/* ============================================================
   Seres Portfolio · Design System
   简约学术风 · Minimal Academic Style
   ============================================================ */

/* --- 1. Design Tokens --- */
:root {
  /* Colors */
  --navy: #0B1F3A;
  --navy-hover: #142E54;
  --navy-light: #1E3A5F;
  --blue: #2563EB;
  --blue-soft: #DBEAFE;
  --bg: #FFFFFF;
  --surface: #F8FAFC;
  --surface-hover: #F1F5F9;
  --border: #E2E8F0;
  --border-light: #F1F5F9;
  --text: #111827;
  --text-sub: #6B7280;
  --text-muted: #9CA3AF;

  /* Typography */
  --font-display: "Noto Serif SC", "Source Han Serif SC", Georgia, "Times New Roman", serif;
  --font-body: "Noto Sans SC", "Source Han Sans SC", -apple-system, "Segoe UI", Roboto, sans-serif;
  --font-mono: "JetBrains Mono", "Fira Code", Menlo, Consolas, monospace;

  /* Spacing (4px base) */
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 20px;
  --space-6: 24px;
  --space-8: 32px;
  --space-10: 40px;
  --space-12: 48px;
  --space-16: 64px;
  --space-24: 96px;

  /* Radius */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;
  --radius-pill: 100px;

  /* Shadows */
  --shadow-sm: 0 1px 2px rgba(11, 31, 58, 0.06);
  --shadow-md: 0 4px 12px rgba(11, 31, 58, 0.08);
  --shadow-lg: 0 8px 24px rgba(11, 31, 58, 0.12);
  --shadow-nav: 0 1px 0 rgba(11, 31, 58, 0.06);

  /* Layout */
  --max-w: 1200px;
  --nav-h: 64px;

  /* Motion */
  --ease: cubic-bezier(0.4, 0, 0.2, 1);
  --dur: 300ms;
}

/* --- 2. Reset & Base --- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

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

body {
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.65;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; transition: color var(--dur) var(--ease); }
button { font-family: inherit; cursor: pointer; border: none; background: none; }

/* --- 3. Layout Utilities --- */
.container {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 var(--space-6);
}

.section {
  padding: var(--space-24) 0;
}

.section-title {
  font-family: var(--font-display);
  font-size: 32px;
  font-weight: 700;
  color: var(--navy);
  margin-bottom: var(--space-2);
  letter-spacing: -0.5px;
}

.section-subtitle {
  font-size: 14px;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 2px;
  font-weight: 500;
  margin-bottom: var(--space-10);
}

.section-header {
  text-align: center;
  margin-bottom: var(--space-16);
}

/* --- 4. Navigation --- */
.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: var(--nav-h);
  background: rgba(255,255,255,0.92);
  backdrop-filter: saturate(180%) blur(12px);
  -webkit-backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid var(--border-light);
  z-index: 100;
  transition: box-shadow var(--dur) var(--ease);
}

.nav.scrolled {
  box-shadow: var(--shadow-nav);
}

.nav-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  height: 100%;
  padding: 0 var(--space-6);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo {
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 700;
  color: var(--navy);
  letter-spacing: -0.3px;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: var(--space-8);
  list-style: none;
}

.nav-link {
  font-size: 14px;
  font-weight: 500;
  color: var(--text-sub);
  padding: var(--space-2) 0;
  position: relative;
  transition: color var(--dur) var(--ease);
}

.nav-link::after {
  content: "";
  position: absolute;
  left: 0; bottom: -2px;
  width: 0; height: 2px;
  background: var(--navy);
  transition: width var(--dur) var(--ease);
}

.nav-link:hover,
.nav-link.active {
  color: var(--navy);
}

.nav-link:hover::after,
.nav-link.active::after {
  width: 100%;
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: var(--space-4);
}

.lang-switch {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-1) var(--space-3);
  border-radius: var(--radius-pill);
  background: var(--surface);
  font-size: 13px;
  font-weight: 500;
  color: var(--text-sub);
  border: 1px solid var(--border-light);
  cursor: pointer;
  transition: all var(--dur) var(--ease);
}

.lang-switch:hover {
  background: var(--blue-soft);
  color: var(--navy);
  border-color: var(--blue-soft);
}

.lang-connector {
  color: var(--text-muted);
}

.lang-active {
  color: var(--navy);
  font-weight: 600;
}

/* Mobile menu */
.nav-toggle {
  display: none;
  padding: var(--space-2);
  color: var(--navy);
}

/* --- 5. Hero Section --- */
.hero {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: calc(var(--nav-h) + var(--space-16)) var(--space-6) var(--space-16);
  position: relative;
  overflow: hidden;
}

/* Subtle background decoration */
.hero::before {
  content: "";
  position: absolute;
  top: -20%; right: -15%;
  width: 600px; height: 600px;
  background: radial-gradient(circle, rgba(37, 99, 235, 0.04) 0%, transparent 70%);
  pointer-events: none;
}

.hero::after {
  content: "";
  position: absolute;
  bottom: -10%; left: -10%;
  width: 400px; height: 400px;
  background: radial-gradient(circle, rgba(11, 31, 58, 0.03) 0%, transparent 70%);
  pointer-events: none;
}

.hero-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  width: 100%;
  position: relative;
}

.hero-tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-bottom: var(--space-6);
  animation: fadeUp 0.8s var(--ease) 0.1s both;
}

.tag {
  display: inline-flex;
  align-items: center;
  padding: var(--space-1) var(--space-3);
  font-size: 12px;
  font-weight: 500;
  color: var(--navy);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-pill);
  letter-spacing: 0.3px;
}

.tag-highlight {
  background: var(--navy);
  color: #fff;
  border-color: var(--navy);
}

.hero-name {
  font-family: var(--font-display);
  font-size: clamp(48px, 10vw, 96px);
  font-weight: 700;
  color: var(--navy);
  line-height: 1.05;
  letter-spacing: -1px;
  margin-bottom: var(--space-4);
  animation: fadeUp 0.8s var(--ease) 0.2s both;
}

.hero-name-en {
  font-family: var(--font-display);
  font-size: clamp(20px, 3.5vw, 32px);
  font-weight: 400;
  color: var(--text-sub);
  letter-spacing: 2px;
  margin-bottom: var(--space-8);
  animation: fadeUp 0.8s var(--ease) 0.3s both;
}

.hero-bio {
  font-size: clamp(15px, 1.5vw, 18px);
  line-height: 1.7;
  color: var(--text-sub);
  max-width: 640px;
  animation: fadeUp 0.8s var(--ease) 0.4s both;
}

.hero-contact {
  margin-top: var(--space-12);
  display: flex;
  gap: var(--space-8);
  animation: fadeUp 0.8s var(--ease) 0.5s both;
}

.hero-contact-item {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: 14px;
  color: var(--text-sub);
  transition: color var(--dur) var(--ease);
}

.hero-contact-item:hover {
  color: var(--navy);
}

.hero-contact-item svg {
  width: 18px; height: 18px;
  flex-shrink: 0;
}

/* --- 6. Card Components --- */
.card {
  background: var(--bg);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: var(--space-8);
  transition: all var(--dur) var(--ease);
}

.card:hover {
  border-color: var(--border);
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.card-title {
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 700;
  color: var(--navy);
  margin-bottom: var(--space-4);
}

/* --- 7. About Section --- */
.about-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-8);
}

.about-item {
  padding: var(--space-8);
  border-left: 3px solid var(--navy);
  background: var(--surface);
  border-radius: 0 var(--radius-lg) var(--radius-lg) 0;
}

.about-item h3 {
  font-family: var(--font-display);
  font-size: 20px;
  color: var(--navy);
  margin-bottom: var(--space-3);
}

.about-item p {
  color: var(--text-sub);
  line-height: 1.75;
}

/* --- 8. Education --- */
.education-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-6);
}

.edu-item {
  display: flex;
  gap: var(--space-6);
  padding: var(--space-8);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  background: var(--bg);
  transition: all var(--dur) var(--ease);
}

.edu-item:hover {
  border-color: var(--border);
  box-shadow: var(--shadow-md);
}

.edu-logo {
  width: 56px; height: 56px;
  flex-shrink: 0;
  background: var(--navy);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 22px;
}

.edu-content {
  flex: 1;
}

.edu-school {
  font-family: var(--font-display);
  font-size: 22px;
  font-weight: 700;
  color: var(--navy);
  margin-bottom: 2px;
}

.edu-degree {
  font-size: 15px;
  color: var(--blue);
  font-weight: 500;
  margin-bottom: var(--space-2);
}

.edu-period {
  font-size: 13px;
  color: var(--text-muted);
  font-family: var(--font-mono);
  margin-bottom: var(--space-4);
}

.edu-highlights {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.edu-highlights li {
  display: flex;
  align-items: flex-start;
  gap: var(--space-2);
  font-size: 14px;
  color: var(--text-sub);
}

.edu-highlights li::before {
  content: "—";
  color: var(--blue);
  font-weight: 700;
  flex-shrink: 0;
}

/* --- 9. Political Profile --- */
.political-box {
  background: var(--navy);
  color: #fff;
  border-radius: var(--radius-lg);
  padding: var(--space-10);
  text-align: center;
  position: relative;
  overflow: hidden;
}

.political-box::before {
  content: "";
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--blue) 0%, transparent 100%);
}

.political-subtitle {
  font-family: var(--font-display);
  font-size: 28px;
  font-weight: 700;
  margin-bottom: var(--space-6);
  letter-spacing: 1px;
}

.political-items {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.political-items li {
  list-style: none;
  font-size: 14px;
  opacity: 0.85;
  position: relative;
  padding-left: var(--space-6);
}

.political-items li::before {
  content: "";
  position: absolute;
  left: 0; top: 50%;
  width: 6px; height: 6px;
  background: var(--blue);
  border-radius: 50%;
  transform: translateY(-50%);
}

/* --- 10. Skills --- */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-6);
}

.skill-card {
  padding: var(--space-8);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  background: var(--bg);
  transition: all var(--dur) var(--ease);
  position: relative;
  overflow: hidden;
}

.skill-card::before {
  content: "";
  position: absolute;
  top: 0; left: 0;
  width: 100%; height: 3px;
  background: transparent;
  transition: background var(--dur) var(--ease);
}

.skill-card:hover {
  border-color: var(--navy);
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.skill-card:hover::before {
  background: var(--navy);
}

.skill-icon {
  width: 44px; height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--navy);
  background: var(--surface);
  border-radius: var(--radius-md);
  margin-bottom: var(--space-5);
}

.skill-icon svg {
  width: 22px; height: 22px;
  stroke-width: 1.5;
}

.skill-title {
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 700;
  color: var(--navy);
  margin-bottom: var(--space-4);
}

.skill-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.skill-list li {
  font-size: 14px;
  color: var(--text-sub);
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.skill-list li::before {
  content: "";
  width: 4px; height: 4px;
  background: var(--blue);
  border-radius: 50%;
  flex-shrink: 0;
}

/* --- 11. Experience Timeline --- */
.timeline-keywords {
  display: flex;
  justify-content: center;
  gap: var(--space-4);
  margin-bottom: var(--space-10);
}

.timeline {
  position: relative;
  padding-left: var(--space-8);
  max-width: 720px;
  margin: 0 auto;
}

.timeline::before {
  content: "";
  position: absolute;
  left: 11px; top: 0; bottom: 0;
  width: 2px;
  background: var(--border);
}

.timeline-item {
  position: relative;
  padding-bottom: var(--space-10);
}

.timeline-item:last-child {
  padding-bottom: 0;
}

.timeline-item::before {
  content: "";
  position: absolute;
  left: -32px; top: 8px;
  width: 14px; height: 14px;
  background: var(--navy);
  border-radius: 50%;
  border: 3px solid var(--bg);
  box-shadow: 0 0 0 2px var(--navy);
}

.timeline-role {
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 700;
  color: var(--navy);
  margin-bottom: 2px;
}

.timeline-org {
  font-size: 14px;
  color: var(--blue);
  font-weight: 500;
  margin-bottom: 2px;
}

.timeline-period {
  font-size: 12px;
  color: var(--text-muted);
  font-family: var(--font-mono);
  margin-bottom: var(--space-3);
}

.timeline-desc {
  font-size: 14px;
  color: var(--text-sub);
  line-height: 1.7;
  margin-bottom: var(--space-3);
}

.timeline-skills {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}

/* --- 12. Projects --- */
.project-card {
  background: var(--bg);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: var(--space-10);
  transition: all var(--dur) var(--ease);
  position: relative;
}

.project-card:hover {
  border-color: var(--navy);
  box-shadow: var(--shadow-lg);
}

.project-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: var(--space-6);
  margin-bottom: var(--space-6);
  flex-wrap: wrap;
}

.project-name {
  font-family: var(--font-display);
  font-size: 22px;
  font-weight: 700;
  color: var(--navy);
  line-height: 1.35;
  flex: 1;
  min-width: 280px;
}

.project-result {
  flex-shrink: 0;
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-4);
  background: var(--navy);
  color: #fff;
  border-radius: var(--radius-md);
  font-size: 13px;
  font-weight: 600;
}

.project-meta {
  display: flex;
  gap: var(--space-6);
  margin-bottom: var(--space-6);
}

.project-meta-item {
  font-size: 13px;
  color: var(--text-muted);
}

.project-meta-label {
  color: var(--text-sub);
  font-weight: 500;
  margin-right: var(--space-2);
}

.project-highlights {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}

/* --- 13. Honors Timeline --- */
.honors-timeline {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-4) var(--space-8);
  max-width: 900px;
  margin: 0 auto;
}

.honor-item {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  padding: var(--space-4) var(--space-6);
  background: var(--surface);
  border-radius: var(--radius-md);
  border: 1px solid var(--border-light);
  transition: all var(--dur) var(--ease);
}

.honor-item:hover {
  border-color: var(--navy);
  background: var(--bg);
  box-shadow: var(--shadow-sm);
}

.honor-year {
  flex-shrink: 0;
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 600;
  color: var(--blue);
  min-width: 80px;
  text-align: center;
  padding: var(--space-1) var(--space-2);
  background: var(--blue-soft);
  border-radius: var(--radius-sm);
}

.honor-title {
  font-size: 15px;
  font-weight: 500;
  color: var(--text);
}

/* --- 14. Future Practice --- */
.future-box {
  text-align: center;
  padding: var(--space-16);
  background: linear-gradient(135deg, var(--surface) 0%, #fff 100%);
  border: 2px dashed var(--border);
  border-radius: var(--radius-lg);
}

.future-title {
  font-family: var(--font-display);
  font-size: 36px;
  font-weight: 700;
  color: var(--navy);
  margin-bottom: var(--space-3);
}

.future-subtitle {
  font-size: 16px;
  color: var(--blue);
  font-weight: 500;
  margin-bottom: var(--space-6);
  letter-spacing: 3px;
  text-transform: uppercase;
}

.future-placeholders {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--space-2);
}

.future-tag {
  display: inline-flex;
  align-items: center;
  padding: var(--space-2) var(--space-4);
  font-size: 14px;
  color: var(--text-sub);
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
}

/* --- 15. Contact Section --- */
.contact-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-6);
  max-width: 900px;
  margin: 0 auto;
}

.contact-card {
  text-align: center;
  padding: var(--space-8) var(--space-6);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  background: var(--bg);
  transition: all var(--dur) var(--ease);
}

.contact-card:hover {
  border-color: var(--navy);
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.contact-icon {
  width: 48px; height: 48px;
  margin: 0 auto var(--space-4);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--navy);
  background: var(--surface);
  border-radius: var(--radius-md);
}

.contact-icon svg {
  width: 24px; height: 24px;
  stroke-width: 1.5;
}

.contact-label {
  font-size: 12px;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 1.5px;
  margin-bottom: var(--space-2);
}

.contact-value {
  font-size: 15px;
  font-weight: 500;
  color: var(--text);
}

.contact-value a:hover {
  color: var(--blue);
}

/* --- 16. Footer --- */
.footer {
  padding: var(--space-8) 0;
  border-top: 1px solid var(--border-light);
  text-align: center;
}

.footer-inner {
  color: var(--text-muted);
  font-size: 13px;
}

.footer-built {
  margin-top: var(--space-2);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.5px;
}

/* --- 17. Online Editor Button --- */
.editor-fab {
  position: fixed;
  bottom: var(--space-6);
  right: var(--space-6);
  width: 48px; height: 48px;
  background: var(--navy);
  color: #fff;
  border-radius: var(--radius-pill);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-lg);
  z-index: 200;
  transition: all var(--dur) var(--ease);
}

.editor-fab:hover {
  background: var(--navy-hover);
  transform: scale(1.05);
}

.editor-fab svg {
  width: 22px; height: 22px;
  stroke-width: 1.5;
}

.editor-fab-label {
  position: absolute;
  right: calc(100% + var(--space-3));
  white-space: nowrap;
  font-size: 13px;
  font-weight: 500;
  padding: var(--space-1) var(--space-3);
  background: var(--navy);
  border-radius: var(--radius-sm);
  opacity: 0;
  pointer-events: none;
  transform: translateX(8px);
  transition: all var(--dur) var(--ease);
}

.editor-fab:hover .editor-fab-label {
  opacity: 1;
  transform: translateX(0);
}

/* Editor Modal */
.editor-modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(11, 31, 58, 0.5);
  backdrop-filter: blur(4px);
  z-index: 300;
  display: none;
  align-items: center;
  justify-content: center;
  padding: var(--space-4);
}

.editor-modal-overlay.open {
  display: flex;
  animation: fadeIn 0.2s var(--ease);
}

.editor-modal {
  width: 100%;
  max-width: 720px;
  max-height: 85vh;
  background: var(--bg);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  display: flex;
  flex-direction: column;
  animation: slideUp 0.3s var(--ease);
}

.editor-modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--space-6) var(--space-8);
  border-bottom: 1px solid var(--border-light);
}

.editor-modal-title {
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 700;
  color: var(--navy);
}

.editor-close {
  width: 32px; height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-md);
  color: var(--text-muted);
  transition: all var(--dur) var(--ease);
}

.editor-close:hover {
  background: var(--surface);
  color: var(--navy);
}

.editor-close svg {
  width: 20px; height: 20px;
}

.editor-modal-body {
  flex: 1;
  overflow-y: auto;
  padding: var(--space-6) var(--space-8);
}

.editor-modal-footer {
  display: flex;
  gap: var(--space-3);
  justify-content: flex-end;
  padding: var(--space-6) var(--space-8);
  border-top: 1px solid var(--border-light);
}

.editor-tabs {
  display: flex;
  gap: var(--space-1);
  margin-bottom: var(--space-6);
  background: var(--surface);
  padding: 3px;
  border-radius: var(--radius-md);
}

.editor-tab {
  flex: 1;
  padding: var(--space-2) var(--space-4);
  font-size: 14px;
  font-weight: 500;
  color: var(--text-sub);
  border-radius: var(--radius-sm);
  transition: all var(--dur) var(--ease);
}

.editor-tab.active {
  background: var(--bg);
  color: var(--navy);
  box-shadow: var(--shadow-sm);
}

.editor-field {
  margin-bottom: var(--space-5);
}

.editor-field-label {
  display: block;
  font-size: 13px;
  font-weight: 600;
  color: var(--navy);
  margin-bottom: var(--space-2);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.editor-input,
.editor-textarea {
  width: 100%;
  padding: var(--space-3) var(--space-4);
  font-family: var(--font-body);
  font-size: 14px;
  color: var(--text);
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  transition: all var(--dur) var(--ease);
}

.editor-input:focus,
.editor-textarea:focus {
  outline: none;
  border-color: var(--blue);
  box-shadow: 0 0 0 3px var(--blue-soft);
}

.editor-textarea {
  min-height: 80px;
  resize: vertical;
  line-height: 1.6;
}

.editor-section {
  margin-bottom: var(--space-8);
  padding-bottom: var(--space-6);
  border-bottom: 1px solid var(--border-light);
}

.editor-section:last-child {
  border-bottom: none;
  margin-bottom: 0;
}

.editor-section-title {
  font-family: var(--font-display);
  font-size: 16px;
  font-weight: 700;
  color: var(--navy);
  margin-bottom: var(--space-4);
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-5);
  font-size: 14px;
  font-weight: 500;
  border-radius: var(--radius-md);
  transition: all var(--dur) var(--ease);
  cursor: pointer;
}

.btn-primary {
  background: var(--navy);
  color: #fff;
}

.btn-primary:hover {
  background: var(--navy-hover);
}

.btn-secondary {
  background: var(--bg);
  color: var(--text);
  border: 1px solid var(--border);
}

.btn-secondary:hover {
  border-color: var(--navy);
  color: var(--navy);
}

.btn-danger {
  background: #FEE2E2;
  color: #DC2626;
  padding: var(--space-1) var(--space-3);
  font-size: 12px;
}

.btn-danger:hover {
  background: #FECACA;
}

.btn-add {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  font-size: 13px;
  font-weight: 500;
  color: var(--blue);
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-md);
  transition: all var(--dur) var(--ease);
}

.btn-add:hover {
  background: var(--blue-soft);
}

.btn-add svg {
  width: 16px; height: 16px;
}

.editor-item-row {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: var(--space-3);
  align-items: start;
  padding: var(--space-4);
  background: var(--surface);
  border-radius: var(--radius-md);
  margin-bottom: var(--space-3);
}

.editor-item-fields {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

/* --- 18. Animations --- */
@keyframes fadeUp {
  from {
    opacity: 0;
    transform: translateY(16px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

@keyframes slideUp {
  from {
    opacity: 0;
    transform: translateY(20px) scale(0.98);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: all 0.8s var(--ease);
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* --- 19. Responsive --- */
@media (max-width: 1024px) {
  .skills-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .honors-timeline {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  :root {
    --nav-h: 56px;
  }

  .section {
    padding: var(--space-16) 0;
  }

  .section-title {
    font-size: 26px;
  }

  .nav-links {
    display: none;
    position: absolute;
    top: 100%;
    left: 0; right: 0;
    background: var(--bg);
    border-bottom: 1px solid var(--border-light);
    flex-direction: column;
    gap: 0;
    padding: var(--space-2);
    box-shadow: var(--shadow-md);
  }

  .nav-links.open {
    display: flex;
  }

  .nav-links li {
    width: 100%;
  }

  .nav-link {
    display: block;
    padding: var(--space-3) var(--space-4);
  }

  .nav-link::after {
    display: none;
  }

  .nav-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
  }

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

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

  .edu-item {
    flex-direction: column;
    gap: var(--space-4);
  }

  .contact-grid {
    grid-template-columns: 1fr;
    max-width: 400px;
  }

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

  .honors-timeline {
    grid-template-columns: 1fr;
  }

  .timeline {
    padding-left: var(--space-6);
  }

  .project-header {
    flex-direction: column;
  }

  .future-title {
    font-size: 28px;
  }

  .editor-modal {
    max-height: 92vh;
    margin: var(--space-2);
    border-radius: var(--radius-md);
  }

  .editor-modal-header,
  .editor-modal-footer {
    padding: var(--space-4) var(--space-5);
  }

  .editor-modal-body {
    padding: var(--space-4) var(--space-5);
  }
}

@media (max-width: 480px) {
  .section {
    padding: var(--space-12) 0;
  }

  .card,
  .skill-card,
  .project-card {
    padding: var(--space-6);
  }

  .editor-fab {
    bottom: var(--space-4);
    right: var(--space-4);
    width: 44px; height: 44px;
  }
}

/* --- 20. Print-friendly --- */
@media print {
  .nav, .editor-fab { display: none; }
  .section { padding: var(--space-8) 0; }
}