/* Global stylesheet for the portfolio */
:root {
  --bg: #0f172a;          /* slate-900 */
  --panel: #111827;       /* gray-900 */
  --text: #e5e7eb;        /* gray-200 */
  --muted: #94a3b8;       /* slate-400 */
  --brand: #60a5fa;       /* blue-400 */
  --brand-strong: #3b82f6;/* blue-500 */
  --accent: #22d3ee;      /* cyan-400 */
  --card: #0b1220;        /* dark panel */
  --border: #1f2937;      /* gray-800 */
  --focus: #f59e0b;       /* amber-500 for focus outline */
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: radial-gradient(1200px 700px at 10% 10%, #0b1220 0%, #0a0f1e 40%, var(--bg) 100%);
  color: var(--text);
  font: 16px/1.6 system-ui, -apple-system, Segoe UI, Roboto, Ubuntu, Cantarell, 'Helvetica Neue', Arial, 'Noto Sans', 'Apple Color Emoji', 'Segoe UI Emoji';
  min-height: 100%;
}

.container {
  /* Constrains content width and adds side padding for better readable measure */
  max-width: 1100px;
  margin: 0 auto;
  padding: 1.5rem;
}

/* Header & Navigation */
header.site-header {
  position: sticky;           /* keeps header visible while scrolling */
  top: 0;
  z-index: 10;
  background: rgba(11,18,32,0.8);
  backdrop-filter: blur(6px);
  border-bottom: 1px solid var(--border);
}

.brand {
  display: flex;
  align-items: center;
  gap: .6rem;
  font-weight: 700;
  letter-spacing: .2px;
}
.brand .dot { color: var(--accent); }

nav ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  gap: .8rem;
  flex-wrap: wrap;
}

nav a {
  display: inline-block;
  text-decoration: none;
  color: var(--text);
  padding: .6rem .9rem;
  border-radius: .6rem;
  border: 1px solid transparent;
}
nav a:hover,
nav a:focus {
  background: rgba(96,165,250,0.12);
  border-color: rgba(96,165,250,0.35);
  outline: none;
}
nav a[aria-current="page"] {
  background: rgba(59,130,246,0.18);
  border-color: rgba(59,130,246,0.65);
}

/* Common headings */
h1, h2, h3 { line-height: 1.25; margin: 0 0 .6rem; }
h1.title { font-size: clamp(1.6rem, 2.5vw + 1rem, 2.5rem); }
.subtitle { color: var(--muted); margin-bottom: 1.2rem; }

.hero {
  background: linear-gradient(180deg, rgba(34,211,238,.08), rgba(34,211,238,0) 60%);
  border: 1px solid var(--border);
  border-radius: 1rem;
  padding: 1.5rem;
  margin-top: 1rem;
}

/* Cards & Grids */
.grid { display: grid; gap: 1rem; }
.grid.cols-2 { grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); }
.grid.cols-3 { grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); }

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 1rem;
  padding: 1rem;
}

img.responsive { max-width: 100%; height: auto; border-radius: .75rem; border: 1px solid var(--border); }

figure { margin: 0; }

/* Projects page */
.project h3 { margin-top: .3rem; }
.project p { color: var(--muted); }

/* Contact form */
form.contact-form {
  display: grid;
  gap: 1rem;
  max-width: 680px;
}

label { font-weight: 600; }
input, textarea {
  width: 100%;
  background: #0e1527;
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: .6rem;
  padding: .8rem 1rem;
}
input:focus, textarea:focus {
  outline: 3px solid var(--focus);
  outline-offset: 2px;
}

.help { color: var(--muted); font-size: .9rem; }

button { 
  background: linear-gradient(180deg, var(--brand), var(--brand-strong)); 
  color: white; 
  border: 0; 
  padding: .8rem 1.1rem; 
  border-radius: .7rem; 
  cursor: pointer; 
  font-weight: 700;
}
button:hover { filter: brightness(1.05); }

/* Footer */
footer.site-footer {
  margin-top: 2rem;
  border-top: 1px solid var(--border);
  background: rgba(11,18,32,.65);
}
footer .inner {
  display: flex;
  flex-wrap: wrap;
  gap: .7rem 1.4rem;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 1.5rem;
}
footer a { color: var(--brand); }

/* Header layout */
header .container {
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: center;
  gap: 1rem;
}

/* Primary nav */
nav ul { display: block; }
nav ul li { display: inline-block; margin-right: .8rem; }
nav ul li:last-child { margin-right: 0; }

/* Footer with standard linear gradient */
footer.site-footer {
  background: linear-gradient(to right, rgba(59,130,246,0.15), rgba(34,211,238,0.10));
}

/* Hero with angled linear gradient */
.hero {
  background: linear-gradient(135deg, rgba(34,211,238,.10), rgba(34,211,238,0) 65%);
}

/* Fluid typography */
h1.title { font-size: clamp(1.6rem, 2.2vw + 1rem, 2.6rem); }