/* ==========================================================================
   Rahidul Islam — Portfolio Design System
   Modern, Bespoke Developer Portfolio for Python & Django Engineer
   Zero third-party framework dependencies · Pure semantic CSS
   ========================================================================== */

/* --------------------------------------------------------------------------
   CSS Variables & Design Tokens (Base Layout & Typography)
   -------------------------------------------------------------------------- */
:root {
  /* Typography */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  --font-mono: 'JetBrains Mono', ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  --font-serif: Georgia, 'Times New Roman', serif;

  /* Spacing */
  --space-xs: 4px;
  --space-sm: 8px;
  --space-md: 16px;
  --space-lg: 24px;
  --space-xl: 32px;
  --space-2xl: 48px;
  --space-3xl: 64px;
  --space-4xl: 96px;

  /* Border Radii */
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-full: 9999px;

  /* Transitions */
  --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-base: 250ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 350ms cubic-bezier(0.4, 0, 0.2, 1);

  /* Elevation Shadows (Default Light) */
  --shadow-sm: 0 1px 3px rgba(15, 23, 42, 0.06), 0 1px 2px rgba(15, 23, 42, 0.04);
  --shadow-md: 0 4px 12px rgba(15, 23, 42, 0.07), 0 2px 4px rgba(15, 23, 42, 0.04);
  --shadow-lg: 0 12px 28px rgba(15, 23, 42, 0.08), 0 4px 8px rgba(15, 23, 42, 0.04);
  --shadow-card-hover: 0 18px 36px -8px rgba(15, 23, 42, 0.12), 0 8px 16px -4px rgba(15, 23, 42, 0.06);

  /* Light Theme Tokens */
  --paper: #f8fafc;
  --surface: #ffffff;
  --surface-alt: #f1f5f9;
  --surface-highlight: #e2e8f0;
  --ink: #0f172a;
  --ink-secondary: #334155;
  --muted: #64748b;
  --muted-light: #94a3b8;
  --line: #e2e8f0;
  --line-strong: #cbd5e1;
  --green: #0d9488;
  --green-hover: #0f766e;
  --green-light: #f0fdfa;
  --green-border: #99f6e4;
  --clay: #0d9488;
  --accent-glow: rgba(13, 148, 136, 0.15);
  --status-live: #10b981;
  --status-glow: rgba(16, 185, 129, 0.25);
  --header-bg: rgba(248, 250, 252, 0.88);
}

/* --------------------------------------------------------------------------
   Reset & Global Styles
   -------------------------------------------------------------------------- */
*,
*::before,
*::after {
  box-sizing: border-box;
}

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

body {
  margin: 0;
  background-color: var(--paper);
  color: var(--ink);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.7;
  letter-spacing: -0.01em;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  transition: background-color var(--transition-base), color var(--transition-base);
}

::selection {
  background-color: var(--green);
  color: #ffffff;
}

a {
  color: inherit;
  text-decoration: none;
  transition: color var(--transition-fast), border-color var(--transition-fast);
}

img,
video {
  display: block;
  max-width: 100%;
  height: auto;
}

button,
input,
textarea,
select {
  font: inherit;
  color: inherit;
}

button,
a,
input,
textarea {
  -webkit-tap-highlight-color: transparent;
}

button {
  cursor: pointer;
  background: none;
  border: none;
}

button:disabled {
  cursor: not-allowed;
  opacity: 0.6;
}

[hidden] {
  display: none !important;
}

/* --------------------------------------------------------------------------
   Typography
   -------------------------------------------------------------------------- */
h1, h2, h3, h4, h5, h6, p {
  margin: 0;
}

h1, h2, h3, h4 {
  color: var(--ink);
  font-weight: 600;
  letter-spacing: -0.035em;
  line-height: 1.15;
}

h1 {
  font-size: clamp(38px, 5.2vw, 64px);
  font-weight: 700;
}

h2 {
  font-size: clamp(28px, 3.8vw, 42px);
}

h3 {
  font-size: clamp(20px, 2.4vw, 26px);
  letter-spacing: -0.025em;
}

p {
  color: var(--muted);
}

em {
  font-family: inherit;
  font-style: italic;
  color: var(--green);
}

.mono {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.05em;
}

.eyebrow {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--green);
  margin-bottom: 16px;
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

/* --------------------------------------------------------------------------
   Accessibility & Layout Containers
   -------------------------------------------------------------------------- */
:focus-visible {
  outline: 2px solid var(--green);
  outline-offset: 3px;
}

.skip-link {
  position: fixed;
  z-index: 1000;
  left: 24px;
  top: -100px;
  background: var(--ink);
  color: #ffffff;
  padding: 12px 20px;
  font-weight: 600;
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-lg);
  transition: top var(--transition-fast);
}

.skip-link:focus {
  top: 16px;
}

.container {
  width: min(1200px, calc(100% - 64px));
  margin-inline: auto;
}

.section {
  padding-block: var(--space-4xl);
  scroll-margin-top: 24px;
}

.section-heading {
  display: flex;
  justify-content: space-between;
  gap: 48px;
  align-items: flex-end;
  margin-bottom: var(--space-2xl);
}

.section-heading > p {
  font-size: 15px;
  max-width: 420px;
  line-height: 1.7;
}

/* --------------------------------------------------------------------------
   Status Indicators & Badges
   -------------------------------------------------------------------------- */
.status-dot {
  display: inline-block;
  flex-shrink: 0;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--status-live);
  box-shadow: 0 0 0 3px var(--status-glow);
  position: relative;
}

.status-dot::after {
  content: '';
  position: absolute;
  inset: -2px;
  border-radius: 50%;
  border: 1px solid var(--status-live);
  animation: pulse-ring 2.5s cubic-bezier(0.215, 0.61, 0.355, 1) infinite;
}

@keyframes pulse-ring {
  0% { transform: scale(0.9); opacity: 0.8; }
  60%, 100% { transform: scale(2.4); opacity: 0; }
}

/* --------------------------------------------------------------------------
   Buttons & Links
   -------------------------------------------------------------------------- */
.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  min-height: 48px;
  padding: 12px 24px;
  border-radius: var(--radius-md);
  font-size: 14px;
  font-weight: 500;
  letter-spacing: -0.01em;
  transition: background-color var(--transition-fast), color var(--transition-fast), transform var(--transition-fast), box-shadow var(--transition-fast), border-color var(--transition-fast);
  white-space: nowrap;
}

.primary {
  background: var(--green);
  color: #ffffff;
  box-shadow: 0 2px 10px var(--accent-glow);
  border: 1px solid transparent;
}

.primary:hover {
  background: var(--green-hover);
  color: #ffffff;
  transform: translateY(-2px);
  box-shadow: 0 6px 18px var(--accent-glow);
}

.cv-button {
  background: var(--surface);
  color: var(--ink);
  border: 1px solid var(--line-strong);
  box-shadow: var(--shadow-sm);
}

.cv-button:hover {
  background: var(--surface-alt);
  border-color: var(--green);
  color: var(--green);
  transform: translateY(-2px);
}

.text-link {
  display: inline-flex;
  gap: 8px;
  align-items: center;
  font-size: 14px;
  font-weight: 500;
  color: var(--green);
  border-bottom: 1.5px solid transparent;
  padding-bottom: 2px;
  transition: border-color var(--transition-fast), color var(--transition-fast), transform var(--transition-fast);
}

.text-link:hover {
  border-color: var(--green);
  color: var(--green-hover);
  transform: translateX(2px);
}

/* --------------------------------------------------------------------------
   Header & Navigation
   -------------------------------------------------------------------------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: var(--header-bg);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--line);
  transition: background-color var(--transition-base), border-color var(--transition-base);
}

.nav-wrap {
  height: 80px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.wordmark {
  font-weight: 700;
  font-size: 26px;
  letter-spacing: -0.05em;
  color: var(--ink);
  display: inline-flex;
  align-items: baseline;
}

.wordmark span {
  color: var(--green);
}

nav#site-nav {
  display: flex;
  align-items: center;
  gap: 28px;
  font-size: 14px;
  font-weight: 500;
}

nav#site-nav a {
  color: var(--muted);
  padding: 6px 10px;
  border-radius: var(--radius-sm);
  transition: color var(--transition-fast), background-color var(--transition-fast);
}

nav#site-nav a:hover {
  color: var(--ink);
  background-color: var(--surface-alt);
}

.nav-contact {
  border: 1px solid var(--line-strong) !important;
  color: var(--ink) !important;
  background: var(--surface);
  padding: 8px 16px !important;
  border-radius: var(--radius-full) !important;
  box-shadow: var(--shadow-sm);
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.nav-contact:hover {
  border-color: var(--green) !important;
  color: var(--green) !important;
  transform: translateY(-1px);
}

/* Theme Toggle Button */
.theme-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 42px;
  height: 42px;
  border-radius: var(--radius-full);
  border: 1px solid var(--line);
  background: var(--surface);
  color: var(--ink);
  box-shadow: var(--shadow-sm);
  transition: border-color var(--transition-fast), transform var(--transition-fast), background-color var(--transition-fast);
  flex-shrink: 0;
}

.theme-toggle:hover {
  border-color: var(--green);
  transform: rotate(15deg);
}

.theme-sun {
  display: none;
}

.menu-toggle {
  display: none;
}

/* --------------------------------------------------------------------------
   Hero Section
   -------------------------------------------------------------------------- */
.hero {
  padding-block: 80px 72px;
  display: grid;
  grid-template-columns: 1.25fr 1fr;
  gap: 64px;
  align-items: center;
}

.hero-copy {
  display: flex;
  flex-direction: column;
}

.hero-copy .eyebrow {
  margin-bottom: 20px;
  background: var(--surface);
  border: 1px solid var(--line);
  padding: 6px 14px;
  border-radius: var(--radius-full);
  display: inline-flex;
  align-self: flex-start;
  box-shadow: var(--shadow-sm);
}

.hero h1 {
  margin-bottom: 24px;
  font-size: clamp(40px, 5vw, 62px);
  letter-spacing: -0.04em;
  line-height: 1.1;
  color: var(--ink);
}

.hero-intro {
  max-width: 520px;
  font-size: 18px;
  line-height: 1.75;
  color: var(--muted);
  margin-bottom: 32px;
}

.hero-actions {
  display: flex;
  align-items: center;
  gap: 18px;
  flex-wrap: wrap;
}

.opportunity {
  font-size: 13px;
  margin-top: 36px;
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--ink-secondary);
  background: var(--surface);
  border: 1px solid var(--line);
  padding: 10px 18px;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  width: fit-content;
}

.opportunity span {
  font-size: 16px;
  color: var(--green);
}

/* --------------------------------------------------------------------------
   Hero System Architecture Card
   -------------------------------------------------------------------------- */
.system-card {
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: var(--surface);
  box-shadow: var(--shadow-lg);
  overflow: hidden;
  transition: transform var(--transition-base), box-shadow var(--transition-base);
}

.system-card:hover {
  box-shadow: var(--shadow-card-hover);
}

.system-top {
  padding: 16px 22px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--line);
  background: var(--surface-alt);
  color: var(--muted);
}

.system-top .mono {
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.08em;
}

.mini-dots {
  font-size: 8px;
  letter-spacing: 4px;
  color: var(--muted-light);
}

.system-body {
  padding: 24px;
}

.system-caption {
  font-size: 13px;
  margin-bottom: 20px;
  color: var(--muted);
}

.system-node {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  padding: 16px 18px;
  display: flex;
  align-items: center;
  gap: 14px;
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition-fast), border-color var(--transition-fast);
}

.system-node:hover {
  border-color: var(--line-strong);
}

.node-symbol {
  display: grid;
  place-items: center;
  font-family: var(--font-mono);
  width: 40px;
  height: 40px;
  border-radius: var(--radius-sm);
  background: var(--surface-alt);
  color: var(--green);
  font-size: 18px;
  font-weight: 600;
  flex-shrink: 0;
}

.system-node strong {
  display: block;
  font-size: 14px;
  font-weight: 600;
  color: var(--ink);
}

.system-node small {
  display: block;
  font-size: 11px;
  margin-top: 3px;
  color: var(--muted);
}

.node-label {
  margin-left: auto;
  font-size: 11px;
  color: var(--muted-light);
}

.featured-node {
  background: var(--green);
  color: #ffffff;
  border-color: var(--green);
  box-shadow: 0 4px 14px var(--accent-glow);
}

.featured-node strong {
  color: #ffffff;
}

.featured-node .node-symbol {
  background: rgba(255, 255, 255, 0.15);
  color: #ffffff;
}

.featured-node small {
  color: rgba(255, 255, 255, 0.85);
}

.featured-node .node-label {
  color: rgba(255, 255, 255, 0.7);
}

.connector {
  height: 32px;
  position: relative;
  margin-left: 36px;
  border-left: 2px dashed var(--line-strong);
}

.connector span {
  position: absolute;
  left: 14px;
  top: 6px;
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--muted);
  background: var(--surface);
  padding: 1px 6px;
  border-radius: 3px;
}

.system-bottom {
  padding: 14px 22px;
  display: flex;
  align-items: center;
  gap: 12px;
  border-top: 1px solid var(--line);
  background: var(--surface-alt);
  font-size: 12px;
  color: var(--muted);
}

.system-bottom > span:last-child {
  margin-left: auto;
  font-size: 16px;
  color: var(--green);
}

.system-bottom .status-dot {
  width: 6px;
  height: 6px;
}

/* --------------------------------------------------------------------------
   Core Toolkit Strip
   -------------------------------------------------------------------------- */
.stack-strip {
  border-block: 1px solid var(--line);
  background: var(--surface);
  margin-bottom: var(--space-3xl);
}

.stack-strip .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  min-height: 80px;
  flex-wrap: wrap;
  padding-block: 12px;
}

.stack-strip .mono {
  font-size: 11px;
  font-weight: 600;
  color: var(--green);
  letter-spacing: 0.08em;
}

.stack-strip span:not(.mono) {
  font-size: 15px;
  font-weight: 500;
  color: var(--ink);
  padding: 6px 14px;
  background: var(--surface-alt);
  border-radius: var(--radius-full);
  border: 1px solid var(--line);
  letter-spacing: -0.01em;
}

/* --------------------------------------------------------------------------
   Portfolio & Projects Showcase
   -------------------------------------------------------------------------- */
.project-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 32px;
}

.project-card {
  position: relative;
  display: flex;
  flex-direction: column;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: 32px;
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition-base), box-shadow var(--transition-base), border-color var(--transition-base);
}

.project-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-card-hover);
  border-color: var(--green-border);
}

.curated-project {
  border-top: 3px solid var(--green);
}

.project-number {
  display: block;
  color: var(--muted-light);
  font-size: 11px;
  font-weight: 600;
  margin-bottom: 20px;
}

.project-visual {
  height: 260px;
  border-radius: var(--radius-md);
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  border: 1px solid var(--line);
  background: var(--surface-alt);
  margin-bottom: 24px;
}

.project-visual img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-slow);
}

.project-card:hover .project-visual img {
  transform: scale(1.04);
}

.round-arrow {
  position: absolute;
  bottom: 16px;
  right: 16px;
  z-index: 2;
  border-radius: var(--radius-full);
  width: 40px;
  height: 40px;
  background: var(--surface);
  color: var(--ink);
  box-shadow: var(--shadow-md);
  display: grid;
  place-items: center;
  font-size: 16px;
  transition: background-color var(--transition-fast), color var(--transition-fast), transform var(--transition-fast);
}

.project-card:hover .round-arrow {
  background: var(--green);
  color: #ffffff;
  transform: rotate(45deg);
}

.project-meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 12px;
}

.project-meta .eyebrow {
  margin-bottom: 0;
  font-size: 10px;
}

.project-meta .mono {
  font-size: 11px;
  color: var(--muted);
}

.project-card h3 {
  margin-bottom: 12px;
  font-size: 24px;
}

.project-card h3 a {
  color: var(--ink);
  transition: color var(--transition-fast);
}

.project-card h3 a:hover {
  color: var(--green);
}

.project-card > p {
  font-size: 15px;
  line-height: 1.7;
  color: var(--muted);
  margin-bottom: 20px;
  flex-grow: 1;
}

.tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 20px;
}

.tags span {
  padding: 5px 12px;
  border: 1px solid var(--line);
  background: var(--surface-alt);
  border-radius: var(--radius-sm);
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
  color: var(--ink-secondary);
}

.case-link {
  margin-top: auto;
  align-self: flex-start;
}

.filters {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin-bottom: 32px;
}

.filter {
  border: 1px solid var(--line);
  background: var(--surface);
  color: var(--muted);
  border-radius: var(--radius-full);
  padding: 8px 18px;
  font-size: 13px;
  font-weight: 500;
  transition: all var(--transition-fast);
}

.filter:hover {
  border-color: var(--line-strong);
  color: var(--ink);
}

.filter.active {
  background: var(--green);
  color: #ffffff;
  border-color: var(--green);
  box-shadow: 0 2px 8px var(--accent-glow);
}

.more-projects-title {
  margin: 64px 0 28px;
  font-size: 28px;
}

.all-projects-link {
  margin-top: 40px;
}

/* --------------------------------------------------------------------------
   Experience & Resume Timeline
   -------------------------------------------------------------------------- */
.experience-section {
  background: var(--surface-alt);
  border-block: 1px solid var(--line);
}

.split-section {
  display: grid;
  grid-template-columns: 1fr 1.6fr;
  gap: 80px;
}

.section-sidebar > p:not(.eyebrow) {
  font-size: 15px;
  margin-block: 16px 28px;
  color: var(--muted);
}

.timeline {
  display: flex;
  flex-direction: column;
}

.timeline-item {
  position: relative;
  padding: 0 0 40px 32px;
  border-left: 2px solid var(--line-strong);
}

.timeline-item::before {
  content: '';
  position: absolute;
  width: 12px;
  height: 12px;
  background: var(--surface);
  border: 3px solid var(--green);
  border-radius: 50%;
  top: 4px;
  left: -7px;
  box-shadow: 0 0 0 4px var(--paper);
}

.timeline-item:last-child {
  padding-bottom: 0;
  border-left-color: transparent;
}

.timeline-top {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  font-size: 12px;
  margin-bottom: 10px;
  color: var(--muted);
}

.timeline-top .mono {
  font-size: 12px;
  font-weight: 600;
  color: var(--green);
}

.timeline-item h3 {
  font-size: 22px;
  color: var(--ink);
}

.company {
  font-size: 15px;
  font-weight: 600;
  margin-top: 4px;
  color: var(--ink-secondary);
}

.rich-text {
  font-size: 15px;
  color: var(--muted);
  margin-top: 14px;
  line-height: 1.75;
}

.rich-text ul {
  padding-left: 20px;
  margin: 10px 0 0;
}

.rich-text li {
  margin-bottom: 8px;
}

.education {
  margin-top: 48px;
  padding-top: 36px;
  border-top: 1px solid var(--line);
}

.education article {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  padding: 20px 24px;
  margin-top: 16px;
  box-shadow: var(--shadow-sm);
}

.education p {
  font-size: 14px;
  color: var(--ink-secondary);
  line-height: 1.6;
}

/* --------------------------------------------------------------------------
   Technical Skills / Services Section
   -------------------------------------------------------------------------- */
.shared-skills {
  gap: 12px;
}

.shared-skills span {
  font-size: 14px;
  font-weight: 500;
  padding: 10px 18px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  color: var(--ink);
  transition: transform var(--transition-fast), border-color var(--transition-fast), color var(--transition-fast);
}

.shared-skills span:hover {
  transform: translateY(-2px);
  border-color: var(--green);
  color: var(--green);
}

/* --------------------------------------------------------------------------
   About Section
   -------------------------------------------------------------------------- */
.about-section {
  border-block: 1px solid var(--line);
  background: var(--surface);
}

.about-grid {
  display: grid;
  grid-template-columns: 0.9fr 1.3fr;
  gap: 80px;
  align-items: center;
}

.portrait {
  width: 100%;
  height: 440px;
  object-fit: cover;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  border: 1px solid var(--line);
}

.identity-art {
  height: 420px;
  background: linear-gradient(135deg, var(--surface-alt), var(--paper));
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: 48px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  position: relative;
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}

.identity-art > span {
  font-size: clamp(36px, 4.2vw, 54px);
  font-weight: 700;
  letter-spacing: -0.04em;
  line-height: 1.15;
  color: var(--ink);
}

.identity-art em {
  color: var(--green);
}

.identity-art small {
  position: absolute;
  bottom: 28px;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.12em;
  color: var(--muted);
}

.about-grid h2 {
  font-size: clamp(32px, 3.5vw, 44px);
  margin-bottom: 24px;
}

.about-copy {
  font-size: 16px;
  line-height: 1.8;
  color: var(--muted);
  margin-bottom: 32px;
}

.about-facts {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  padding-top: 28px;
  border-top: 1px solid var(--line);
}

.about-facts > div {
  background: var(--surface-alt);
  padding: 16px 18px;
  border-radius: var(--radius-md);
  border: 1px solid var(--line);
}

.about-facts .mono {
  display: block;
  font-size: 10px;
  font-weight: 600;
  color: var(--green);
  margin-bottom: 6px;
}

.about-facts strong {
  display: block;
  font-size: 13px;
  font-weight: 600;
  color: var(--ink);
  line-height: 1.4;
}

/* --------------------------------------------------------------------------
   Contact Section & Form
   -------------------------------------------------------------------------- */
.contact-section {
  display: grid;
  grid-template-columns: 1fr 1.15fr;
  gap: 80px;
  align-items: start;
}

.contact-section h2 {
  font-size: clamp(36px, 4.4vw, 56px);
  margin-bottom: 20px;
  line-height: 1.1;
}

.contact-section > div > p:not(.eyebrow) {
  font-size: 16px;
  max-width: 440px;
  line-height: 1.75;
  color: var(--muted);
}

.contact-email {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-top: 28px;
  font-size: 18px;
  font-weight: 600;
  color: var(--green);
  border-bottom: 2px solid var(--green);
  padding-bottom: 4px;
  overflow-wrap: anywhere;
  transition: color var(--transition-fast), border-color var(--transition-fast);
}

.contact-email:hover {
  color: var(--green-hover);
  border-color: var(--green-hover);
}

.social-links {
  display: flex;
  gap: 16px;
  margin-top: 28px;
  flex-wrap: wrap;
}

.social-links a {
  font-size: 13px;
  font-weight: 500;
  color: var(--ink-secondary);
  background: var(--surface);
  border: 1px solid var(--line);
  padding: 8px 16px;
  border-radius: var(--radius-full);
  box-shadow: var(--shadow-sm);
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: border-color var(--transition-fast), color var(--transition-fast), transform var(--transition-fast);
}

.social-links a:hover {
  border-color: var(--green);
  color: var(--green);
  transform: translateY(-2px);
}

.contact-form {
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: var(--surface);
  padding: 36px;
  box-shadow: var(--shadow-lg);
}

.form-heading {
  font-size: 22px;
  font-weight: 600;
  color: var(--ink);
  letter-spacing: -0.02em;
  margin-bottom: 24px;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 18px;
}

.form-field {
  min-width: 0;
}

.full-width {
  grid-column: 1 / -1;
}

label {
  display: block;
  font-size: 12px;
  font-weight: 600;
  color: var(--ink-secondary);
  margin-bottom: 8px;
}

input,
textarea {
  width: 100%;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-sm);
  padding: 12px 14px;
  background: var(--paper);
  color: var(--ink);
  font-size: 14px;
  min-height: 48px;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast), background-color var(--transition-fast);
}

input:focus,
textarea:focus {
  outline: none;
  border-color: var(--green);
  background: var(--surface);
  box-shadow: 0 0 0 3px var(--accent-glow);
}

textarea {
  resize: vertical;
  min-height: 130px;
}

input::placeholder,
textarea::placeholder {
  color: var(--muted-light);
}

.form-note {
  font-size: 12px;
  color: var(--muted);
  margin: 18px 0 24px;
}

.contact-form .button {
  width: 100%;
  justify-content: center;
}

.form-errors,
.errorlist {
  color: #dc2626;
  font-size: 13px;
}

.form-errors {
  padding: 14px 18px;
  background: #fef2f2;
  border: 1px solid #fecaca;
  margin-bottom: 20px;
  border-radius: var(--radius-sm);
}

.errorlist {
  padding-left: 18px;
  margin-top: 6px;
}

.notification {
  padding: 16px 24px;
  margin-block: 24px;
  border: 1px solid #a7f3d0;
  border-radius: var(--radius-md);
  background: #ecfdf5;
  color: #065f46;
  font-weight: 500;
  box-shadow: var(--shadow-sm);
}

/* --------------------------------------------------------------------------
   Footer
   -------------------------------------------------------------------------- */
.site-footer {
  border-top: 1px solid var(--line);
  background: var(--surface);
  padding-block: 48px 32px;
  margin-top: var(--space-4xl);
}

.footer-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 32px;
  flex-wrap: wrap;
  padding-bottom: 32px;
  border-bottom: 1px solid var(--line);
}

.footer-brand .wordmark {
  font-size: 24px;
}

.footer-tagline {
  font-size: 13px;
  color: var(--muted);
  margin-top: 8px;
  max-width: 440px;
}

.footer-nav {
  display: flex;
  align-items: center;
  gap: 20px;
  flex-wrap: wrap;
}

.footer-nav a {
  font-size: 13px;
  font-weight: 500;
  color: var(--muted);
  transition: color var(--transition-fast);
}

.footer-nav a:hover {
  color: var(--green);
}

.back-to-top {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 13px;
  font-weight: 500;
  color: var(--green);
  padding: 8px 14px;
  border: 1px solid var(--line);
  border-radius: var(--radius-full);
  background: var(--surface-alt);
  transition: all var(--transition-fast);
}

.back-to-top:hover {
  border-color: var(--green);
  transform: translateY(-2px);
}

.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 20px;
  font-size: 12px;
  color: var(--muted);
  margin-top: 24px;
  flex-wrap: wrap;
}

.footer-built {
  font-family: var(--font-mono);
  font-size: 11px;
}

/* --------------------------------------------------------------------------
   Case Study & Project Detail Layouts
   -------------------------------------------------------------------------- */
.detail-heading {
  margin-block: 48px 32px;
  max-width: 900px;
}

.detail-heading h1 {
  font-size: clamp(36px, 5.5vw, 68px);
}

.detail-intro {
  font-size: 18px;
  line-height: 1.7;
  margin-top: 20px;
  max-width: 740px;
  color: var(--muted);
}

.detail-facts {
  display: flex;
  gap: 40px;
  align-items: center;
  flex-wrap: wrap;
  padding-block: 24px;
  margin-bottom: 40px;
  border-block: 1px solid var(--line);
}

.detail-facts .mono {
  display: block;
  font-size: 10px;
  font-weight: 600;
  color: var(--green);
  margin-bottom: 4px;
}

.detail-facts strong {
  font-size: 15px;
  font-weight: 600;
  color: var(--ink);
}

.detail-cover {
  width: 100%;
  max-height: 600px;
  object-fit: contain;
  background: var(--surface-alt);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  margin-block: 32px;
}

.detail-gallery {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
  margin-top: 36px;
}

.detail-gallery figure {
  margin: 0;
}

.detail-gallery img,
.detail-gallery video {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
}

.detail-gallery figcaption {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--muted);
  margin-top: 8px;
}

.case-study-sections {
  max-width: 820px;
}

.case-study-sections .project-description {
  padding: 32px 0;
  border-bottom: 1px solid var(--line);
}

.case-study-sections h2 {
  font-size: 26px;
  margin-bottom: 16px;
}

.case-study-sections p {
  line-height: 1.8;
  margin-bottom: 12px;
}

.case-layout {
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: 64px;
  margin-top: 48px;
}

.case-intro {
  margin-top: 12px;
  margin-bottom: 20px;
}

.technical-list {
  padding-left: 20px;
  color: var(--muted);
  line-height: 2.2;
}

.case-note {
  background: var(--surface-alt);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: 32px;
}

.case-note h3 {
  font-size: 22px;
  margin-bottom: 16px;
}

.detail-contact {
  margin-top: 64px;
  padding-top: 36px;
  border-top: 1px solid var(--line);
}

.detail-contact h2 {
  font-size: 32px;
  margin-bottom: 16px;
}

/* --------------------------------------------------------------------------
   Responsive Breakpoints
   -------------------------------------------------------------------------- */
@media (max-width: 1024px) {
  .container {
    width: calc(100% - 48px);
  }
  .hero {
    gap: 40px;
    padding-block: 64px;
  }
  .split-section {
    gap: 48px;
  }
  .about-grid {
    gap: 48px;
  }
  .contact-section {
    gap: 48px;
  }
}

@media (max-width: 768px) {
  html {
    scroll-padding-top: 80px;
  }

  .container {
    width: calc(100% - 32px);
  }

  .section {
    padding-block: 64px;
  }

  .nav-wrap {
    height: 70px;
  }

  .menu-toggle:not([hidden]) {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    border: 1px solid var(--line);
    padding: 8px 14px;
    border-radius: var(--radius-full);
    background: var(--surface);
    color: var(--ink);
    font-size: 13px;
    font-weight: 500;
  }

  .menu-toggle:not([hidden]) + nav#site-nav {
    display: none;
  }

  .menu-toggle:not([hidden]) + nav#site-nav.is-open {
    display: flex;
    position: absolute;
    top: 70px;
    left: 0;
    right: 0;
    padding: 24px;
    background: var(--surface);
    border-bottom: 1px solid var(--line);
    flex-direction: column;
    align-items: stretch;
    gap: 12px;
    box-shadow: var(--shadow-lg);
  }

  .hero {
    grid-template-columns: 1fr;
    gap: 48px;
    padding-block: 48px 40px;
  }

  .hero h1 {
    font-size: clamp(36px, 8vw, 52px);
  }

  .project-grid {
    grid-template-columns: 1fr;
  }

  .split-section {
    grid-template-columns: 1fr;
    gap: 36px;
  }

  .about-grid {
    grid-template-columns: 1fr;
    gap: 36px;
  }

  .portrait,
  .identity-art {
    height: 320px;
  }

  .about-facts {
    grid-template-columns: 1fr;
    gap: 12px;
  }

  .contact-section {
    grid-template-columns: 1fr;
    gap: 40px;
  }

  .contact-form {
    padding: 24px;
  }

  .form-row {
    grid-template-columns: 1fr;
  }

  .case-layout {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .detail-gallery {
    grid-template-columns: 1fr;
  }

  .footer-top {
    flex-direction: column;
    align-items: flex-start;
  }

  .footer-bottom {
    flex-direction: column;
    align-items: flex-start;
    gap: 10px;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  *, *::before, *::after {
    transition: none !important;
    animation: none !important;
  }
}

/* --------------------------------------------------------------------------
   Print Stylesheet
   -------------------------------------------------------------------------- */
@media print {
  body {
    background: white;
    color: black;
    font-size: 11pt;
  }
  .site-header,
  .hero-actions,
  .system-card,
  .contact-form,
  .filters,
  .skip-link,
  .site-footer,
  .theme-toggle,
  .menu-toggle,
  .back-to-top,
  .round-arrow {
    display: none !important;
  }
  .container {
    width: 100%;
  }
  .hero, .section {
    padding-block: 16px;
  }
  .project-grid {
    grid-template-columns: 1fr 1fr;
  }
  .project-card, .timeline-item {
    break-inside: avoid;
  }
}