/* =============================================
   GLOBAL STYLES — Saad Megahed Portfolio
   ============================================= */

:root {
  --bg: #0e0e0e;
  --bg2: #151515;
  --bg3: #1c1c1c;
  --text: #e8e4dc;
  --text-muted: #888;
  --accent: #c8a96e;
  --accent2: #7eb8c8;
  --border: rgba(200,169,110,0.18);
  --font-display: 'Cormorant Garamond', Georgia, serif;
  --font-mono: 'DM Mono', monospace;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-display);
  font-size: 18px;
  line-height: 1.7;
  min-height: 100vh;
}

a { color: var(--accent); text-decoration: none; transition: opacity 0.2s; }
a:hover { opacity: 0.75; }

/* ——— NAV ——— */
.navbar {
  position: fixed; top: 0; left: 0; width: 100%; z-index: 100;
  display: flex; align-items: center; justify-content: space-between;
  padding: 1.1rem 3rem;
  background: rgba(14,14,14,0.88);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}
.nav-logo {
  font-family: var(--font-mono);
  font-size: 1rem;
  color: var(--accent);
  letter-spacing: 0.15em;
}
.nav-links { display: flex; gap: 2.2rem; list-style: none; }
.nav-links a {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-muted);
  transition: color 0.2s;
}
.nav-links a:hover, .nav-links a.active { color: var(--accent); opacity: 1; }
.hamburger { display: none; cursor: pointer; font-size: 1.4rem; color: var(--text); }

/* ——— HERO ——— */
.hero {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 8rem 3rem 4rem;
  position: relative;
  overflow: hidden;
}
.hero-bg {
  position: absolute; inset: 0; z-index: 0;
  background:
    radial-gradient(ellipse 60% 60% at 80% 30%, rgba(200,169,110,0.07) 0%, transparent 70%),
    radial-gradient(ellipse 40% 50% at 10% 80%, rgba(126,184,200,0.06) 0%, transparent 70%);
}
.hero-bg::after {
  content: '';
  position: absolute; inset: 0;
  background-image: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Ccircle cx='30' cy='30' r='0.5' fill='%23c8a96e' fill-opacity='0.12'/%3E%3C/svg%3E");
  background-size: 60px 60px;
}
.hero-content { position: relative; z-index: 1; max-width: 700px; }
.hero-label {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 1.2rem;
}
.hero-name {
  font-size: clamp(3.5rem, 8vw, 7rem);
  font-weight: 300;
  line-height: 1;
  margin-bottom: 1.5rem;
  color: var(--text);
}
.hero-name em { color: var(--accent); font-style: italic; }
.hero-desc {
  font-size: 1.15rem;
  color: rgba(232,228,220,0.7);
  max-width: 520px;
  margin-bottom: 2.5rem;
}
.hero-desc strong { color: var(--text); }
.hero-links { display: flex; gap: 1rem; flex-wrap: wrap; }
/* ——— HERO PHOTO ——— */
.hero-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 4rem;
  position: relative;
  z-index: 1;
  max-width: 1000px;
}

.hero-photo-wrap {
  flex-shrink: 0;
  position: relative;
}

.hero-photo-wrap::before {
  content: '';
  position: absolute;
  inset: -8px;
  border: 1px solid var(--accent);
  opacity: 0.35;
  pointer-events: none;
}

.hero-photo-wrap::after {
  content: '';
  position: absolute;
  bottom: -12px;
  right: -12px;
  width: 100%;
  height: 100%;
  border: 1px solid var(--accent2);
  opacity: 0.2;
  pointer-events: none;
}

.hero-photo {
  width: 300px;
  height: 360px;
  object-fit: cover;
  object-position: center top;
  display: block;
  filter: grayscale(20%) contrast(1.05);
}

@media (max-width: 768px) {
  .hero-inner {
    flex-direction: column-reverse;
    gap: 2rem;
  }
  .hero-photo {
    width: 280px;
    height: 340px;
  }
}
.btn-primary {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  padding: 0.75rem 2rem;
  background: var(--accent);
  color: #0e0e0e;
  border: 1px solid var(--accent);
  transition: background 0.2s, color 0.2s;
}
.btn-primary:hover { background: transparent; color: var(--accent); opacity: 1; }
.btn-ghost {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  padding: 0.75rem 2rem;
  background: transparent;
  color: var(--text-muted);
  border: 1px solid var(--border);
  transition: border-color 0.2s, color 0.2s;
}
.btn-ghost:hover { border-color: var(--accent); color: var(--accent); opacity: 1; }
.hero-stats {
  display: flex; gap: 3rem; margin-top: 4rem;
  position: relative; z-index: 1;
}
.stat { display: flex; flex-direction: column; }
.stat-num {
  font-size: 2.2rem;
  font-weight: 300;
  color: var(--accent);
  line-height: 1;
}
.stat-label {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-top: 0.3rem;
}

/* ——— SECTIONS ——— */
.container { max-width: 1000px; margin: 0 auto; padding: 0 2rem; }
.section-title {
  font-size: clamp(2rem, 4vw, 2.8rem);
  font-weight: 300;
  color: var(--text);
  margin-bottom: 2.5rem;
  position: relative;
}
.section-title::after {
  content: '';
  display: block;
  width: 3rem;
  height: 1px;
  background: var(--accent);
  margin-top: 0.6rem;
}

.section-about { padding: 6rem 0; }
.about-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 4rem; align-items: start; }
.about-text p { color: rgba(232,228,220,0.75); margin-bottom: 1rem; }
.about-text em { color: var(--accent); font-style: italic; }
.about-text strong { color: var(--text); }
.about-cards { display: flex; flex-direction: column; gap: 1.2rem; }
.card {
  padding: 1.5rem;
  border: 1px solid var(--border);
  background: var(--bg2);
  transition: border-color 0.2s, transform 0.2s;
}
.card:hover { border-color: var(--accent); transform: translateX(4px); }
.card-icon { font-size: 1.4rem; color: var(--accent); display: block; margin-bottom: 0.5rem; }
.card h3 { font-size: 1.1rem; font-weight: 400; margin-bottom: 0.3rem; }
.card p { font-size: 0.88rem; color: var(--text-muted); }

.section-highlights { padding: 4rem 0 6rem; }
.highlights-list { display: flex; flex-direction: column; gap: 0; }
.highlight-item {
  display: grid; grid-template-columns: 5rem 1fr;
  gap: 2rem; align-items: start;
  padding: 1.5rem 0;
  border-bottom: 1px solid var(--border);
}
.hl-year {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--accent);
  letter-spacing: 0.08em;
  padding-top: 0.25rem;
}
.hl-content h4 { font-size: 1.05rem; font-weight: 400; margin-bottom: 0.2rem; }
.hl-content p { font-size: 0.9rem; color: var(--text-muted); }

/* ——— PAGE HEADER ——— */
.page-header {
  padding: 9rem 3rem 3rem;
  border-bottom: 1px solid var(--border);
  background: var(--bg2);
}
.page-header .hero-label { margin-bottom: 0.8rem; }
.page-header h1 {
  font-size: clamp(2.5rem, 6vw, 4.5rem);
  font-weight: 300;
  line-height: 1.1;
}
.page-header h1 em { color: var(--accent); font-style: italic; }

/* ——— CV PAGE ——— */
.cv-section { padding: 5rem 0; }
.cv-block { margin-bottom: 3.5rem; }
.cv-block-title {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 1.5rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--border);
}
.cv-entry {
  display: grid; grid-template-columns: 160px 1fr;
  gap: 1.5rem; padding: 1.2rem 0;
  border-bottom: 1px solid rgba(200,169,110,0.07);
}
.cv-date {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-muted);
  padding-top: 0.2rem;
  line-height: 1.5;
}
.cv-details h3 { font-size: 1.05rem; font-weight: 400; margin-bottom: 0.25rem; }
.cv-details h3 em { color: var(--accent); font-style: italic; font-weight: 300; }
.cv-details .cv-sub {
  font-size: 0.88rem; color: var(--text-muted); margin-bottom: 0.5rem;
}
.cv-details ul { padding-left: 1.2rem; }
.cv-details ul li {
  font-size: 0.88rem; color: rgba(232,228,220,0.65);
  margin-bottom: 0.25rem;
}
.skills-grid { display: flex; flex-wrap: wrap; gap: 0.6rem; margin-top: 0.5rem; }
.skill-tag {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  padding: 0.3rem 0.8rem;
  border: 1px solid var(--border);
  color: var(--text-muted);
  letter-spacing: 0.05em;
}
.award-item {
  display: flex; align-items: baseline; gap: 1rem;
  padding: 0.8rem 0; border-bottom: 1px solid rgba(200,169,110,0.07);
}
.award-year {
  font-family: var(--font-mono); font-size: 0.72rem;
  color: var(--accent); min-width: 3rem;
}

/* ——— PUBLICATIONS PAGE ——— */
.pub-section { padding: 5rem 0; }
.pub-filter {
  display: flex; gap: 1rem; flex-wrap: wrap; margin-bottom: 3rem;
}
.filter-btn {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: 0.45rem 1.1rem;
  background: transparent;
  color: var(--text-muted);
  border: 1px solid var(--border);
  cursor: pointer;
  transition: all 0.2s;
}
.filter-btn:hover, .filter-btn.active { background: var(--accent); color: #0e0e0e; border-color: var(--accent); }
.pub-item {
  padding: 1.8rem 0;
  border-bottom: 1px solid var(--border);
  display: grid; grid-template-columns: 3rem 1fr;
  gap: 1.5rem; align-items: start;
}
.pub-num {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--accent);
  padding-top: 0.3rem;
}
.pub-title {
  font-size: 1.05rem; font-weight: 400; margin-bottom: 0.4rem; line-height: 1.4;
}
.pub-authors {
  font-size: 0.85rem; color: var(--text-muted); margin-bottom: 0.3rem;
}
.pub-authors strong { color: var(--text); }
.pub-journal {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--accent2);
}
.pub-badge {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.65rem;
  padding: 0.2rem 0.5rem;
  background: rgba(200,169,110,0.12);
  color: var(--accent);
  border: 1px solid rgba(200,169,110,0.3);
  margin-left: 0.5rem;
  vertical-align: middle;
}

/* ——— BLOG PAGE ——— */
.blog-section { padding: 5rem 0; }
.blog-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 2rem; }
.blog-card {
  border: 1px solid var(--border);
  background: var(--bg2);
  padding: 2rem;
  transition: border-color 0.2s, transform 0.2s;
}
.blog-card:hover { border-color: var(--accent); transform: translateY(-3px); }
.blog-tag {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 0.8rem;
}
.blog-card h3 { font-size: 1.2rem; font-weight: 400; margin-bottom: 0.6rem; line-height: 1.3; }
.blog-card p { font-size: 0.9rem; color: var(--text-muted); margin-bottom: 1.2rem; }
.blog-link {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent2);
}
.blog-note {
  margin-top: 3rem;
  padding: 2rem;
  border: 1px solid var(--border);
  background: var(--bg3);
  font-size: 0.95rem;
  color: var(--text-muted);
}
.blog-note a { color: var(--accent); }

/* ——— CONTACT PAGE ——— */
.contact-section { padding: 5rem 0; }
.contact-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 5rem; align-items: start; }
.contact-info h2 { font-size: 1.8rem; font-weight: 300; margin-bottom: 1.5rem; }
.contact-info p { color: var(--text-muted); margin-bottom: 2rem; font-size: 0.95rem; }
.contact-list { display: flex; flex-direction: column; gap: 1.2rem; }
.contact-row { display: flex; flex-direction: column; gap: 0.2rem; }
.contact-row .clabel {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-muted);
}
.contact-row a, .contact-row span {
  font-size: 1rem; color: var(--text);
}
.contact-row a:hover { color: var(--accent); opacity: 1; }
.contact-form { display: flex; flex-direction: column; gap: 1.2rem; }
.form-group { display: flex; flex-direction: column; gap: 0.4rem; }
.form-group label {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-muted);
}
.form-group input, .form-group textarea {
  background: var(--bg2);
  border: 1px solid var(--border);
  color: var(--text);
  font-family: var(--font-display);
  font-size: 1rem;
  padding: 0.75rem 1rem;
  outline: none;
  resize: vertical;
  transition: border-color 0.2s;
}
.form-group input:focus, .form-group textarea:focus { border-color: var(--accent); }
.form-group textarea { min-height: 140px; }
.refs-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: 1.5rem; margin-top: 1.5rem; }
.ref-card {
  border: 1px solid var(--border); background: var(--bg2); padding: 1.5rem;
}
.ref-card h4 { font-size: 1rem; font-weight: 400; margin-bottom: 0.3rem; }
.ref-card .ref-role { font-size: 0.83rem; color: var(--text-muted); margin-bottom: 0.6rem; }
.ref-card a { font-family: var(--font-mono); font-size: 0.75rem; color: var(--accent2); }

/* ——— FOOTER ——— */
.footer {
  padding: 2rem 3rem;
  border-top: 1px solid var(--border);
  text-align: center;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-muted);
}
.footer a { color: var(--text-muted); }
.footer a:hover { color: var(--accent); opacity: 1; }

/* ——— RESPONSIVE ——— */
@media (max-width: 768px) {
  .navbar { padding: 1rem 1.5rem; }
  .nav-links { display: none; flex-direction: column; position: absolute; top: 100%; left: 0; width: 100%; background: var(--bg); padding: 1rem 1.5rem 2rem; border-bottom: 1px solid var(--border); }
  .nav-links.open { display: flex; }
  .hamburger { display: block; }
  .hero { padding: 7rem 1.5rem 3rem; }
  .hero-stats { gap: 2rem; }
  .about-grid, .contact-grid { grid-template-columns: 1fr; gap: 2.5rem; }
  .cv-entry { grid-template-columns: 1fr; gap: 0.3rem; }
  .cv-date { font-size: 0.7rem; }
  .pub-item { grid-template-columns: 2rem 1fr; gap: 1rem; }
  .highlight-item { grid-template-columns: 4rem 1fr; gap: 1rem; }
  .container { padding: 0 1.5rem; }
  .page-header { padding: 7rem 1.5rem 2.5rem; }
}