/* ================================================================
   Muhammad Abdullah Ahmad — Portfolio Stylesheet
   Minimal, typography-led, single accent colour.
   ================================================================ */

/* ----------------------------------------------------------------
   0. TOKENS — everything visual is controlled from here.
   ---------------------------------------------------------------- */
:root {
  /* Surfaces */
  --bg:            #0b0b0d;
  --border:        rgba(255, 255, 255, 0.09);
  --border-strong: rgba(255, 255, 255, 0.18);

  /* Text */
  --text:          #f2f2f4;
  --text-secondary:#a3a3ad;
  --text-tertiary: #68686f;

  /* Accent — a single, controlled indigo-purple. Used sparingly. */
  --accent:        #7c6fea;
  --accent-hover:  #6e60e0;
  --accent-soft:   rgba(124, 111, 234, 0.12);

  /* Type */
  --font:          'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --mono:          'JetBrains Mono', ui-monospace, monospace;

  /* Spacing scale (8px base) */
  --sp-1: 8px;
  --sp-2: 16px;
  --sp-3: 24px;
  --sp-4: 32px;
  --sp-5: 48px;
  --sp-6: 64px;
  --sp-7: 96px;

  /* Layout */
  --w-text:  640px;   /* prose column */
  --w-wide:  920px;   /* projects / timeline */
  --nav-h:   64px;

  --ease: 0.15s ease;
}

/* ----------------------------------------------------------------
   1. RESET
   ---------------------------------------------------------------- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--nav-h) + 16px);
}

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; display: block; }
a   { text-decoration: none; color: inherit; }
ul, ol { list-style: none; }
address { font-style: normal; }
button { font: inherit; cursor: pointer; }

a:focus-visible,
button:focus-visible,
input:focus-visible,
textarea:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

::selection { background: var(--accent-soft); color: var(--text); }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }
}

/* ----------------------------------------------------------------
   2. TYPE SCALE
   ---------------------------------------------------------------- */
.mono {
  font-family: var(--mono);
  font-size: 0.8rem;
  letter-spacing: 0.02em;
}

.eyebrow {
  font-family: var(--mono);
  font-size: 0.78rem;
  color: var(--text-tertiary);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: var(--sp-2);
  display: block;
}

h1, h2, h3 { font-weight: 600; letter-spacing: -0.02em; line-height: 1.15; }

h1 { font-size: clamp(2.1rem, 4.4vw, 3.1rem); font-weight: 700; }
h2 { font-size: clamp(1.4rem, 2.6vw, 1.7rem); }
h3 { font-size: 1.05rem; font-weight: 600; }

p  { color: var(--text-secondary); }

/* ----------------------------------------------------------------
   3. LAYOUT PRIMITIVES
   ---------------------------------------------------------------- */
.container      { max-width: var(--w-wide); margin: 0 auto; padding: 0 var(--sp-3); }
.container-text { max-width: var(--w-text); margin: 0 auto; padding: 0 var(--sp-3); }

.section { padding: var(--sp-7) 0; border-top: 1px solid var(--border); }
.section:first-of-type { border-top: none; }

.section-head { margin-bottom: var(--sp-5); }
.section-head p { margin-top: var(--sp-2); max-width: 46ch; }

/* ----------------------------------------------------------------
   4. NAVBAR
   ---------------------------------------------------------------- */
.navbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: var(--nav-h);
  z-index: 100;
  border-bottom: 1px solid transparent;
  background: rgba(11, 11, 13, 0.82);
  backdrop-filter: none;
  transition: border-color var(--ease);
}
.navbar.scrolled { border-bottom-color: var(--border); }

.nav-inner {
  max-width: var(--w-wide);
  margin: 0 auto;
  padding: 0 var(--sp-3);
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-brand {
  font-family: var(--mono);
  font-size: 0.92rem;
  color: var(--text);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: var(--sp-4);
}

.nav-link {
  font-size: 0.9rem;
  color: var(--text-secondary);
  transition: color var(--ease);
}
.nav-link:hover,
.nav-link.active { color: var(--text); }

.nav-cv {
  font-family: var(--mono);
  font-size: 0.82rem;
  color: var(--text-secondary);
  border: 1px solid var(--border);
  padding: 6px 12px;
  border-radius: 6px;
  transition: border-color var(--ease), color var(--ease);
}
.nav-cv:hover { border-color: var(--border-strong); color: var(--text); }

.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  padding: 8px;
}
.ham-bar { width: 18px; height: 1.5px; background: var(--text); transition: transform var(--ease), opacity var(--ease); }
.hamburger[aria-expanded="true"] .ham-bar:nth-child(1) { transform: translateY(6.5px) rotate(45deg); }
.hamburger[aria-expanded="true"] .ham-bar:nth-child(2) { opacity: 0; }
.hamburger[aria-expanded="true"] .ham-bar:nth-child(3) { transform: translateY(-6.5px) rotate(-45deg); }

/* ----------------------------------------------------------------
   5. BUTTONS
   ---------------------------------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 18px;
  border-radius: 6px;
  font-size: 0.92rem;
  font-weight: 500;
  border: 1px solid transparent;
  transition: background var(--ease), border-color var(--ease), color var(--ease);
}

.btn-primary {
  background: var(--accent);
  color: #ffffff;
}
.btn-primary:hover { background: var(--accent-hover); }

.btn-outline {
  border-color: var(--border-strong);
  color: var(--text);
}
.btn-outline:hover { border-color: var(--accent); color: var(--accent); }

.hero-actions { display: flex; flex-wrap: wrap; gap: var(--sp-2); margin-top: var(--sp-4); }

/* ----------------------------------------------------------------
   6. HERO
   ---------------------------------------------------------------- */
.hero {
  padding: calc(var(--nav-h) + var(--sp-7)) 0 var(--sp-6);
}

.hero-text { max-width: var(--w-text); }

.hero p.hero-lede {
  font-size: 1.08rem;
  margin-top: var(--sp-3);
  max-width: 54ch;
}
.hero p.hero-lede-secondary {
  margin-top: var(--sp-2);
  color: var(--text-secondary);
}

.hero-links {
  display: flex;
  gap: var(--sp-3);
  margin-top: var(--sp-4);
}
.hero-links a {
  font-family: var(--mono);
  font-size: 0.82rem;
  color: var(--text-tertiary);
  border-bottom: 1px solid transparent;
  transition: color var(--ease), border-color var(--ease);
}
.hero-links a:hover { color: var(--text); border-color: var(--border-strong); }

/* ----------------------------------------------------------------
   7. ABOUT
   ---------------------------------------------------------------- */
.about-body p { margin-bottom: var(--sp-2); max-width: 62ch; }
.about-body p:last-child { margin-bottom: 0; }

.about-meta {
  margin-top: var(--sp-4);
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.about-meta-row {
  display: flex;
  gap: var(--sp-3);
  padding: var(--sp-1) 0;
  border-top: 1px solid var(--border);
  font-size: 0.9rem;
}
.about-meta-row:last-child { border-bottom: 1px solid var(--border); }
.about-meta-label { color: var(--text-tertiary); width: 130px; flex-shrink: 0; font-family: var(--mono); font-size: 0.78rem; padding-top: 2px; }
.about-meta-value { color: var(--text); }

/* ----------------------------------------------------------------
   8. SKILLS
   ---------------------------------------------------------------- */
.skills-list {
  display: grid;
  grid-template-columns: 160px 1fr;
  row-gap: var(--sp-2);
  column-gap: var(--sp-3);
}
.skills-list dt {
  font-family: var(--mono);
  font-size: 0.78rem;
  color: var(--text-tertiary);
  padding-top: 3px;
}
.skills-list dd { color: var(--text-secondary); }

/* ----------------------------------------------------------------
   9. PROJECTS
   ---------------------------------------------------------------- */
.project {
  border-left: 1px solid var(--border);
  padding: var(--sp-4) 0 var(--sp-4) var(--sp-3);
  transition: border-color var(--ease);
}
.project:hover { border-left-color: var(--accent); }
.project + .project { border-top: 1px solid var(--border); }

.project-top {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: var(--sp-2);
  flex-wrap: wrap;
  margin-bottom: var(--sp-2);
}

.project-title { display: flex; align-items: center; gap: 10px; }

.project-media {
  aspect-ratio: 16 / 9;
  border: 1px solid var(--border);
  border-radius: 6px;
  overflow: hidden;
  margin-bottom: var(--sp-3);
  background: #101013;
}
.project-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.project-link {
  font-family: var(--mono);
  font-size: 0.82rem;
  color: var(--text-tertiary);
  white-space: nowrap;
  border-bottom: 1px solid transparent;
  transition: color var(--ease), border-color var(--ease);
}
.project-link:hover { color: var(--accent); border-color: var(--accent); }

.project-rows { display: flex; flex-direction: column; gap: 10px; margin-top: var(--sp-2); }
.project-row { display: flex; gap: var(--sp-2); font-size: 0.94rem; }
.project-row-label {
  font-family: var(--mono);
  font-size: 0.75rem;
  color: var(--text-tertiary);
  width: 84px;
  flex-shrink: 0;
  padding-top: 3px;
}
.project-row-value { color: var(--text-secondary); }

.tech-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: var(--sp-2);
}
.tech-tag {
  font-family: var(--mono);
  font-size: 0.75rem;
  color: var(--text-tertiary);
  border: 1px solid var(--border);
  padding: 3px 8px;
  border-radius: 4px;
}

/* ----------------------------------------------------------------
   10. EXPERIENCE / EDUCATION TIMELINE
   ---------------------------------------------------------------- */
.timeline { display: flex; flex-direction: column; }

.tl-row {
  display: grid;
  grid-template-columns: 110px 1fr;
  gap: var(--sp-3);
  padding: var(--sp-3) 0;
  border-top: 1px solid var(--border);
}
.timeline .tl-row:last-child { border-bottom: 1px solid var(--border); }

.tl-date {
  font-family: var(--mono);
  font-size: 0.78rem;
  color: var(--text-tertiary);
  padding-top: 3px;
}

.tl-role { font-weight: 600; font-size: 0.98rem; }
.tl-org  { color: var(--text-tertiary); font-size: 0.88rem; margin-top: 2px; }
.tl-desc { margin-top: var(--sp-1); font-size: 0.92rem; max-width: 62ch; }

.tl-kind {
  font-family: var(--mono);
  font-size: 0.7rem;
  color: var(--text-tertiary);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

/* ----------------------------------------------------------------
   11. CONTACT
   ---------------------------------------------------------------- */
.contact-list { display: flex; flex-direction: column; gap: var(--sp-1); margin-top: var(--sp-3); }
.contact-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--sp-2) 0;
  border-top: 1px solid var(--border);
}
.contact-list .contact-row:last-child { border-bottom: 1px solid var(--border); }

.contact-label {
  font-family: var(--mono);
  font-size: 0.78rem;
  color: var(--text-tertiary);
}
.contact-value {
  font-size: 0.95rem;
  color: var(--text);
  border-bottom: 1px solid transparent;
  transition: color var(--ease), border-color var(--ease);
}
.contact-value:hover { color: var(--accent); border-color: var(--accent); }

/* ----------------------------------------------------------------
   12. FOOTER
   ---------------------------------------------------------------- */
.footer {
  border-top: 1px solid var(--border);
  padding: var(--sp-3) 0;
}
.footer-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
}
.footer-copy,
.footer-stack {
  font-size: 0.8rem;
  color: var(--text-tertiary);
}
.footer-stack { font-family: var(--mono); }

/* ----------------------------------------------------------------
   13. PAGE-LOAD FADE (very light, once)
   ---------------------------------------------------------------- */
@media (prefers-reduced-motion: no-preference) {
  .hero-text > * { opacity: 0; animation: fadeUp 0.5s ease forwards; }
  .hero-text > *:nth-child(1) { animation-delay: 0.02s; }
  .hero-text > *:nth-child(2) { animation-delay: 0.08s; }
  .hero-text > *:nth-child(3) { animation-delay: 0.14s; }
  .hero-text > *:nth-child(4) { animation-delay: 0.2s; }
  .hero-text > *:nth-child(5) { animation-delay: 0.26s; }
  .hero-text > *:nth-child(6) { animation-delay: 0.32s; }
}
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(6px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* ----------------------------------------------------------------
   14. RESPONSIVE
   ---------------------------------------------------------------- */
@media (max-width: 760px) {
  :root { --sp-7: 64px; --sp-6: 48px; }

  .nav-links { display: none; }
  .hamburger { display: flex; }

  .nav-links.open {
    display: flex;
    position: fixed;
    top: var(--nav-h);
    left: 0; right: 0;
    flex-direction: column;
    align-items: flex-start;
    gap: 0;
    background: var(--bg);
    border-bottom: 1px solid var(--border);
    padding: var(--sp-2) var(--sp-3) var(--sp-3);
  }
  .nav-links.open .nav-link,
  .nav-links.open .nav-cv {
    width: 100%;
    padding: var(--sp-1) 0;
    border: none;
  }

  .tl-row { grid-template-columns: 1fr; gap: 4px; }
  .skills-list { grid-template-columns: 1fr; row-gap: var(--sp-1); }
  .skills-list dt { padding-top: 0; }
  .about-meta-row { flex-direction: column; gap: 2px; }
  .about-meta-label { width: auto; }
  .project-row { flex-direction: column; gap: 2px; }
  .project-row-label { width: auto; }
}