/* ═══════════════════════════════════════════════════════════════
   port7 · Mustafa Shaikh · Obsidian + Snowy White Theme
   ═══════════════════════════════════════════════════════════════ */

/* ── Design Tokens ──────────────────────────────────────────── */
:root {
  /* Obsidian palette */
  --obsidian-900: #0d0d0f;
  --obsidian-800: #131318;
  --obsidian-700: #1c1c24;
  --obsidian-600: #26262f;
  --obsidian-500: #3a3a47;
  --obsidian-400: #5a5a6e;
  --obsidian-300: #8888a0;

  /* Snow palette */
  --snow-100: #ffffff;
  --snow-200: #f7f7fa;
  --snow-300: #ededf4;
  --snow-400: #dddde8;

  /* Accent */
  --accent: #c8c0e8;       /* soft lavender-white — elegant on obsidian */
  --accent-dim: #9890c0;

  /* Typography */
  --font-sans: 'Inter', system-ui, -apple-system, sans-serif;
  --font-serif: 'Playfair Display', Georgia, serif;

  /* Spacing */
  --section-gap: clamp(5rem, 10vw, 8rem);
  --container-max: 1140px;
  --container-pad: clamp(1.25rem, 5vw, 2.5rem);

  /* Motion */
  --ease: cubic-bezier(0.4, 0, 0.2, 1);
  --dur: 0.28s;
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: 5rem;
  font-size: 16px;
}

body {
  font-family: var(--font-sans);
  background-color: var(--obsidian-900);
  color: var(--snow-300);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

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

/* ── Snow Texture ───────────────────────────────────────────── */
/*
  Pure CSS snowy/grain texture using SVG noise as a data URI.
  Applied as a fixed overlay so it drifts over all content.
*/
.snow-texture {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  opacity: 0.032;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='300' height='300'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='300' height='300' filter='url(%23n)' opacity='1'/%3E%3C/svg%3E");
  background-repeat: repeat;
  background-size: 300px 300px;
}

/* ── Layout Utility ─────────────────────────────────────────── */
.container {
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: var(--container-pad);
}

/* ── Navigation ─────────────────────────────────────────────── */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  padding: 0;
  transition: background var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}

.site-header.scrolled {
  background: rgba(13, 13, 15, 0.92);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  box-shadow: 0 1px 0 rgba(255, 255, 255, 0.06);
}

.nav {
  display: flex;
  align-items: center;
  gap: 2rem;
  padding-block: 1.1rem;
}

.nav-logo {
  font-family: var(--font-serif);
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--snow-100);
  letter-spacing: 0.04em;
  margin-right: auto;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 0.25rem;
  flex-wrap: wrap;
}

.nav-link {
  padding: 0.4rem 0.85rem;
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--snow-400);
  border-radius: 6px;
  transition: color var(--dur), background var(--dur);
}
.nav-link:hover,
.nav-link.active {
  color: var(--snow-100);
  background: rgba(255, 255, 255, 0.06);
}

.nav-cta {
  margin-left: 0.75rem;
  padding: 0.45rem 1.1rem;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--obsidian-900);
  background: var(--snow-200);
  border-radius: 6px;
  transition: background var(--dur), transform var(--dur);
  white-space: nowrap;
}
.nav-cta:hover { background: var(--snow-100); transform: translateY(-1px); }

/* Hamburger */
.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  background: none;
  border: none;
  padding: 6px;
  width: 36px;
  height: 36px;
}
.nav-toggle span {
  display: block;
  height: 2px;
  background: var(--snow-300);
  border-radius: 2px;
  transition: transform var(--dur), opacity var(--dur);
}
.nav-toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

@media (max-width: 768px) {
  .nav-toggle { display: flex; }
  .nav-links {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: flex-start;
    gap: 0;
    padding: 1rem var(--container-pad);
    background: rgba(13, 13, 15, 0.97);
    backdrop-filter: blur(16px);
    border-top: 1px solid rgba(255,255,255,0.07);
  }
  .nav-links.open { display: flex; }
  .nav-link { width: 100%; padding: 0.75rem 0.5rem; }
  .nav-cta { margin: 0.75rem 0 0 0; width: 100%; text-align: center; }
}

/* ── Section Shared ─────────────────────────────────────────── */
.section {
  position: relative;
  z-index: 1;
  padding-block: var(--section-gap);
}

.section-alt {
  background: var(--obsidian-800);
}

.section-label {
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent-dim);
  margin-bottom: 0.9rem;
}

.section-title {
  font-family: var(--font-serif);
  font-size: clamp(2rem, 5vw, 3.2rem);
  font-weight: 700;
  color: var(--snow-100);
  line-height: 1.2;
  margin-bottom: 3rem;
}

.section-title em {
  font-style: italic;
  color: var(--accent);
}

/* ── Hero ───────────────────────────────────────────────────── */
.hero {
  position: relative;
  z-index: 1;
  min-height: 100svh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding-top: 6rem;
  padding-bottom: 3rem;
  /* subtle radial glow */
  background: radial-gradient(ellipse 70% 60% at 65% 45%,
    rgba(200, 192, 232, 0.07) 0%,
    transparent 70%);
}

.hero-inner {
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: center;
  gap: 4rem;
}

.hero-eyebrow {
  font-size: 0.82rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent-dim);
  margin-bottom: 1rem;
}

.hero-title {
  font-family: var(--font-serif);
  font-size: clamp(2.8rem, 7vw, 5.5rem);
  font-weight: 700;
  color: var(--snow-100);
  line-height: 1.1;
  margin-bottom: 1.5rem;
}

.hero-title .accent {
  color: var(--accent);
}

.hero-sub {
  font-size: 1.05rem;
  color: var(--obsidian-300);
  line-height: 1.75;
  max-width: 42ch;
  margin-bottom: 2.5rem;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

/* Photo */
.hero-photo {
  flex-shrink: 0;
}

.photo-frame {
  width: clamp(180px, 22vw, 280px);
  aspect-ratio: 1;
  border-radius: 50%;
  overflow: hidden;
  border: 3px solid rgba(200, 192, 232, 0.25);
  box-shadow:
    0 0 0 8px rgba(200, 192, 232, 0.04),
    0 20px 60px rgba(0, 0, 0, 0.5);
  background: var(--obsidian-700);
}

.photo-frame img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: top center;
}

/* Scroll hint */
.hero-scroll-hint {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
  position: absolute;
  bottom: 2.5rem;
  left: 50%;
  transform: translateX(-50%);
  opacity: 0.4;
}

.scroll-line {
  display: block;
  width: 1px;
  height: 48px;
  background: linear-gradient(to bottom, transparent, var(--snow-400));
  animation: scrollLine 2s ease-in-out infinite;
}

@keyframes scrollLine {
  0%, 100% { opacity: 0.4; transform: scaleY(1); }
  50%       { opacity: 1;   transform: scaleY(0.6); }
}

.scroll-label {
  font-size: 0.65rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--snow-400);
}

@media (max-width: 640px) {
  .hero-inner {
    grid-template-columns: 1fr;
    gap: 2.5rem;
    text-align: center;
  }
  .hero-photo { order: -1; margin-inline: auto; }
  .hero-actions { justify-content: center; }
  .hero-sub { max-width: 100%; margin-inline: auto; }
  .hero-scroll-hint { display: none; }
}

/* ── Buttons ────────────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4em;
  padding: 0.7rem 1.5rem;
  font-size: 0.9rem;
  font-weight: 600;
  border-radius: 8px;
  border: none;
  transition: background var(--dur), color var(--dur), transform var(--dur), box-shadow var(--dur);
  white-space: nowrap;
}

.btn:hover { transform: translateY(-2px); }
.btn:active { transform: translateY(0); }

.btn-primary {
  background: var(--snow-200);
  color: var(--obsidian-900);
  box-shadow: 0 2px 16px rgba(255,255,255,0.08);
}
.btn-primary:hover { background: var(--snow-100); box-shadow: 0 4px 24px rgba(255,255,255,0.12); }

.btn-outline {
  background: transparent;
  color: var(--snow-300);
  border: 1px solid rgba(255,255,255,0.18);
}
.btn-outline:hover { background: rgba(255,255,255,0.05); color: var(--snow-100); }

.btn-ghost {
  background: transparent;
  color: var(--obsidian-300);
}
.btn-ghost:hover { color: var(--snow-200); background: rgba(255,255,255,0.04); }

.btn-full { width: 100%; justify-content: center; }

/* ── About ──────────────────────────────────────────────────── */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 320px;
  gap: 4rem;
  align-items: start;
}

.about-lead {
  font-size: 1.1rem;
  color: var(--snow-200);
  line-height: 1.8;
  margin-bottom: 1.25rem;
}

.about-main p { color: var(--obsidian-300); margin-bottom: 1rem; }

.highlights {
  margin-top: 2.5rem;
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.highlight-item {
  display: flex;
  gap: 1.1rem;
  align-items: flex-start;
}

.highlight-icon {
  font-size: 1.35rem;
  flex-shrink: 0;
  margin-top: 0.1rem;
}

.highlight-item strong {
  display: block;
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--snow-200);
  margin-bottom: 0.25rem;
}

.highlight-item p { margin: 0; font-size: 0.9rem; color: var(--obsidian-400); line-height: 1.6; }

/* Info cards (sidebar) */
.info-card {
  background: var(--obsidian-700);
  border: 1px solid rgba(255,255,255,0.06);
  border-radius: 12px;
  padding: 1.5rem;
  margin-bottom: 1.25rem;
}

.info-card-title {
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent-dim);
  margin-bottom: 1rem;
}

.info-list { display: flex; flex-direction: column; gap: 0.6rem; }
.info-list li { display: flex; flex-direction: column; gap: 0.1rem; }
.info-key { font-size: 0.72rem; color: var(--obsidian-400); text-transform: uppercase; letter-spacing: 0.08em; }
.info-val { font-size: 0.9rem; color: var(--snow-200); font-weight: 500; }

.hobbies-list { display: flex; flex-direction: column; gap: 0.55rem; }
.hobbies-list li { font-size: 0.9rem; color: var(--snow-300); line-height: 1.5; }

.skill-tags { display: flex; flex-wrap: wrap; gap: 0.5rem; }

.tag {
  display: inline-block;
  padding: 0.28rem 0.75rem;
  font-size: 0.78rem;
  font-weight: 500;
  color: var(--snow-300);
  background: rgba(255,255,255,0.07);
  border: 1px solid rgba(255,255,255,0.1);
  border-radius: 20px;
  white-space: nowrap;
}

@media (max-width: 900px) {
  .about-grid { grid-template-columns: 1fr; }
}

/* ── Experience / Timeline ──────────────────────────────────── */
.timeline {
  position: relative;
  padding-left: 2.5rem;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 0.55rem;
  top: 0.6rem;
  bottom: 0.6rem;
  width: 1px;
  background: linear-gradient(to bottom, rgba(200,192,232,0.3), transparent);
}

.timeline-card {
  position: relative;
  margin-bottom: 3rem;
}

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

.timeline-marker {
  position: absolute;
  left: -2.1rem;
  top: 0.5rem;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 0 3px rgba(200, 192, 232, 0.15);
}

.timeline-content {
  background: var(--obsidian-700);
  border: 1px solid rgba(255,255,255,0.06);
  border-radius: 14px;
  padding: 1.75rem 2rem;
  transition: border-color var(--dur);
}

.timeline-content:hover { border-color: rgba(200, 192, 232, 0.18); }

.timeline-header {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: flex-start;
  gap: 0.5rem 1.5rem;
  margin-bottom: 1.25rem;
}

.timeline-role {
  font-family: var(--font-serif);
  font-size: 1.2rem;
  font-weight: 600;
  color: var(--snow-100);
  margin-bottom: 0.25rem;
}

.timeline-org {
  font-size: 0.85rem;
  color: var(--accent-dim);
  font-weight: 500;
}

.timeline-date {
  font-size: 0.78rem;
  color: var(--obsidian-400);
  white-space: nowrap;
  padding: 0.2rem 0.75rem;
  border: 1px solid rgba(255,255,255,0.09);
  border-radius: 20px;
  height: fit-content;
}

.timeline-bullets {
  list-style: none;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}

.timeline-bullets li {
  position: relative;
  padding-left: 1.3rem;
  font-size: 0.92rem;
  color: var(--obsidian-300);
  line-height: 1.65;
}

.timeline-bullets li::before {
  content: '—';
  position: absolute;
  left: 0;
  color: var(--accent-dim);
  font-size: 0.8rem;
  top: 0.1rem;
}

/* ── Projects ───────────────────────────────────────────────── */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(min(100%, 480px), 1fr));
  gap: 1.75rem;
}

.project-card {
  background: var(--obsidian-700);
  border: 1px solid rgba(255,255,255,0.06);
  border-radius: 16px;
  padding: 1.75rem 2rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
  transition: border-color var(--dur), transform var(--dur), box-shadow var(--dur);
}

.project-card:hover {
  border-color: rgba(200, 192, 232, 0.18);
  transform: translateY(-4px);
  box-shadow: 0 16px 48px rgba(0,0,0,0.35);
}

.project-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.project-icon { font-size: 1.6rem; }

.project-links { display: flex; gap: 0.75rem; }

.project-link {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--accent-dim);
  transition: color var(--dur);
}
.project-link:hover { color: var(--accent); }

.project-name {
  font-family: var(--font-serif);
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--snow-100);
}

.project-desc {
  font-size: 0.9rem;
  color: var(--obsidian-300);
  line-height: 1.7;
  flex: 1;
}

.project-features h4 {
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--obsidian-400);
  margin-bottom: 0.6rem;
}

.project-features ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.project-features li {
  font-size: 0.85rem;
  color: var(--snow-300);
  padding-left: 1rem;
  position: relative;
}

.project-features li::before {
  content: '·';
  position: absolute;
  left: 0;
  color: var(--accent-dim);
}

.project-stack { display: flex; flex-wrap: wrap; gap: 0.4rem; }

/* ── Contact ────────────────────────────────────────────────── */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1.6fr;
  gap: 4rem;
  align-items: start;
}

.contact-lead {
  font-size: 1.05rem;
  color: var(--snow-300);
  line-height: 1.75;
  margin-bottom: 2rem;
}

.contact-details { display: flex; flex-direction: column; gap: 1rem; }

.contact-details li { display: flex; align-items: center; gap: 0.85rem; }

.contact-icon { font-size: 1.15rem; }

.contact-link {
  font-size: 0.95rem;
  color: var(--snow-200);
  font-weight: 500;
  transition: color var(--dur);
}
.contact-link:hover { color: var(--accent); }

/* Form */
.contact-form { display: flex; flex-direction: column; gap: 1.25rem; }

.form-group { display: flex; flex-direction: column; gap: 0.4rem; }

.form-group label {
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--obsidian-300);
}

.form-group input,
.form-group textarea {
  width: 100%;
  padding: 0.85rem 1rem;
  font-family: var(--font-sans);
  font-size: 0.95rem;
  color: var(--snow-200);
  background: var(--obsidian-700);
  border: 1px solid rgba(255,255,255,0.1);
  border-radius: 10px;
  outline: none;
  resize: vertical;
  transition: border-color var(--dur), box-shadow var(--dur);
}

.form-group input::placeholder,
.form-group textarea::placeholder { color: var(--obsidian-400); }

.form-group input:focus,
.form-group textarea:focus {
  border-color: var(--accent-dim);
  box-shadow: 0 0 0 3px rgba(200, 192, 232, 0.1);
}

/* Validation states */
.form-group input.is-valid   { border-color: #6bcb8b; }
.form-group input.is-invalid { border-color: #e07070; }
.form-group textarea.is-valid   { border-color: #6bcb8b; }
.form-group textarea.is-invalid { border-color: #e07070; }

.field-error {
  font-size: 0.78rem;
  color: #e07070;
  min-height: 1em;
}

.form-status {
  font-size: 0.88rem;
  text-align: center;
  min-height: 1.4em;
  color: var(--obsidian-300);
}

.form-status.success { color: #6bcb8b; }
.form-status.error   { color: #e07070; }

@media (max-width: 768px) {
  .contact-grid { grid-template-columns: 1fr; gap: 3rem; }
}

/* ── Footer ─────────────────────────────────────────────────── */
.site-footer {
  position: relative;
  z-index: 1;
  padding-block: 3rem;
  border-top: 1px solid rgba(255,255,255,0.06);
  background: var(--obsidian-900);
}

.footer-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1.25rem;
  text-align: center;
}

.footer-name {
  font-family: var(--font-serif);
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--snow-100);
}

.footer-nav {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.25rem 1.5rem;
}

.footer-nav a {
  font-size: 0.85rem;
  color: var(--obsidian-400);
  transition: color var(--dur);
}
.footer-nav a:hover { color: var(--snow-200); }

.footer-copy {
  font-size: 0.78rem;
  color: var(--obsidian-500);
}

/* ── Reveal animation ────────────────────────────────────────── */
.reveal {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.55s var(--ease), transform 0.55s var(--ease);
}
.reveal.visible {
  opacity: 1;
  transform: none;
}

/* ── Reduced motion ──────────────────────────────────────────── */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
  html { scroll-behavior: auto; }
}