/* ==========================================================================
   PORTFOLIO — DESIGN TOKENS
   Theme concept: "sky" ties to Cloud/AI infra work.
   Night = deep indigo sky + stars.  Morning = pale dawn sky + drifting clouds.
   ========================================================================== */

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

:root{
  /* type */
  --font-display: 'Space Grotesk', sans-serif;
  --font-body: 'Inter', sans-serif;
  --font-mono: 'JetBrains Mono', monospace;

  /* layout */
  --maxw: 1120px;
  --radius: 14px;
  --radius-sm: 8px;
  --ease: cubic-bezier(.22,.68,0,1);

  /* night palette (default) */
  --sky-top: #05081c;
  --sky-mid: #0d1330;
  --sky-bottom: #1a2444;
  --ink: #eef1fb;
  --ink-dim: #aab3d6;
  --ink-faint: #6f7aa3;
  --panel: rgba(255,255,255,0.045);
  --panel-border: rgba(255,255,255,0.09);
  --accent: #ffd27a;      /* starlight gold */
  --accent-2: #6ee7d8;    /* aurora teal */
  --accent-ink: #060a17;
  --star-color: 255,255,255;
  --shadow: 0 20px 60px -20px rgba(0,0,0,0.6);
}

html[data-theme="day"]{
  --sky-top: #79b8f2;
  --sky-mid: #bfe0fb;
  --sky-bottom: #fff1e0;
  --ink: #1c2333;
  --ink-dim: #4c5470;
  --ink-faint: #7c86a8;
  --panel: rgba(255,255,255,0.6);
  --panel-border: rgba(28,35,51,0.09);
  --accent: #ff7d47;      /* sunrise orange */
  --accent-2: #2f7fe0;    /* sky blue */
  --accent-ink: #fff8f0;
  --shadow: 0 20px 50px -24px rgba(30,50,90,0.28);
}

*{ box-sizing:border-box; margin:0; padding:0; }
html{ scroll-behavior:smooth; }
body{
  font-family: var(--font-body);
  color: var(--ink);
  background: var(--sky-bottom);
  overflow-x:hidden;
  line-height:1.6;
  transition: background .6s var(--ease), color .6s var(--ease);
}
a{ color:inherit; text-decoration:none; }
ul{ list-style:none; }
img{ max-width:100%; display:block; }
button{ font-family:inherit; cursor:pointer; border:none; background:none; color:inherit; }
::selection{ background: var(--accent); color: var(--accent-ink); }

.wrap{ max-width: var(--maxw); margin:0 auto; padding:0 24px; }

/* ---------- SKY BACKGROUND (signature element) ---------- */
#sky{
  position:fixed; inset:0; z-index:-2;
  background: linear-gradient(180deg, var(--sky-top) 0%, var(--sky-mid) 45%, var(--sky-bottom) 100%);
  transition: background 1s var(--ease);
}
#sky::after{
  content:"";
  position:absolute; inset:0;
  background: radial-gradient(60% 45% at 50% 100%, rgba(255,196,120,0.55) 0%, rgba(255,196,120,0) 70%);
  opacity:0;
  transition: opacity 1s var(--ease);
}
html[data-theme="day"] #sky::after{ opacity:1; }
html:not([data-theme="day"]) #sky::before{
  content:"";
  position:absolute; inset:0;
  background: radial-gradient(40% 30% at 78% 12%, rgba(255,255,255,0.06) 0%, rgba(255,255,255,0) 70%);
}
#sky-canvas{ position:fixed; inset:0; z-index:-1; width:100%; height:100%; pointer-events:none; }

/* ---------- terminal-style eyebrow labels ---------- */
.cmd{
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing:.02em;
  color: var(--accent-2);
  display:inline-flex; align-items:center; gap:8px;
  margin-bottom:14px;
  opacity:.9;
}
.cmd::before{ content:"$"; color: var(--accent); font-weight:600; }
.cmd .cursor{
  width:7px; height:14px; background:var(--accent-2); display:inline-block;
  animation: blink 1.1s steps(1) infinite;
}
@keyframes blink{ 50%{ opacity:0; } }

section{ padding: 84px 0; position:relative; }
.section-head{ max-width:640px; margin-bottom:36px; }
.section-head h2{
  font-family: var(--font-display);
  font-size: clamp(28px, 4vw, 40px);
  font-weight:600;
  letter-spacing:-.01em;
}
.section-head p{ color: var(--ink-dim); margin-top:10px; font-size:15.5px; }

@media (max-width: 768px){
  section{ padding: 64px 0; }
  .section-head{ margin-bottom:28px; }
}

/* ---------- NAV ---------- */
header{
  position:fixed; top:0; left:0; right:0; z-index:100;
  backdrop-filter: blur(14px);
  background: color-mix(in srgb, var(--sky-bottom) 55%, transparent);
  border-bottom:1px solid var(--panel-border);
  transition: background .6s var(--ease), border-color .6s var(--ease);
}
nav{ display:flex; align-items:center; justify-content:space-between; height:72px; }
.brand{ font-family:var(--font-mono); font-weight:500; font-size:15px; display:flex; align-items:center; gap:10px; }
.brand-dot{ width:9px; height:9px; border-radius:50%; background:var(--accent); box-shadow:0 0 10px var(--accent); }
.nav-links{ display:flex; gap:32px; }
.nav-links a{ font-size:14px; color:var(--ink-dim); transition:color .25s; position:relative; }
.nav-links a:hover{ color:var(--ink); }
.nav-actions{ display:flex; align-items:center; gap:14px; }
.theme-toggle{
  width:52px; height:28px; border-radius:20px; background:var(--panel); border:1px solid var(--panel-border);
  position:relative; padding:3px; transition:.3s;
}
.theme-toggle .knob{
  width:20px; height:20px; border-radius:50%; background:var(--accent);
  display:flex; align-items:center; justify-content:center; font-size:11px;
  transition: transform .35s var(--ease);
  transform: translateX(0);
}
html[data-theme="day"] .theme-toggle .knob{ transform: translateX(24px); }
.btn{
  font-family:var(--font-mono); font-size:13px; padding:10px 18px; border-radius:999px;
  border:1px solid var(--panel-border); transition:.25s var(--ease);
}
.btn-primary{ background:var(--accent); color:var(--accent-ink); border-color:transparent; font-weight:600; }
.btn-primary:hover{ transform:translateY(-2px); box-shadow:0 10px 24px -8px var(--accent); }
.btn-ghost:hover{ background:var(--panel); border-color:var(--accent-2); }
.menu-btn{ display:none; font-size:22px; }

/* ---------- HERO ---------- */
.hero{ min-height:100vh; display:flex; align-items:center; padding-top:120px; }
.hero-grid{ display:grid; grid-template-columns: 1.15fr .85fr; gap:56px; align-items:center; }
.hero h1{
  font-family:var(--font-display); font-weight:700; letter-spacing:-.02em;
  font-size:clamp(36px,5.4vw,60px); line-height:1.05; margin:6px 0 20px;
}
.hero .roles{ font-family:var(--font-mono); color:var(--accent-2); font-size:16px; min-height:24px; margin-bottom:20px; }
.hero .roles .type-caret{ border-right:2px solid var(--accent); }
.hero p.summary{ color:var(--ink-dim); font-size:16px; max-width:520px; margin-bottom:32px; }
.hero-actions{ display:flex; gap:14px; flex-wrap:wrap; margin-bottom:36px;}
.hero-links{ display:flex; gap:10px; flex-wrap:wrap; }
.hero-links .icon-link{
  display:inline-flex; align-items:center; gap:7px; font-family:var(--font-mono); font-size:12.5px;
  color:var(--ink-dim); border:1px solid var(--panel-border); background:var(--panel);
  padding:8px 13px; border-radius:999px; transition:.25s var(--ease);
}
.hero-links .icon-link:hover{ color:var(--accent-2); border-color:var(--accent-2); transform:translateY(-2px); }

.hero-card{
  background:var(--panel); border:1px solid var(--panel-border); border-radius:var(--radius);
  padding:28px; backdrop-filter:blur(10px); box-shadow:var(--shadow);
}
.hero-photo{
  width:100%; aspect-ratio:1; border-radius:var(--radius-sm); overflow:hidden; margin-bottom:20px;
  border:1px solid var(--panel-border); background:var(--panel);
}
.hero-photo img{ width:100%; height:100%; object-fit:cover; }
.stat-grid{ display:grid; grid-template-columns:1fr 1fr; gap:16px; }
.stat-grid .stat b{ font-family:var(--font-display); font-size:26px; color:var(--accent); display:block; }
.stat-grid .stat span{ font-size:12px; color:var(--ink-faint); font-family:var(--font-mono); }

/* ---------- ABOUT ---------- */
.about-grid{ display:grid; grid-template-columns: .9fr 1.1fr; gap:56px; }
.about-badges{ display:flex; flex-wrap:wrap; gap:10px; margin-top:22px; }
.badge{
  font-family:var(--font-mono); font-size:12px; padding:7px 12px; border-radius:999px;
  border:1px solid var(--panel-border); background:var(--panel); color:var(--ink-dim);
}
.about-copy p{ color:var(--ink-dim); margin-bottom:16px; font-size:15.5px; }
.about-copy strong{ color:var(--ink); font-weight:600; }

/* ---------- SKILLS ---------- */
.skill-groups{ display:grid; grid-template-columns:repeat(3,1fr); gap:20px; }
.skill-card{
  background:var(--panel); border:1px solid var(--panel-border); border-radius:var(--radius);
  padding:22px; transition:.3s var(--ease);
}
.skill-card:hover{ transform:translateY(-4px); border-color:var(--accent-2); }
.skill-card h3{ font-family:var(--font-mono); font-size:13px; color:var(--accent-2); margin-bottom:14px; }
.skill-card .tags{ display:flex; flex-wrap:wrap; gap:8px; }
.skill-card .tags span{ font-size:12.5px; color:var(--ink-dim); background:rgba(255,255,255,0.04); padding:5px 10px; border-radius:6px; }

/* ---------- TIMELINE (education + experience) ---------- */
.timeline{ position:relative; padding-left:28px; }
.timeline::before{ content:""; position:absolute; left:6px; top:6px; bottom:6px; width:1px; background:var(--panel-border); }
.tl-item{ position:relative; padding-bottom:36px; }
.tl-item:last-child{ padding-bottom:0; }
.tl-item::before{
  content:""; position:absolute; left:-28px; top:4px; width:11px; height:11px; border-radius:50%;
  background:var(--sky-bottom); border:2px solid var(--accent);
}
.tl-item .period{ font-family:var(--font-mono); font-size:12px; color:var(--accent-2); }
.tl-item h3{ font-family:var(--font-display); font-size:19px; margin:6px 0 4px; }
.tl-item .org{ color:var(--ink-dim); font-size:14px; margin-bottom:8px; }
.tl-item ul{ margin-top:8px; }
.tl-item li{ color:var(--ink-dim); font-size:14.5px; padding-left:16px; position:relative; margin-bottom:6px; }
.tl-item li::before{ content:"›"; position:absolute; left:0; color:var(--accent); }

/* ---------- PROJECTS ---------- */
.project-grid{ display:grid; grid-template-columns:repeat(2,1fr); gap:24px; }
.project-card{
  background:var(--panel); border:1px solid var(--panel-border); border-radius:var(--radius);
  overflow:hidden; transition:.35s var(--ease); display:flex; flex-direction:column;
}
.project-card:hover{ transform:translateY(-5px); box-shadow:var(--shadow); border-color:var(--accent-2); }
.project-media{ aspect-ratio:16/9; background:rgba(255,255,255,0.04); overflow:hidden; position:relative; }
.project-media img{ width:100%; height:100%; object-fit:cover; }
.project-status{
  position:absolute; top:12px; right:12px; font-family:var(--font-mono); font-size:10.5px;
  background:rgba(0,0,0,0.55); color:var(--accent-2); padding:4px 9px; border-radius:999px; letter-spacing:.05em;
}
.project-body{ padding:22px; display:flex; flex-direction:column; flex:1; }
.project-body h3{ font-family:var(--font-display); font-size:19px; margin-bottom:8px; }
.project-body p{ color:var(--ink-dim); font-size:14.5px; margin-bottom:14px; flex:1; }
.project-metrics{ display:flex; gap:10px; flex-wrap:wrap; margin-bottom:14px; }
.project-metrics span{ font-family:var(--font-mono); font-size:11.5px; color:var(--accent); border:1px solid var(--panel-border); padding:4px 9px; border-radius:6px; }
.project-tech{ display:flex; flex-wrap:wrap; gap:6px; margin-bottom:14px; }
.project-tech span{ font-size:11.5px; color:var(--ink-faint); }
.project-tech span:not(:last-child)::after{ content:"·"; margin-left:6px; }
.project-link{ font-family:var(--font-mono); font-size:13px; color:var(--accent-2); }

/* ---------- ACHIEVEMENTS ---------- */
.ach-grid{ display:grid; grid-template-columns:repeat(3,1fr); gap:18px; }
.ach-card{ background:var(--panel); border:1px solid var(--panel-border); border-radius:var(--radius); padding:20px; }
.ach-card h3{ font-family:var(--font-display); font-size:16px; margin-bottom:8px; }
.ach-card p{ color:var(--ink-dim); font-size:13.5px; }

/* ---------- CERTIFICATES (carousel) ---------- */
.cert-carousel{ position:relative; display:flex; align-items:center; gap:12px; }
.cert-track{
  display:flex; gap:18px; overflow-x:auto; scroll-behavior:smooth; scroll-snap-type:x mandatory;
  padding:6px 2px 14px; flex:1; scrollbar-width:none;
}
.cert-track::-webkit-scrollbar{ display:none; }
.cert-card{
  flex:0 0 calc(50% - 9px); min-width:0; scroll-snap-align:start;
  background:var(--panel); border:1px solid var(--panel-border); border-radius:var(--radius);
  overflow:hidden; cursor:pointer; transition:.3s var(--ease);
}
.cert-card:hover{ transform:translateY(-4px); border-color:var(--accent); }
.cert-thumb{ aspect-ratio:4/3; overflow:hidden; background:rgba(255,255,255,.04); }
.cert-thumb img{ width:100%; height:100%; object-fit:cover; }
.cert-info{ padding:14px; }
.cert-info h4{ font-size:13.5px; margin-bottom:3px; }
.cert-info span{ font-family:var(--font-mono); font-size:11px; color:var(--ink-faint); }

@media (max-width: 700px){
  .cert-card{ flex-basis:100%; }
}

.cert-arrow{
  flex:0 0 auto; width:44px; height:44px; border-radius:50%; display:flex; align-items:center; justify-content:center;
  background:var(--panel); border:1px solid var(--panel-border); color:var(--ink); transition:.25s var(--ease); z-index:2;
}
.cert-arrow:hover{ background:var(--accent); color:var(--accent-ink); border-color:transparent; transform:scale(1.06); }
.cert-arrow.disabled{ opacity:.3; pointer-events:none; }

/* lightbox */
#lightbox{
  position:fixed; inset:0; background:rgba(2,4,14,0.88); z-index:1000; display:none;
  align-items:center; justify-content:center; padding:40px; backdrop-filter:blur(6px);
}
#lightbox.open{ display:flex; }
#lightbox img{ max-height:86vh; border-radius:10px; box-shadow:0 30px 80px rgba(0,0,0,.5); }
#lightbox .close{ position:absolute; top:24px; right:32px; font-size:28px; color:#fff; }

/* ---------- CONTACT ---------- */
.contact-grid{ display:grid; grid-template-columns: .9fr 1.1fr; gap:56px; align-items: start; }
.contact-list{ display:flex; flex-direction:column; gap:16px; margin-top:22px; }
.contact-item{
  display:flex; align-items:center; justify-content:space-between; gap:12px;
  background:var(--panel); border:1px solid var(--panel-border); padding:14px 18px; border-radius:var(--radius-sm);
}
.contact-item .label{ font-family:var(--font-mono); font-size:11px; color:var(--ink-faint); display:block; }
.contact-item .value{ font-size:14.5px; }
.copy-btn{ font-family:var(--font-mono); font-size:11.5px; color:var(--accent-2); }
.social-row{ display:flex; gap:14px; margin-top:24px; }
.social-row a{
  width:40px; height:40px; border-radius:50%; border:1px solid var(--panel-border); background:var(--panel);
  display:flex; align-items:center; justify-content:center; font-size:15px; transition:.25s;
}
.social-row a:hover{ background:var(--accent); color:var(--accent-ink); transform:translateY(-3px); }

form.contact-form{ display:flex; flex-direction:column; gap:14px; }
.form-row{ display:grid; grid-template-columns:1fr 1fr; gap:14px; }
input, textarea{
  width:100%; background:var(--panel); border:1px solid var(--panel-border); border-radius:var(--radius-sm);
  padding:13px 15px; color:var(--ink); font-family:var(--font-body); font-size:14.5px; transition:.25s;
}
input:focus, textarea:focus{ outline:none; border-color:var(--accent-2); }
textarea{ min-height:130px; resize:vertical; }
.form-note{ font-family:var(--font-mono); font-size:12.5px; color:var(--accent-2); min-height:18px; }

footer{ padding:40px 0; border-top:1px solid var(--panel-border); text-align:center; }
footer p{ font-family:var(--font-mono); font-size:12.5px; color:var(--ink-faint); }
footer a{ color:var(--accent-2); }

/* ---------- scroll reveal ---------- */
.reveal{ opacity:0; transform:translateY(24px); transition:opacity .7s var(--ease), transform .7s var(--ease); }
.reveal.in{ opacity:1; transform:none; }

/* ---------- CHATBOT ---------- */
#chatbot-toggle{
  position:fixed; bottom:26px; right:26px; z-index:200; width:60px; height:60px; border-radius:50%;
  background: linear-gradient(145deg, var(--accent), var(--accent-2));
  color:var(--accent-ink); display:flex; align-items:center; justify-content:center;
  box-shadow:0 14px 34px -10px rgba(0,0,0,.5); transition:.3s var(--ease); position:fixed;
}
#chatbot-toggle:hover{ transform:scale(1.08) rotate(-4deg); }
#chatbot-toggle .pulse-ring{
  position:absolute; inset:-6px; border-radius:50%; border:2px solid var(--accent);
  animation: pulse-ring 2.4s ease-out infinite;
}
@keyframes pulse-ring{
  0%{ transform:scale(0.9); opacity:.7; }
  70%{ transform:scale(1.35); opacity:0; }
  100%{ opacity:0; }
}
#chatbot-toggle .chat-icon-close{ display:none; }
#chatbot-toggle.open .chat-icon-open{ display:none; }
#chatbot-toggle.open .chat-icon-close{ display:block; }
#chatbot-toggle.open .pulse-ring{ display:none; }
#chatbot-panel{
  position:fixed; bottom:96px; right:26px; z-index:200; width:340px; max-width:88vw; height:440px;
  background:var(--sky-mid); border:1px solid var(--panel-border); border-radius:16px; box-shadow:var(--shadow);
  display:none; flex-direction:column; overflow:hidden;
}
#chatbot-panel.open{ display:flex; }
.chat-head{ padding:16px 18px; border-bottom:1px solid var(--panel-border); display:flex; align-items:center; gap:10px; }
.chat-head .dot{ width:8px; height:8px; border-radius:50%; background:#5be36a; box-shadow:0 0 8px #5be36a; }
.chat-head b{ font-family:var(--font-mono); font-size:13.5px; }
.chat-head span{ font-size:11px; color:var(--ink-faint); display:block; }
.chat-body{ flex:1; overflow-y:auto; padding:16px; display:flex; flex-direction:column; gap:10px; }
.msg{ max-width:82%; padding:10px 13px; border-radius:12px; font-size:13.5px; line-height:1.5; }
.msg.bot{ background:var(--panel); border:1px solid var(--panel-border); align-self:flex-start; border-bottom-left-radius:3px; }
.msg.user{ background:var(--accent); color:var(--accent-ink); align-self:flex-end; border-bottom-right-radius:3px; }
.chat-suggest{ display:flex; flex-wrap:wrap; gap:6px; padding:0 16px 10px; }
.chat-suggest button{ font-size:11.5px; font-family:var(--font-mono); border:1px solid var(--panel-border); padding:5px 10px; border-radius:999px; color:var(--ink-dim); }
.chat-suggest button:hover{ border-color:var(--accent-2); color:var(--accent-2); }
.chat-input{ display:flex; border-top:1px solid var(--panel-border); }
.chat-input input{ border:none; border-radius:0; background:transparent; }
.chat-input button{ padding:0 18px; color:var(--accent-2); font-family:var(--font-mono); }

/* ---------- responsive ---------- */
@media (max-width: 900px){
  .hero-grid, .about-grid, .contact-grid{ grid-template-columns:1fr; }
  .skill-groups, .ach-grid{ grid-template-columns:repeat(2,1fr); }
  .project-grid{ grid-template-columns:1fr; }
  .cert-card{ width:190px; }
  .nav-links{
    display:none; position:absolute; top:72px; left:0; right:0; flex-direction:column; gap:0;
    background: var(--sky-bottom); border-bottom:1px solid var(--panel-border); padding:8px 24px 18px;
  }
  .nav-links.open{ display:flex; }
  .nav-links a{ padding:12px 0; border-bottom:1px solid var(--panel-border); }
  .menu-btn{ display:block; }
  .form-row{ grid-template-columns:1fr; }
  .skill-groups, .ach-grid{ grid-template-columns:1fr; }
}
@media (prefers-reduced-motion: reduce){
  *{ animation:none !important; transition:none !important; }
}