/* ===========================================================
   MUHAMMAD ARSLAN — PORTFOLIO STYLESHEET
   Theme: Dark / Terminal-Database aesthetic
=========================================================== */

/* ---------- 1. ROOT VARIABLES (color tokens) ---------- */
:root {
  /* Core palette */
  --bg-base:        #0a0e0f;
  --bg-panel:       #0f1417;
  --bg-panel-2:     #121a1d;
  --border-soft:    #1a2326;
  --border-strong:  #233032;

  /* Accent */
  --accent:         #00d9a3;
  --accent-dim:     #00a884;
  --accent-glow:    rgba(0, 217, 163, 0.35);
  --accent-soft-bg: rgba(0, 217, 163, 0.08);

  /* Secondary accent (used very sparingly — warnings/highlights) */
  --accent-amber:   #ffb454;

  /* Text */
  --text-primary:   #e8ecec;
  --text-secondary: #9fb0b0;
  --text-muted:     #5a6b6b;

  /* Status colors */
  --red:    #ff5f56;
  --yellow: #ffbd2e;
  --green:  #27c93f;

  /* Type */
  --font-mono: 'JetBrains Mono', 'Courier New', monospace;
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;

  /* Layout */
  --max-width: 1140px;
  --section-pad-y: 120px;
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 18px;

  /* Shadows */
  --shadow-card: 0 4px 24px rgba(0, 0, 0, 0.45);
  --shadow-glow: 0 0 32px var(--accent-glow);

  /* Motion */
  --ease: cubic-bezier(0.16, 1, 0.3, 1);
}

/* ---------- 2. RESET ---------- */
* { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  background: var(--bg-base);
  color: var(--text-primary);
  font-family: var(--font-sans);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

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

::selection {
  background: var(--accent);
  color: var(--bg-base);
}

/* Visible keyboard focus (accessibility) */
a:focus-visible,
button:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 4px;
}

/* Scrollbar */
::-webkit-scrollbar { width: 10px; }
::-webkit-scrollbar-track { background: var(--bg-base); }
::-webkit-scrollbar-thumb {
  background: var(--border-strong);
  border-radius: 10px;
}
::-webkit-scrollbar-thumb:hover { background: var(--accent-dim); }

/* Background grid texture (subtle) */
.hero-bg-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(var(--border-soft) 1px, transparent 1px),
    linear-gradient(90deg, var(--border-soft) 1px, transparent 1px);
  background-size: 48px 48px;
  mask-image: radial-gradient(ellipse 60% 50% at 50% 30%, black 40%, transparent 100%);
  opacity: 0.5;
  z-index: 0;
}

/* Cursor ambient glow that follows mouse (desktop only) */
.cursor-glow {
  position: fixed;
  width: 420px;
  height: 420px;
  border-radius: 50%;
  background: radial-gradient(circle, var(--accent-glow), transparent 70%);
  pointer-events: none;
  z-index: 0;
  opacity: 0;
  transition: opacity 0.4s ease;
  transform: translate(-50%, -50%);
  filter: blur(10px);
}

@media (hover: hover) and (pointer: fine) {
  .cursor-glow { opacity: 0.35; }
}

/* ---------- 3. NAVBAR ---------- */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: rgba(10, 14, 15, 0.7);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid transparent;
  transition: border-color 0.3s var(--ease), background 0.3s var(--ease);
}

.navbar.scrolled {
  border-bottom: 1px solid var(--border-soft);
  background: rgba(10, 14, 15, 0.92);
}

.nav-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 18px 32px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 1.1rem;
  letter-spacing: 0.02em;
  color: var(--text-primary);
}

.logo-bracket { color: var(--accent); }

.nav-links {
  display: flex;
  align-items: center;
  gap: 32px;
}

.nav-link {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  gap: 6px;
  transition: color 0.25s var(--ease);
  position: relative;
}

.nav-link:hover { color: var(--accent); }

.nav-num {
  color: var(--accent);
  font-size: 0.72rem;
  opacity: 0.75;
}

.nav-link-cta {
  border: 1px solid var(--border-strong);
  padding: 8px 16px;
  border-radius: var(--radius-sm);
  color: var(--text-primary);
}

.nav-link-cta:hover {
  border-color: var(--accent);
  background: var(--accent-soft-bg);
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
}

.nav-toggle span {
  width: 22px;
  height: 2px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: all 0.3s var(--ease);
}

/* ---------- 4. HERO ---------- */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 140px 24px 80px;
  overflow: hidden;
}

.hero-inner {
  position: relative;
  z-index: 1;
  width: 100%;
  max-width: 760px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 36px;
}

/* Terminal window */
.terminal-window {
  width: 100%;
  background: var(--bg-panel);
  border: 1px solid var(--border-soft);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-card);
  overflow: hidden;
}

.terminal-bar {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 12px 16px;
  background: var(--bg-panel-2);
  border-bottom: 1px solid var(--border-soft);
}

.terminal-dots { display: flex; gap: 8px; }

.dot {
  width: 11px;
  height: 11px;
  border-radius: 50%;
  display: inline-block;
}
.dot-red { background: var(--red); }
.dot-yellow { background: var(--yellow); }
.dot-green { background: var(--green); }

.terminal-title {
  margin-left: 6px;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--text-muted);
}

.terminal-body {
  padding: 28px 24px 32px;
  font-family: var(--font-mono);
}

.terminal-line {
  font-size: 1rem;
  color: var(--text-primary);
  margin-bottom: 18px;
  min-height: 1.4em;
}

.prompt-sign { color: var(--accent); margin-right: 10px; }

.cursor-blink {
  color: var(--accent);
  animation: blink 1s step-end infinite;
}

@keyframes blink {
  0%, 50% { opacity: 1; }
  50.01%, 100% { opacity: 0; }
}

.query-result {
  border-top: 1px dashed var(--border-soft);
  padding-top: 18px;
  opacity: 0;
  transform: translateY(8px);
  transition: opacity 0.6s var(--ease), transform 0.6s var(--ease);
}

.query-result.visible {
  opacity: 1;
  transform: translateY(0);
}

.result-row {
  font-size: 0.92rem;
  color: var(--text-secondary);
  margin-bottom: 8px;
}

.result-key { color: var(--accent); }
.result-sep { color: var(--text-muted); margin-right: 6px; }

.status-pill {
  display: inline-block;
  background: var(--accent-soft-bg);
  color: var(--accent);
  padding: 2px 10px;
  border-radius: 20px;
  font-size: 0.78rem;
  border: 1px solid var(--accent-dim);
}

.result-meta {
  margin-top: 14px;
  font-size: 0.76rem;
  color: var(--text-muted);
}

/* Hero CTAs */
.hero-cta {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  justify-content: center;
}

.btn {
  font-family: var(--font-mono);
  font-size: 0.9rem;
  padding: 13px 28px;
  border-radius: var(--radius-sm);
  transition: all 0.25s var(--ease);
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.btn-primary {
  background: var(--accent);
  color: var(--bg-base);
  font-weight: 600;
  box-shadow: 0 0 0 0 var(--accent-glow);
}

.btn-primary:hover {
  box-shadow: var(--shadow-glow);
  transform: translateY(-2px);
}

.btn-ghost {
  border: 1px solid var(--border-strong);
  color: var(--text-primary);
}

.btn-ghost:hover {
  border-color: var(--accent);
  color: var(--accent);
  transform: translateY(-2px);
}

.hero-scroll-hint {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  color: var(--text-muted);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-top: 8px;
}

.scroll-line {
  width: 1px;
  height: 36px;
  background: linear-gradient(to bottom, var(--accent), transparent);
  animation: scrollPulse 2s ease-in-out infinite;
}

@keyframes scrollPulse {
  0%, 100% { opacity: 0.3; }
  50% { opacity: 1; }
}

/* ---------- 5. SECTION LAYOUT (shared) ---------- */
.section {
  padding: var(--section-pad-y) 24px;
  position: relative;
}

.section-inner {
  max-width: var(--max-width);
  margin: 0 auto;
}

.section-eyebrow {
  font-family: var(--font-mono);
  color: var(--accent);
  font-size: 0.85rem;
  letter-spacing: 0.05em;
  margin-bottom: 12px;
}

.section-title {
  font-family: var(--font-mono);
  font-size: clamp(1.8rem, 4vw, 2.6rem);
  font-weight: 700;
  margin-bottom: 56px;
  color: var(--text-primary);
}

/* ---------- 6. ABOUT ---------- */
.about-grid {
  display: grid;
  grid-template-columns: 1.3fr 1fr;
  gap: 56px;
  align-items: start;
}

.about-text p {
  color: var(--text-secondary);
  font-size: 1.05rem;
  margin-bottom: 20px;
}

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

.about-stats {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.stat-card {
  background: var(--bg-panel);
  border: 1px solid var(--border-soft);
  border-radius: var(--radius-md);
  padding: 22px 18px;
  display: flex;
  flex-direction: column;
  gap: 6px;
  transition: border-color 0.3s var(--ease), transform 0.3s var(--ease);
}

.stat-card:hover {
  border-color: var(--accent-dim);
  transform: translateY(-3px);
}

.stat-number {
  font-family: var(--font-mono);
  font-size: 2rem;
  font-weight: 700;
  color: var(--accent);
}

.stat-label {
  font-size: 0.82rem;
  color: var(--text-muted);
}

/* ---------- 7. EXPERIENCE TIMELINE ---------- */
.timeline {
  position: relative;
  padding-left: 32px;
  border-left: 1px solid var(--border-soft);
}

.timeline-item {
  position: relative;
  margin-bottom: 48px;
}

.timeline-item:last-child { margin-bottom: 0; }

.timeline-marker {
  position: absolute;
  left: -38px;
  top: 6px;
  width: 13px;
  height: 13px;
  border-radius: 50%;
  background: var(--bg-base);
  border: 2px solid var(--accent);
  box-shadow: 0 0 0 4px var(--bg-base), 0 0 0 5px var(--border-soft);
}

.timeline-content {
  background: var(--bg-panel);
  border: 1px solid var(--border-soft);
  border-radius: var(--radius-md);
  padding: 28px 30px;
  transition: border-color 0.3s var(--ease);
}

.timeline-content:hover { border-color: var(--border-strong); }

.timeline-head {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 4px;
}

.timeline-head h3 {
  font-size: 1.2rem;
  color: var(--text-primary);
}

.timeline-date {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--accent);
  white-space: nowrap;
}

.timeline-company {
  color: var(--text-muted);
  font-size: 0.9rem;
  margin-bottom: 16px;
}

.timeline-list li {
  position: relative;
  padding-left: 18px;
  color: var(--text-secondary);
  font-size: 0.95rem;
  margin-bottom: 8px;
}

.timeline-list li::before {
  content: '›';
  position: absolute;
  left: 0;
  color: var(--accent);
}

.timeline-list strong { color: var(--text-primary); }

/* ---------- 8. PROJECTS ---------- */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.project-card {
  background: var(--bg-panel);
  border: 1px solid var(--border-soft);
  border-radius: var(--radius-md);
  padding: 28px;
  display: flex;
  flex-direction: column;
  gap: 14px;
  transition: transform 0.3s var(--ease), border-color 0.3s var(--ease), box-shadow 0.3s var(--ease);
}

.project-card:hover {
  transform: translateY(-4px);
  border-color: var(--accent-dim);
  box-shadow: 0 12px 32px rgba(0, 217, 163, 0.08);
}

.project-card-head {
  display: flex;
}

.project-tag {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--accent);
  background: var(--accent-soft-bg);
  padding: 5px 10px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-soft);
}

.project-card h3 {
  font-size: 1.2rem;
  color: var(--text-primary);
}

.project-desc {
  color: var(--text-secondary);
  font-size: 0.94rem;
}

.project-stack {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.project-stack span {
  font-family: var(--font-mono);
  font-size: 0.74rem;
  color: var(--text-muted);
  border: 1px solid var(--border-soft);
  padding: 4px 9px;
  border-radius: 20px;
}

.project-output {
  margin-top: auto;
  padding-top: 14px;
  border-top: 1px dashed var(--border-soft);
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--text-muted);
}

.project-output p { margin-bottom: 4px; }
.output-good { color: var(--accent); font-weight: 600; }

/* ---------- 9. SKILLS SCHEMA TABLE ---------- */
.schema-table {
  border: 1px solid var(--border-soft);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.schema-row {
  display: grid;
  grid-template-columns: 240px 1fr;
  gap: 24px;
  padding: 16px 24px;
  border-bottom: 1px solid var(--border-soft);
  transition: background 0.25s var(--ease);
}

.schema-row:last-child { border-bottom: none; }

.schema-row:not(.schema-head):hover {
  background: var(--bg-panel-2);
}

.schema-head {
  background: var(--bg-panel);
  font-family: var(--font-mono);
  color: var(--text-muted);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.schema-col {
  font-family: var(--font-mono);
  color: var(--accent);
  font-size: 0.92rem;
  font-weight: 600;
}

.schema-vals {
  color: var(--text-secondary);
  font-size: 0.92rem;
}

/* ---------- 10. EDUCATION ---------- */
.edu-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
  margin-bottom: 48px;
}

.edu-card {
  background: var(--bg-panel);
  border: 1px solid var(--border-soft);
  border-radius: var(--radius-md);
  padding: 28px;

/* Small thumbnail row under the profile photo to switch images */
.photo-thumbs {
  display: flex;
  gap: 8px;
  padding: 12px;
  justify-content: center;
  background: linear-gradient(180deg, rgba(255,255,255,0.01), transparent);
}

.photo-thumbs .thumb {
  width: 56px;
  height: 56px;
  object-fit: cover;
  border-radius: 8px;
  border: 1px solid var(--border-soft);
  cursor: pointer;
  transition: transform 0.18s var(--ease), box-shadow 0.18s var(--ease), border-color 0.18s var(--ease);
}

.photo-thumbs .thumb:hover {
  transform: translateY(-4px);
  box-shadow: 0 10px 24px rgba(0,0,0,0.45), var(--shadow-glow-2);
  border-color: var(--accent);
}

.photo-thumbs .thumb.active {
  box-shadow: 0 14px 36px rgba(0,0,0,0.55), 0 0 18px var(--accent-glow);
  transform: translateY(-6px) scale(1.02);
  border-color: var(--accent-bright);
}

.about-photo-frame { display: flex; flex-direction: column; align-items: center; gap: 6px; }
}

.edu-card h3 {
  font-size: 1.1rem;
  color: var(--text-primary);
  margin-bottom: 6px;
}

.edu-school {
  color: var(--accent);
  font-size: 0.9rem;
  margin-bottom: 2px;
}

.edu-date {
  font-family: var(--font-mono);
  color: var(--text-muted);
  font-size: 0.78rem;
  margin-bottom: 18px;
}

.edu-coursework-label {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: 10px;
}

.pill-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.pill {
  font-size: 0.78rem;
  color: var(--text-secondary);
  border: 1px solid var(--border-soft);
  padding: 5px 12px;
  border-radius: 20px;
}

.cert-list {
  background: var(--bg-panel);
  border: 1px solid var(--border-soft);
  border-radius: var(--radius-md);
  padding: 28px;
}

.cert-title {
  font-family: var(--font-mono);
  color: var(--text-muted);
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: 16px;
}

.cert-list ul li {
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 8px;
  padding: 12px 0;
  border-bottom: 1px solid var(--border-soft);
  color: var(--text-primary);
  font-size: 0.95rem;
}

.cert-list ul li:last-child { border-bottom: none; }

.cert-source {
  font-family: var(--font-mono);
  color: var(--text-muted);
  font-size: 0.82rem;
}

/* ---------- 11. CONTACT ---------- */
.contact { text-align: center; }

.contact .section-eyebrow,
.contact .section-title { text-align: center; }

.contact-sub {
  color: var(--text-secondary);
  font-size: 1.05rem;
  margin-top: -32px;
  margin-bottom: 48px;
}

.contact-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
}

.contact-card {
  background: var(--bg-panel);
  border: 1px solid var(--border-soft);
  border-radius: var(--radius-md);
  padding: 28px 16px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  transition: transform 0.3s var(--ease), border-color 0.3s var(--ease);
}

.contact-card:hover {
  transform: translateY(-4px);
  border-color: var(--accent);
  box-shadow: var(--shadow-glow);
}

.contact-icon {
  font-family: var(--font-mono);
  font-size: 1.3rem;
  color: var(--accent);
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  border: 1px solid var(--border-strong);
}

.contact-label {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.contact-value {
  color: var(--text-primary);
  font-size: 0.88rem;
  word-break: break-word;
}

/* ---------- 12. FOOTER ---------- */
.footer {
  text-align: center;
  padding: 32px 24px;
  border-top: 1px solid var(--border-soft);
  color: var(--text-muted);
  font-family: var(--font-mono);
  font-size: 0.78rem;
}

/* ---------- 13. SCROLL ANIMATIONS ---------- */
[data-animate] {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.7s var(--ease), transform 0.7s var(--ease);
}

[data-animate].in-view {
  opacity: 1;
  transform: translateY(0);
}

[data-animate][data-delay="1"] { transition-delay: 0.1s; }
[data-animate][data-delay="2"] { transition-delay: 0.2s; }

@media (prefers-reduced-motion: reduce) {
  * {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }
}

/* ---------- 14. RESPONSIVE ---------- */
@media (max-width: 900px) {
  .about-grid { grid-template-columns: 1fr; }
  .projects-grid { grid-template-columns: 1fr; }
  .edu-grid { grid-template-columns: 1fr; }
  .contact-grid { grid-template-columns: repeat(2, 1fr); }
  .schema-row { grid-template-columns: 1fr; gap: 6px; }
}

@media (max-width: 760px) {
  .nav-links {
    position: fixed;
    top: 64px;
    left: 0;
    right: 0;
    background: var(--bg-base);
    border-bottom: 1px solid var(--border-soft);
    flex-direction: column;
    align-items: flex-start;
    padding: 24px 32px;
    gap: 20px;
    transform: translateY(-110%);
    opacity: 0;
    transition: transform 0.35s var(--ease), opacity 0.35s var(--ease);
    pointer-events: none;
  }

  .nav-links.open {
    transform: translateY(0);
    opacity: 1;
    pointer-events: auto;
  }

  .nav-toggle { display: flex; }

  .nav-toggle.active span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
  .nav-toggle.active span:nth-child(2) { opacity: 0; }
  .nav-toggle.active span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

  .section { padding: 80px 20px; }
  .section-title { margin-bottom: 36px; }

  .about-stats { grid-template-columns: 1fr 1fr; }
  .contact-grid { grid-template-columns: 1fr 1fr; }

  .terminal-body { padding: 20px 16px 24px; }
}

@media (max-width: 480px) {
  .hero { padding: 120px 16px 60px; }
  .nav-inner { padding: 16px 20px; }
  .about-stats { grid-template-columns: 1fr; }
  .contact-grid { grid-template-columns: 1fr; }
  .terminal-line { font-size: 0.88rem; }
}