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

:root {
  --font-brand: "DM Sans", system-ui, -apple-system, sans-serif;
  --font-mono: "SF Mono", Menlo, Consolas, monospace;

  --color-primary: #6c5ce7;
  --color-primary-light: #a29bfe;
  --color-primary-dark: #4834d4;
  --color-accent: #00b894;
  --color-link-blue: #0984e3;

  --bg-page: #f8f9fc;
  --bg-card: #ffffff;
  --bg-nav: rgba(248, 249, 252, 0.85);

  --text-primary: #1a1a2e;
  --text-secondary: #4a4a68;
  --text-muted: #8e8ea0;
  --border-color: rgba(178, 182, 189, 0.35);

  --color-light-gray: #f0f0f5;
  --color-mid-gray: #d1d1db;

  --shadow-sm: 0 1px 3px rgba(0,0,0,0.06);
  --shadow-md: 0 4px 16px rgba(0,0,0,0.08);
  --shadow-lg: 0 12px 40px rgba(0,0,0,0.12);
  --shadow-xl: 0 24px 80px rgba(0,0,0,0.18);

  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;

  --max-width: 1200px;
  --nav-height: 64px;
}

html { scroll-behavior: smooth; scroll-padding-top: calc(var(--nav-height) + 24px); }

body {
  font-family: var(--font-brand);
  background: var(--bg-page);
  color: var(--text-secondary);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* ===== NAVIGATION ===== */
.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--nav-height);
  padding: 0 32px;
  background: var(--bg-nav);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-color);
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 18px;
  font-weight: 700;
  color: var(--text-primary);
  text-decoration: none;
  letter-spacing: -0.3px;
}

.brand-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border-radius: 8px;
  background: var(--color-primary);
  color: #fff;
  font-size: 16px;
  font-weight: 700;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 4px;
  list-style: none;
}

.nav-links a {
  display: block;
  padding: 8px 14px;
  font-size: 14px;
  font-weight: 500;
  color: var(--text-secondary);
  text-decoration: none;
  border-radius: var(--radius-sm);
  transition: all 0.15s;
}

.nav-links a:hover {
  color: var(--color-primary);
  background: rgba(108, 92, 231, 0.08);
}

.nav-cta {
  padding: 8px 18px;
  font-size: 13px;
  font-weight: 600;
  color: #fff;
  background: var(--color-primary);
  border: none;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all 0.15s;
  font-family: var(--font-brand);
}

.nav-cta:hover { background: var(--color-primary-dark); transform: translateY(-1px); }

/* Mobile nav toggle */
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}
.nav-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: all 0.2s;
}

@media (max-width: 768px) {
  .nav { padding: 0 16px; }
  .nav-links {
    display: none;
    position: absolute;
    top: var(--nav-height);
    left: 0;
    right: 0;
    flex-direction: column;
    padding: 12px 16px;
    background: var(--bg-nav);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border-color);
    gap: 2px;
  }
  .nav-links.open { display: flex; }
  .nav-toggle { display: flex; }
  .nav-cta { display: none; }
}

/* ===== HERO ===== */
.hero {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 80px 32px 48px;
  text-align: center;
}

.hero-label {
  display: inline-block;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  color: var(--color-primary);
  background: rgba(108, 92, 231, 0.08);
  padding: 6px 14px;
  border-radius: 20px;
  margin-bottom: 20px;
}

.hero h1 {
  font-size: clamp(32px, 5vw, 52px);
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1.15;
  letter-spacing: -1px;
  margin-bottom: 16px;
}

.hero p {
  font-size: 17px;
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto 32px;
  line-height: 1.7;
}

.hero-buttons {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  flex-wrap: wrap;
}

.btn-hero-primary {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 12px 28px;
  font-size: 15px;
  font-weight: 600;
  color: #fff;
  background: var(--color-primary);
  border: none;
  border-radius: var(--radius-md);
  text-decoration: none;
  transition: all 0.2s;
  font-family: var(--font-brand);
  box-shadow: 0 4px 14px rgba(108, 92, 231, 0.3);
}

.btn-hero-primary:hover {
  background: var(--color-primary-dark);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(108, 92, 231, 0.4);
}

.btn-hero-secondary {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 12px 24px;
  font-size: 15px;
  font-weight: 600;
  color: var(--text-primary);
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  text-decoration: none;
  transition: all 0.2s;
  font-family: var(--font-brand);
}

.btn-hero-secondary:hover {
  border-color: var(--color-primary-light);
  color: var(--color-primary);
  transform: translateY(-1px);
  box-shadow: var(--shadow-sm);
}

/* ===== SECTIONS ===== */
.section {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 48px 32px;
}

.section-inner {
  max-width: var(--max-width);
}

.section-label {
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 8px;
}

.section-title {
  font-size: 28px;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -0.5px;
  margin-bottom: 8px;
}

.section-desc {
  font-size: 15px;
  color: var(--text-muted);
  margin-bottom: 28px;
}

/* ===== CARDS GRID ===== */
.projects-grid,
.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 20px;
}

@media (max-width: 420px) {
  .projects-grid, .skills-grid { grid-template-columns: 1fr; }
}

/* ===== CARD ===== */
.card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  overflow: hidden;
  cursor: pointer;
  transition: all 0.25s ease;
  position: relative;
}

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

.card-banner {
  height: 8px;
  width: 100%;
}

.card-body {
  padding: 20px 22px 22px;
}

.card-label {
  display: inline-block;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.8px;
  text-transform: uppercase;
  padding: 3px 8px;
  border-radius: 4px;
  margin-bottom: 10px;
}

.card-title {
  font-size: 17px;
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1.3;
  margin-bottom: 8px;
}

.card-desc {
  font-size: 14px;
  color: var(--text-muted);
  line-height: 1.55;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.card-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 14px;
}

.card-tag {
  font-size: 11px;
  font-weight: 500;
  color: var(--text-muted);
  background: var(--color-light-gray);
  padding: 2px 8px;
  border-radius: 3px;
}

/* ===== NEWS CARDS ===== */
.news-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
  gap: 16px;
}

@media (max-width: 420px) {
  .news-grid { grid-template-columns: 1fr; }
}

.news-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 18px 20px;
  cursor: pointer;
  transition: all 0.2s ease;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

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

.news-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
}

.news-category-badge {
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.8px;
  text-transform: uppercase;
  padding: 2px 7px;
  border-radius: 3px;
  white-space: nowrap;
}

.news-time {
  font-size: 12px;
  color: var(--text-muted);
  white-space: nowrap;
}

.news-title {
  font-size: 15px;
  font-weight: 600;
  color: var(--text-primary);
  line-height: 1.35;
}

.news-summary {
  font-size: 13px;
  color: var(--text-muted);
  line-height: 1.5;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.news-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 5px;
  margin-top: auto;
}

.news-tag {
  font-size: 11px;
  font-weight: 500;
  color: var(--text-muted);
  background: var(--color-light-gray);
  padding: 2px 7px;
  border-radius: 3px;
}

.news-source {
  font-size: 12px;
  color: var(--text-muted);
}

/* ===== NEWS CATEGORY FILTERS ===== */
.news-category-filters {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 24px;
}

.news-filter-btn {
  padding: 7px 16px;
  font-size: 13px;
  font-weight: 600;
  font-family: var(--font-brand);
  color: var(--text-secondary);
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  text-decoration: none;
  cursor: pointer;
  transition: all 0.15s;
  display: inline-block;
}

.news-filter-btn:hover {
  border-color: var(--color-primary-light);
  color: var(--color-primary);
}

.news-filter-btn.active {
  background: var(--color-primary);
  color: #fff;
  border-color: var(--color-primary);
}

/* ===== FOOTER ===== */
.footer {
  text-align: center;
  padding: 32px;
  font-size: 13px;
  color: var(--text-muted);
  border-top: 1px solid var(--border-color);
  margin-top: 24px;
}

/* ===== EMPTY STATE ===== */
.empty-state {
  text-align: center;
  padding: 48px 24px;
  color: var(--text-muted);
  grid-column: 1 / -1;
}

.empty-state .empty-icon { font-size: 48px; margin-bottom: 16px; }
.empty-state p { font-size: 15px; }

/* ===== SCROLLBAR ===== */
.modal::-webkit-scrollbar { width: 6px; }
.modal::-webkit-scrollbar-track { background: transparent; }
.modal::-webkit-scrollbar-thumb { background: var(--color-mid-gray); border-radius: 3px; }

/* ===== RESPONSIVE ===== */
@media (max-width: 768px) {
  .hero { padding: 48px 16px 32px; }
  .section { padding: 32px 16px; }
  .section-title { font-size: 24px; }
  .card-banner { height: 6px; }
}

/* ===== ANIMATIONS ===== */
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(16px); }
  to   { opacity: 1; transform: translateY(0); }
}

.card, .news-card {
  animation: fadeInUp 0.4s ease both;
}

/* ===== NEWS BREADCRUMB ===== */
.news-breadcrumb {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 13px;
  color: var(--text-muted);
  margin-bottom: 16px;
}

.news-breadcrumb a {
  color: var(--color-primary);
  text-decoration: none;
  font-weight: 500;
}

.news-breadcrumb a:hover {
  text-decoration: underline;
}

.breadcrumb-sep {
  color: var(--text-muted);
  opacity: 0.5;
}

.breadcrumb-current {
  font-weight: 600;
  color: var(--text-secondary);
}

.back-btn {
  margin-left: auto;
  font-size: 13px;
  color: var(--color-primary);
  text-decoration: none;
  font-weight: 500;
  transition: all 0.15s;
  white-space: nowrap;
}

.back-btn:hover {
  color: var(--color-primary-dark);
  text-decoration: underline;
}