/* ---------------------------------------------------------------------------
   Rameen Zafar — portfolio stylesheet
   No frameworks, no build step. Custom properties drive the two themes.
   --------------------------------------------------------------------------- */

:root {
  color-scheme: light dark;

  --bg: #fbfaf8;
  --bg-alt: #f2f0ec;
  --surface: #ffffff;
  --border: #e2ddd5;
  --border-strong: #cfc8bd;

  --text: #1c1b19;
  --text-muted: #605c55;
  --text-faint: #8b857c;

  --accent: #0f766e;
  --accent-hover: #0b5f59;
  --accent-soft: rgba(15, 118, 110, 0.1);

  --font-sans: "Inter", ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;

  --wrap: 68rem;
  --radius: 10px;
  --radius-lg: 16px;

  --shadow-sm: 0 1px 2px rgba(28, 27, 25, 0.05);
  --shadow-md: 0 8px 24px -12px rgba(28, 27, 25, 0.18);

  --ease: cubic-bezier(0.4, 0, 0.2, 1);
}

[data-theme="dark"] {
  --bg: #131313;
  --bg-alt: #191919;
  --surface: #1d1d1d;
  --border: #2e2e2e;
  --border-strong: #414141;

  --text: #ededea;
  --text-muted: #a5a29b;
  --text-faint: #7b7871;

  --accent: #2dd4bf;
  --accent-hover: #5eead4;
  --accent-soft: rgba(45, 212, 191, 0.12);

  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.4);
  --shadow-md: 0 8px 24px -12px rgba(0, 0, 0, 0.7);
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  transition: background-color 0.25s var(--ease), color 0.25s var(--ease);
}

h1, h2, h3 {
  margin: 0;
  line-height: 1.15;
  letter-spacing: -0.02em;
  font-weight: 650;
}

p { margin: 0; }
ul, ol, dl { margin: 0; padding: 0; list-style: none; }
a { color: inherit; }

img, svg { max-width: 100%; }

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 4px;
}

.wrap {
  width: 100%;
  max-width: var(--wrap);
  margin-inline: auto;
  padding-inline: 1.5rem;
}

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  z-index: 100;
  background: var(--accent);
  color: #fff;
  padding: 0.65rem 1.1rem;
  border-radius: 0 0 var(--radius) 0;
  text-decoration: none;
  font-weight: 600;
}
.skip-link:focus { left: 0; }

/* --- Header ---------------------------------------------------------------- */

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: saturate(1.6) blur(12px);
  border-bottom: 1px solid transparent;
  transition: border-color 0.2s var(--ease);
}
.site-header.is-scrolled { border-bottom-color: var(--border); }

.nav {
  max-width: var(--wrap);
  margin-inline: auto;
  padding: 0.9rem 1.5rem;
  display: flex;
  align-items: center;
  gap: 1rem;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  text-decoration: none;
  font-weight: 620;
  letter-spacing: -0.01em;
  margin-right: auto;
}

.brand-mark {
  display: grid;
  place-items: center;
  width: 2rem;
  height: 2rem;
  border-radius: 8px;
  background: var(--accent);
  color: #fff;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.02em;
}
[data-theme="dark"] .brand-mark { color: #0c1413; }

.nav-menu {
  display: flex;
  align-items: center;
  gap: 1.6rem;
  font-size: 0.9rem;
}

.nav-menu a {
  text-decoration: none;
  color: var(--text-muted);
  transition: color 0.15s var(--ease);
}
.nav-menu a:hover,
.nav-menu a.is-active { color: var(--text); }

.theme-toggle {
  display: grid;
  place-items: center;
  width: 2.1rem;
  height: 2.1rem;
  margin-left: 1.2rem;
  padding: 0;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: transparent;
  color: var(--text-muted);
  cursor: pointer;
  transition: color 0.15s var(--ease), border-color 0.15s var(--ease);
}
.theme-toggle:hover { color: var(--text); border-color: var(--border-strong); }

.theme-toggle svg {
  width: 1.05rem;
  height: 1.05rem;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.7;
  stroke-linecap: round;
  stroke-linejoin: round;
}
.icon-moon { display: none; }
[data-theme="dark"] .icon-sun { display: none; }
[data-theme="dark"] .icon-moon { display: block; }

.nav-toggle {
  display: none;
  width: 2.1rem;
  height: 2.1rem;
  padding: 0;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: transparent;
  cursor: pointer;
}
.nav-toggle-bar {
  display: block;
  width: 1rem;
  height: 1.5px;
  margin: 0.22rem auto;
  background: var(--text);
  transition: transform 0.2s var(--ease), opacity 0.2s var(--ease);
}
.nav-toggle[aria-expanded="true"] .nav-toggle-bar:first-child { transform: translateY(3px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle-bar:last-child { transform: translateY(-3px) rotate(-45deg); }

/* --- Hero ------------------------------------------------------------------ */

.hero {
  padding-block: clamp(4rem, 12vw, 8rem) clamp(3rem, 8vw, 5.5rem);
  border-bottom: 1px solid var(--border);
  background-image: radial-gradient(60rem 30rem at 15% -10%, var(--accent-soft), transparent 70%);
}

.hero-inner { max-width: 46rem; }

.eyebrow {
  display: inline-block;
  margin-bottom: 1.4rem;
  padding: 0.3rem 0.75rem;
  border: 1px solid var(--border-strong);
  border-radius: 999px;
  font-size: 0.78rem;
  font-weight: 500;
  color: var(--text-muted);
  letter-spacing: 0.01em;
}

.hero h1 {
  font-size: clamp(2.4rem, 6.5vw, 4rem);
  margin-bottom: 1.5rem;
}
.accent { color: var(--accent); }

.lede {
  font-size: clamp(1.02rem, 1.9vw, 1.15rem);
  color: var(--text-muted);
  max-width: 40rem;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 2.2rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.7rem 1.35rem;
  border: 1px solid transparent;
  border-radius: var(--radius);
  font: inherit;
  font-size: 0.94rem;
  font-weight: 550;
  text-decoration: none;
  cursor: pointer;
  transition: background-color 0.15s var(--ease), border-color 0.15s var(--ease),
              color 0.15s var(--ease), transform 0.15s var(--ease);
}
.btn:active { transform: translateY(1px); }

.btn-primary { background: var(--accent); color: #fff; }
.btn-primary:hover { background: var(--accent-hover); }
[data-theme="dark"] .btn-primary { color: #0c1413; }

.btn-ghost { border-color: var(--border-strong); color: var(--text); }
.btn-ghost:hover { border-color: var(--text-faint); background: var(--bg-alt); }

.btn[disabled] { opacity: 0.55; cursor: not-allowed; transform: none; }

.stat-row {
  display: flex;
  flex-wrap: wrap;
  gap: 2.5rem;
  margin-top: 3.5rem;
  padding-top: 1.8rem;
  border-top: 1px solid var(--border);
}
.stat dt {
  font-size: 0.76rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-faint);
  margin-bottom: 0.3rem;
}
.stat dd {
  margin: 0;
  font-size: 0.95rem;
  font-weight: 550;
}

/* --- Sections -------------------------------------------------------------- */

.section { padding-block: clamp(3.5rem, 9vw, 6rem); }
.section-alt {
  background: var(--bg-alt);
  border-block: 1px solid var(--border);
}

.section-label {
  font-family: var(--font-mono);
  font-size: 0.76rem;
  letter-spacing: 0.06em;
  color: var(--accent);
  margin-bottom: 1rem;
}

.section h2 {
  font-size: clamp(1.65rem, 4vw, 2.3rem);
  max-width: 24ch;
}

.section-intro {
  margin-top: 1rem;
  max-width: 52ch;
  color: var(--text-muted);
}

.about-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1.15fr);
  gap: clamp(2rem, 5vw, 4rem);
  align-items: start;
}

.prose {
  display: grid;
  gap: 1.1rem;
  color: var(--text-muted);
}

/* --- Cards ----------------------------------------------------------------- */

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(16rem, 1fr));
  gap: 1rem;
  margin-top: 2.5rem;
}

.card {
  padding: 1.5rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  transition: border-color 0.2s var(--ease), box-shadow 0.2s var(--ease), transform 0.2s var(--ease);
}
.card:hover {
  border-color: var(--border-strong);
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.card h3 {
  font-size: 1.02rem;
  margin-bottom: 0.55rem;
}
.card p {
  font-size: 0.92rem;
  color: var(--text-muted);
}

.tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-top: 1.1rem;
}
.tag-list li {
  padding: 0.22rem 0.6rem;
  border: 1px solid var(--border);
  border-radius: 999px;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--text-faint);
  white-space: nowrap;
}

/* --- Work ------------------------------------------------------------------ */

.work-list {
  margin-top: 2.5rem;
  border-top: 1px solid var(--border);
}

.work-item {
  display: grid;
  grid-template-columns: 11rem minmax(0, 1fr);
  gap: 2rem;
  padding-block: 2.2rem;
  border-bottom: 1px solid var(--border);
}

.work-meta {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}
.work-index {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-faint);
}
.work-tag {
  font-size: 0.78rem;
  font-weight: 550;
  color: var(--accent);
}

.work-body h3 {
  font-size: 1.25rem;
  margin-bottom: 0.6rem;
}
.work-body p {
  color: var(--text-muted);
  max-width: 60ch;
}

/* --- Flow ------------------------------------------------------------------ */

.flow {
  counter-reset: flow;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(13rem, 1fr));
  gap: 1rem;
  margin-top: 2.5rem;
}

.flow-step {
  counter-increment: flow;
  position: relative;
  padding: 1.5rem 1.25rem 1.25rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
}
.flow-step::before {
  content: counter(flow);
  position: absolute;
  top: -0.7rem;
  left: 1.25rem;
  display: grid;
  place-items: center;
  width: 1.5rem;
  height: 1.5rem;
  border-radius: 999px;
  background: var(--accent);
  color: #fff;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 600;
}
[data-theme="dark"] .flow-step::before { color: #0c1413; }

.flow-step h3 {
  font-size: 0.98rem;
  margin-bottom: 0.4rem;
}
.flow-step p {
  font-size: 0.88rem;
  color: var(--text-muted);
}

/* --- Contact --------------------------------------------------------------- */

.contact-wrap { max-width: 46rem; }

.contact-form {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  margin-top: 2.2rem;
}
.field { display: grid; gap: 0.4rem; }
.field-full { grid-column: 1 / -1; }

.field label {
  font-size: 0.84rem;
  font-weight: 550;
  color: var(--text-muted);
}

.field input,
.field textarea {
  width: 100%;
  padding: 0.65rem 0.8rem;
  border: 1px solid var(--border-strong);
  border-radius: var(--radius);
  background: var(--surface);
  color: var(--text);
  font: inherit;
  font-size: 0.94rem;
  resize: vertical;
  transition: border-color 0.15s var(--ease), box-shadow 0.15s var(--ease);
}
.field input:focus,
.field textarea:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-soft);
}
.field input[aria-invalid="true"],
.field textarea[aria-invalid="true"] { border-color: #dc2626; }

.form-footer {
  grid-column: 1 / -1;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 1rem;
}

.form-status {
  font-size: 0.88rem;
  color: var(--text-muted);
}
.form-status.is-ok { color: var(--accent); }
.form-status.is-error { color: #dc2626; }
[data-theme="dark"] .form-status.is-error { color: #f87171; }

.contact-direct {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.6rem;
  margin-top: 2.5rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border);
  color: var(--text-muted);
  font-size: 0.92rem;
}

.mono-link {
  font-family: var(--font-mono);
  font-size: 0.9rem;
  color: var(--text);
  text-decoration: none;
  border-bottom: 1px solid var(--border-strong);
  padding-bottom: 1px;
  transition: color 0.15s var(--ease), border-color 0.15s var(--ease);
}
.mono-link:hover { color: var(--accent); border-color: var(--accent); }

/* --- Footer ---------------------------------------------------------------- */

.site-footer {
  padding-block: 2.5rem;
  border-top: 1px solid var(--border);
  background: var(--bg-alt);
  font-size: 0.86rem;
  color: var(--text-muted);
}
.footer-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 1rem 2rem;
}
.footer-links {
  display: flex;
  gap: 1.2rem;
}
.footer-links a {
  text-decoration: none;
  transition: color 0.15s var(--ease);
}
.footer-links a:hover { color: var(--accent); }
.footer-note {
  margin-left: auto;
  font-size: 0.8rem;
  color: var(--text-faint);
}

/* --- Reveal on scroll ------------------------------------------------------ */

.reveal {
  opacity: 0;
  transform: translateY(12px);
  transition: opacity 0.5s var(--ease), transform 0.5s var(--ease);
}
.reveal.is-visible {
  opacity: 1;
  transform: none;
}

/* --- Responsive ------------------------------------------------------------ */

@media (max-width: 780px) {
  .nav-toggle { display: block; order: 3; }
  .theme-toggle { margin-left: 0.4rem; order: 2; }

  .nav-menu {
    order: 4;
    flex-basis: 100%;
    flex-direction: column;
    align-items: flex-start;
    gap: 0.1rem;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.25s var(--ease);
  }
  .nav-menu.is-open {
    max-height: 18rem;
    padding-block: 0.8rem 0.4rem;
  }
  .nav-menu li { width: 100%; }
  .nav-menu a {
    display: block;
    padding: 0.55rem 0;
    font-size: 0.95rem;
  }
  .nav { flex-wrap: wrap; }

  .about-grid { grid-template-columns: 1fr; }
  .work-item { grid-template-columns: 1fr; gap: 0.9rem; }
  .work-meta { flex-direction: row; align-items: center; gap: 0.8rem; }
  .contact-form { grid-template-columns: 1fr; }
  .stat-row { gap: 1.5rem 2rem; }
  .footer-note { margin-left: 0; flex-basis: 100%; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
  .reveal { opacity: 1; transform: none; }
}