/*
 * PORTFOLIO.CSS — Clean, Premium Design System
 * Built with Bootstrap 5 as foundation
 * Color system: Neutral white + slate accent + single blue highlight
 * Spacing: 8px grid system
 */

/* ── Google Fonts ── */
@import url('https://fonts.googleapis.com/css2?family=Inter:ital,opsz,wght@0,14..32,300;0,14..32,400;0,14..32,500;0,14..32,600;0,14..32,700;1,14..32,400&display=swap');

/* ────────────────────────────────────────────
   DESIGN TOKENS
──────────────────────────────────────────── */
:root {
  /* Colors */
  --color-bg:        #000000;
  --color-surface:   #0f0f0f;
  --color-surface-2: #1a1a1a;
  --color-border:    #2B2B2B;
  --color-border-2:  #404040;

  /* Text */
  --color-text:      #FAFAFA;
  --color-text-2:    #A3A3A3;
  --color-text-3:    #737373;

  /* Accent — used sparingly */
  --color-accent:    #3B82F6;
  --color-accent-dk: #60A5FA;

  /* Typography */
  --font:            'Inter', -apple-system, BlinkMacSystemFont, sans-serif;

  /* Spacing scale (8px base) */
  --sp-1: 8px;   --sp-2: 16px;  --sp-3: 24px;  --sp-4: 32px;
  --sp-5: 40px;  --sp-6: 56px;  --sp-7: 72px;  --sp-8: 96px;

  /* Radius */
  --r-sm: 6px;   --r-md: 10px;  --r-lg: 16px;

  /* Shadows — very subtle, no glow */
  --shadow-sm: 0 1px 3px rgba(0,0,0,.06), 0 1px 2px rgba(0,0,0,.04);
  --shadow-md: 0 4px 12px rgba(0,0,0,.08), 0 2px 4px rgba(0,0,0,.04);
  --shadow-lg: 0 12px 32px rgba(0,0,0,.10), 0 4px 8px rgba(0,0,0,.04);

  /* Transitions */
  --ease: 0.2s ease;
  --ease-md: 0.3s ease;
}

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

html  { scroll-behavior: smooth; font-size: 16px; }
body  {
  font-family: var(--font);
  background:  var(--color-bg);
  color:       var(--color-text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Typography overrides (Bootstrap defaults are fine, just refine) */
h1,h2,h3,h4,h5,h6 {
  font-family: var(--font);
  font-weight: 700;
  letter-spacing: -0.025em;
  line-height: 1.1;
  color: var(--color-text);
}

p { color: var(--color-text-2); line-height: 1.75; }
a { color: inherit; text-decoration: none; }
a:hover { color: inherit; }
img { display: block; max-width: 100%; }
::selection { background: rgba(26,86,219,.12); }
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--color-surface); }
::-webkit-scrollbar-thumb { background: var(--color-border-2); border-radius: 3px; }

/* ────────────────────────────────────────────
   LAYOUT SYSTEM
──────────────────────────────────────────── */
.pf-container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 var(--sp-4);
}

.section-block {
  padding: var(--sp-8) 0;
}
.section-block--alt {
  padding: var(--sp-8) 0;
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
}

/* Section header */
.section-eyebrow {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-text-3);
  margin-bottom: var(--sp-2);
}
.section-heading {
  font-size: clamp(1.75rem, 3.5vw, 2.5rem);
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.15;
  color: var(--color-text);
  margin-bottom: var(--sp-2);
}
.section-sub {
  font-size: 1.0625rem;
  color: var(--color-text-2);
  max-width: 540px;
  line-height: 1.7;
}

/* ────────────────────────────────────────────
   NAVBAR
──────────────────────────────────────────── */
.pf-navbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 1000;
  height: 64px;
  background: rgba(10,10,10,0.85);
  backdrop-filter: saturate(180%) blur(16px);
  -webkit-backdrop-filter: saturate(180%) blur(16px);
  border-bottom: 1px solid transparent;
  transition: border-color var(--ease-md);
}
.pf-navbar.scrolled {
  border-bottom-color: var(--color-border);
}
.pf-nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}
.pf-logo {
  font-size: 1.0625rem;
  font-weight: 700;
  color: var(--color-text);
  letter-spacing: -0.04em;
  display: flex;
  align-items: center;
  gap: 8px;
}
.pf-logo-dot {
  width: 6px;
  height: 6px;
  background: var(--color-accent);
  border-radius: 50%;
  display: inline-block;
}
.pf-nav-links {
  display: flex;
  align-items: center;
  gap: 4px;
  list-style: none;
}
.pf-nav-links a {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-text-2);
  padding: 6px 12px;
  border-radius: var(--r-sm);
  transition: color var(--ease), background var(--ease);
}
.pf-nav-links a:hover,
.pf-nav-links a.active {
  color: var(--color-text);
  background: var(--color-surface);
}
.pf-nav-cta {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--color-bg) !important;
  background: var(--color-text) !important;
  padding: 8px 18px !important;
  border-radius: var(--r-sm);
  transition: background var(--ease), transform var(--ease) !important;
}
.pf-nav-cta:hover {
  background: #E5E5E5 !important;
  transform: translateY(-1px);
}

/* Mobile toggle */
.pf-hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 8px;
  background: none;
  border: none;
}
.pf-hamburger span {
  display: block;
  width: 22px;
  height: 1.5px;
  background: var(--color-text);
  transition: all var(--ease-md);
}

/* Mobile nav drawer */
.pf-mobile-nav {
  display: none;
  position: fixed;
  top: 64px; left: 0; right: 0;
  background: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
  padding: var(--sp-2) var(--sp-4) var(--sp-3);
  z-index: 999;
}
.pf-mobile-nav.open { display: block; }
.pf-mobile-nav a {
  display: block;
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--color-text-2);
  padding: 10px 0;
  border-bottom: 1px solid var(--color-border);
}
.pf-mobile-nav a:last-child { border-bottom: none; }

/* ────────────────────────────────────────────
   HERO
──────────────────────────────────────────── */
.pf-hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding-top: 64px;  /* navbar height */
}
.pf-hero-inner {
  width: 100%;
  padding: var(--sp-8) 0;
}
.pf-hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--color-text-2);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 999px;
  padding: 5px 14px;
  margin-bottom: var(--sp-4);
}
.pf-hero-badge-dot {
  width: 7px;
  height: 7px;
  background: #22C55E;
  border-radius: 50%;
  flex-shrink: 0;
}
.pf-hero-heading {
  font-size: clamp(2.75rem, 7vw, 5.25rem);
  font-weight: 700;
  letter-spacing: -0.04em;
  line-height: 1.04;
  color: var(--color-text);
  margin-bottom: var(--sp-3);
  max-width: 800px;
}
.pf-hero-heading em {
  font-style: normal;
  color: var(--color-accent);
}
.pf-hero-sub {
  font-size: 1.125rem;
  color: var(--color-text-2);
  max-width: 520px;
  line-height: 1.75;
  margin-bottom: var(--sp-5);
}
.pf-hero-actions {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
  margin-bottom: var(--sp-8);
}

/* Buttons */
.btn-pf-primary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 24px;
  background: var(--color-text);
  color: var(--color-bg);
  font-family: var(--font);
  font-size: 0.9375rem;
  font-weight: 600;
  border-radius: var(--r-sm);
  border: none;
  cursor: pointer;
  transition: background var(--ease), transform var(--ease), box-shadow var(--ease);
  text-decoration: none;
}
.btn-pf-primary:hover {
  background: #E5E5E5;
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
  color: var(--color-bg);
}
.btn-pf-secondary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 11px 24px;
  background: transparent;
  color: var(--color-text-2);
  font-family: var(--font);
  font-size: 0.9375rem;
  font-weight: 500;
  border-radius: var(--r-sm);
  border: 1px solid var(--color-border-2);
  cursor: pointer;
  transition: all var(--ease);
  text-decoration: none;
}
.btn-pf-secondary:hover {
  background: var(--color-surface);
  border-color: var(--color-text-3);
  color: var(--color-text);
}

/* Hero stats row */
.pf-hero-stats {
  display: flex;
  align-items: center;
  gap: var(--sp-5);
  padding-top: var(--sp-4);
  border-top: 1px solid var(--color-border);
}
.pf-stat { display: flex; flex-direction: column; gap: 2px; }
.pf-stat-num {
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: -0.04em;
  color: var(--color-text);
}
.pf-stat-label {
  font-size: 0.8125rem;
  color: var(--color-text-3);
}
.pf-stat-div {
  width: 1px;
  height: 36px;
  background: var(--color-border);
}

/* ────────────────────────────────────────────
   ABOUT
──────────────────────────────────────────── */
.pf-about-text p + p { margin-top: var(--sp-2); }
.pf-about-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--r-lg);
  padding: var(--sp-4);
}
.pf-about-card-row {
  display: flex;
  align-items: flex-start;
  gap: var(--sp-2);
  padding: var(--sp-2) 0;
  border-bottom: 1px solid var(--color-border);
}
.pf-about-card-row:last-child { border-bottom: none; padding-bottom: 0; }
.pf-about-card-row:first-child { padding-top: 0; }
.pf-about-icon {
  width: 36px;
  height: 36px;
  border-radius: var(--r-sm);
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  flex-shrink: 0;
}
.pf-about-card-label { font-size: 0.8125rem; color: var(--color-text-3); margin-bottom: 1px; }
.pf-about-card-value { font-size: 0.9375rem; font-weight: 500; color: var(--color-text); }

/* ────────────────────────────────────────────
   PROJECT CARDS
──────────────────────────────────────────── */
.pf-proj-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
}
.pf-proj-card {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--r-lg);
  overflow: hidden;
  transition: transform var(--ease-md), box-shadow var(--ease-md), border-color var(--ease-md);
  cursor: default;
}
.pf-proj-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: var(--color-border-2);
}
.pf-proj-preview {
  width: 100%;
  aspect-ratio: 16/10;
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 3rem;
  position: relative;
  overflow: hidden;
}
.pf-proj-preview-label {
  position: absolute;
  top: 12px;
  left: 12px;
  font-size: 0.6875rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--color-text-3);
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: 4px;
  padding: 3px 8px;
}
.pf-proj-body { padding: var(--sp-3); }
.pf-proj-title {
  font-size: 1.0625rem;
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: 6px;
  letter-spacing: -0.02em;
}
.pf-proj-desc {
  font-size: 0.875rem;
  color: var(--color-text-2);
  line-height: 1.6;
  margin-bottom: var(--sp-2);
}
.pf-tags { display: flex; gap: 6px; flex-wrap: wrap; margin-bottom: var(--sp-2); }
.pf-tag {
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--color-text-3);
  background: var(--color-surface-2);
  border: 1px solid var(--color-border);
  border-radius: 4px;
  padding: 3px 8px;
}
.pf-proj-links {
  display: flex;
  gap: 16px;
  padding-top: var(--sp-2);
  border-top: 1px solid var(--color-border);
  margin-top: var(--sp-2);
}
.pf-proj-link {
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--color-text-3);
  display: flex;
  align-items: center;
  gap: 5px;
  transition: color var(--ease);
}
.pf-proj-link:hover { color: var(--color-text); }

/* ────────────────────────────────────────────
   SKILLS
──────────────────────────────────────────── */
.pf-skill-group { margin-bottom: var(--sp-4); }
.pf-skill-group:last-child { margin-bottom: 0; }
.pf-skill-group-title {
  font-size: 0.8125rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--color-text-3);
  margin-bottom: 12px;
  display: flex;
  align-items: center;
  gap: 8px;
}
.pf-skill-group-title::after {
  content: '';
  flex: 1;
  height: 1px;
  background: var(--color-border);
}
.pf-skill-tags { display: flex; flex-wrap: wrap; gap: 8px; }
.pf-skill-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-text-2);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--r-sm);
  padding: 6px 14px;
  transition: all var(--ease);
}
.pf-skill-tag:hover {
  background: var(--color-bg);
  border-color: var(--color-border-2);
  color: var(--color-text);
  transform: translateY(-1px);
  box-shadow: var(--shadow-sm);
}

/* ────────────────────────────────────────────
   EXPERIENCE
──────────────────────────────────────────── */
.pf-exp-list { display: flex; flex-direction: column; gap: 0; }
.pf-exp-item {
  display: grid;
  grid-template-columns: 160px 1fr;
  gap: var(--sp-4);
  padding: var(--sp-4) 0;
  border-bottom: 1px solid var(--color-border);
  transition: background var(--ease);
}
.pf-exp-item:first-child { border-top: 1px solid var(--color-border); }
.pf-exp-meta {
  padding-top: 3px;
}
.pf-exp-period {
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--color-text-3);
  font-variant-numeric: tabular-nums;
}
.pf-exp-company {
  font-size: 0.8125rem;
  color: var(--color-text-3);
  margin-top: 2px;
}
.pf-exp-role {
  font-size: 1.0625rem;
  font-weight: 600;
  letter-spacing: -0.02em;
  color: var(--color-text);
  margin-bottom: 6px;
}
.pf-exp-desc {
  font-size: 0.9rem;
  color: var(--color-text-2);
  line-height: 1.7;
  margin-bottom: var(--sp-2);
}

/* ────────────────────────────────────────────
   CONTACT FORM
──────────────────────────────────────────── */
.pf-form-wrap {
  max-width: 580px;
  margin: 0 auto;
}
.pf-form-group { margin-bottom: var(--sp-3); }
.pf-form-label {
  display: block;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-text);
  margin-bottom: 6px;
}
.pf-form-input,
.pf-form-textarea {
  width: 100%;
  font-family: var(--font);
  font-size: 0.9375rem;
  color: var(--color-text);
  background: var(--color-bg);
  border: 1px solid var(--color-border-2);
  border-radius: var(--r-sm);
  padding: 11px 14px;
  outline: none;
  transition: border-color var(--ease), box-shadow var(--ease);
  resize: vertical;
}
.pf-form-input::placeholder,
.pf-form-textarea::placeholder { color: var(--color-text-3); }
.pf-form-input:focus,
.pf-form-textarea:focus {
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px rgba(26,86,219,.08);
}
.pf-form-input.is-error,
.pf-form-textarea.is-error { border-color: #EF4444; }
.pf-field-error {
  font-size: 0.8125rem;
  color: #EF4444;
  margin-top: 4px;
  display: none;
}
.pf-form-input.is-error ~ .pf-field-error,
.pf-form-textarea.is-error ~ .pf-field-error { display: block; }

/* ────────────────────────────────────────────
   FOOTER
──────────────────────────────────────────── */
.pf-footer {
  padding: var(--sp-5) 0;
  border-top: 1px solid var(--color-border);
}
.pf-footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--sp-2);
}
.pf-footer-copy { font-size: 0.875rem; color: var(--color-text-3); }
.pf-footer-links { display: flex; gap: var(--sp-3); }
.pf-footer-link {
  font-size: 0.875rem;
  color: var(--color-text-3);
  transition: color var(--ease);
}
.pf-footer-link:hover { color: var(--color-text); }

/* ────────────────────────────────────────────
   SCROLL REVEAL (subtle)
──────────────────────────────────────────── */
.pf-reveal {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.55s ease, transform 0.55s ease;
}
.pf-reveal.visible {
  opacity: 1;
  transform: translateY(0);
}
.pf-reveal-delay-1 { transition-delay: 0.08s; }
.pf-reveal-delay-2 { transition-delay: 0.16s; }
.pf-reveal-delay-3 { transition-delay: 0.24s; }
.pf-reveal-delay-4 { transition-delay: 0.32s; }

/* ────────────────────────────────────────────
   TOAST NOTIFICATION
──────────────────────────────────────────── */
.pf-toast {
  position: fixed;
  bottom: 24px;
  right: 24px;
  background: var(--color-text);
  color: var(--color-bg);
  font-size: 0.875rem;
  font-weight: 500;
  padding: 12px 20px;
  border-radius: var(--r-md);
  box-shadow: var(--shadow-lg);
  z-index: 9999;
  display: flex;
  align-items: center;
  gap: 10px;
  transform: translateY(20px);
  opacity: 0;
  transition: all 0.35s ease;
  pointer-events: none;
}
.pf-toast.show { transform: translateY(0); opacity: 1; }

/* ────────────────────────────────────────────
   RESPONSIVE
──────────────────────────────────────────── */
@media (max-width: 768px) {
  .pf-nav-links, .pf-nav-cta { display: none !important; }
  .pf-hamburger { display: flex; }
  .pf-proj-grid { grid-template-columns: 1fr; }
  .pf-exp-item {
    grid-template-columns: 1fr;
    gap: var(--sp-1);
    padding: var(--sp-3) 0;
  }
  .pf-hero-stats { flex-wrap: wrap; gap: var(--sp-3); }
  .pf-stat-div { display: none; }
  .pf-hero-heading { font-size: clamp(2.25rem, 10vw, 4rem); }
  .section-block, .section-block--alt { padding: var(--sp-6) 0; }
  .pf-about-grid { gap: var(--sp-4); }
}
@media (max-width: 576px) {
  .pf-container { padding: 0 var(--sp-2); }
  .pf-hero-actions { flex-direction: column; align-items: flex-start; }
}

/* ────────────────────────────────────────────
   MISC UTILITY
──────────────────────────────────────────── */
.text-accent  { color: var(--color-accent); }
.bg-surface   { background: var(--color-surface); }
.border-subtle{ border: 1px solid var(--color-border); }
.rounded-pf   { border-radius: var(--r-md); }