/* ============================================================
   JASHANPREET SINGH — PORTFOLIO  |  app.css
   Full responsive — buttons, text, layout all fixed
   ============================================================ */

   :root {
    --bg:     #0b0f1a;
    --stroke: rgba(255,255,255,.10);
    --text:   #eaf0ff;
    --muted:  #aab6d6;
    --accent: #2dd4bf;
    --accent2:#6366f1;
    --radius: 16px;
    --shadow: 0 18px 45px rgba(0,0,0,.35);
  }
  
  /*  RESET  */
  *, *::before, *::after { box-sizing: border-box; }
  html, body { max-width: 100%; overflow-x: hidden; }
  body {
    margin: 0;
    color: var(--text);
    font-family: system-ui, -apple-system, Segoe UI, Roboto, Arial, sans-serif;
    line-height: 1.6;
    background:
      radial-gradient(900px 500px at 20% 0%,  rgba(45,212,191,.12), transparent 60%),
      radial-gradient(800px 500px at 90% 10%, rgba(99,102,241,.10), transparent 55%),
      var(--bg);
  }
  img, svg { max-width: 100%; height: auto; display: block; }
  a { color: inherit; }
  
  /* 
     HEADER
   */
  .topbar {
    position: sticky; top: 0; z-index: 500;
    backdrop-filter: blur(14px);
    -webkit-backdrop-filter: blur(14px);
    background: rgba(11,15,26,.93);
    border-bottom: 1px solid var(--stroke);
  }
  .topbar-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 15px 0;
    position: relative;
  }
  .brand {
    font-weight: 800; font-size: 17px;
    text-decoration: none;
    color: var(--accent);
    white-space: nowrap; letter-spacing: -.2px;
    flex-shrink: 0;
  }
  
  /* Desktop nav */
  .sitenav { display: flex; align-items: center; gap: 4px; }
  .snav-link {
    color: var(--muted);
    font-weight: 600; font-size: 14px;
    padding: 8px 16px; border-radius: 10px;
    text-decoration: none;
    transition: color .15s, background .15s;
    white-space: nowrap;
  }
  .snav-link:hover { color: var(--text); background: rgba(255,255,255,.07); }
  
  /* Hamburger — hidden desktop */
  .hbg {
    display: none;
    flex-direction: column; justify-content: center; gap: 5px;
    width: 42px; height: 42px;
    background: rgba(255,255,255,.07);
    border: 1px solid rgba(255,255,255,.12);
    border-radius: 10px; cursor: pointer; padding: 9px;
    flex-shrink: 0;
    transition: background .2s, border-color .2s;
  }
  .hbg:hover { background: rgba(45,212,191,.12); border-color: rgba(45,212,191,.3); }
  .hbg span {
    display: block; width: 100%; height: 2px;
    background: var(--text); border-radius: 2px;
    transition: transform .28s ease, opacity .2s ease;
    transform-origin: center;
  }
  .hbg.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
  .hbg.open span:nth-child(2) { opacity: 0; transform: scaleX(0); }
  .hbg.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }
  
  /*  FOOTER  */
  .footer {
    border-top: 1px solid var(--stroke);
    padding: 20px 0; text-align: center;
    color: var(--muted); font-size: 13px;
    background: rgba(11,15,26,.7);
  }
  
  /* 
     LAYOUT
   */
  .page           { padding: 36px 0 80px; }
  .grid-container { overflow-x: hidden; }
  .kicker {
    letter-spacing: .18em; text-transform: uppercase;
    color: rgba(234,240,255,.5); font-size: 11px;
    margin: 0 0 5px; font-weight: 700;
  }
  .muted   { color: var(--muted); }
  .rule    { border: 0; border-top: 1px solid var(--stroke); margin: 44px 0; }
  .section { padding-top: 4px; }
  .crumb   { margin-bottom: 20px; font-size: 13px; }
  .btn-row {
    margin: 18px 0 14px;
    display: flex; flex-wrap: wrap; gap: 10px;
    align-items: center;
  }
  
  /* 
     BOX / CARD
   */
  .box {
    background: linear-gradient(160deg, rgba(255,255,255,.045), rgba(255,255,255,.018));
    border: 1px solid var(--stroke);
    border-radius: var(--radius);
    padding: 20px; box-shadow: var(--shadow);
  }
  .panel     { margin-bottom: 22px; }
  .box-title { margin: 0 0 12px; font-size: 16px; font-weight: 700; }
  
    /* Hero h1 — tight so "Building clean, modern" and "web experiences" sit close */
    h1 { line-height: 1.08; letter-spacing: -.4px; }
  
  /*  PROJECT PAGE RHYTHM — professor feedback 
     "6px more space above Key Features / Challenges.
      Bigger break, close close close, bigger break."
   */
  .section-heading {
    margin-top: 34px;
    margin-bottom: 14px;
    font-size: 20px;
    font-weight: 700;
  }
  .muted.small, p.muted.small { font-size: 14px; line-height: 1.65; }
  
  /*  ABOUT SECTION GRID 
     Row 1: bio box — full width (spans both columns)
     Row 2: My Interests + Education — side by side, equal
   */
  .about-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
  }
  .about-bio {
    grid-column: 1 / -1; /* full width — spans both columns */
  }
  /* on mobile: stack all three vertically */
  @media (max-width: 640px) {
    .about-grid { grid-template-columns: 1fr; }
    .about-bio  { grid-column: 1; }
  }
  
  code.snippet {
    background: rgba(255,255,255,.08);
    padding: 2px 7px; border-radius: 5px;
    font-size: 13px;
    font-family: 'Courier New', monospace;
  }
  
  /* 
     BUTTONS  — fully responsive, never overflow
   */
  .button {
    display: inline-block;
    border-radius: 14px !important;
    font-weight: 800 !important;
    font-size: 15px !important;
    letter-spacing: .2px !important;
    padding: 12px 22px !important;
    text-align: center !important;
    text-decoration: none !important;
    white-space: nowrap;
    max-width: 100%;
    transition: filter .15s, transform .15s, box-shadow .15s !important;
    cursor: pointer;
  }
  .button.primary {
    background: linear-gradient(135deg, var(--accent), rgba(45,212,191,.75)) !important;
    color: #071016 !important; border: none !important;
  }
  .button.primary:hover {
    filter: brightness(1.07) !important;
    transform: translateY(-1px) !important;
    box-shadow: 0 8px 22px rgba(45,212,191,.28) !important;
  }
  .button.hollow {
    background: transparent !important;
    border: 1px solid rgba(255,255,255,.25) !important;
    color: var(--text) !important;
  }
  .button.hollow:hover {
    border-color: rgba(45,212,191,.55) !important;
    color: var(--accent) !important;
  }
  /* Live demo button */
  .live-demo {
    background: rgba(255,255,255,.06) !important;
    border: 1px solid rgba(255,255,255,.14) !important;
    color: var(--text) !important;
    font-weight: 700 !important;
    border-radius: 12px !important;
    transition: all .22s !important;
    white-space: nowrap;
  }
  .live-demo:hover {
    background: var(--accent) !important;
    border-color: var(--accent) !important;
    color: #071016 !important;
    transform: translateY(-2px) !important;
    box-shadow: 0 8px 22px rgba(45,212,191,.28) !important;
  }
  
  /* 
     HERO SKILL GRID
   */
  .hero-visual {
    display: grid !important;
    grid-template-columns: repeat(3, 1fr) !important;
    gap: 10px !important;
    padding: 8px 0 !important;
    width: 100% !important;
  }
  .skill-card {
    background: linear-gradient(145deg, rgba(255,255,255,.06), rgba(255,255,255,.02));
    border: 1px solid rgba(255,255,255,.10);
    border-radius: 14px;
    padding: 18px 10px 14px !important;
    display: flex !important;
    flex-direction: column !important;
    align-items: center !important;
    justify-content: center !important;
    gap: 9px !important;
    min-height: 90px !important;
    cursor: default;
    transition: transform .22s, border-color .22s, box-shadow .22s, background .22s;
    animation: sc-fadein .5s both;
  }
  .skill-card:nth-child(1) { animation-delay: .05s }
  .skill-card:nth-child(2) { animation-delay: .10s }
  .skill-card:nth-child(3) { animation-delay: .15s }
  .skill-card:nth-child(4) { animation-delay: .20s }
  .skill-card:nth-child(5) { animation-delay: .25s }
  .skill-card:nth-child(6) { animation-delay: .30s }
  .skill-card:nth-child(7) { animation-delay: .35s }
  .skill-card:nth-child(8) { animation-delay: .40s }
  .skill-card:nth-child(9) { animation-delay: .45s }
  @keyframes sc-fadein {
    from { opacity: 0; transform: translateY(12px); }
    to   { opacity: 1; transform: translateY(0); }
  }
  .skill-card:hover {
    transform: translateY(-5px) scale(1.04);
    border-color: rgba(45,212,191,.45);
    box-shadow: 0 16px 38px rgba(0,0,0,.4), 0 0 0 1px rgba(45,212,191,.18);
    background: linear-gradient(145deg, rgba(45,212,191,.09), rgba(99,102,241,.06));
  }
  .skill-card i {
    font-size: 32px !important; line-height: 1 !important; display: block !important;
  }
  .skill-card span {
    font-size: 10px !important; font-weight: 700 !important;
    color: var(--muted) !important; letter-spacing: .06em !important;
    text-transform: uppercase !important; text-align: center !important;
    display: block !important; line-height: 1.2 !important;
  }
  
  /* 
     PROJECT CARDS
   */
  .project-card {
    display: block;
    background: linear-gradient(160deg, rgba(255,255,255,.045), rgba(255,255,255,.018));
    border: 1px solid var(--stroke);
    border-radius: var(--radius); overflow: hidden;
    text-decoration: none; margin-bottom: 18px;
    transition: transform .18s, border-color .18s, box-shadow .18s;
  }
  .project-card:hover {
    transform: translateY(-5px);
    border-color: rgba(45,212,191,.4);
    box-shadow: 0 22px 55px rgba(0,0,0,.45);
  }
  .thumb {
    position: relative; height: 170px; overflow: hidden;
    border-radius: 12px 12px 0 0;
    background: linear-gradient(135deg, #0f172a, #1a2540);
    display: flex; align-items: center; justify-content: center;
  }
  .thumb img { width: 100%; height: 100%; object-fit: cover; display: block; }
  .wf-rect.thumb {
    color: rgba(170,182,214,.25); font-size: 10px;
    font-weight: 700; letter-spacing: .12em; text-transform: uppercase;
  }
  .pc-body    { padding: 15px 16px 17px; }
  .pc-body h3 { margin: 0 0 5px; font-size: 16px; font-weight: 700; line-height: 1.3; }
  .pc-body p  { margin: 0; font-size: 13px; line-height: 1.4; }
  
  /* 
     PROJECT PAGE PREVIEW
   */
  .preview {
    width: 100%; height: 220px; overflow: hidden;
    border-radius: 12px; border: 1px solid var(--stroke);
    background:
      radial-gradient(500px 220px at 10% 0%,  rgba(45,212,191,.15), transparent 60%),
      radial-gradient(520px 220px at 90% 10%, rgba(99,102,241,.13), transparent 60%),
      rgba(255,255,255,.02);
    display: flex; align-items: center; justify-content: center;
  }
  .preview img { width: 100%; height: 100%; object-fit: cover; display: block; }
  
  /* 
     TAGS
   */
  .tag-row { display: flex; gap: 8px; flex-wrap: wrap; margin: 14px 0; }
  .tag {
    padding: 5px 12px; border-radius: 999px;
    font-weight: 800; font-size: 11px; letter-spacing: .03em;
    border: 1px solid rgba(255,255,255,.12);
    background: rgba(255,255,255,.06); color: var(--text);
  }
  .t1 { border-color: rgba(254,206,73,.35);  background: rgba(254,206,73,.09);  color: #fece49; }
  .t2 { border-color: rgba(34,197,94,.35);   background: rgba(34,197,94,.09);   color: #4ade80; }
  .t3 { border-color: rgba(96,165,250,.35);  background: rgba(96,165,250,.09);  color: #93c5fd; }
  .t4 { border-color: rgba(167,139,250,.35); background: rgba(167,139,250,.09); color: #c4b5fd; }
  
  /* 
     CONTACT FORM
   */
  .contact-outer {
    display: flex; gap: 28px;
    align-items: flex-start; flex-wrap: wrap; margin-top: 8px;
  }
  .cinfo-col { flex: 0 0 250px; display: flex; flex-direction: column; gap: 14px; }
  .cinfo-card {
    display: flex; align-items: flex-start; gap: 14px;
    background: linear-gradient(135deg, rgba(45,212,191,.07), rgba(99,102,241,.05));
    border: 1px solid rgba(45,212,191,.2);
    border-radius: 14px; padding: 16px;
  }
  .cinfo-icon  { font-size: 20px; line-height: 1; margin-top: 2px; flex-shrink: 0; }
  .cinfo-label { margin: 0 0 3px; font-size: 11px; letter-spacing: .1em; text-transform: uppercase; color: var(--muted); font-weight: 700; }
  .cinfo-val   { font-size: 13px; color: var(--accent); font-weight: 600; text-decoration: none; word-break: break-all; display: block; }
  .cinfo-val:hover { color: var(--text); }
  .cavail-badge {
    display: flex; align-items: center; gap: 10px;
    font-size: 13px; color: var(--muted); font-weight: 600;
    padding: 12px 16px;
    background: rgba(45,212,191,.06);
    border: 1px solid rgba(45,212,191,.18); border-radius: 999px;
  }
  .cavail-dot {
    width: 9px; height: 9px; border-radius: 50%;
    background: #22c55e; flex-shrink: 0;
    box-shadow: 0 0 8px rgba(34,197,94,.6);
    animation: cavail-pulse 2s infinite;
  }
  @keyframes cavail-pulse {
    0%,100% { box-shadow: 0 0 6px  rgba(34,197,94,.5); }
    50%     { box-shadow: 0 0 14px rgba(34,197,94,.9); }
  }
  .cform-col  { flex: 1; min-width: 280px; }
  .cform-card {
    background: linear-gradient(160deg, rgba(255,255,255,.05), rgba(255,255,255,.02));
    border: 1px solid rgba(255,255,255,.11);
    border-radius: 16px; padding: 28px;
    box-shadow: var(--shadow);
  }
  .cform-row2 { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
  .cff { margin-bottom: 14px; }
  .cfl {
    display: block; color: var(--text); font-size: 11px;
    font-weight: 700; letter-spacing: .08em;
    text-transform: uppercase; margin-bottom: 7px;
  }
  [type='text'].cfi,
  [type='email'].cfi,
  [type='tel'].cfi,
  textarea.cft {
    display: block !important; width: 100% !important;
    background-color: #0a1020 !important; color: var(--text) !important;
    border: 1px solid rgba(255,255,255,.15) !important;
    border-radius: 12px !important; padding: 13px 14px !important;
    font-size: 14px !important; font-family: inherit !important;
    box-shadow: none !important; outline: none !important;
    height: auto !important; margin: 0 !important;
    -webkit-appearance: none; appearance: none;
    transition: border-color .18s, box-shadow .18s;
  }
  [type='text'].cfi::placeholder,
  [type='email'].cfi::placeholder,
  textarea.cft::placeholder { color: rgba(170,182,214,.35) !important; }
  [type='text'].cfi:focus,
  [type='email'].cfi:focus,
  [type='tel'].cfi:focus,
  textarea.cft:focus {
    background-color: #0a1020 !important; color: var(--text) !important;
    border-color: var(--accent) !important;
    box-shadow: 0 0 0 3px rgba(45,212,191,.18) !important;
    outline: none !important;
  }
  textarea.cft { min-height: 140px; resize: vertical; }
  .cform-actions { display: flex; justify-content: flex-end; margin-top: 8px; }
  .csend-btn {
    background: linear-gradient(135deg, var(--accent), rgba(45,212,191,.75));
    color: #071016; border: none; border-radius: 14px;
    padding: 14px 32px; font-size: 15px; font-weight: 800;
    cursor: pointer; letter-spacing: .02em; width: 100%;
    transition: filter .15s, transform .15s, box-shadow .15s;
    box-shadow: 0 6px 22px rgba(45,212,191,.25);
  }
  .csend-btn:hover  { filter: brightness(1.08); transform: translateY(-2px); box-shadow: 0 10px 30px rgba(45,212,191,.38); }
  .csend-btn:active { transform: translateY(0); filter: brightness(.97); }
  
  
  /* 
     TABLET  ≤ 900px  — buttons stop overflowing
   */
  @media (max-width: 900px) {
    .btn-row { gap: 8px; }
    .button  { font-size: 14px !important; padding: 11px 18px !important; }
  }
  
  
  /* 
     MOBILE  ≤ 768px
   */
  @media (max-width: 768px) {
  
    /*  Hamburger on, nav collapses  */
    .hbg { display: flex !important; }
    .sitenav {
      position: absolute !important;
      top: 100% !important;
      left: 0 !important; right: 0 !important;
      flex-direction: column !important;
      align-items: stretch !important;
      gap: 0 !important;
      background: rgba(8,12,24,.98) !important;
      border-top: 1px solid rgba(45,212,191,.15) !important;
      border-bottom: 1px solid rgba(45,212,191,.15) !important;
      padding: 0 !important;
      max-height: 0 !important;
      overflow: hidden !important;
      transition: max-height .35s cubic-bezier(.4,0,.2,1) !important;
      z-index: 499 !important;
    }
    .sitenav.open  { max-height: 300px !important; }
    .snav-link {
      display: block !important;
      padding: 16px 20px !important;
      font-size: 17px !important; font-weight: 700 !important;
      color: var(--text) !important;
      border-bottom: 1px solid rgba(255,255,255,.06) !important;
      text-decoration: none !important;
      transition: background .15s, color .15s !important;
    }
    .snav-link:hover { background: rgba(45,212,191,.08) !important; color: var(--accent) !important; }
  
    /*  Layout  */
    .page { padding: 22px 0 60px; }
    .grid-container { padding-left: 16px !important; padding-right: 16px !important; }
    .rule { margin: 28px 0; }
  
    /*  Typography  */
    h1 { font-size: 26px !important; line-height: 1.15 !important; }
    h2 { font-size: 20px !important; line-height: 1.2 !important; }
    h3 { font-size: 15px !important; }
    p  { font-size: 15px !important; }
    .section-heading { font-size: 18px !important; margin-top: 26px !important; }
  
    /*  Hero  */
    .hero-visual { display: none !important; }
  
    /*  Boxes  */
    .box { padding: 14px; }
    .box-title { font-size: 14px !important; }
  
    /*  BUTTONS — full width on mobile  */
    .button {
      display: block !important;
      width: 100% !important;
      text-align: center !important;
      font-size: 15px !important;
      padding: 14px 16px !important;
      border-radius: 14px !important;
      margin: 0 !important;
      box-sizing: border-box !important;
      white-space: normal !important;
    }
    .btn-row {
      flex-direction: column !important;
      gap: 10px !important;
      width: 100% !important;
    }
    /* Live demo button also full width */
    .live-demo {
      display: block !important;
      width: 100% !important;
      text-align: center !important;
      padding: 14px 16px !important;
      box-sizing: border-box !important;
    }
    /* Sidebar live button */
    a.button[style*="display:block"] {
      width: 100% !important;
      box-sizing: border-box !important;
    }
  
    /*  Project cards — professor: higher contrast on mobile, show border always  */
    .project-card {
      border-color: rgba(255,255,255,.18) !important;
      box-shadow: 0 4px 16px rgba(0,0,0,.3) !important;
    }
    .thumb      { height: 130px; }
    .pc-body    { padding: 12px 13px; }
    .pc-body h3 { font-size: 15px !important; }
    .pc-body p  { font-size: 12px !important; }
  
    /*  Project page  */
    .preview    { height: 175px !important; }
    .crumb      { font-size: 12px; }
  
    /*  Tags  */
    .tag { font-size: 10px; padding: 5px 9px; }
    .tag-row { gap: 6px; }
  
    /*  Contact  */
    .contact-outer { flex-direction: column; }
    .cinfo-col     { flex: unset; width: 100%; }
    .cform-row2    { grid-template-columns: 1fr; }
    .cform-card    { padding: 18px; }
    .cform-actions { justify-content: flex-end; }
    .csend-btn     { width: auto !important; min-width: 160px; max-width: 260px; text-align: center; padding: 13px 24px; }
  
    /*  Aside  */
    aside.cell       { margin-top: 6px; }
    aside .box.panel { margin-top: 12px; }
  }
  
  
  /* 
     SMALL PHONE  ≤ 420px
   */
  @media (max-width: 420px) {
    .brand  { font-size: 15px; }
    h1      { font-size: 22px !important; }
    h2      { font-size: 18px !important; }
    .button { font-size: 14px !important; padding: 13px 14px !important; }
    .hero-visual { display: none !important; }
    .pc-body h3  { font-size: 14px !important; }
  }