/* ============================================================
   styles.css - All component and layout styles
   No inline styles. No media queries (see responsive.css).
   Variables in variables.css.
   ============================================================ */

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--font-sans);
  background: var(--bg-page);
  color: var(--text-primary);
  line-height: 1.7;
}

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

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

ul[role="list"] {
  list-style: none;
}

/* ── Accessibility: Skip Link ──────────────────────────────── */
.skip-link {
  position: absolute;
  top: -100%;
  left: 1rem;
  background: var(--primary);
  color: var(--white);
  padding: 0.5rem 1rem;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  font-weight: 600;
  z-index: 9999;
  transition: top 0.2s;
}

.skip-link:focus {
  top: 1rem;
}

/* ── Layout: Section Container ─────────────────────────────── */
.section-container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: var(--section-gap) 2rem;
}

.section-label {
  display: block;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--primary);
  margin-bottom: 0.5rem;
}

.section-title {
  font-size: 2rem;
  font-weight: 800;
  color: var(--text-primary);
  letter-spacing: -0.03em;
  margin-bottom: 0.5rem;
}

.section-sub {
  font-size: 1rem;
  color: var(--text-secondary);
  margin-bottom: 2.5rem;
  max-width: 600px;
}

.divider {
  width: 48px;
  height: 4px;
  background: var(--primary);
  border-radius: 2px;
  margin: 0.75rem 0 2rem;
}

/* ── Navigation ────────────────────────────────────────────── */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(255, 255, 255, 0.96);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border-color);
  height: var(--nav-height);
}

.nav-container {
  max-width: calc(var(--max-width) + 4rem);
  margin: 0 auto;
  padding: 0 2rem;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  position: relative;
}

.nav-brand {
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--text-primary);
  letter-spacing: -0.02em;
  transition: var(--transition);
}

.nav-brand span {
  color: var(--primary);
}

.nav-brand:hover {
  opacity: 0.8;
}

.nav-links {
  display: flex;
  gap: 0.25rem;
  list-style: none;
}

.nav-link {
  display: block;
  padding: 0.4rem 0.85rem;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-secondary);
  transition: var(--transition);
}

.nav-link:hover,
.nav-link.is-active {
  background: var(--light);
  color: var(--primary);
}

.nav-link.nav-cta {
  background: var(--primary);
  color: var(--white);
}

.nav-link.nav-cta:hover {
  background: var(--primary-dark);
}

/* Hamburger button - hidden on desktop */
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.5rem;
  border-radius: var(--radius-sm);
  transition: var(--transition);
}

.nav-toggle:hover {
  background: var(--light);
}

.hamburger-line {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: var(--transition);
}

.nav-toggle[aria-expanded="true"] .hamburger-line:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.nav-toggle[aria-expanded="true"] .hamburger-line:nth-child(2) {
  opacity: 0;
}

.nav-toggle[aria-expanded="true"] .hamburger-line:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* ── Buttons ───────────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.7rem 1.4rem;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
  border: 2px solid transparent;
  font-family: var(--font-sans);
  text-decoration: none;
}

.btn-primary {
  background: var(--primary);
  color: var(--white);
}

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

.btn-outline {
  border-color: var(--border-color);
  color: var(--text-secondary);
  background: var(--bg-surface);
}

.btn-outline:hover {
  border-color: var(--primary);
  color: var(--primary);
  transform: translateY(-1px);
}

/* ── Hero / Home Section ───────────────────────────────────── */
.section-home {
  background: var(--bg-page);
}

.section-home .section-container {
  padding-top: calc(var(--nav-height) + 5rem);
  padding-bottom: 5rem;
}

.status-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--green);
  background: var(--green-bg);
  padding: 0.25rem 0.65rem;
  border-radius: var(--radius-full);
  margin-bottom: 1.5rem;
}

.status-badge::before {
  content: "";
  width: 7px;
  height: 7px;
  background: var(--green);
  border-radius: 50%;
  flex-shrink: 0;
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50%       { opacity: 0.4; }
}

.hero-tag {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  background: var(--tag-bg);
  color: var(--tag-text);
  font-size: 0.8rem;
  font-weight: 600;
  padding: 0.3rem 0.75rem;
  border-radius: var(--radius-full);
  margin-bottom: 1.5rem;
  letter-spacing: 0.03em;
}

.hero-tag::before {
  content: "●";
  font-size: 0.6rem;
}

.hero-name {
  font-size: clamp(2.4rem, 5vw, 3.6rem);
  font-weight: 900;
  letter-spacing: -0.04em;
  color: var(--text-primary);
  line-height: 1.1;
  margin-bottom: 1.25rem;
}

.hero-name .highlight {
  color: var(--primary);
}

.hero-tagline {
  font-size: 1.15rem;
  color: var(--text-secondary);
  max-width: 620px;
  line-height: 1.75;
  margin-bottom: 2rem;
}

.hero-ctas {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
  margin-bottom: 3rem;
}

.hero-stats {
  display: flex;
  gap: 2.5rem;
  flex-wrap: wrap;
  padding-top: 2rem;
  border-top: 1px solid var(--border-color);
}

.stat-num {
  font-size: 1.6rem;
  font-weight: 800;
  color: var(--text-primary);
  letter-spacing: -0.03em;
}

.stat-label {
  font-size: 0.8rem;
  color: var(--slate-500);
  font-weight: 500;
}

/* ── Profile Section ───────────────────────────────────────── */
.section-profile {
  background: var(--bg-page);
}

.profile-card {
  background: var(--bg-surface);
  border-radius: var(--radius-2xl);
  border: 1px solid var(--border-color);
  overflow: hidden;
}

.profile-card-inner {
  padding: 3.5rem;
}

.profile-grid {
  display: grid;
  grid-template-columns: 200px 1fr;
  gap: 3rem;
  align-items: start;
}

.profile-photo-wrap {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1rem;
}

.profile-photo {
  width: 160px;
  height: 160px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--primary) 0%, var(--accent) 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 3.5rem;
  font-weight: 700;
  color: white;
  letter-spacing: -0.02em;
  flex-shrink: 0;
}

.profile-social {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  width: 100%;
}

.social-link {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  font-size: 0.8rem;
  color: var(--text-secondary);
  padding: 0.35rem 0.65rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-color);
  transition: var(--transition);
}

.social-link:hover {
  border-color: var(--primary);
  color: var(--primary);
  background: var(--tag-bg);
}

.social-icon {
  font-size: 1rem;
}

.bio-name {
  font-size: 1.6rem;
  font-weight: 800;
  color: var(--text-primary);
  letter-spacing: -0.03em;
  margin-bottom: 0.25rem;
}

.bio-role {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--primary);
  margin-bottom: 1.25rem;
}

.profile-bio p {
  color: var(--text-secondary);
  margin-bottom: 1rem;
  font-size: 0.97rem;
}

.profile-highlights {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.75rem;
  margin-top: 1.5rem;
}

.highlight-card {
  background: var(--light);
  border-radius: var(--radius-md);
  padding: 1rem 1.1rem;
}

.hc-title {
  font-size: 0.78rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--primary);
  margin-bottom: 0.3rem;
}

.hc-val {
  font-size: 0.88rem;
  color: var(--text-primary);
  font-weight: 500;
}

/* ── Skills Section ────────────────────────────────────────── */
.section-skills {
  background: var(--bg-page);
}

.skills-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
  margin-bottom: 2.5rem;
}

.skill-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
}

.skill-card-title {
  font-size: 0.85rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--primary);
  margin-bottom: 1rem;
}

.skill-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}

.tag {
  background: var(--tag-bg);
  color: var(--tag-text);
  font-size: 0.78rem;
  font-weight: 600;
  padding: 0.28rem 0.65rem;
  border-radius: 5px;
}

.tag-green  { background: var(--green-bg);    color: #15803d; }
.tag-purple { background: var(--purple-bg);   color: var(--purple-text); }
.tag-orange { background: var(--orange-bg);   color: var(--orange-text); }

/* Experience */
.resume-section-title {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-primary);
  margin: 2.5rem 0 1.25rem;
  padding-bottom: 0.6rem;
  border-bottom: 2px solid var(--border-color);
}

.exp-list {
  display: flex;
  flex-direction: column;
  gap: 1.75rem;
}

.exp-item {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.exp-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 1rem;
}

.exp-title {
  font-weight: 700;
  font-size: 0.97rem;
  color: var(--text-primary);
}

.exp-company {
  font-size: 0.88rem;
  color: var(--primary);
  font-weight: 600;
  margin-top: 0.1rem;
}

.exp-date {
  font-size: 0.8rem;
  color: var(--slate-500);
  font-weight: 500;
  white-space: nowrap;
  flex-shrink: 0;
}

.exp-bullets {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
}

.exp-bullets li {
  font-size: 0.88rem;
  color: var(--text-secondary);
  padding-left: 1.1rem;
  position: relative;
}

.exp-bullets li::before {
  content: "→";
  position: absolute;
  left: 0;
  color: var(--primary);
  font-size: 0.75rem;
  top: 0.35rem;
}

/* ── Work Samples Section ──────────────────────────────────── */
.section-work {
  background: var(--light);
}

.github-banner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: var(--dark);
  color: white;
  border-radius: var(--radius-lg);
  padding: 1.25rem 1.75rem;
  margin-bottom: 2rem;
}

.gb-left {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.gb-icon {
  font-size: 1.75rem;
}

.gb-title {
  font-size: 0.97rem;
  font-weight: 700;
  color: white;
}

.gb-sub {
  font-size: 0.8rem;
  color: var(--slate-400);
}

.gb-link {
  background: white;
  color: var(--dark);
  font-size: 0.82rem;
  font-weight: 700;
  padding: 0.5rem 1.1rem;
  border-radius: 7px;
  transition: var(--transition);
  white-space: nowrap;
}

.gb-link:hover {
  background: var(--tag-bg);
  color: var(--primary);
}

.projects-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.25rem;
}

.project-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  padding: 1.75rem;
  display: flex;
  flex-direction: column;
  transition: box-shadow 0.2s, transform 0.2s;
}

.project-card:hover {
  box-shadow: var(--shadow-card);
  transform: translateY(-2px);
}

.project-card.flagship {
  grid-column: 1 / -1;
  background: linear-gradient(135deg, #eff6ff 0%, #f0fdf4 100%);
  border-color: #bfdbfe;
}

.project-badges {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  margin-bottom: 1rem;
  flex-wrap: wrap;
}

.project-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.07em;
  padding: 0.25rem 0.65rem;
  border-radius: 5px;
}

.badge-flagship { background: var(--tag-bg);    color: #1d4ed8; }
.badge-cloud    { background: var(--green-bg);  color: #15803d; }
.badge-obs      { background: var(--purple-bg); color: var(--purple-text); }

.badge-status {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  font-size: 0.72rem;
  font-weight: 600;
  padding: 0.2rem 0.6rem;
  border-radius: var(--radius-full);
  background: var(--yellow-bg);
  color: var(--yellow-text);
}

.badge-status::before {
  content: "⏳";
}

.project-title {
  font-size: 1.05rem;
  font-weight: 800;
  color: var(--text-primary);
  margin-bottom: 0.4rem;
  letter-spacing: -0.02em;
}

.project-repo {
  font-size: 0.78rem;
  color: var(--slate-500);
  font-family: var(--font-mono);
  margin-bottom: 0.85rem;
}

.project-desc {
  font-size: 0.88rem;
  color: var(--text-secondary);
  margin-bottom: 1rem;
  line-height: 1.65;
  flex: 1;
}

.project-arch {
  background: rgba(15, 23, 42, 0.04);
  border-radius: var(--radius-sm);
  padding: 0.75rem 1rem;
  font-size: 0.8rem;
  color: var(--text-secondary);
  margin-bottom: 1rem;
  font-family: var(--font-mono);
  overflow-x: auto;
}

.project-problem {
  font-size: 0.82rem;
  color: var(--text-secondary);
  margin-bottom: 0.75rem;
  line-height: 1.6;
}

.project-problem strong {
  color: var(--text-primary);
}

.project-stack {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
  margin-top: auto;
}

.stack-tag {
  background: var(--light);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  font-size: 0.72rem;
  font-weight: 600;
  padding: 0.2rem 0.55rem;
  border-radius: 5px;
}

.project-link {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--primary);
  margin-top: 1.1rem;
  transition: gap 0.2s;
}

.project-link:hover {
  gap: 0.65rem;
}

/* ── Education Section ─────────────────────────────────────── */
.section-education {
  background: var(--bg-page);
}

.edu-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.25rem;
}

.edu-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
}

.edu-card.full-width {
  grid-column: 1 / -1;
}

.edu-icon {
  font-size: 1.75rem;
  margin-bottom: 0.75rem;
}

.edu-title {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 0.2rem;
}

.edu-inst {
  font-size: 0.85rem;
  color: var(--primary);
  font-weight: 600;
  margin-bottom: 0.2rem;
}

.edu-date {
  font-size: 0.78rem;
  color: var(--slate-500);
  margin-bottom: 0.75rem;
}

.edu-desc {
  font-size: 0.85rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

.cert-list {
  list-style: none;
  margin-top: 0.75rem;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.cert-list li {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-size: 0.85rem;
  color: var(--text-secondary);
}

.cert-list li::before {
  content: "✓";
  min-width: 18px;
  height: 18px;
  background: var(--green-bg);
  color: #15803d;
  border-radius: 50%;
  font-size: 0.65rem;
  font-weight: 900;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.placeholder-note {
  font-size: 0.78rem;
  color: var(--slate-400);
  font-style: italic;
  margin-top: 0.75rem;
}

/* ── Contact Section ───────────────────────────────────────── */
.section-contact {
  background: var(--dark);
}

.section-contact .section-label {
  color: var(--accent);
}

.section-contact .section-title {
  color: var(--white);
}

.section-contact .section-sub {
  color: var(--slate-400);
}

.section-contact .divider {
  margin-left: 0;
}

.contact-inner {
  text-align: center;
}

.contact-inner .section-label,
.contact-inner .section-title,
.contact-inner .section-sub,
.contact-inner .divider {
  margin-left: auto;
  margin-right: auto;
}

.contact-cards {
  display: flex;
  justify-content: center;
  gap: 1rem;
  flex-wrap: wrap;
  margin-bottom: 3rem;
}

.contact-card {
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-lg);
  padding: 1.25rem 2rem;
  color: white;
  transition: var(--transition);
  min-width: 180px;
  text-align: center;
}

.contact-card:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: rgba(255, 255, 255, 0.2);
  transform: translateY(-2px);
}

.cc-icon {
  font-size: 1.5rem;
  margin-bottom: 0.5rem;
}

.cc-label {
  font-size: 0.75rem;
  color: var(--slate-500);
  text-transform: uppercase;
  letter-spacing: 0.07em;
  font-weight: 600;
  margin-bottom: 0.25rem;
}

.cc-value {
  font-size: 0.88rem;
  font-weight: 600;
  color: white;
}

/* ── Back to Top Button ────────────────────────────────────── */
.back-to-top {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  background: none;
  border: none;
  color: var(--slate-500);
  font-size: 0.85rem;
  font-family: var(--font-sans);
  cursor: pointer;
  transition: color 0.2s;
  padding: 0.5rem;
  border-radius: var(--radius-sm);
}

.back-to-top:hover {
  color: white;
}

/* ── Footer ────────────────────────────────────────────────── */
.site-footer {
  background: #060b18;
  padding: 1.5rem 2rem;
  text-align: center;
  font-size: 0.8rem;
  color: #475569;
  border-top: 1px solid rgba(255, 255, 255, 0.05);
}