/* =========================================================
   Muhammad Rehan Khalid — portfolio
   Light + Dark themes (light default)
   ========================================================= */

/* ---- LIGHT THEME (default) ---- */
:root, [data-theme="light"]{
  --bg:        #ffffff;
  --bg-2:      #f7f9fc;
  --bg-3:      #eef2f7;
  --panel:     #ffffff;
  --line:      #e5e7eb;
  --line-2:    #d4d8df;
  --text:      #0b0f17;
  --text-2:    #475569;
  --text-3:    #6b7280;

  --accent:    #0f766e;          /* teal-700 — AA on white */
  --accent-2:  #4f46e5;          /* indigo-600 */
  --accent-3:  #db2777;          /* pink-600 */
  --good:      #16a34a;
  --warn:      #d97706;
  --danger:    #dc2626;

  /* Vivid stops for gradient fills (used as background, not text on white) */
  --grad:      linear-gradient(135deg, #14b8a6 0%, #6366f1 50%, #ec4899 100%);
  --grad-soft: linear-gradient(135deg, rgba(20,184,166,.08), rgba(99,102,241,.08));

  /* Hero radial backdrop (subtle on white) */
  --hero-r1:   rgba(20,184,166,.10);
  --hero-r2:   rgba(99,102,241,.12);
  --hero-r3:   rgba(236,72,153,.06);

  --shadow:    0 10px 30px rgba(15,23,42,.06);
  --shadow-lg: 0 20px 60px rgba(15,23,42,.10);

  /* Surfaces (cards, etc) */
  --surface:        #ffffff;
  --surface-grad:   linear-gradient(180deg, #ffffff, #fafbfd);
  --surface-hover:  rgba(20,184,166,.05);

  --chip-bg:        #f1f5f9;
  --chip-border:    #e5e7eb;
  --chip-text:      #475569;

  --nav-bg:         rgba(255,255,255,.78);
  --nav-border:     rgba(15,23,42,.06);

  --on-grad:        #ffffff;     /* readable text on the gradient (badge, btn-primary) */

  --r-sm: 8px; --r-md: 14px; --r-lg: 20px;

  color-scheme: light;
}

/* ---- DARK THEME ---- */
[data-theme="dark"]{
  --bg:        #0b0f17;
  --bg-2:      #0f1623;
  --bg-3:      #131c2c;
  --panel:     #131b2b;
  --line:      #1f2a40;
  --line-2:    #25324b;
  --text:      #e7ecf5;
  --text-2:    #aab3c5;
  --text-3:    #7c8699;

  --accent:    #5eead4;          /* teal-300 */
  --accent-2:  #818cf8;          /* indigo-400 */
  --accent-3:  #f472b6;          /* pink-400 */
  --good:      #34d399;
  --warn:      #fbbf24;
  --danger:    #f87171;

  --grad:      linear-gradient(135deg, #5eead4 0%, #818cf8 50%, #f472b6 100%);
  --grad-soft: linear-gradient(135deg, rgba(94,234,212,.12), rgba(129,140,248,.12));

  --hero-r1:   rgba(94,234,212,.15);
  --hero-r2:   rgba(129,140,248,.18);
  --hero-r3:   rgba(244,114,182,.10);

  --shadow:    0 10px 40px rgba(0,0,0,.35);
  --shadow-lg: 0 20px 60px rgba(0,0,0,.45);

  --surface:        #131b2b;
  --surface-grad:   linear-gradient(180deg, rgba(255,255,255,.03), rgba(255,255,255,.01));
  --surface-hover:  rgba(94,234,212,.05);

  --chip-bg:        rgba(255,255,255,.04);
  --chip-border:    var(--line);
  --chip-text:      var(--text-2);

  --nav-bg:         rgba(11,15,23,.72);
  --nav-border:     rgba(255,255,255,.06);

  --on-grad:        #0b0f17;

  color-scheme: dark;
}

*{box-sizing:border-box}
html{scroll-behavior:smooth}
html,body{margin:0;padding:0}
body{
  font-family:'Inter', system-ui, -apple-system, Segoe UI, Roboto, sans-serif;
  background:var(--bg);
  color:var(--text);
  line-height:1.6;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
  overflow-x:hidden;
  transition: background .25s ease, color .25s ease;
}
a{color:inherit;text-decoration:none}
img{max-width:100%;display:block}
ul{padding:0;margin:0;list-style:none}

.container{max-width:1180px;margin:0 auto;padding:0 28px}

/* =========================================================
   NAV
   ========================================================= */
.nav{
  position:sticky;top:0;z-index:50;
  backdrop-filter:saturate(140%) blur(12px);
  background:var(--nav-bg);
  border-bottom:1px solid var(--nav-border);
  transition:background .25s, border-color .25s;
}
.nav-inner{
  max-width:1180px;margin:0 auto;padding:14px 28px;
  display:flex;align-items:center;justify-content:space-between;gap:24px;
}
.nav-brand{display:flex;align-items:center;gap:12px;font-weight:700;letter-spacing:-.01em}
.brand-mark{
  width:32px;height:32px;border-radius:8px;
  background:var(--grad);
  display:grid;place-items:center;
  font-size:13px;color:var(--on-grad);font-weight:800;
  box-shadow:0 6px 20px color-mix(in srgb, var(--accent) 25%, transparent);
}
.brand-text{font-size:14.5px;color:var(--text-2)}
.nav-links{display:flex;gap:6px;align-items:center}
.nav-links a{
  font-size:14px;color:var(--text-2);
  padding:8px 12px;border-radius:8px;
  transition:color .2s, background .2s;
}
.nav-links a:hover{color:var(--text);background:color-mix(in srgb, var(--text) 6%, transparent)}
.nav-cta{
  background:var(--grad)!important;color:var(--on-grad)!important;
  font-weight:600;padding:8px 16px!important;border-radius:999px!important;
}
.nav-cta:hover{filter:brightness(1.08)}

.nav-toggle{display:none;background:none;border:0;cursor:pointer;padding:8px;color:var(--text)}
.nav-toggle span{display:block;width:22px;height:2px;background:currentColor;margin:4px 0;border-radius:2px;transition:.25s}

/* theme toggle button */
.theme-toggle{
  background:transparent;
  border:1px solid var(--line);
  width:38px;height:38px;border-radius:50%;
  display:inline-flex;align-items:center;justify-content:center;
  color:var(--text-2);cursor:pointer;
  transition:.2s;
  margin-left:4px;padding:0;
  flex-shrink:0;
}
.theme-toggle:hover{
  color:var(--text);
  border-color:var(--accent);
  background:color-mix(in srgb, var(--accent) 8%, transparent);
}
.theme-toggle .icon{
  width:18px;height:18px;
  display:block;
}
/* default-hide both, then show the right one per active theme */
.theme-toggle .icon-sun,
.theme-toggle .icon-moon{display:none}
[data-theme="light"] .theme-toggle .icon-moon{display:block}
[data-theme="dark"]  .theme-toggle .icon-sun{display:block}

/* =========================================================
   HERO
   ========================================================= */
.hero{position:relative;padding:80px 0 90px;overflow:hidden}
.hero-bg{
  position:absolute;inset:-1px 0 auto 0;height:120%;z-index:0;pointer-events:none;
  background:
    radial-gradient(900px 460px at 15% 10%, var(--hero-r1), transparent 60%),
    radial-gradient(800px 460px at 85% 5%,  var(--hero-r2), transparent 60%),
    radial-gradient(700px 380px at 50% 90%, var(--hero-r3), transparent 60%);
  filter:saturate(120%);
}
.hero-grid{
  position:relative;z-index:1;
  display:grid;grid-template-columns:1.35fr .9fr;gap:56px;align-items:center;
}
.eyebrow{
  display:inline-flex;align-items:center;gap:8px;
  font-size:13px;color:var(--text-2);
  background:color-mix(in srgb, var(--accent) 10%, transparent);
  border:1px solid color-mix(in srgb, var(--accent) 28%, transparent);
  padding:6px 12px;border-radius:999px;margin:0 0 18px;
}
.eyebrow .dot{
  width:8px;height:8px;border-radius:50%;background:var(--good);
  box-shadow:0 0 0 4px color-mix(in srgb, var(--good) 22%, transparent);
}
h1{
  font-size:clamp(34px, 4.6vw, 60px);
  line-height:1.05;letter-spacing:-.025em;font-weight:800;
  margin:0 0 14px;
}
.grad{
  background:var(--grad);
  -webkit-background-clip:text;background-clip:text;color:transparent;
}
.hero-sub{
  font-size:clamp(16px, 1.6vw, 20px);
  color:var(--text-2);font-weight:500;margin:0 0 22px;letter-spacing:.01em;
}
.hero-lead{
  font-size:16.5px;color:var(--text-2);
  max-width:62ch;margin:0 0 28px;
}
.hero-lead strong{color:var(--text)}

.hero-ctas{display:flex;gap:12px;flex-wrap:wrap;margin-bottom:34px}
.btn{
  display:inline-flex;align-items:center;gap:8px;
  padding:12px 20px;border-radius:999px;
  font-size:14.5px;font-weight:600;
  border:1px solid transparent;cursor:pointer;
  transition:transform .15s ease, background .2s, border-color .2s, color .2s, box-shadow .2s;
}
.btn:hover{transform:translateY(-1px)}
.btn-primary{
  background:var(--grad);color:var(--on-grad);
  box-shadow:0 8px 24px color-mix(in srgb, var(--accent) 25%, transparent);
}
.btn-primary:hover{filter:brightness(1.05)}
.btn-ghost{
  background:transparent;color:var(--text);
  border-color:var(--line-2);
}
.btn-ghost:hover{
  background:color-mix(in srgb, var(--accent) 6%, transparent);
  border-color:var(--accent);
}

.hero-stats{
  display:grid;grid-template-columns:repeat(4,1fr);gap:14px;
  margin-bottom:28px;
}
.hero-stats > div{
  background:var(--surface-grad);
  border:1px solid var(--line);
  border-radius:var(--r-md);
  padding:14px 16px;
  box-shadow:var(--shadow);
}
.hero-stats strong{display:block;font-size:22px;letter-spacing:-.02em}
.hero-stats span{display:block;color:var(--text-3);font-size:12.5px;margin-top:4px}

.hero-socials{display:flex;flex-wrap:wrap;gap:10px}
.hero-socials a{
  display:inline-flex;align-items:center;gap:8px;
  padding:8px 14px;border-radius:999px;
  background:var(--surface);
  border:1px solid var(--line);
  color:var(--text-2);font-size:13.5px;
  transition:.2s;
}
.hero-socials a:hover{
  color:var(--text);border-color:var(--accent);
  background:color-mix(in srgb, var(--accent) 8%, transparent);
}
.hero-socials svg{opacity:.85}

/* hero card */
.hero-card{
  position:relative;
  display:flex;flex-direction:column;align-items:center;gap:18px;
}
.profile-ring{
  position:relative;
  width:min(360px, 80%);aspect-ratio:1;border-radius:50%;
  padding:6px;
  background:var(--grad);
  box-shadow:
    0 30px 80px color-mix(in srgb, var(--accent) 20%, transparent),
    0 0 0 8px color-mix(in srgb, var(--accent) 6%, transparent);
  animation: float 6s ease-in-out infinite;
}
.profile-ring::after{
  content:"";position:absolute;inset:-26px;border-radius:50%;
  background:radial-gradient(closest-side, color-mix(in srgb, var(--accent) 20%, transparent), transparent 70%);
  z-index:-1;filter:blur(8px);
}
.profile-ring img{
  width:100%;height:100%;border-radius:50%;
  object-fit:cover;background:var(--bg-2);
}
@keyframes float{
  0%,100%{transform:translateY(0)}
  50%{transform:translateY(-8px)}
}
.badge-stack{display:flex;flex-wrap:wrap;gap:8px;justify-content:center}
.badge{
  display:inline-flex;align-items:center;gap:8px;
  font-size:12.5px;color:var(--on-grad);font-weight:600;
  background:var(--accent);padding:6px 12px;border-radius:999px;
}
.badge.subtle{
  background:var(--chip-bg);
  color:var(--text-2);border:1px solid var(--chip-border);
}
.badge-dot{width:8px;height:8px;background:var(--on-grad);border-radius:50%}

/* =========================================================
   SECTION
   ========================================================= */
.section{padding:90px 0;position:relative}
.section.alt{background:linear-gradient(180deg, var(--bg-2), var(--bg))}
.section-eyebrow{
  font-family:'JetBrains Mono', ui-monospace, monospace;
  color:var(--accent);font-size:13px;margin:0 0 10px;letter-spacing:.02em;
  font-weight:600;
}
.section-title{
  font-size:clamp(28px, 3.4vw, 44px);
  font-weight:800;letter-spacing:-.02em;margin:0 0 40px;line-height:1.1;
}

/* =========================================================
   ABOUT + TERMINAL
   ========================================================= */
.about-grid{display:grid;grid-template-columns:1fr 1fr;gap:48px;align-items:start}
.about-copy p{color:var(--text-2);font-size:16px;margin:0 0 16px}
.about-copy strong{color:var(--text)}
.about-tags{display:flex;flex-wrap:wrap;gap:8px;margin-top:18px}
.about-tags span{
  font-size:12.5px;color:var(--accent);
  background:color-mix(in srgb, var(--accent) 10%, transparent);
  border:1px solid color-mix(in srgb, var(--accent) 28%, transparent);
  padding:5px 12px;border-radius:999px;
  font-weight:500;
}

/* Terminal stays dark in both themes — looks like an embedded code editor */
.terminal{
  background:#0a0f1a;border:1px solid #1f2a40;
  border-radius:var(--r-md);overflow:hidden;
  box-shadow:var(--shadow-lg);
  position:sticky;top:90px;
}
.terminal-bar{
  display:flex;align-items:center;gap:8px;
  padding:12px 14px;
  background:linear-gradient(180deg,#13192a,#0d1322);
  border-bottom:1px solid #1f2a40;
}
.terminal-bar .dot{width:11px;height:11px;border-radius:50%}
.terminal-bar .dot.red{background:#ff5f56}
.terminal-bar .dot.yellow{background:#ffbd2e}
.terminal-bar .dot.green{background:#27c93f}
.terminal-title{
  margin-left:auto;font-family:'JetBrains Mono', monospace;
  color:#7c8699;font-size:12.5px;
}
.terminal-body{
  font-family:'JetBrains Mono', ui-monospace, monospace;
  font-size:13.5px;line-height:1.65;
  color:#cdd6f4;padding:18px 18px 22px;margin:0;
  white-space:pre;overflow-x:auto;
}
.tk-k{color:#7dd3fc}    /* keys: blue */
.tk-s{color:#a7f3d0}    /* strings: teal */
.tk-p{color:#94a3b8}    /* punctuation */
.tk-b{color:#fbbf24}    /* booleans / status */

/* =========================================================
   EXPERIENCE TIMELINE
   ========================================================= */
.timeline{position:relative;padding-left:0;display:flex;flex-direction:column;gap:32px}
.t-item{
  display:grid;grid-template-columns:200px 1fr;gap:28px;align-items:start;
  position:relative;padding-left:0;
}
.t-meta{padding-top:8px}
.t-period{
  display:block;font-family:'JetBrains Mono', monospace;
  font-size:13px;color:var(--accent);letter-spacing:.01em;
  font-weight:600;
}
.t-loc{display:block;color:var(--text-3);font-size:12.5px;margin-top:4px}

.t-card{
  position:relative;
  background:var(--surface-grad);
  border:1px solid var(--line);
  border-radius:var(--r-md);
  padding:22px 24px;
  box-shadow:var(--shadow);
  transition:transform .2s ease, border-color .2s, background .2s, box-shadow .2s;
}
.t-card:hover{
  transform:translateY(-3px);
  border-color:var(--accent);
  background:var(--surface-hover);
  box-shadow:var(--shadow-lg);
}
.t-card::before{
  content:"";position:absolute;left:-15px;top:26px;width:8px;height:8px;border-radius:50%;
  background:var(--accent);
  box-shadow:0 0 0 4px color-mix(in srgb, var(--accent) 22%, transparent);
}
.t-head{display:flex;flex-direction:column;gap:4px;margin-bottom:8px}
.t-head h3{margin:0;font-size:19px;letter-spacing:-.01em}
.t-org{font-size:14px;color:var(--accent);font-weight:600}
.t-org:hover{text-decoration:underline}
.t-project{color:var(--text-2);font-size:14.5px;margin:6px 0 12px}
.t-card ul{display:flex;flex-direction:column;gap:8px;margin:0 0 14px;padding-left:0}
.t-card li{
  position:relative;padding-left:18px;color:var(--text-2);font-size:14.5px;line-height:1.55;
}
.t-card li::before{
  content:"▸";position:absolute;left:0;top:0;color:var(--accent);font-size:12px;
}
.t-card strong{color:var(--text)}

.tags{display:flex;flex-wrap:wrap;gap:6px;margin-top:6px}
.tags span{
  font-size:11.5px;color:var(--chip-text);
  background:var(--chip-bg);border:1px solid var(--chip-border);
  padding:4px 10px;border-radius:999px;letter-spacing:.01em;
  font-family:'JetBrains Mono', monospace;
}

/* =========================================================
   PROJECTS
   ========================================================= */
.projects-grid{
  display:grid;gap:20px;
  grid-template-columns:repeat(auto-fit, minmax(320px, 1fr));
}
.project{
  position:relative;
  background:var(--surface-grad);
  border:1px solid var(--line);
  border-radius:var(--r-md);
  padding:22px 22px 20px;
  display:flex;flex-direction:column;gap:10px;
  box-shadow:var(--shadow);
  transition:transform .2s ease, border-color .2s, background .2s, box-shadow .2s;
  overflow:hidden;
}
.project::after{
  content:"";position:absolute;inset:auto -40% -60% auto;width:240px;height:240px;
  background:radial-gradient(closest-side, color-mix(in srgb, var(--accent) 12%, transparent), transparent 70%);
  pointer-events:none;
}
.project:hover{
  transform:translateY(-4px);
  border-color:var(--accent);
  background:var(--surface-hover);
  box-shadow:var(--shadow-lg);
}
.project-head{display:flex;justify-content:space-between;align-items:center;gap:10px;flex-wrap:wrap}
.project-tag{
  font-family:'JetBrains Mono', monospace;font-size:11.5px;
  color:var(--accent);letter-spacing:.02em;font-weight:600;
}
.project h3{margin:2px 0 4px;font-size:19px;letter-spacing:-.01em}
.project p{color:var(--text-2);font-size:14.5px;margin:0 0 6px}

/* =========================================================
   SKILLS
   ========================================================= */
.skills-grid{
  display:grid;gap:20px;
  grid-template-columns:repeat(auto-fit, minmax(280px, 1fr));
}
.skill-card{
  background:var(--surface-grad);
  border:1px solid var(--line);
  border-radius:var(--r-md);
  padding:22px;
  box-shadow:var(--shadow);
}
.skill-card h3{
  margin:0 0 14px;font-size:16px;letter-spacing:.01em;
  color:var(--text);position:relative;padding-bottom:10px;
}
.skill-card h3::after{
  content:"";position:absolute;left:0;bottom:0;
  width:36px;height:2px;border-radius:2px;background:var(--grad);
}
.chips{display:flex;flex-wrap:wrap;gap:6px}
.chips li{
  font-size:12.5px;color:var(--chip-text);
  background:var(--chip-bg);border:1px solid var(--chip-border);
  padding:5px 11px;border-radius:999px;
  transition:.2s;
}
.chips li:hover{
  color:var(--text);border-color:var(--accent);
  background:color-mix(in srgb, var(--accent) 10%, transparent);
}

/* =========================================================
   EDUCATION
   ========================================================= */
.edu-grid{display:grid;gap:20px;grid-template-columns:repeat(auto-fit, minmax(320px, 1fr))}
.edu-card{
  background:var(--surface-grad);
  border:1px solid var(--line);
  border-radius:var(--r-md);
  padding:22px;
  box-shadow:var(--shadow);
}
.edu-period{
  font-family:'JetBrains Mono', monospace;
  font-size:12.5px;color:var(--accent);margin-bottom:6px;font-weight:600;
}
.edu-card h3{margin:0 0 4px;font-size:18px}
.edu-org{color:var(--text);font-weight:500;margin:0 0 8px;font-size:14.5px}
.edu-card p{color:var(--text-2);font-size:14.5px;margin:6px 0 0}

/* =========================================================
   CONTACT
   ========================================================= */
.contact-wrap{text-align:center}
.contact-wrap .section-eyebrow,
.contact-wrap .section-title{text-align:center}
.contact-lead{
  color:var(--text-2);max-width:62ch;margin:-20px auto 30px;font-size:16px;
}
.contact-lead strong{color:var(--text)}
.contact-cards{
  display:grid;gap:14px;margin:0 auto 30px;max-width:900px;
  grid-template-columns:repeat(auto-fit, minmax(220px, 1fr));
}
.c-card{
  display:flex;flex-direction:column;gap:4px;
  padding:18px 20px;border-radius:var(--r-md);
  background:var(--surface-grad);
  border:1px solid var(--line);text-align:left;
  box-shadow:var(--shadow);
  transition:.2s;
}
.c-card:hover{
  transform:translateY(-3px);
  border-color:var(--accent);
  background:var(--surface-hover);
  box-shadow:var(--shadow-lg);
}
.c-card span{color:var(--text-3);font-size:12.5px;font-family:'JetBrains Mono', monospace}
.c-card strong{font-size:15px;color:var(--text);font-weight:500;letter-spacing:-.01em;word-break:break-word}
.cta-row{display:flex;gap:12px;justify-content:center;flex-wrap:wrap}

/* =========================================================
   FOOTER
   ========================================================= */
.footer{padding:30px 0;border-top:1px solid var(--line)}
.footer-inner{
  display:flex;align-items:center;justify-content:space-between;gap:14px;
  color:var(--text-3);font-size:13px;flex-wrap:wrap;
}
.muted{color:var(--text-3)}

/* =========================================================
   RESPONSIVE
   ========================================================= */
@media (max-width: 980px){
  .hero{padding:60px 0 70px}
  .hero-grid{grid-template-columns:1fr;gap:40px}
  .hero-card{order:-1}
  .profile-ring{width:min(280px, 70%)}
  .hero-stats{grid-template-columns:repeat(2,1fr)}
  .about-grid{grid-template-columns:1fr;gap:32px}
  .terminal{position:relative;top:0}
  .t-item{grid-template-columns:1fr;gap:10px}
  .t-card::before{display:none}
}
@media (max-width: 720px){
  .nav-toggle{display:block}
  .nav-links{
    position:absolute;top:100%;right:14px;left:14px;
    background:var(--surface);
    backdrop-filter:blur(10px);
    border:1px solid var(--line);border-radius:var(--r-md);
    box-shadow:var(--shadow-lg);
    flex-direction:column;align-items:stretch;
    padding:10px;gap:2px;
    transform:translateY(-8px);opacity:0;pointer-events:none;
    transition:.2s;
  }
  .nav-links.open{transform:translateY(0);opacity:1;pointer-events:auto}
  .nav-links a{padding:12px 14px}
  .theme-toggle{align-self:flex-end;margin:6px}
  .brand-text{display:none}
  .container{padding:0 18px}
  .section{padding:64px 0}
}

/* Reduce motion */
@media (prefers-reduced-motion: reduce){
  *{animation:none!important;transition:none!important}
  html{scroll-behavior:auto}
}