secondary);
  font-size: var(--text-lg);
  flex-shrink: 0;
}

/* Small screens: allow wrapping rather than overflowing/shrinking text */
@media (max-width: 640px) {
  .career-flow {
    flex-wrap: wrap;
  }
}

/* --- Skills Grid --- */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: var(--space-md);
}

.skills-group__title {
  font-size: var(--text-sm);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-secondary);
  margin-bottom: var(--space-sm);
}

.skills-group__list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5em;
}

/* --- About Page --- */
.about__bio {
  font-size: var(--text-lg);
  line-height: var(--leading-relaxed);
  color: var(--color-primary);
}
.about__bio p { margin-bottom: var(--space-sm); }

.currently-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: var(--space-md);
}

.currently-item__label {
  font-size: var(--text-xs);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-secondary);
  margin-bottom: 0.35em;
}
.currently-item__value {
  font-size: var(--text-base);
}

/* --- Contact --- */
.contact-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: var(--space-md);
}

.contact-card {
  padding: var(--space-md);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  text-align: center;
}
.contact-card__icon {
  font-size: var(--text-2xl);
  margin-bottom: var(--space-xs);
}
.contact-card__label {
  font-size: var(--text-sm);
  color: var(--color-secondary);
  margin-bottom: 0.25em;
}
.contact-card__value {
  font-weight: 500;
}

/* --- Footer --- */
.footer {
  border-top: 1px solid var(--color-border);
  padding: var(--space-lg) 0;
  text-align: center;
}

.footer__social {
  display: flex;
  justify-content: center;
  gap: var(--space-md);
  margin-bottom: var(--space-sm);
}

.footer__social-link {
  color: var(--color-secondary);
  transition: color var(--transition);
}
.footer__social-link:hover { color: var(--color-primary); }
.footer__social-link svg { width: 20px; height: 20px; }

.footer__text {
  font-size: var(--text-sm);
  color: var(--color-secondary);
}

/* --- Page Header --- */
.page-header {
  padding: var(--space-xl) 0 var(--space-lg);
}
.page-header__title {
  font-family: var(--font-display);
  font-size: var(--text-3xl);
  font-weight: 700;
  margin-bottom: var(--space-xs);
}
.page-header__subtitle {
  font-size: var(--text-lg);
  color: var(--color-secondary);
  max-width: 560px;
}

/* --- Filter Tabs --- */
.filter-tabs {
  display: flex;
  gap: var(--space-xs);
  margin-bottom: var(--space-md);
  flex-wrap: wrap;
}
.filter-tab {
  font-size: var(--text-sm);
  font-weight: 500;
  padding: 0.4em 1em;
  border-radius: 100px;
  border: 1px solid var(--color-border);
  background: var(--color-bg);
  color: var(--color-secondary);
  cursor: pointer;
  transition: all var(--transition);
}
.filter-tab:hover,
.filter-tab--active {
  background: var(--color-primary);
  color: var(--color-bg);
  border-color: var(--color-primary);
}

/* --- Animations --- */
.fade-in {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.5s ease, transform 0.5s ease;
}
.fade-in--visible {
  opacity: 1;
  transform: translateY(0);
}

/* Staggered children */
.stagger > * { opacity: 0; transform: translateY(12px); }
.stagger--visible > *:nth-child(1) { transition-delay: 0s; }
.stagger--visible > *:nth-child(2) { transition-delay: 0.05s; }
.stagger--visible > *:nth-child(3) { transition-delay: 0.1s; }
.stagger--visible > *:nth-child(4) { transition-delay: 0.15s; }
.stagger--visible > *:nth-child(5) { transition-delay: 0.2s; }
.stagger--visible > *:nth-child(6) { transition-delay: 0.25s; }
.stagger--visible > * {
  opacity: 1;
  transform: translateY(0);
  transition: opacity 0.4s ease, transform 0.4s ease;
}

/* --- Utility --- */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0,0,0,0);
  border: 0;
}

.text-secondary { color: var(--color-secondary); }
.mt-sm { margin-top: var(--space-sm); }
.mt-md { margin-top: var(--space-md); }
.mt-lg { margin-top: var(--space-lg); }
.mb-sm { margin-bottom: var(--space-sm); }
.mb-md { margin-bottom: var(--space-md); }
.mb-lg { margin-bottom: var(--space-lg); }

/* --- Print Styles --- */
@media print {
  .nav, .footer, .btn, .filter-tabs, .project-card__actions { display: none !important; }
  body { font-size: 11pt; color: #000; background: #fff; }
  .hero { padding: 1rem 0; }
  .section { padding: 1rem 0; }
  a { color: #000; text-decoration: underline; }
  .project-card { break-inside: avoid; box-shadow: none; border: 1px solid #ccc; }
}

/* --- Responsive --- */
@media (max-width: 768px) {
  :root {
    --text-3xl: 2.25rem;
    --text-4xl: 2.75rem;
  }
  .hero { padding: var(--space-xl) 0; }
  .section { padding: var(--space-lg) 0; }
  .page-header { padding: var(--space-lg) 0 var(--space-md); }
  .projects-grid { grid-template-columns: 1fr; }
  .skills-grid { grid-template-columns: 1fr; }
  .contact-grid { grid-template-columns: 1fr; }
}

@media (max-width: 480px) {
  :root {
    --text-3xl: 1.875rem;
    --text-4xl: 2.25rem;
    --space-md: 1.5rem;
  }
}