/* ============================================
   KHALIL · DATA & AI — Estilos globales
   ============================================ */

:root {
  --bg: #080c10;
  --bg2: #0d1117;
  --bg3: #161b22;
  --border: #21262d;
  --accent: #00e5a0;
  --accent2: #0ff;
  --accent3: #f7c948;
  --danger: #f85149;
  --text: #e6edf3;
  --muted: #7d8590;
  --mono: 'IBM Plex Mono', monospace;
  --sans: 'Syne', sans-serif;
  --maxw: 1200px;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--sans);
  overflow-x: hidden;
  min-height: 100vh;
}

/* Grid background */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  background-image:
    linear-gradient(rgba(0,229,160,0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0,229,160,0.03) 1px, transparent 1px);
  background-size: 40px 40px;
  pointer-events: none;
  z-index: 0;
}

a { color: inherit; }

/* ===== NAV ===== */
nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  padding: 18px 48px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: rgba(8,12,16,0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}
.nav-logo {
  font-family: var(--mono);
  font-size: 1rem;
  color: var(--accent);
  letter-spacing: 0.08em;
  text-decoration: none;
}
.nav-logo span { color: var(--muted); }
.nav-links { display: flex; gap: 32px; list-style: none; align-items: center; }
.nav-links a {
  font-family: var(--mono);
  font-size: 0.78rem;
  color: var(--muted);
  text-decoration: none;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  transition: color 0.2s;
  position: relative;
}
.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -4px; left: 0; right: 0;
  height: 1px;
  background: var(--accent);
  transform: scaleX(0);
  transition: transform 0.2s;
}
.nav-links a:hover, .nav-links a.active { color: var(--accent); }
.nav-links a:hover::after, .nav-links a.active::after { transform: scaleX(1); }

.nav-toggle {
  display: none;
  background: none; border: none;
  color: var(--accent);
  font-size: 1.5rem;
  cursor: pointer;
}

/* ===== LAYOUT ===== */
main { position: relative; z-index: 1; }
.container { max-width: var(--maxw); margin: 0 auto; padding: 0 48px; }
.section { padding: 120px 0 80px; }
.section-pad-top { padding-top: 140px; }

/* ===== TYPOGRAPHY HELPERS ===== */
.section-label {
  font-family: var(--mono);
  font-size: 0.72rem;
  color: var(--accent);
  letter-spacing: 0.2em;
  text-transform: uppercase;
  margin-bottom: 16px;
}
.section-label::before { content: '// '; color: var(--muted); }

.section-title {
  font-size: clamp(2.4rem, 5vw, 4rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  margin-bottom: 48px;
  line-height: 1.1;
}
.section-title em {
  font-style: normal;
  color: transparent;
  -webkit-text-stroke: 1px var(--accent);
}

/* ===== BUTTONS ===== */
.btn {
  font-family: var(--mono);
  font-size: 0.8rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  padding: 14px 28px;
  border: 1px solid var(--accent);
  color: var(--accent);
  background: transparent;
  text-decoration: none;
  transition: all 0.2s;
  cursor: pointer;
  display: inline-block;
}
.btn:hover { background: var(--accent); color: var(--bg); }
.btn-ghost { border-color: var(--border); color: var(--muted); }
.btn-ghost:hover { border-color: var(--muted); background: transparent; color: var(--text); }
.btn-solid { background: var(--accent); color: var(--bg); }
.btn-solid:hover { background: transparent; color: var(--accent); }
.btn:disabled { opacity: 0.5; cursor: not-allowed; }

/* ===== HERO ===== */
.hero {
  display: flex;
  flex-direction: column;
  justify-content: center;
  min-height: 92vh;
  position: relative;
}
.hero-tag {
  font-family: var(--mono);
  font-size: 0.75rem;
  color: var(--accent);
  letter-spacing: 0.2em;
  text-transform: uppercase;
  margin-bottom: 24px;
  opacity: 0; animation: fadeUp 0.6s 0.2s forwards;
}
.hero-tag::before { content: '> '; color: var(--muted); }
.hero-title {
  font-size: clamp(3.5rem, 9vw, 7rem);
  font-weight: 800;
  line-height: 0.95;
  letter-spacing: -0.03em;
  margin-bottom: 32px;
  opacity: 0; animation: fadeUp 0.7s 0.35s forwards;
}
.hero-title .name { color: var(--accent); display: block; }
.hero-title .role {
  color: var(--bg3);
  -webkit-text-stroke: 1px var(--border);
  display: block;
}
.hero-desc {
  font-family: var(--mono);
  font-size: 0.95rem;
  color: var(--muted);
  line-height: 1.8;
  max-width: 560px;
  margin-bottom: 48px;
  opacity: 0; animation: fadeUp 0.7s 0.5s forwards;
}
.hero-desc strong { color: var(--text); }
.hero-ctas { display: flex; gap: 16px; flex-wrap: wrap; opacity: 0; animation: fadeUp 0.7s 0.65s forwards; }
.hero-stats {
  display: flex; gap: 48px;
  margin-top: 80px; padding-top: 48px;
  border-top: 1px solid var(--border);
  opacity: 0; animation: fadeUp 0.7s 0.8s forwards;
}
.stat-num { font-size: 2.2rem; font-weight: 800; color: var(--accent); font-family: var(--mono); }
.stat-label {
  font-family: var(--mono); font-size: 0.72rem; color: var(--muted);
  text-transform: uppercase; letter-spacing: 0.12em; margin-top: 4px;
}

.terminal-deco {
  position: absolute; right: 0; top: 50%;
  transform: translateY(-50%);
  background: var(--bg2); border: 1px solid var(--border);
  border-radius: 8px; padding: 24px; width: 320px;
  font-family: var(--mono); font-size: 0.78rem;
  opacity: 0; animation: fadeUp 0.8s 0.9s forwards;
}
.terminal-bar { display: flex; gap: 8px; margin-bottom: 16px; }
.terminal-dot { width: 10px; height: 10px; border-radius: 50%; }
.terminal-line { color: var(--muted); line-height: 2; }
.terminal-line .hl { color: var(--accent); }
.terminal-line .hl2 { color: var(--accent2); }
.terminal-line .hl3 { color: var(--accent3); }
.blink {
  display: inline-block; width: 8px; height: 14px;
  background: var(--accent); animation: blink 1s step-end infinite;
  vertical-align: middle;
}

/* ===== ABOUT ===== */
.about-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 48px; align-items: start; }
.about-text p { font-family: var(--mono); font-size: 0.9rem; color: var(--muted); line-height: 1.9; margin-bottom: 24px; }
.about-text p strong { color: var(--text); }
.skills-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.skill-card { background: var(--bg2); border: 1px solid var(--border); padding: 16px 20px; transition: border-color 0.2s, transform 0.2s; }
.skill-card:hover { border-color: var(--accent); transform: translateY(-2px); }
.skill-name { font-family: var(--mono); font-size: 0.78rem; color: var(--accent); margin-bottom: 6px; }
.skill-bar-wrap { height: 3px; background: var(--border); border-radius: 2px; overflow: hidden; }
.skill-bar { height: 100%; background: linear-gradient(90deg, var(--accent), var(--accent2)); border-radius: 2px; }
.skill-level { font-family: var(--mono); font-size: 0.65rem; color: var(--muted); margin-top: 6px; }

/* ===== CARDS GRID (blog & portfolio) ===== */
.cards-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(340px, 1fr)); gap: 24px; }
.card {
  background: var(--bg2); border: 1px solid var(--border);
  padding: 32px; transition: border-color 0.25s, transform 0.25s;
  position: relative; overflow: hidden; display: flex; flex-direction: column;
}
.card::before {
  content: ''; position: absolute; top: 0; left: 0; right: 0; height: 2px;
  background: linear-gradient(90deg, var(--accent), var(--accent2));
  transform: scaleX(0); transition: transform 0.3s; transform-origin: left;
}
.card:hover::before { transform: scaleX(1); }
.card:hover { border-color: var(--accent); transform: translateY(-4px); }
.card-meta { display: flex; align-items: center; gap: 12px; margin-bottom: 16px; flex-wrap: wrap; }
.card-tag {
  font-family: var(--mono); font-size: 0.65rem; letter-spacing: 0.15em;
  text-transform: uppercase; padding: 4px 10px;
  border: 1px solid var(--accent); color: var(--accent);
}
.card-tag.ai { border-color: var(--accent2); color: var(--accent2); }
.card-tag.data { border-color: var(--accent3); color: var(--accent3); }
.card-date { font-family: var(--mono); font-size: 0.7rem; color: var(--muted); }
.card-title { font-size: 1.2rem; font-weight: 700; letter-spacing: -0.02em; margin-bottom: 12px; line-height: 1.3; }
.card-excerpt { font-family: var(--mono); font-size: 0.8rem; color: var(--muted); line-height: 1.7; margin-bottom: 24px; flex-grow: 1; }
.card-footer { display: flex; align-items: center; justify-content: space-between; margin-top: auto; }
.card-read { font-family: var(--mono); font-size: 0.72rem; color: var(--accent); text-decoration: none; letter-spacing: 0.1em; text-transform: uppercase; cursor: pointer; background: none; border: none; }
.card-tags-row { display: flex; gap: 8px; flex-wrap: wrap; margin-top: 16px; }
.tech-chip { font-family: var(--mono); font-size: 0.62rem; color: var(--muted); border: 1px solid var(--border); padding: 3px 8px; border-radius: 3px; }
.card-links { display: flex; gap: 16px; margin-top: 16px; }
.card-links a { font-family: var(--mono); font-size: 0.72rem; color: var(--accent); text-decoration: none; }
.card-links a:hover { text-decoration: underline; }

.empty-state { text-align: center; padding: 80px 24px; border: 1px dashed var(--border); grid-column: 1 / -1; }
.empty-state p { font-family: var(--mono); color: var(--muted); font-size: 0.88rem; line-height: 1.8; }

/* ===== FILTERS ===== */
.filters { display: flex; gap: 12px; margin-bottom: 40px; flex-wrap: wrap; }
.filter-btn {
  font-family: var(--mono); font-size: 0.72rem; letter-spacing: 0.1em;
  text-transform: uppercase; padding: 8px 16px;
  background: transparent; border: 1px solid var(--border); color: var(--muted);
  cursor: pointer; transition: all 0.2s;
}
.filter-btn:hover { border-color: var(--muted); color: var(--text); }
.filter-btn.active { border-color: var(--accent); color: var(--accent); }

/* ===== ARTICLE PAGE ===== */
.article-wrap { max-width: 760px; margin: 0 auto; }
.article-back { font-family: var(--mono); font-size: 0.78rem; color: var(--muted); text-decoration: none; letter-spacing: 0.1em; text-transform: uppercase; margin-bottom: 48px; display: inline-block; transition: color 0.2s; }
.article-back:hover { color: var(--accent); }
.article-title { font-size: clamp(2rem, 5vw, 3.2rem); font-weight: 800; letter-spacing: -0.03em; line-height: 1.1; margin: 24px 0 48px; }
.article-body { font-family: var(--mono); font-size: 0.92rem; color: var(--muted); line-height: 2; white-space: pre-wrap; }
.article-body h2, .article-body h3 { font-family: var(--sans); color: var(--text); font-weight: 700; margin: 40px 0 16px; }

/* ===== MODAL ===== */
.modal-overlay {
  display: none; position: fixed; inset: 0;
  background: rgba(8,12,16,0.92); backdrop-filter: blur(8px);
  z-index: 200; align-items: center; justify-content: center; padding: 24px;
}
.modal-overlay.open { display: flex; }
.modal { background: var(--bg2); border: 1px solid var(--border); padding: 40px; width: 100%; max-width: 680px; max-height: 90vh; overflow-y: auto; }
.modal-title { font-family: var(--mono); font-size: 0.72rem; color: var(--accent); letter-spacing: 0.2em; text-transform: uppercase; margin-bottom: 8px; }
.modal h2 { font-size: 1.8rem; font-weight: 800; margin-bottom: 32px; }
.form-group { margin-bottom: 24px; }
.form-group label { display: block; font-family: var(--mono); font-size: 0.72rem; color: var(--muted); letter-spacing: 0.1em; text-transform: uppercase; margin-bottom: 10px; }
.form-group input, .form-group select, .form-group textarea {
  width: 100%; background: var(--bg3); border: 1px solid var(--border); color: var(--text);
  padding: 14px 16px; font-family: var(--mono); font-size: 0.88rem; outline: none;
  transition: border-color 0.2s; resize: vertical;
}
.form-group input:focus, .form-group select:focus, .form-group textarea:focus { border-color: var(--accent); }
.form-group select option { background: var(--bg2); }
.modal-actions { display: flex; gap: 12px; justify-content: flex-end; margin-top: 32px; }
.generating-indicator { display: none; align-items: center; gap: 12px; font-family: var(--mono); font-size: 0.82rem; color: var(--accent); margin-top: 20px; }
.generating-indicator.visible { display: flex; }
.spinner { width: 16px; height: 16px; border: 2px solid var(--border); border-top-color: var(--accent); border-radius: 50%; animation: spin 0.8s linear infinite; }

/* ===== ADMIN ===== */
.admin-lock { max-width: 420px; margin: 0 auto; text-align: center; }
.admin-card { background: var(--bg2); border: 1px solid var(--border); padding: 32px; margin-bottom: 24px; }
.admin-bar { display: flex; gap: 12px; justify-content: space-between; align-items: center; margin-bottom: 32px; flex-wrap: wrap; }
.admin-list-item { background: var(--bg2); border: 1px solid var(--border); padding: 20px; margin-bottom: 12px; display: flex; justify-content: space-between; align-items: center; gap: 16px; }
.admin-list-item h4 { font-size: 0.95rem; margin-bottom: 4px; }
.admin-list-item .meta { font-family: var(--mono); font-size: 0.7rem; color: var(--muted); }
.admin-actions { display: flex; gap: 8px; }
.icon-btn { background: none; border: 1px solid var(--border); color: var(--muted); padding: 6px 12px; font-family: var(--mono); font-size: 0.7rem; cursor: pointer; transition: all 0.2s; }
.icon-btn:hover { border-color: var(--accent); color: var(--accent); }
.icon-btn.danger:hover { border-color: var(--danger); color: var(--danger); }
.tabs { display: flex; gap: 0; margin-bottom: 32px; border-bottom: 1px solid var(--border); }
.tab { font-family: var(--mono); font-size: 0.8rem; text-transform: uppercase; letter-spacing: 0.1em; padding: 14px 24px; background: none; border: none; border-bottom: 2px solid transparent; color: var(--muted); cursor: pointer; transition: all 0.2s; }
.tab.active { color: var(--accent); border-bottom-color: var(--accent); }
.note { font-family: var(--mono); font-size: 0.72rem; color: var(--muted); line-height: 1.7; }
.note strong { color: var(--accent3); }

/* ===== FOOTER ===== */
footer {
  position: relative; z-index: 1; border-top: 1px solid var(--border);
  padding: 40px 48px; display: flex; align-items: center; justify-content: space-between;
  max-width: var(--maxw); margin: 60px auto 0;
}
.footer-copy { font-family: var(--mono); font-size: 0.75rem; color: var(--muted); }
.footer-copy span { color: var(--accent); }
.footer-social { display: flex; gap: 20px; }
.footer-social a { font-family: var(--mono); font-size: 0.75rem; color: var(--muted); text-decoration: none; transition: color 0.2s; }
.footer-social a:hover { color: var(--accent); }

/* ===== ANIMATIONS ===== */
@keyframes fadeUp { from { opacity: 0; transform: translateY(24px); } to { opacity: 1; transform: translateY(0); } }
@keyframes blink { 0%,100% { opacity: 1; } 50% { opacity: 0; } }
@keyframes spin { to { transform: rotate(360deg); } }

.reveal { opacity: 0; transform: translateY(24px); transition: opacity 0.6s, transform 0.6s; }
.reveal.in { opacity: 1; transform: translateY(0); }

/* ===== RESPONSIVE ===== */
@media (max-width: 900px) { .terminal-deco { display: none; } }
@media (max-width: 768px) {
  nav { padding: 16px 24px; }
  .nav-links {
    position: fixed; top: 60px; right: 0; bottom: 0; width: 70%;
    background: var(--bg2); border-left: 1px solid var(--border);
    flex-direction: column; padding: 40px 32px; gap: 28px;
    transform: translateX(100%); transition: transform 0.3s;
  }
  .nav-links.open { transform: translateX(0); }
  .nav-toggle { display: block; }
  .container { padding: 0 24px; }
  .about-grid { grid-template-columns: 1fr; }
  .hero-stats { gap: 24px; flex-wrap: wrap; }
  footer { flex-direction: column; gap: 16px; padding: 32px 24px; }
}