/* =============================================
   BASE.CSS — Shared across all pages
   ============================================= */

/* =============================================
   DESIGN TOKENS
   ============================================= */

:root {
  /* --- Brand --- */
  --color-brand:          #2563eb;
  --color-brand-hover:    #1d4ed8;
  --color-brand-muted:    #60a5fa;   /* used in mobile nav hover */

  /* --- Background layers --- */
  --color-bg:             #ffffff;
  --color-bg-alt:         #f8fafc;
  --color-bg-card:        #f9fafb;
  --color-bg-navbar:      rgba(255, 255, 255, 0.88);
  --color-bg-mobile-menu: rgba(15, 23, 42, 0.97);

  /* --- Text --- */
  --color-text:           #111827;
  --color-text-nav:       inherit;   /* inherits from body */
  --color-text-mobile:    #f8fafc;

  /* --- Borders --- */
  --color-border:         #e5e7eb;
  --color-border-btn:     #cbd5e1;

  /* --- Tags: Blue --- */
  --color-tag-blue-bg:    #eff6ff;
  --color-tag-blue-text:  #1d4ed8;

  /* --- Tags: Green --- */
  --color-tag-green-bg:   #f0fdf4;
  --color-tag-green-text: #15803d;

  /* --- Tags: Gray --- */
  --color-tag-gray-bg:    #f1f5f9;
  --color-tag-gray-text:  #64748b;

  /* --- Misc --- */
  --color-progress-bar:   #2563eb;   /* intentionally same as brand */
  --color-footer-link:    #2563eb;
  --color-eyebrow:        #2563eb;
}

/* --- Dark mode overrides --- */
body.dark {
  --color-bg:             #0f172a;
  --color-bg-alt:         #0a1628;
  --color-bg-card:        #1a2744;
  --color-bg-navbar:      rgba(15, 23, 42, 0.9);

  --color-text:           #e2e8f0;

  --color-border:         #1e293b;
  --color-border-card:    #2d3f5a;
  --color-border-btn:     #4a6080;
  --color-border-btn-hover: #60a5fa;

  --color-tag-blue-bg:    #1e3a5f;
  --color-tag-blue-text:  #93c5fd;

  --color-tag-green-bg:   #14532d30;
  --color-tag-green-text: #4ade80;

  --color-tag-gray-bg:    #334155;
  --color-tag-gray-text:  #94a3b8;
}


/* =============================================
   RESET
   ============================================= */

*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; font-size: 16px; }

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Arial, sans-serif;
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.7;
  transition: background 0.3s, color 0.3s;
  -webkit-font-smoothing: antialiased;
}

a { text-decoration: none; color: inherit; }
img { max-width: 100%; display: block; }


/* =============================================
   PROGRESS BAR
   ============================================= */

.progress-bar {
  position: fixed; top: 0; left: 0;
  height: 3px; width: 0%;
  background: var(--color-progress-bar);
  z-index: 9999;
  transition: width 0.1s linear;
}


/* =============================================
   NAVBAR
   ============================================= */

.navbar {
  width: 100%; padding: 18px 0;
  display: flex; align-items: center; gap: 32px;
  position: sticky; top: 0;
  backdrop-filter: blur(14px) saturate(1.4);
  background: var(--color-bg-navbar);
  z-index: 1000;
  border-bottom: 1px solid var(--color-border);
  padding-left: max(8%, 24px);
  padding-right: max(8%, 24px);
}

.logo {
  display: block;
  width: 120px;   /* adjust to taste */
  height: 52px;
  font-size: 20px; font-weight: 800;
  letter-spacing: 2px; color: inherit;
  flex-shrink: 0;
  overflow: hidden;
  line-height: 52px; /* vertically centres fallback text */
}
.logo:hover { color: var(--color-brand); }

nav { display: flex; gap: 28px; align-items: center; margin-left: auto; }

.nav-link {
  font-size: 14px; font-weight: 500;
  color: inherit; opacity: 0.65;
  transition: opacity 0.2s, color 0.2s;
  white-space: nowrap;
}
.nav-link:hover,
.nav-link.active { opacity: 1; color: var(--color-brand); }

.theme-toggle {
  border: none; background: none;
  cursor: pointer; font-size: 20px;
  padding: 4px; flex-shrink: 0;
}

.nav-hamburger {
  display: none; border: none; background: none;
  cursor: pointer; font-size: 22px;
  padding: 4px; flex-shrink: 0;
  color: var(--color-text);
}


/* =============================================
   MOBILE MENU
   ============================================= */

.mobile-menu {
  display: none;
  position: fixed; top: 0; left: 0; right: 0; bottom: 0;
  background: var(--color-bg-mobile-menu);
  z-index: 999; flex-direction: column;
  align-items: center; justify-content: center;
  gap: 32px;
}
.mobile-menu.open { display: flex; }

.mobile-menu .nav-link {
  font-size: 24px;
  color: var(--color-text-mobile);
  opacity: 0.85; font-weight: 600;
}
.mobile-menu .nav-link:hover,
.mobile-menu .nav-link.active { opacity: 1; color: var(--color-brand-muted); }


/* =============================================
   LAYOUT HELPERS
   ============================================= */

.section-inner,
.footer-inner,
.hero-inner,
.blog-hero-inner,
.blog-inner,
.contact-hero-inner,
.contact-section-inner,
.resume-container {
  max-width: 1100px;
  margin: 0 auto;
  padding-left: max(8%, 24px);
  padding-right: max(8%, 24px);
}

.section { padding: 90px 0; }

.section-alt { background: var(--color-bg-alt); }

.section-eyebrow {
  font-size: 12px; letter-spacing: 3px;
  font-weight: 700;
  color: var(--color-eyebrow);
  opacity: 0.85; margin-bottom: 10px;
}

.section-header { margin-bottom: 48px; }
.section-header h2 {
  font-size: 38px; font-weight: 800; line-height: 1.15;
  color: var(--color-text);
}


/* =============================================
   CARD
   ============================================= */

.card {
  padding: 36px 40px;
  border: 1px solid var(--color-border);
  border-radius: 18px;
  background: var(--color-bg-card);
}
body.dark .card { border-color: var(--color-border-card); }


/* =============================================
   TAGS
   ============================================= */

/* shared tag base */
.tag,
.tag-blue,
.tag-green,
.tag-gray {
  display: inline-block;
  border-radius: 20px;
  font-weight: 600;
}

.tag {
  font-size: 12px; padding: 4px 12px;
  background: var(--color-tag-blue-bg);
  color: var(--color-tag-blue-text);
}

.tag-blue {
  font-size: 11px; padding: 3px 10px;
  background: var(--color-tag-blue-bg);
  color: var(--color-tag-blue-text);
}

.tag-green {
  font-size: 11px; padding: 3px 10px;
  background: var(--color-tag-green-bg);
  color: var(--color-tag-green-text);
}

.tag-gray {
  font-size: 11px; padding: 3px 10px;
  background: var(--color-tag-gray-bg);
  color: var(--color-tag-gray-text);
}


/* =============================================
   BUTTONS
   ============================================= */

.primary-btn {
  display: inline-block;
  padding: 14px 28px; border-radius: 10px;
  background: var(--color-brand);
  color: #fff;
  font-size: 15px; font-weight: 600;
  border: none; cursor: pointer;
  transition: background 0.2s, transform 0.2s;
}
.primary-btn:hover { background: var(--color-brand-hover); transform: translateY(-2px); }

.secondary-btn {
  display: inline-block;
  padding: 14px 28px; border-radius: 10px;
  border: 1.5px solid var(--color-border-btn);
  font-size: 15px; font-weight: 600;
  background: transparent; color: inherit;
  cursor: pointer;
  transition: border-color 0.2s, transform 0.2s;
}
.secondary-btn:hover { border-color: var(--color-brand); transform: translateY(-2px); }
body.dark .secondary-btn { border-color: var(--color-border-btn); }
body.dark .secondary-btn:hover { border-color: var(--color-border-btn-hover); }


/* =============================================
   FOOTER
   ============================================= */

.footer {
  padding: 40px 0;
  border-top: 1px solid var(--color-border);
  text-align: center;
}

.footer-inner {
  display: flex; flex-direction: column;
  align-items: center; gap: 8px;
}
.footer p { font-size: 14px; opacity: 0.7; color: var(--color-text); }
.footer a { color: var(--color-footer-link); font-weight: 500; }
.footer a:hover { text-decoration: underline; }
.footer-note { font-size: 12px; opacity: 0.5; }


/* =============================================
   RESPONSIVE
   ============================================= */

@media (max-width: 768px) {
  nav { display: none; }
  .nav-hamburger { display: block; }
  .section { padding: 64px 0; }
  .theme-toggle { margin-left: auto; } 
  .section-header h2 { font-size: 28px; }
}

@media (max-width: 480px) {
  .section { padding: 48px 0; }
}