/* ========================================
   E-Paper Portfolio - Humane Interface Design
   "Modern, but familiar. Charming, but functional.
    Never cramped. Never overinflated.
    Just doing a good job with a bit of personality."
   ======================================== */

/* ========================================
   CSS Variables
   ======================================== */
:root {
  /* E-Paper colors - slightly cooler but still warm */
  --paper: #F5F2EB;
  --paper-bg: #E5E2DC;        /* Page background - cooler paper */
  --ink: #1A1A1A;
  --ink-light: #6B6B6B;
  --ink-muted: #9A9A9A;
  --accent: #B5473A;          /* Muted red - "accent" not "warning" */
  --accent-text: #F5F2EB;
  --device: #2A2A2A;
  --terminal-bg: #1A1A1A;
  --terminal-text: #E5E2DC;
  --terminal-cursor: #B5473A;

  /* Typography - Commit Mono primary */
  --font-mono: 'CommitMono', 'JetBrains Mono', 'SF Mono', monospace;
  --font-sans: 'IBM Plex Sans', system-ui, sans-serif;

  /* Spacing - generous whitespace */
  --content-max-width: 900px;
  --section-gap: 6rem;
  --content-padding: clamp(1.5rem, 4vw, 3rem);

  /* Animation */
  --transition-fast: 100ms ease;
  --transition-normal: 200ms ease;
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-sans);
  font-weight: 400;
  line-height: 1.6;
  color: var(--ink);
  background-color: var(--paper-bg);
  min-height: 100vh;
}

/* Page load animation */
body.loading .paper {
  opacity: 0;
  transform: translateY(8px);
}

.paper {
  opacity: 1;
  transform: translateY(0);
  transition: opacity var(--transition-normal), transform var(--transition-normal);
}

/* ========================================
   Layout - Separate Pages
   ======================================== */
.paper {
  background: var(--paper);
  max-width: var(--content-max-width);
  margin: 0 auto;
  padding: var(--content-padding);
  padding-top: 5rem; /* Space for sticky header */
  padding-bottom: 4rem; /* Space for sticky footer */
  min-height: 100vh;
  box-shadow: 0 0 60px rgba(0,0,0,0.08);
}

/* ========================================
   Typography
   ======================================== */
h1, h2, h3, h4, h5 {
  font-family: var(--font-mono);
  font-weight: 600;
  color: var(--ink);
  letter-spacing: -0.01em;
}

h1 {
  font-size: clamp(1.75rem, 4vw, 2.25rem);
  line-height: 1.2;
}

h2 {
  font-size: 1rem;
  font-weight: 400;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--ink-light);
  margin-bottom: 2rem;
}

h3 {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
}

h4 {
  font-size: 0.9rem;
  font-weight: 600;
}

p {
  margin-bottom: 1rem;
  color: var(--ink-light);
}

a {
  color: var(--ink);
  text-decoration: none;
  border-bottom: 1px solid var(--ink-muted);
  transition: border-color var(--transition-fast);
}

a:hover {
  border-bottom-color: var(--ink);
}

/* ========================================
   Header (Sticky, matches paper width)
   ======================================== */
.site-header {
  position: fixed;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 100%;
  max-width: var(--content-max-width);
  z-index: 100;
  background: var(--paper);
  padding: 1.5rem var(--content-padding);
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 2rem;
}

.site-title {
  font-family: var(--font-mono);
  font-size: 1rem;
  font-weight: 600;
  color: var(--ink);
  text-decoration: none;
  border: none;
}

.site-title:hover {
  border: none;
}

/* ========================================
   Numbered Navigation
   ======================================== */
.nav {
  display: flex;
  gap: 1.5rem;
  flex-wrap: wrap;
}

.nav a {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  text-decoration: none;
  color: var(--ink-light);
  border: 1px solid transparent;
  padding: 0.25rem 0.5rem;
  transition: all var(--transition-fast);
}

.nav-number {
  color: var(--ink-muted);
  margin-right: 0.25rem;
}

/* Hover: outline */
.nav a:hover {
  border-color: var(--ink);
  color: var(--ink);
}

/* Active: inverted black */
.nav a.active {
  background-color: var(--ink);
  color: var(--paper);
  border-color: var(--ink);
}

/* Button click state - tactile feedback */
.nav a:active {
  transform: scale(0.97);
  background-color: var(--ink);
  color: var(--paper);
}

/* ========================================
   Content Sections
   ======================================== */
.section {
  margin-bottom: var(--section-gap);
}

/* Section numbers as subtle markers */
.section-marker {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--ink-muted);
  letter-spacing: 0.1em;
  margin-bottom: 0.5rem;
  text-transform: uppercase;
}

/* ========================================
   Terminal Interface (About Section)
   ======================================== */
.terminal {
  font-family: var(--font-mono);
  font-size: 0.9rem;
  line-height: 1.7;
  margin-bottom: 2rem;
}

.terminal-output {
  white-space: pre-wrap;
  margin-bottom: 1.5rem;
}

.terminal-output p {
  color: var(--ink-light);
  margin-bottom: 1rem;
}

.terminal-response-time {
  display: block;
  text-align: right;
  color: var(--ink-muted);
  font-size: 0.75rem;
  margin-top: 0.5rem;
}

.terminal-input-line {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.terminal-prompt {
  color: var(--accent);
  font-weight: 600;
  user-select: none;
}

.terminal-input {
  flex: 1;
  background: transparent;
  border: none;
  color: var(--ink);
  font-family: var(--font-mono);
  font-size: 0.9rem;
  outline: none;
  caret-color: var(--accent);
}

.terminal-input::placeholder {
  color: var(--ink-muted);
}

/* Terminal conversation */
.terminal-message {
  margin-bottom: 1.5rem;
}

.terminal-message.user {
  color: var(--ink);
}

.terminal-message.user::before {
  content: '› ';
  color: var(--accent);
  font-weight: 600;
}

.terminal-message.assistant {
  color: var(--ink-light);
}

/* ========================================
   Experience Section - Company Blocks
   ======================================== */
.company-block {
  margin-bottom: 3rem;
}

.company-header {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 1.5rem;
  padding-bottom: 0.75rem;
  border-bottom: 2px solid var(--ink);
}

.company-name {
  font-family: var(--font-mono);
  font-size: 1rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin: 0;
}

.company-tenure {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--ink-light);
}

/* Roles within company */
.role {
  margin-bottom: 2rem;
  padding-bottom: 2rem;
  border-bottom: 1px solid var(--ink-muted);
}

.role:last-child {
  border-bottom: none;
  margin-bottom: 0;
  padding-bottom: 0;
}

.role-header {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 0.5rem;
}

.role-title {
  font-family: var(--font-mono);
  font-size: 0.95rem;
  font-weight: 600;
  margin: 0;
}

.role-dates {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--ink-light);
}

.role-description {
  font-size: 0.95rem;
  color: var(--ink-light);
  margin-bottom: 0.75rem;
}

/* Current label - the only red accent */
.current-label {
  display: inline-block;
  background: var(--accent);
  color: var(--accent-text);
  padding: 2px 6px;
  font-family: var(--font-mono);
  font-size: 0.65rem;
  font-weight: 500;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  margin-left: 0.5rem;
  vertical-align: middle;
}

/* Achievement list */
.achievements {
  list-style: none;
  margin: 0.75rem 0 0 0;
}

.achievements li {
  position: relative;
  padding-left: 1.25rem;
  margin-bottom: 0.35rem;
  color: var(--ink-light);
  font-size: 0.9rem;
}

.achievements li::before {
  content: '◆';
  position: absolute;
  left: 0;
  color: var(--ink-muted);
  font-size: 0.4rem;
  line-height: 1.6rem;
}

.achievements li strong {
  font-family: var(--font-mono);
  font-weight: 600;
  color: var(--ink);
}

/* ========================================
   Project Cards
   ======================================== */
.project {
  margin-bottom: 3rem;
  padding: 1.5rem;
  border: 1px solid var(--ink);
  position: relative;
}

.project:last-child {
  margin-bottom: 0;
}

/* Corner marks */
.project::before,
.project::after {
  content: '';
  position: absolute;
  width: 8px;
  height: 8px;
  border-color: var(--ink);
  border-style: solid;
}

.project::before {
  top: -1px;
  left: -1px;
  border-width: 1px 0 0 1px;
}

.project::after {
  bottom: -1px;
  right: -1px;
  border-width: 0 1px 1px 0;
}

.project-header {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 0.5rem;
}

.project-title {
  font-family: var(--font-mono);
  font-size: 1rem;
  font-weight: 600;
  margin: 0;
}

.project-meta {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--ink-light);
}

.project-description {
  color: var(--ink-light);
  font-size: 0.95rem;
  margin-bottom: 0;
}

/* Video placeholder */
.video-placeholder {
  position: relative;
  width: 100%;
  padding-top: 56.25%;
  border: 1px solid var(--ink-muted);
  background: var(--paper-bg);
  margin: 1rem 0;
}

.video-placeholder-inner {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--ink-muted);
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

.video-placeholder-inner::before {
  content: '▶';
  margin-right: 0.5rem;
}

/* Viewfinder corners */
.video-placeholder .corner-tl,
.video-placeholder .corner-tr,
.video-placeholder .corner-bl,
.video-placeholder .corner-br {
  position: absolute;
  width: 16px;
  height: 16px;
  border-color: var(--ink-muted);
  border-style: solid;
}

.video-placeholder .corner-tl { top: 8px; left: 8px; border-width: 2px 0 0 2px; }
.video-placeholder .corner-tr { top: 8px; right: 8px; border-width: 2px 2px 0 0; }
.video-placeholder .corner-bl { bottom: 8px; left: 8px; border-width: 0 0 2px 2px; }
.video-placeholder .corner-br { bottom: 8px; right: 8px; border-width: 0 2px 2px 0; }

/* Project metrics */
.project-metrics {
  display: flex;
  flex-wrap: wrap;
  gap: 1.5rem;
  margin: 1rem 0;
  padding: 0.75rem 0;
  border-top: 1px dotted var(--ink-muted);
  border-bottom: 1px dotted var(--ink-muted);
}

.metric {
  min-width: 90px;
}

.metric-value {
  font-family: var(--font-mono);
  font-size: 1rem;
  font-weight: 600;
  color: var(--ink);
  display: block;
}

.metric.highlight .metric-value {
  color: var(--accent);
}

.metric-label {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  color: var(--ink-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* Case study abstract */
.abstract {
  margin-top: 1rem;
  font-size: 0.9rem;
}

.abstract h5 {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 600;
  color: var(--ink);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin: 1.25rem 0 0.5rem 0;
}

.abstract h5:first-child {
  margin-top: 0;
}

.abstract p,
.abstract ul {
  color: var(--ink-light);
}

.abstract ul {
  list-style: none;
}

.abstract li {
  position: relative;
  padding-left: 1rem;
  margin-bottom: 0.25rem;
}

.abstract li::before {
  content: '-';
  position: absolute;
  left: 0;
  color: var(--ink-muted);
}

/* Keywords */
.keywords {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-top: 1rem;
}

.keyword {
  font-family: var(--font-mono);
  font-size: 0.6rem;
  padding: 0.2rem 0.4rem;
  border: 1px solid var(--ink-muted);
  color: var(--ink-light);
  text-transform: uppercase;
  letter-spacing: 0.02em;
}

/* ========================================
   Patent/Credentials
   ======================================== */
.credential {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  margin-top: 2rem;
  padding: 1rem;
  border-left: 3px solid var(--accent);
  background: rgba(181, 71, 58, 0.03);
}

.credential-icon {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  font-weight: 600;
  color: var(--accent);
  text-transform: uppercase;
  white-space: nowrap;
}

.credential-text {
  font-size: 0.9rem;
  color: var(--ink-light);
  margin: 0;
}

.credential-text strong {
  color: var(--ink);
  font-weight: 500;
}

.credential-number {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--ink-muted);
}

/* ========================================
   Footer (Sticky, matches paper width)
   ======================================== */
.site-footer {
  position: fixed;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 100%;
  max-width: var(--content-max-width);
  z-index: 100;
  background: var(--paper);
  padding: 0.75rem var(--content-padding);
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
}

.footer-contact {
  display: flex;
  flex-wrap: wrap;
  gap: 1.5rem;
  font-family: var(--font-mono);
  font-size: 0.8rem;
}

.footer-contact a {
  color: var(--ink);
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.footer-contact .contact-icon {
  color: var(--ink-muted);
}

.footer-availability {
  display: inline-block;
  background: var(--accent);
  color: var(--accent-text);
  padding: 4px 10px;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 500;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.footer-hint {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--ink-muted);
}

.footer-hint kbd {
  display: inline-block;
  padding: 2px 6px;
  border: 1px solid var(--ink-muted);
  border-radius: 3px;
  font-family: var(--font-mono);
  font-size: 0.65rem;
  margin: 0 2px;
}

/* ========================================
   Keyboard Shortcuts Modal
   ======================================== */
.shortcuts-modal {
  display: none;
  position: fixed;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  background: var(--paper);
  border: 1px solid var(--ink);
  padding: 2rem;
  z-index: 200;
  max-width: 400px;
  box-shadow: 0 10px 40px rgba(0,0,0,0.2);
}

.shortcuts-modal.visible {
  display: block;
}

.shortcuts-modal h3 {
  margin-bottom: 1rem;
}

.shortcuts-list {
  list-style: none;
  font-family: var(--font-mono);
  font-size: 0.85rem;
}

.shortcuts-list li {
  display: flex;
  justify-content: space-between;
  padding: 0.5rem 0;
  border-bottom: 1px dotted var(--ink-muted);
}

.shortcuts-list kbd {
  display: inline-block;
  padding: 2px 8px;
  border: 1px solid var(--ink);
  border-radius: 3px;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  background: var(--paper-bg);
}

.shortcuts-overlay {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0,0,0,0.3);
  z-index: 199;
}

.shortcuts-overlay.visible {
  display: block;
}

/* ========================================
   Loading State
   ======================================== */
.loading-indicator {
  display: none;
  text-align: center;
  padding: 3rem;
  color: var(--ink-light);
  font-family: var(--font-mono);
}

/* ========================================
   Responsive
   ======================================== */
@media (max-width: 700px) {
  :root {
    --section-gap: 4rem;
  }

  .site-header {
    flex-direction: column;
    align-items: flex-start;
    gap: 1rem;
    padding: 1rem var(--content-padding);
  }

  .nav {
    gap: 0.75rem;
  }

  .nav a {
    font-size: 0.7rem;
    padding: 0.2rem 0.4rem;
  }

  .paper {
    padding-top: 6rem;
    padding-bottom: 5rem;
  }

  .project {
    padding: 1rem;
  }

  .project::before,
  .project::after {
    display: none;
  }

  .role-header,
  .project-header,
  .company-header {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.25rem;
  }

  .site-footer {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.5rem;
  }

  .terminal {
    font-size: 0.85rem;
  }
}

@media (min-width: 1000px) {
  .paper {
    padding: 3rem;
    padding-top: 5rem;
    padding-bottom: 4rem;
  }
}

/* ========================================
   Print
   ======================================== */
@media print {
  .site-header,
  .terminal,
  .nav,
  .shortcuts-modal,
  .shortcuts-overlay,
  .footer-hint {
    display: none !important;
  }

  body {
    background: white;
  }

  .paper {
    box-shadow: none;
    padding-top: 0;
    max-width: none;
  }

  .section {
    break-inside: avoid;
  }
}

/* ========================================
   Utility
   ======================================== */
.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}