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

:root {
  --bg-primary: #0a0a0f;
  --bg-secondary: #12121a;
  --bg-card: #16161f;
  --bg-card-hover: #1c1c28;
  --border: #2a2a3a;
  --text-primary: #e8e8f0;
  --text-secondary: #9898b0;
  --text-muted: #686880;
  --accent: #7c5cfc;
  --accent-glow: rgba(124, 92, 252, 0.35);
  --accent-secondary: #00d4aa;
  --gradient: linear-gradient(135deg, #7c5cfc 0%, #00d4aa 100%);
  --radius: 12px;
  --radius-sm: 8px;
  --shadow: 0 4px 24px rgba(0, 0, 0, 0.4);
  --font-sans: 'Inter', system-ui, -apple-system, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
  --max-width: 1100px;
  --nav-height: 64px;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-sans);
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

a {
  color: inherit;
  text-decoration: none;
}

img {
  max-width: 100%;
  display: block;
}

.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* ── Navigation ───────────────────────────────────────────── */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--nav-height);
  background: rgba(10, 10, 15, 0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  z-index: 100;
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.logo {
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: 1.1rem;
  letter-spacing: -0.02em;
}

.logo-bracket {
  color: var(--accent);
}

.nav-links {
  display: flex;
  gap: 2rem;
  list-style: none;
}

.nav-links a {
  font-size: 0.9rem;
  color: var(--text-secondary);
  transition: color 0.2s;
}

.nav-links a:hover {
  color: var(--text-primary);
}

.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: transform 0.2s, opacity 0.2s;
}

/* ── Hero ─────────────────────────────────────────────────── */
.hero {
  position: relative;
  min-height: 90vh;
  display: flex;
  align-items: center;
  padding-top: var(--nav-height);
  overflow: hidden;
}

.hero-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(124, 92, 252, 0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(124, 92, 252, 0.04) 1px, transparent 1px);
  background-size: 60px 60px;
  mask-image: radial-gradient(ellipse 70% 60% at 50% 40%, black 20%, transparent 80%);
}

.hero-content {
  position: relative;
  z-index: 1;
  padding: 4rem 1.5rem;
}

.hero-tag {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--accent-secondary);
  margin-bottom: 1rem;
  letter-spacing: 0.05em;
}

.hero h1 {
  font-size: clamp(2.4rem, 6vw, 4rem);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -0.03em;
  margin-bottom: 1.25rem;
}

.gradient-text {
  background: var(--gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-sub {
  font-size: 1.15rem;
  color: var(--text-secondary);
  max-width: 520px;
  margin-bottom: 2rem;
}

.hero-actions {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}

.btn {
  display: inline-flex;
  align-items: center;
  padding: 0.75rem 1.5rem;
  border-radius: var(--radius-sm);
  font-size: 0.95rem;
  font-weight: 500;
  transition: transform 0.15s, box-shadow 0.15s, background 0.15s;
}

.btn:hover {
  transform: translateY(-1px);
}

.btn-primary {
  background: var(--accent);
  color: #fff;
  box-shadow: 0 4px 20px var(--accent-glow);
}

.btn-primary:hover {
  box-shadow: 0 6px 28px var(--accent-glow);
}

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

.btn-ghost:hover {
  border-color: var(--accent);
  color: var(--text-primary);
}

/* ── Sections ─────────────────────────────────────────────── */
.section {
  padding: 5rem 0;
}

.section-alt {
  background: var(--bg-secondary);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.section-header {
  margin-bottom: 2.5rem;
}

.section-header h2 {
  font-size: 1.75rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 0.5rem;
}

.section-desc {
  color: var(--text-secondary);
  font-size: 1rem;
}

/* ── Articles Grid ────────────────────────────────────────── */
.articles-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 1.5rem;
}

.article-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.75rem;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  transition: border-color 0.2s, background 0.2s, transform 0.2s;
  cursor: pointer;
}

.article-card:hover {
  background: var(--bg-card-hover);
  border-color: var(--accent);
  transform: translateY(-2px);
}

.article-date {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--accent-secondary);
  letter-spacing: 0.04em;
}

.article-card h3 {
  font-size: 1.1rem;
  font-weight: 600;
  line-height: 1.35;
  letter-spacing: -0.01em;
}

.article-card p {
  font-size: 0.9rem;
  color: var(--text-secondary);
  flex: 1;
  display: -webkit-box;
  -webkit-line-clamp: 4;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.article-read-more {
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--accent);
  margin-top: auto;
}

/* ── Loading & Error States ───────────────────────────────── */
.loading-state,
.error-state,
.empty-state {
  grid-column: 1 / -1;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1rem;
  padding: 3rem;
  color: var(--text-muted);
}

.spinner {
  width: 32px;
  height: 32px;
  border: 3px solid var(--border);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

/* ── Projects Grid ────────────────────────────────────────── */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1.5rem;
}

.project-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.75rem;
  transition: border-color 0.2s, transform 0.2s;
}

.project-card:hover {
  border-color: var(--accent-secondary);
  transform: translateY(-2px);
}

.project-icon {
  font-size: 2rem;
  margin-bottom: 1rem;
}

.project-card h3 {
  font-size: 1.05rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
}

.project-card p {
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin-bottom: 1rem;
}

.project-tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--accent);
  background: rgba(124, 92, 252, 0.1);
  padding: 0.25rem 0.6rem;
  border-radius: 4px;
}

/* ── About ────────────────────────────────────────────────── */
.about-content {
  max-width: 640px;
}

.about-content h2 {
  font-size: 1.75rem;
  font-weight: 700;
  margin-bottom: 1rem;
}

.about-content p {
  color: var(--text-secondary);
  font-size: 1.05rem;
}

/* ── Footer ───────────────────────────────────────────────── */
.footer {
  border-top: 1px solid var(--border);
  padding: 2rem 0;
}

.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
}

.footer p {
  font-size: 0.85rem;
  color: var(--text-muted);
}

.footer-links {
  display: flex;
  gap: 1.5rem;
}

.footer-links a {
  font-size: 0.85rem;
  color: var(--text-secondary);
  transition: color 0.2s;
}

.footer-links a:hover {
  color: var(--accent);
}

/* ── Article Page ─────────────────────────────────────────── */
.page-main {
  padding-top: var(--nav-height);
  min-height: 100vh;
}

.article-page {
  padding: 3rem 0 5rem;
}

.article-page-inner {
  max-width: 720px;
}

.back-link {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin-bottom: 2rem;
  transition: color 0.2s;
}

.back-link:hover {
  color: var(--accent);
}

.article-full {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 2.5rem;
}

.article-full h1 {
  font-size: clamp(1.75rem, 4vw, 2.25rem);
  font-weight: 700;
  line-height: 1.25;
  letter-spacing: -0.02em;
  margin-bottom: 1rem;
}

.article-full .article-date {
  display: block;
  margin-bottom: 2rem;
}

.article-body {
  font-size: 1.05rem;
  color: var(--text-secondary);
  line-height: 1.8;
  white-space: pre-wrap;
}

.page-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1rem;
  padding: 4rem 0;
  color: var(--text-muted);
  text-align: center;
}

/* ── Admin Form ───────────────────────────────────────────── */
.admin-page {
  padding: 3rem 0 5rem;
}

.admin-page-inner {
  max-width: 640px;
}

.admin-header {
  margin-bottom: 2rem;
}

.admin-header h1 {
  font-size: 1.75rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
}

.admin-header p {
  color: var(--text-secondary);
}

.admin-form {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 2rem;
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.form-group label {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-primary);
}

.form-group input,
.form-group textarea {
  font-family: var(--font-sans);
  font-size: 0.95rem;
  color: var(--text-primary);
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 0.75rem 1rem;
  transition: border-color 0.2s, box-shadow 0.2s;
  resize: vertical;
}

.form-group input::placeholder,
.form-group textarea::placeholder {
  color: var(--text-muted);
}

.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-glow);
}

.form-group textarea {
  min-height: 220px;
  line-height: 1.6;
}

.admin-form .btn-primary {
  align-self: flex-start;
  border: none;
  cursor: pointer;
}

.admin-form .btn-primary:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  transform: none;
}

.admin-manage {
  margin-top: 3rem;
}

.admin-manage .admin-header h2 {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
}

.articles-list {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
}

.article-list-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 1rem 1.25rem;
  border-bottom: 1px solid var(--border);
}

.article-list-item:last-child {
  border-bottom: none;
}

.article-list-info {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  min-width: 0;
}

.article-list-title {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text-primary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.article-list-date {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--text-muted);
}

.btn-delete {
  flex-shrink: 0;
  padding: 0.45rem 0.9rem;
  font-size: 0.85rem;
  font-weight: 500;
  font-family: var(--font-sans);
  color: #fff;
  background: #dc3545;
  border: 1px solid #b02a37;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: background 0.2s, transform 0.15s;
}

.btn-delete:hover:not(:disabled) {
  background: #bb2d3b;
  transform: translateY(-1px);
}

.btn-delete:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  transform: none;
}

.articles-list .page-state {
  padding: 2rem;
}

/* ── Responsive ───────────────────────────────────────────── */
@media (max-width: 768px) {
  .nav-links {
    display: none;
    position: absolute;
    top: var(--nav-height);
    left: 0;
    right: 0;
    flex-direction: column;
    gap: 0;
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border);
    padding: 0.5rem 0;
  }

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

  .nav-links li a {
    display: block;
    padding: 0.75rem 1.5rem;
  }

  .nav-toggle {
    display: flex;
  }

  .nav-toggle.active span:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
  }

  .nav-toggle.active span:nth-child(2) {
    opacity: 0;
  }

  .nav-toggle.active span:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
  }

  .hero h1 {
    font-size: 2.2rem;
  }

  .articles-grid,
  .projects-grid {
    grid-template-columns: 1fr;
  }

  .footer-inner {
    flex-direction: column;
    text-align: center;
  }
}