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

:root {
  --bg: #ffffff;
  --bg-soft: #f7f8fc;
  --primary: #1a1a2e;
  --accent: #e63946;
  --accent-hover: #c1121f;
  --text: #2d3748;
  --text-muted: #718096;
  --border: #e2e8f0;
  --card-shadow: 0 2px 12px rgba(0,0,0,0.08);
  --card-shadow-hover: 0 8px 30px rgba(0,0,0,0.14);
  --radius: 12px;
  --font: 'Segoe UI', system-ui, -apple-system, sans-serif;
}

html { scroll-behavior: smooth; }
body { font-family: var(--font); background: var(--bg); color: var(--text); line-height: 1.6; }
a { text-decoration: none; color: inherit; }
img { max-width: 100%; display: block; }

/* ========== NAV ========== */
.navbar {
  position: sticky; top: 0; z-index: 100;
  background: rgba(255,255,255,0.95);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
  padding: 0 24px;
  height: 64px;
  display: flex; align-items: center; justify-content: space-between;
}
.nav-logo { font-size: 1.3rem; font-weight: 700; color: var(--primary); display: flex; align-items: center; gap: 8px; }
.nav-logo span { color: var(--accent); }
.nav-links { display: flex; gap: 8px; }
.nav-links a {
  padding: 8px 16px; border-radius: 8px; font-size: 0.9rem;
  color: var(--text-muted); transition: all 0.2s;
}
.nav-links a:hover { background: var(--bg-soft); color: var(--primary); }
.nav-links .admin-link { color: var(--accent); font-weight: 600; }

/* ========== HERO ========== */
.hero {
  background: linear-gradient(135deg, var(--primary) 0%, #16213e 50%, #0f3460 100%);
  color: white; text-align: center;
  padding: 80px 24px 60px;
  position: relative; overflow: hidden;
}
.hero::before {
  content: ''; position: absolute; inset: 0;
  background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.03'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
}
.hero-flag { font-size: 3rem; margin-bottom: 16px; }
.hero h1 { font-size: clamp(2rem, 5vw, 3.2rem); font-weight: 800; margin-bottom: 12px; }
.hero p { font-size: 1.1rem; opacity: 0.8; max-width: 480px; margin: 0 auto; }

/* ========== CATEGORY FILTER ========== */
.category-bar {
  display: flex; gap: 10px; flex-wrap: wrap;
  padding: 24px; max-width: 1100px; margin: 0 auto;
}
.cat-btn {
  padding: 8px 20px; border-radius: 50px;
  border: 2px solid var(--border);
  background: white; color: var(--text-muted);
  font-size: 0.875rem; font-weight: 500;
  cursor: pointer; transition: all 0.2s;
}
.cat-btn:hover { border-color: var(--accent); color: var(--accent); }
.cat-btn.active { background: var(--accent); border-color: var(--accent); color: white; }

/* ========== POSTS GRID ========== */
.posts-container { max-width: 1100px; margin: 0 auto; padding: 0 24px 60px; }

.posts-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 28px;
}

.post-card {
  background: white; border-radius: var(--radius);
  box-shadow: var(--card-shadow); overflow: hidden;
  transition: transform 0.25s, box-shadow 0.25s;
  cursor: pointer;
}
.post-card:hover { transform: translateY(-4px); box-shadow: var(--card-shadow-hover); }

.card-img {
  width: 100%; height: 200px;
  object-fit: cover; background: var(--bg-soft);
  display: flex; align-items: center; justify-content: center;
  font-size: 3rem;
}
.card-img img { width: 100%; height: 100%; object-fit: cover; }

.card-body { padding: 20px; }
.card-meta { display: flex; align-items: center; gap: 10px; margin-bottom: 10px; }
.card-cat {
  font-size: 0.75rem; font-weight: 600; text-transform: uppercase; letter-spacing: 0.5px;
  color: var(--accent); background: #fff0f1; padding: 3px 10px; border-radius: 50px;
}
.card-date { font-size: 0.8rem; color: var(--text-muted); }

.card-title { font-size: 1.1rem; font-weight: 700; color: var(--primary); margin-bottom: 8px; line-height: 1.4; }
.card-excerpt { font-size: 0.875rem; color: var(--text-muted); line-height: 1.6; margin-bottom: 16px;
  display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }

.card-footer { display: flex; align-items: center; gap: 16px; padding-top: 14px; border-top: 1px solid var(--border); }
.card-stat { display: flex; align-items: center; gap: 5px; font-size: 0.825rem; color: var(--text-muted); }
.card-stat svg { width: 15px; height: 15px; }

/* ========== LOADING / EMPTY ========== */
.loading { text-align: center; padding: 60px; color: var(--text-muted); }
.spinner {
  width: 36px; height: 36px; border: 3px solid var(--border);
  border-top-color: var(--accent); border-radius: 50%;
  animation: spin 0.7s linear infinite; margin: 0 auto 16px;
}
@keyframes spin { to { transform: rotate(360deg); } }
.empty-state { text-align: center; padding: 80px 24px; color: var(--text-muted); }
.empty-state .icon { font-size: 3rem; margin-bottom: 16px; }

/* ========== POST DETAIL ========== */
.post-detail { max-width: 780px; margin: 0 auto; padding: 40px 24px 80px; }
.post-hero-img { width: 100%; height: 400px; object-fit: cover; border-radius: var(--radius); margin-bottom: 36px; }
.post-meta { display: flex; align-items: center; gap: 12px; margin-bottom: 16px; flex-wrap: wrap; }
.post-cat { font-size: 0.75rem; font-weight: 700; text-transform: uppercase; letter-spacing: 0.5px;
  color: var(--accent); background: #fff0f1; padding: 4px 12px; border-radius: 50px; }
.post-date { font-size: 0.875rem; color: var(--text-muted); }
.post-title { font-size: clamp(1.6rem, 4vw, 2.4rem); font-weight: 800; color: var(--primary);
  line-height: 1.25; margin-bottom: 32px; }
.post-content { font-size: 1.05rem; line-height: 1.85; color: var(--text); }
.post-content p { margin-bottom: 20px; }
.post-content h2 { font-size: 1.5rem; font-weight: 700; color: var(--primary); margin: 36px 0 16px; }
.post-content h3 { font-size: 1.2rem; font-weight: 600; color: var(--primary); margin: 28px 0 12px; }
.post-content ul, .post-content ol { padding-left: 24px; margin-bottom: 20px; }
.post-content li { margin-bottom: 8px; }
.post-content img { border-radius: 10px; margin: 24px 0; }
.post-content blockquote {
  border-left: 4px solid var(--accent); padding: 16px 20px;
  background: var(--bg-soft); border-radius: 0 8px 8px 0; margin: 24px 0;
  font-style: italic; color: var(--text-muted);
}

/* ========== LIKE BUTTON ========== */
.like-section { margin: 40px 0; text-align: center; }
.like-btn {
  display: inline-flex; align-items: center; gap: 10px;
  padding: 14px 32px; border-radius: 50px;
  border: 2px solid var(--border); background: white;
  font-size: 1rem; font-weight: 600; cursor: pointer; transition: all 0.25s;
  color: var(--text-muted);
}
.like-btn:hover { border-color: var(--accent); color: var(--accent); transform: scale(1.04); }
.like-btn.liked { background: var(--accent); border-color: var(--accent); color: white; }
.like-btn .heart { font-size: 1.2rem; }

/* ========== COMMENTS ========== */
.comments-section { margin-top: 48px; border-top: 2px solid var(--border); padding-top: 40px; }
.comments-section h3 { font-size: 1.3rem; font-weight: 700; margin-bottom: 28px; color: var(--primary); }

.comment-form { background: var(--bg-soft); border-radius: var(--radius); padding: 24px; margin-bottom: 36px; }
.comment-form h4 { font-size: 1rem; font-weight: 600; margin-bottom: 16px; color: var(--primary); }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; margin-bottom: 14px; }
.form-group { display: flex; flex-direction: column; gap: 6px; }
.form-group label { font-size: 0.825rem; font-weight: 600; color: var(--text-muted); text-transform: uppercase; letter-spacing: 0.4px; }
.form-group input, .form-group textarea, .form-group select {
  padding: 11px 14px; border: 2px solid var(--border);
  border-radius: 8px; font-size: 0.95rem; font-family: var(--font);
  background: white; color: var(--text); transition: border-color 0.2s;
  width: 100%;
}
.form-group input:focus, .form-group textarea:focus, .form-group select:focus {
  outline: none; border-color: var(--accent);
}
.form-group textarea { resize: vertical; min-height: 100px; }
.submit-btn {
  padding: 12px 28px; background: var(--accent); color: white;
  border: none; border-radius: 8px; font-size: 0.95rem; font-weight: 600;
  cursor: pointer; transition: background 0.2s;
}
.submit-btn:hover { background: var(--accent-hover); }
.submit-btn:disabled { opacity: 0.6; cursor: not-allowed; }

.comment-list { display: flex; flex-direction: column; gap: 20px; }
.comment-item {
  background: white; border: 1px solid var(--border);
  border-radius: 10px; padding: 20px;
}
.comment-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 8px; }
.comment-nick { font-weight: 700; font-size: 0.95rem; color: var(--primary); }
.comment-date { font-size: 0.8rem; color: var(--text-muted); }
.comment-text { font-size: 0.95rem; color: var(--text); line-height: 1.7; }

/* ========== BACK BUTTON ========== */
.back-btn {
  display: inline-flex; align-items: center; gap: 6px;
  color: var(--text-muted); font-size: 0.9rem; padding: 10px 0; margin-bottom: 24px;
  transition: color 0.2s;
}
.back-btn:hover { color: var(--accent); }

/* ========== ADMIN ========== */
.admin-page { max-width: 900px; margin: 0 auto; padding: 40px 24px 80px; }
.admin-header { display: flex; align-items: center; justify-content: space-between; margin-bottom: 36px; flex-wrap: wrap; gap: 16px; }
.admin-header h1 { font-size: 1.8rem; font-weight: 800; color: var(--primary); }
.btn-primary { padding: 11px 24px; background: var(--accent); color: white; border: none; border-radius: 8px; font-size: 0.9rem; font-weight: 600; cursor: pointer; transition: background 0.2s; }
.btn-primary:hover { background: var(--accent-hover); }
.btn-secondary { padding: 11px 24px; background: white; color: var(--text); border: 2px solid var(--border); border-radius: 8px; font-size: 0.9rem; font-weight: 600; cursor: pointer; transition: all 0.2s; }
.btn-secondary:hover { border-color: var(--text); }
.btn-danger { padding: 8px 16px; background: white; color: #e53e3e; border: 2px solid #e53e3e; border-radius: 6px; font-size: 0.825rem; font-weight: 600; cursor: pointer; transition: all 0.2s; }
.btn-danger:hover { background: #e53e3e; color: white; }

.login-card { max-width: 400px; margin: 80px auto; background: white; border-radius: var(--radius); box-shadow: var(--card-shadow); padding: 40px; text-align: center; }
.login-card h2 { font-size: 1.5rem; font-weight: 700; margin-bottom: 8px; }
.login-card p { color: var(--text-muted); margin-bottom: 28px; }
.login-card input { width: 100%; padding: 12px 16px; border: 2px solid var(--border); border-radius: 8px; font-size: 1rem; margin-bottom: 14px; text-align: center; letter-spacing: 3px; }
.login-card input:focus { outline: none; border-color: var(--accent); }
.login-error { color: var(--accent); font-size: 0.875rem; margin-top: 10px; }

.post-form { background: white; border: 1px solid var(--border); border-radius: var(--radius); padding: 32px; margin-bottom: 36px; }
.post-form h3 { font-size: 1.2rem; font-weight: 700; margin-bottom: 24px; color: var(--primary); }
.post-form .form-group { margin-bottom: 18px; }
.post-form .form-group label { font-size: 0.825rem; font-weight: 600; color: var(--text-muted); text-transform: uppercase; letter-spacing: 0.4px; display: block; margin-bottom: 6px; }
.post-form textarea { min-height: 200px; }
.form-actions { display: flex; gap: 12px; margin-top: 24px; }

.admin-posts-list { display: flex; flex-direction: column; gap: 14px; }
.admin-post-item {
  background: white; border: 1px solid var(--border); border-radius: 10px;
  padding: 18px 20px; display: flex; align-items: center; gap: 16px;
}
.admin-post-thumb { width: 60px; height: 60px; border-radius: 8px; object-fit: cover; background: var(--bg-soft); flex-shrink: 0; display: flex; align-items: center; justify-content: center; font-size: 1.5rem; overflow: hidden; }
.admin-post-thumb img { width: 100%; height: 100%; object-fit: cover; }
.admin-post-info { flex: 1; min-width: 0; }
.admin-post-title { font-weight: 700; font-size: 0.95rem; color: var(--primary); margin-bottom: 4px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.admin-post-meta { font-size: 0.8rem; color: var(--text-muted); }
.admin-post-actions { display: flex; gap: 8px; flex-shrink: 0; }
.btn-edit { padding: 8px 16px; background: white; color: var(--primary); border: 2px solid var(--border); border-radius: 6px; font-size: 0.825rem; font-weight: 600; cursor: pointer; transition: all 0.2s; }
.btn-edit:hover { border-color: var(--primary); }

.img-preview { width: 100%; height: 200px; object-fit: cover; border-radius: 8px; margin-top: 10px; display: none; }
.img-preview.show { display: block; }

/* ========== TOAST ========== */
.toast {
  position: fixed; bottom: 28px; right: 28px; z-index: 9999;
  background: var(--primary); color: white;
  padding: 14px 22px; border-radius: 10px;
  font-size: 0.9rem; font-weight: 500;
  transform: translateY(80px); opacity: 0;
  transition: all 0.3s; box-shadow: 0 8px 24px rgba(0,0,0,0.2);
}
.toast.show { transform: translateY(0); opacity: 1; }
.toast.success { background: #38a169; }
.toast.error { background: #e53e3e; }

/* ========== FOOTER ========== */
footer { background: var(--primary); color: rgba(255,255,255,0.6); text-align: center; padding: 28px 24px; font-size: 0.875rem; }
footer span { color: var(--accent); }

/* ========== RESPONSIVE ========== */
@media (max-width: 640px) {
  .hero { padding: 60px 20px 40px; }
  .posts-grid { grid-template-columns: 1fr; }
  .form-row { grid-template-columns: 1fr; }
  .post-hero-img { height: 240px; }
  .admin-post-item { flex-wrap: wrap; }
  .admin-post-actions { width: 100%; }
}