/* ============================================================
   KHAN AL-AMIN — PERSONAL SITE
   Design system: "Signal" — a creator's command center.
   One decisive accent (signal amber) on deep charcoal, with a
   monospace utility face for labels/data and a confident
   condensed display face for headlines.
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=Space+Grotesk:wght@400;500;600;700&family=JetBrains+Mono:wght@400;500;600&display=swap');

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  /* Palette */
  --bg: #0b0c0e;
  --bg-raised: #131417;
  --bg-card: #17181c;
  --line: #25272c;
  --line-soft: #1c1d21;
  --signal: #ff6a39;          /* primary accent — warm signal amber/orange */
  --signal-dim: #c44e29;
  --signal-glow: rgba(255, 106, 57, 0.18);
  --text: #f4f3f0;
  --text-dim: #a8a9ad;
  --text-faint: #6b6c70;

  --display: 'Space Grotesk', sans-serif;
  --mono: 'JetBrains Mono', monospace;

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

html {
  scroll-behavior: smooth;
  overflow-x: hidden;
}

body {
  font-family: var(--display);
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  overflow-x: hidden;
  position: relative;
}

/* subtle grain/texture backdrop */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  background-image:
    radial-gradient(circle at 15% 10%, var(--signal-glow), transparent 35%),
    radial-gradient(circle at 85% 0%, rgba(255,255,255,0.03), transparent 40%);
  pointer-events: none;
  z-index: 0;
}

img, video {
  max-width: 100%;
  height: auto;
  display: block;
}

::selection {
  background: var(--signal);
  color: #0b0c0e;
}

::-webkit-scrollbar { width: 9px; }
::-webkit-scrollbar-track { background: var(--bg); }
::-webkit-scrollbar-thumb { background: var(--line); border-radius: 6px; }
::-webkit-scrollbar-thumb:hover { background: var(--signal-dim); }

.eyebrow {
  font-family: var(--mono);
  font-size: 0.78rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--signal);
  display: inline-flex;
  align-items: center;
  gap: 0.6em;
}

.eyebrow::before {
  content: '';
  width: 18px;
  height: 1px;
  background: var(--signal);
  display: inline-block;
}

/* ============================================================
   LOADER
   ============================================================ */
#loader {
  position: fixed;
  inset: 0;
  background: var(--bg);
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  z-index: 9999;
  transition: opacity 0.6s var(--ease);
}

#loader.fade-out { opacity: 0; pointer-events: none; }

.spinner {
  width: 38px;
  height: 38px;
  border: 2px solid var(--line);
  border-top: 2px solid var(--signal);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
  margin-bottom: 22px;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

.loader-name {
  font-family: var(--mono);
  font-size: 0.85rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--text-dim);
}

/* ============================================================
   HEADER / NAV
   ============================================================ */
header {
  background: rgba(11, 12, 14, 0.85);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  padding: 0;
  position: sticky;
  top: 0;
  z-index: 100;
  border-bottom: 1px solid var(--line-soft);
}

nav {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0 1.5rem;
}

nav ul {
  display: flex;
  justify-content: center;
  list-style: none;
  flex-wrap: wrap;
  gap: 0.25rem;
  padding: 0.85rem 0;
}

nav ul li a {
  color: var(--text-dim);
  text-decoration: none;
  font-family: var(--mono);
  font-size: 0.82rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  padding: 0.6rem 1.1rem;
  border-radius: 999px;
  transition: color 0.25s var(--ease), background 0.25s var(--ease);
  white-space: nowrap;
  position: relative;
}

nav ul li a:hover {
  color: var(--text);
  background: var(--bg-raised);
}

nav ul li a.active,
nav ul li a[style] {
  color: var(--bg) !important;
  background: var(--signal) !important;
  text-shadow: none !important;
  font-size: 0.82rem !important;
}

/* ============================================================
   HERO / NAME SECTION
   ============================================================ */
.name {
  position: relative;
  text-align: left;
  padding: clamp(4rem, 10vw, 7.5rem) 1.5rem clamp(3rem, 7vw, 5rem);
  max-width: 1200px;
  margin: 0 auto;
  z-index: 1;
}

.name .eyebrow {
  margin-bottom: 1.5rem;
}

.name h1 {
  font-family: var(--display);
  font-weight: 700;
  font-size: clamp(2.6rem, 7.5vw, 5.2rem);
  line-height: 1.02;
  letter-spacing: -0.02em;
  color: var(--text);
  max-width: 16ch;
}

.name h1 .accent {
  color: var(--signal);
  font-style: normal;
}

.name h2 {
  font-family: var(--mono);
  font-weight: 400;
  font-size: clamp(0.95rem, 2vw, 1.15rem);
  color: var(--text-dim);
  margin-top: 1.5rem;
  max-width: 46ch;
  letter-spacing: 0.01em;
}

.name .role-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  margin-top: 2rem;
}

.role-tag {
  font-family: var(--mono);
  font-size: 0.75rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--text-dim);
  border: 1px solid var(--line);
  padding: 0.45rem 0.9rem;
  border-radius: 999px;
}

/* ============================================================
   ABOUT SECTION
   ============================================================ */
.about-wrapper {
  display: flex;
  align-items: stretch;
  justify-content: center;
  gap: 0;
  max-width: 1200px;
  margin: 2rem auto 6rem;
  padding: 0 1.5rem;
  flex-wrap: wrap;
}

.pro {
  flex: 0 0 320px;
  max-width: 320px;
  position: relative;
}

.pro::before {
  content: '01';
  position: absolute;
  top: -2.2rem;
  left: 0;
  font-family: var(--mono);
  font-size: 0.78rem;
  color: var(--text-faint);
  letter-spacing: 0.1em;
}

.pro img {
  width: 100%;
  height: 380px;
  object-fit: cover;
  border-radius: 4px;
  border: 1px solid var(--line);
  filter: grayscale(35%) contrast(1.05);
  transition: filter 0.5s var(--ease), transform 0.5s var(--ease);
}

.pro img:hover {
  filter: grayscale(0%) contrast(1.05);
  transform: translateY(-4px);
}

.about-text {
  flex: 1;
  min-width: 320px;
  display: flex;
  align-items: center;
  padding: 2.5rem 0 2.5rem 3rem;
  border-left: 1px solid var(--line);
  margin-left: 3rem;
  position: relative;
}

.about-text::before {
  content: '02';
  position: absolute;
  top: -2.2rem;
  left: 3rem;
  font-family: var(--mono);
  font-size: 0.78rem;
  color: var(--text-faint);
  letter-spacing: 0.1em;
}

.about-text p {
  font-size: 1.08rem;
  color: var(--text-dim);
  line-height: 1.85;
  font-weight: 400;
}

.about-text p strong {
  color: var(--text);
  font-weight: 600;
}

.about-text a {
  color: var(--signal);
  text-decoration: none;
  font-weight: 600;
  border-bottom: 1px solid var(--signal-dim);
  transition: opacity 0.25s var(--ease);
}

.about-text a:hover {
  opacity: 0.75;
}

@media (max-width: 860px) {
  .about-wrapper {
    flex-direction: column;
    margin-bottom: 4rem;
  }
  .pro {
    flex: 0 0 auto;
    max-width: 100%;
  }
  .pro img {
    height: 320px;
  }
  .about-text {
    margin-left: 0;
    padding: 2.5rem 0 0;
    border-left: none;
    border-top: 1px solid var(--line);
    margin-top: 2.5rem;
  }
  .about-text::before {
    left: 0;
    top: 1rem;
  }
}

/* ============================================================
   SECTION HEADERS (shared)
   ============================================================ */
.section-head {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1.5rem;
  text-align: left;
  margin-bottom: 3rem;
}

.skill, .prog {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1.5rem;
  text-align: left;
  overflow: visible;
}

.skill h2, .prog h2 {
  font-family: var(--display);
  font-weight: 700;
  font-size: clamp(1.8rem, 4vw, 2.6rem);
  letter-spacing: -0.01em;
  color: var(--text);
  margin-top: 0.6rem;
}

/* ============================================================
   DIGITAL SKILLS — signature element
   Three crafts, one operator. A connected system, not loose cards.
   ============================================================ */
.skills-graphic {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  max-width: 1200px;
  margin: 2.5rem auto 6rem;
  padding: 0;
  border-radius: 6px;
  overflow: hidden;
}

.skill-item {
  text-align: left;
  background: var(--bg-card);
  padding: 2.5rem 2rem;
  transition: background 0.35s var(--ease);
  position: relative;
  min-width: 0;
}

.skill-item:hover {
  background: var(--bg-raised);
}

.skill-item::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0%;
  height: 2px;
  background: var(--signal);
  transition: width 0.4s var(--ease);
}

.skill-item:hover::after {
  width: 100%;
}

.skill-icon {
  width: 44px;
  height: 44px;
  margin: 0 0 1.5rem;
  background: transparent;
  border: 1px solid var(--line);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  color: var(--signal);
  transition: border-color 0.3s var(--ease), transform 0.3s var(--ease);
}

.skill-item:hover .skill-icon {
  border-color: var(--signal);
  transform: translateY(-3px);
}

.web-dev .skill-icon::before {
  content: '</>';
  font-family: var(--mono);
  font-weight: 600;
  font-size: 0.95rem;
}

.video-edit .skill-icon::before {
  content: '▶';
  font-size: 0.9rem;
}

.graphic-design .skill-icon::before {
  content: '◆';
  font-size: 0.95rem;
}

.skill-title {
  font-family: var(--display);
  font-weight: 600;
  font-size: 1.2rem;
  color: var(--text);
  margin-bottom: 0.6rem;
  letter-spacing: -0.01em;
}

.skill-desc {
  font-family: var(--mono);
  font-size: 0.82rem;
  line-height: 1.6;
  color: var(--text-faint);
}

@media (max-width: 860px) {
  .skills-graphic {
    grid-template-columns: 1fr;
    margin-bottom: 4rem;
  }
}

/* ============================================================
   PROGRAMMING LANGUAGES / SKILL BARS
   ============================================================ */
.skill-container {
  max-width: 1200px;
  margin: 2.5rem auto 6rem;
  padding: 0 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 0;
}

.skill-container .skill-row {
  margin: 0;
  padding: 1.1rem 0;
  border-bottom: 1px solid var(--line-soft);
  display: grid;
  grid-template-columns: 140px 1fr 56px;
  align-items: center;
  gap: 1.25rem;
  text-align: left;
}

.skill-container .skill-row:first-of-type {
  border-top: 1px solid var(--line-soft);
}

.skill-name, .skill-name2 {
  display: block;
  margin-bottom: 0;
  font-family: var(--mono);
  font-weight: 500;
  color: var(--text);
  font-size: 0.92rem;
  letter-spacing: 0.02em;
}

.progress-bar {
  background: var(--line-soft);
  border-radius: 3px;
  height: 6px;
  overflow: hidden;
  position: relative;
}

.progress {
  height: 100%;
  border-radius: 3px;
  background: var(--signal);
  transition: width 1.4s var(--ease);
}

.progress.html { width: 0; animation: fillHTML 1.6s var(--ease) forwards 0.1s; }
.progress.css { width: 0; animation: fillCSS 1.6s var(--ease) forwards 0.25s; }
.progress.python { width: 0; animation: fillPython 1.6s var(--ease) forwards 0.4s; }
.progress.javascript { width: 0; animation: fillJS 1.6s var(--ease) forwards 0.55s; }
.progress.cpp { width: 0; animation: fillCPP 1.6s var(--ease) forwards 0.7s; }

@keyframes fillHTML { to { width: 98%; } }
@keyframes fillCSS { to { width: 95%; } }
@keyframes fillPython { to { width: 90%; } }
@keyframes fillJS { to { width: 90%; } }
@keyframes fillCPP { to { width: 80%; } }

.skill-pct {
  font-family: var(--mono);
  font-size: 0.82rem;
  color: var(--text-faint);
  text-align: right;
  font-variant-numeric: tabular-nums;
}

@media (max-width: 600px) {
  .skill-container .skill-row {
    grid-template-columns: 90px 1fr 40px;
    gap: 0.75rem;
  }
}

/* ============================================================
   SCROLL UP BUTTON
   ============================================================ */
#scrollUpBtn {
  position: fixed;
  bottom: 24px;
  right: 24px;
  background: var(--bg-card);
  color: var(--signal);
  border: 1px solid var(--line);
  border-radius: 50%;
  width: 46px;
  height: 46px;
  font-size: 1rem;
  cursor: pointer;
  display: none;
  align-items: center;
  justify-content: center;
  z-index: 99;
  transition: border-color 0.25s var(--ease), transform 0.25s var(--ease);
}

#scrollUpBtn:hover {
  border-color: var(--signal);
  transform: translateY(-3px);
}

/* ============================================================
   FOOTER
   ============================================================ */
hr {
  border: 0;
  height: 1px;
  background: var(--line-soft);
  margin: 0;
  max-width: 1200px;
  margin: 2rem auto 0;
}

.footer {
  text-align: center;
  padding: 3.5rem 1.5rem 3rem;
  max-width: 1200px;
  margin: 0 auto;
}

.footer-tag {
  font-family: var(--mono);
  font-size: 0.78rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--text-faint);
  margin-bottom: 1.75rem;
}

.social-icons {
  display: flex;
  justify-content: center;
  gap: 0.75rem;
  margin-bottom: 1.5rem;
  flex-wrap: wrap;
}

.social-icons div {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--bg-card);
  border: 1px solid var(--line);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: border-color 0.25s var(--ease), transform 0.25s var(--ease), color 0.25s var(--ease);
}

.social-icons div:hover {
  transform: translateY(-3px);
  border-color: var(--signal);
  color: var(--signal);
}

.social-icons i {
  font-size: 1.1rem;
  color: var(--text-dim);
  transition: color 0.25s var(--ease);
}

.social-icons div:hover i {
  color: var(--signal);
}

.ending {
  color: var(--text-faint);
  font-size: 0.85rem;
  font-family: var(--mono);
}

/* ============================================================
   AOS OVERRIDES
   ============================================================ */
[data-aos] {
  opacity: 0;
  transition-property: opacity, transform;
}

[data-aos].aos-animate {
  opacity: 1;
}

/* ============================================================
   RESPONSIVE
   ============================================================ */
@media (max-width: 768px) {
  nav ul {
    gap: 0.2rem;
  }
  nav ul li a {
    font-size: 0.72rem;
    padding: 0.5rem 0.75rem;
  }
}

@media (max-width: 480px) {
  .name {
    padding-top: 3rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
}