/* ═══════════════════════════════════════════════════
   USFAN ALI KHAN — PORTFOLIO STYLESHEET
   File: css/style.css
═══════════════════════════════════════════════════ */

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

/* ══════════════════════════════════════
   THEME TOKENS
══════════════════════════════════════ */
[data-theme="dark"] {
  --bg:           #0c0c12;
  --bg2:          #12121a;
  --bg3:          #171720;
  --border:       rgba(255,255,255,0.08);
  --text:         #eeeef5;
  --sub:          #9898b0;
  --dim:          #5a5a72;
  --acc1:         #6366f1;
  --acc2:         #a78bfa;
  --acc-glow:     rgba(99,102,241,0.20);
  --pill-bg:      rgba(99,102,241,0.12);
  --pill-txt:     #a5b4fc;
  --pill-bdr:     rgba(99,102,241,0.28);
  --tag-bg:       rgba(255,255,255,0.05);
  --tag-txt:      #7878a0;
  --card-hover:   #1a1a26;
  --nav-bg:       rgba(12,12,18,0.90);
  --toggle-bg:    #1e1e2e;
  --toggle-thumb: #6366f1;
  --menu-bg:      #13131c;
  --menu-border:  rgba(255,255,255,0.09);

  /* form specific */
  --input-bg:     #12121a;
  --input-border: rgba(255,255,255,0.10);
  --input-focus:  #6366f1;
  --err:          #f87171;
  --err-bg:       rgba(248,113,113,0.10);
  --err-bdr:      rgba(248,113,113,0.28);
  --ok:           #4ade80;
  --ok-bg:        rgba(74,222,128,0.10);
  --ok-bdr:       rgba(74,222,128,0.28);
}

[data-theme="light"] {
  --bg:           #f5f0e8;
  --bg2:          #faf6ef;
  --bg3:          #ede7d9;
  --border:       rgba(160,130,90,0.18);
  --text:         #2a1f0e;
  --sub:          #7a6248;
  --dim:          #b09878;
  --acc1:         #7c5c2a;
  --acc2:         #a07840;
  --acc-glow:     rgba(124,92,42,0.13);
  --pill-bg:      rgba(124,92,42,0.10);
  --pill-txt:     #7c5c2a;
  --pill-bdr:     rgba(124,92,42,0.24);
  --tag-bg:       rgba(124,92,42,0.07);
  --tag-txt:      #8a6840;
  --card-hover:   #ede7d9;
  --nav-bg:       rgba(245,240,232,0.93);
  --toggle-bg:    #d9cebc;
  --toggle-thumb: #7c5c2a;
  --menu-bg:      #f5f0e8;
  --menu-border:  rgba(160,130,90,0.18);

  /* form specific */
  --input-bg:     #faf6ef;
  --input-border: rgba(160,130,90,0.22);
  --input-focus:  #7c5c2a;
  --err:          #dc2626;
  --err-bg:       rgba(220,38,38,0.07);
  --err-bdr:      rgba(220,38,38,0.22);
  --ok:           #16a34a;
  --ok-bg:        rgba(22,163,74,0.08);
  --ok-bdr:       rgba(22,163,74,0.22);
}

/* ══════════════════════════════════════
   BASE
══════════════════════════════════════ */
html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: 'DM Sans', sans-serif;
  font-size: 15.5px;
  line-height: 1.6;
  transition: background .28s, color .28s;
  overflow-x: hidden;
}

/* ══════════════════════════════════════
   NAV
══════════════════════════════════════ */
nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 200;
  display: flex; align-items: center; justify-content: space-between;
  padding: 0 6vw; height: 62px;
  background: var(--nav-bg);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  border-bottom: 1px solid var(--border);
  transition: background .28s, border-color .28s;
}

.nav-wordmark {
  font-family: 'Playfair Display', serif;
  font-weight: 700; font-size: 1.05rem;
  color: var(--text); letter-spacing: -0.01em;
  text-decoration: none;
}

.nav-right { display: flex; align-items: center; gap: 1.2rem; }

.nav-links { display: flex; gap: 1.7rem; list-style: none; }
.nav-links a {
  text-decoration: none; color: var(--sub);
  font-size: 0.82rem; font-weight: 500;
  transition: color .18s;
}
.nav-links a:hover { color: var(--text); }

/* ── Theme Toggle ── */
.toggle {
  width: 44px; height: 24px;
  background: var(--toggle-bg);
  border: 1px solid var(--border);
  border-radius: 12px;
  cursor: pointer; position: relative;
  flex-shrink: 0; outline: none;
  transition: background .22s;
}
.toggle::after {
  content: '';
  position: absolute; top: 3px; left: 3px;
  width: 16px; height: 16px; border-radius: 50%;
  background: var(--toggle-thumb);
  transition: transform .22s, background .22s;
}
[data-theme="light"] .toggle::after { transform: translateX(20px); }

/* ── Hamburger ── */
.hamburger {
  display: none; flex-direction: column; gap: 5px;
  cursor: pointer; padding: 4px;
  background: none; border: none; outline: none;
}
.hamburger span {
  display: block; width: 22px; height: 2px;
  background: var(--text); border-radius: 2px;
  transition: background .2s, transform .22s, opacity .18s;
}
.hamburger.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.hamburger.open span:nth-child(2) { opacity: 0; }
.hamburger.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ── Mobile Menu ── */
.mobile-menu {
  display: none;
  position: fixed; top: 62px; left: 0; right: 0; z-index: 190;
  background: var(--menu-bg);
  border-bottom: 1px solid var(--menu-border);
  padding: 1.2rem 6vw 1.5rem;
  flex-direction: column; gap: 0;
  box-shadow: 0 8px 24px rgba(0,0,0,0.12);
  transition: background .28s;
}
.mobile-menu.open { display: flex; }
.mobile-menu a {
  text-decoration: none; color: var(--sub);
  font-size: 0.92rem; font-weight: 500;
  padding: 0.7rem 0;
  border-bottom: 1px solid var(--border);
  transition: color .18s;
}
.mobile-menu a:last-child { border-bottom: none; }
.mobile-menu a:hover { color: var(--text); }

/* ══════════════════════════════════════
   HERO
══════════════════════════════════════ */
#home {
  min-height: 100vh;
  display: flex; align-items: center;
  padding: 110px 6vw 6vw;
  position: relative; overflow: hidden;
}
.hero-blob {
  position: absolute; right: -8vw; top: 8vh;
  width: 52vw; height: 52vw;
  max-width: 650px; max-height: 650px;
  border-radius: 50%;
  background: radial-gradient(circle at center, var(--acc-glow) 0%, transparent 65%);
  pointer-events: none; z-index: 0;
}
.hero-content { position: relative; z-index: 1; max-width: 660px; }

.hero-badge {
  display: inline-flex; align-items: center; gap: 0.5rem;
  padding: 0.3rem 0.85rem;
  background: var(--pill-bg); border: 1px solid var(--pill-bdr);
  border-radius: 2rem; margin-bottom: 1.8rem;
  font-size: 0.76rem; font-weight: 500; color: var(--pill-txt);
}
.hero-dot {
  width: 6px; height: 6px; border-radius: 50%;
  background: var(--acc1);
  animation: blink 2s ease-in-out infinite;
}
@keyframes blink { 0%,100%{opacity:1} 50%{opacity:.3} }

.hero-name {
  font-family: 'Playfair Display', serif;
  font-size: clamp(2.5rem, 5.5vw, 4.2rem);
  font-weight: 800; line-height: 1.08;
  letter-spacing: -0.03em; color: var(--text);
  margin-bottom: 1rem;
}
.hero-tagline {
  font-size: 1.02rem; font-weight: 300;
  color: var(--sub); max-width: 480px;
  line-height: 1.78; margin-bottom: 2.2rem;
}
.hero-actions { display: flex; gap: 0.9rem; flex-wrap: wrap; }

.btn-solid {
  padding: 0.72rem 1.55rem;
  background: var(--acc1); color: #fff;
  border: none; border-radius: 0.45rem;
  font-family: 'DM Sans', sans-serif;
  font-size: 0.88rem; font-weight: 500;
  text-decoration: none; cursor: pointer;
  transition: opacity .18s, transform .15s;
  display: inline-block;
}
.btn-solid:hover { opacity: 0.84; transform: translateY(-2px); }

.btn-outline {
  padding: 0.72rem 1.55rem;
  background: transparent; color: var(--text);
  border: 1px solid var(--border); border-radius: 0.45rem;
  font-family: 'DM Sans', sans-serif;
  font-size: 0.88rem; font-weight: 500;
  text-decoration: none; cursor: pointer;
  transition: border-color .18s, transform .15s;
  display: inline-block;
}
.btn-outline:hover { border-color: var(--acc1); transform: translateY(-2px); }

.hero-contacts {
  display: flex; gap: 1.4rem; flex-wrap: wrap;
  margin-top: 2.8rem; padding-top: 2.4rem;
  border-top: 1px solid var(--border);
}
.hero-contact-item {
  font-size: 0.8rem; color: var(--sub);
  text-decoration: none; transition: color .18s;
}
.hero-contact-item:hover { color: var(--text); }

/* ══════════════════════════════════════
   SECTION SHELLS
══════════════════════════════════════ */
.section { padding: 5.5rem 6vw; }
.section-alt { background: var(--bg2); }
.section-head { margin-bottom: 2.6rem; }

.s-label {
  font-size: 0.72rem; font-weight: 600;
  letter-spacing: 0.07em; color: var(--acc1);
  margin-bottom: 0.55rem;
}
.s-title {
  font-family: 'Playfair Display', serif;
  font-size: clamp(1.65rem, 3vw, 2.3rem);
  font-weight: 700; letter-spacing: -0.025em;
  color: var(--text); line-height: 1.15;
}

/* ══════════════════════════════════════
   SKILLS
══════════════════════════════════════ */
.skills-cols {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(215px, 1fr));
  gap: 1.3rem;
}
.skill-group {
  background: var(--bg); border: 1px solid var(--border);
  border-radius: 0.7rem; padding: 1.3rem 1.25rem;
  transition: background .2s, border-color .2s;
}
.skill-group:hover { background: var(--card-hover); border-color: var(--pill-bdr); }
.sg-head { font-size: 0.75rem; font-weight: 600; color: var(--acc1); margin-bottom: 0.7rem; }
.sg-items { display: flex; flex-wrap: wrap; gap: 0.38rem; }
.sk-tag {
  background: var(--tag-bg); color: var(--tag-txt);
  font-size: 0.74rem; font-weight: 500;
  padding: 0.2rem 0.58rem;
  border-radius: 0.3rem; border: 1px solid var(--border);
}

/* ══════════════════════════════════════
   EDUCATION
══════════════════════════════════════ */
.edu-card {
  background: var(--bg2); border: 1px solid var(--border);
  border-radius: 0.75rem; padding: 1.8rem 2rem;
  display: flex; gap: 1.8rem; align-items: flex-start;
  max-width: 680px;
}
.edu-icon {
  width: 48px; height: 48px; border-radius: 0.5rem;
  background: var(--pill-bg); border: 1px solid var(--pill-bdr);
  display: flex; align-items: center; justify-content: center;
  font-size: 1.4rem; flex-shrink: 0;
}
.edu-uni {
  font-family: 'Playfair Display', serif;
  font-size: 1.05rem; font-weight: 700; color: var(--text);
  margin-bottom: 0.25rem;
}
.edu-degree { font-size: 0.88rem; color: var(--sub); margin-bottom: 0.7rem; }
.edu-chips { display: flex; gap: 0.5rem; flex-wrap: wrap; }
.edu-chip {
  background: var(--pill-bg); border: 1px solid var(--pill-bdr);
  color: var(--pill-txt); font-size: 0.73rem; font-weight: 500;
  padding: 0.2rem 0.6rem; border-radius: 0.3rem;
}

/* ══════════════════════════════════════
   EXPERIENCE
══════════════════════════════════════ */
.exp-block {
  background: var(--bg2); border: 1px solid var(--border);
  border-radius: 0.75rem; padding: 1.8rem 2rem;
}
.exp-top {
  display: flex; justify-content: space-between;
  align-items: flex-start; flex-wrap: wrap;
  gap: 0.5rem; margin-bottom: 0.4rem;
}
.exp-role {
  font-family: 'Playfair Display', serif;
  font-size: 1.1rem; font-weight: 700; color: var(--text);
}
.exp-date {
  font-size: 0.74rem; font-weight: 500; color: var(--pill-txt);
  background: var(--pill-bg); border: 1px solid var(--pill-bdr);
  border-radius: 2rem; padding: 0.2rem 0.7rem; white-space: nowrap;
}
.exp-company { font-size: 0.86rem; color: var(--sub); margin-bottom: 1rem; }
.exp-bullets { list-style: none; display: flex; flex-direction: column; gap: 0.5rem; }
.exp-bullets li {
  font-size: 0.87rem; color: var(--sub); line-height: 1.62;
  padding-left: 1.1rem; position: relative;
}
.exp-bullets li::before {
  content: ''; position: absolute; left: 0; top: 0.62em;
  width: 5px; height: 5px; border-radius: 50%; background: var(--acc1);
}

/* ══════════════════════════════════════
   PROJECTS
══════════════════════════════════════ */
.projects-list { display: flex; flex-direction: column; gap: 1.4rem; }

.proj-card {
  background: var(--bg2); border: 1px solid var(--border);
  border-radius: 0.75rem; padding: 1.7rem 2rem;
  position: relative; overflow: hidden;
  transition: background .2s, border-color .2s, transform .18s;
}
.proj-card::before {
  content: ''; position: absolute; left: 0; top: 0; bottom: 0; width: 3px;
  background: linear-gradient(180deg, var(--acc1), var(--acc2));
  opacity: 0; transition: opacity .2s;
}
.proj-card:hover { background: var(--card-hover); border-color: var(--pill-bdr); transform: translateX(4px); }
.proj-card:hover::before { opacity: 1; }

.proj-title {
  font-family: 'Playfair Display', serif;
  font-size: 1.05rem; font-weight: 700; color: var(--text);
  margin-bottom: 0.5rem; line-height: 1.3;
}
.proj-desc { font-size: 0.86rem; color: var(--sub); line-height: 1.65; margin-bottom: 0.9rem; }
.proj-stack { display: flex; flex-wrap: wrap; gap: 0.38rem; }

/* ══════════════════════════════════════
   CERTIFICATIONS
══════════════════════════════════════ */
.certs-row { display: flex; gap: 1.2rem; flex-wrap: wrap; }
.cert-item {
  background: var(--bg2); border: 1px solid var(--border);
  border-radius: 0.65rem; padding: 1.2rem 1.4rem;
  flex: 1; min-width: 210px;
  transition: background .2s, border-color .2s;
}
.cert-item:hover { background: var(--card-hover); border-color: var(--pill-bdr); }
.cert-name { font-size: 0.9rem; font-weight: 600; color: var(--text); margin-bottom: 0.25rem; }
.cert-org  { font-size: 0.78rem; color: var(--sub); }

/* ══════════════════════════════════════
   CONTACT
══════════════════════════════════════ */
.contact-grid {
  display: grid; grid-template-columns: 1fr 1fr;
  gap: 4rem; align-items: start;
}
.contact-blurb {
  font-size: 0.93rem; color: var(--sub);
  line-height: 1.8; margin-bottom: 1.8rem;
}
.contact-items { display: flex; flex-direction: column; gap: 0.7rem; }
.contact-row {
  display: flex; align-items: center; gap: 0.9rem;
  padding: 0.85rem 1.1rem;
  background: var(--bg); border: 1px solid var(--border);
  border-radius: 0.6rem; text-decoration: none; color: var(--text);
  font-size: 0.86rem; transition: border-color .18s, background .18s;
}
.contact-row:hover { border-color: var(--acc1); background: var(--card-hover); }
.cr-meta { display: flex; flex-direction: column; gap: 0.1rem; }
.cr-label { font-size: 0.7rem; color: var(--dim); }
.cr-val   { font-weight: 500; }
.cr-icon  { font-size: 1.1rem; flex-shrink: 0; }

/* ── .cont wrapper (Web3Forms) ── */
.cont {
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: 0.9rem;
  padding: 2rem 2rem;
}

/* ══════════════════════════════════════
   WEB3FORMS — CONTACT FORM
══════════════════════════════════════ */
#contactForm {
  display: flex; flex-direction: column; gap: 1.1rem;
}

.cf-row {
  display: grid; grid-template-columns: 1fr 1fr; gap: 1rem;
}

.cf-group {
  display: flex; flex-direction: column; gap: 0.38rem;
}

.cf-group label {
  font-size: 0.75rem; font-weight: 600;
  color: var(--sub); letter-spacing: 0.01em;
}

.req { color: var(--acc1); }
.opt { font-size: 0.7rem; color: var(--dim); font-weight: 400; }

.cf-group input,
.cf-group textarea {
  background: var(--input-bg);
  border: 1px solid var(--input-border);
  border-radius: 0.45rem;
  padding: 0.72rem 0.95rem;
  color: var(--text);
  font-family: 'DM Sans', sans-serif;
  font-size: 0.88rem;
  outline: none;
  transition: border-color .2s, background .25s, box-shadow .2s;
  width: 100%;
}
.cf-group input::placeholder,
.cf-group textarea::placeholder {
  color: var(--dim);
}
.cf-group input:focus,
.cf-group textarea:focus {
  border-color: var(--input-focus);
  box-shadow: 0 0 0 3px rgba(99,102,241,0.12);
}
[data-theme="light"] .cf-group input:focus,
[data-theme="light"] .cf-group textarea:focus {
  box-shadow: 0 0 0 3px rgba(124,92,42,0.10);
}

/* validation states */
.cf-group input.field-err,
.cf-group textarea.field-err {
  border-color: var(--err);
}
.cf-group input.field-ok,
.cf-group textarea.field-ok {
  border-color: var(--ok);
}

.cf-group textarea {
  resize: vertical; min-height: 120px;
}

/* ── Submit button ── */
.cf-submit {
  width: 100%; border: none; border-radius: 0.48rem;
  font-family: 'DM Sans', sans-serif;
  font-size: 0.92rem; font-weight: 600;
  padding: 0.88rem 1.2rem;
  cursor: pointer;
  background: var(--acc1); color: #fff;
  display: flex; align-items: center; justify-content: center; gap: 0.6rem;
  transition: opacity .18s, transform .15s;
  letter-spacing: 0.01em;
}
.cf-submit:hover:not(:disabled) { opacity: 0.85; transform: translateY(-1px); }
.cf-submit:disabled { opacity: 0.58; cursor: not-allowed; transform: none; }

/* ── Spinner inside button ── */
.cf-spinner {
  width: 16px; height: 16px; border-radius: 50%;
  border: 2px solid rgba(255,255,255,0.35);
  border-top-color: #fff;
  animation: spin .65s linear infinite;
  display: none;
  flex-shrink: 0;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* ── Toast notification ── */
.cf-toast {
  display: none;
  align-items: center; gap: 0.65rem;
  padding: 0.8rem 1rem;
  border-radius: 0.48rem;
  font-size: 0.85rem; font-weight: 500;
  border: 1px solid transparent;
}
.cf-toast.show  { display: flex; animation: toastIn .3s ease; }
.cf-toast.ok    { background: var(--ok-bg);  border-color: var(--ok-bdr);  color: var(--ok);  }
.cf-toast.err   { background: var(--err-bg); border-color: var(--err-bdr); color: var(--err); }
@keyframes toastIn {
  from { opacity:0; transform:translateY(-6px); }
  to   { opacity:1; transform:translateY(0);    }
}
.cf-toast-icon { font-size: 1rem; flex-shrink: 0; }

/* ══════════════════════════════════════
   FOOTER
══════════════════════════════════════ */
footer {
  background: var(--bg2); border-top: 1px solid var(--border);
  padding: 1.8rem 6vw;
  display: flex; justify-content: space-between; align-items: center;
  flex-wrap: wrap; gap: 1rem;
  transition: background .28s;
}
.footer-left  { font-size: 0.79rem; color: var(--dim); }
.footer-links { display: flex; gap: 1.4rem; }
.footer-links a {
  text-decoration: none; font-size: 0.79rem; color: var(--sub);
  transition: color .18s;
}
.footer-links a:hover { color: var(--text); }

/* ══════════════════════════════════════
   SCROLL REVEAL
══════════════════════════════════════ */
.reveal {
  opacity: 0; transform: translateY(18px);
  transition: opacity .5s ease, transform .5s ease;
}
.reveal.in { opacity: 1; transform: none; }

/* ══════════════════════════════════════
   RESPONSIVE
══════════════════════════════════════ */
@media (max-width: 900px) {
  .contact-grid { grid-template-columns: 1fr; gap: 2.5rem; }
}

@media (max-width: 768px) {
  nav { padding: 0 5vw; }
  .nav-links { display: none; }
  .hamburger { display: flex; }
  .section { padding: 4rem 5vw; }
  .cf-row { grid-template-columns: 1fr; }
  footer { flex-direction: column; align-items: flex-start; }
  .edu-card { flex-direction: column; gap: 1rem; }
  .cont { padding: 1.4rem 1.2rem; }
}

@media (max-width: 480px) {
  .hero-name { font-size: 2.2rem; }
  .certs-row { flex-direction: column; }
}