/* ============================================================
   MAIN.CSS
   CSS custom properties, reset, base layout, typography
   ============================================================ */

/* ── FONTS ──────────────────────────────────────────────────── */
/* Loaded via <link> in HTML: Syne, DM Sans, JetBrains Mono    */

/* ── DESIGN TOKENS ──────────────────────────────────────────── */
:root {
  /* Dark theme — deep navy-black */
  --bg:            #080c18;
  --bg-surface:    #0e1626;
  --bg-elevated:   #16213a;
  --bg-hover:      #1c2a45;

  --accent:        #5ef0b0;
  --accent-rgb:    94, 240, 176;
  --accent-dim:    rgba(94, 240, 176, 0.07);
  --accent-mid:    rgba(94, 240, 176, 0.13);
  --accent-border: rgba(94, 240, 176, 0.28);

  --secondary:     #9b8ff8;
  --secondary-rgb: 155, 143, 248;
  --secondary-dim: rgba(155, 143, 248, 0.07);
  --secondary-border: rgba(155, 143, 248, 0.25);

  --text-1:        #e8edf5;
  --text-2:        #7d8ea4;
  --text-3:        #3a4558;

  --dot-color:     rgba(255, 255, 255, 0.055);

  --border:        rgba(255, 255, 255, 0.055);
  --border-hover:  rgba(255, 255, 255, 0.11);

  --shadow-sm:     0 2px 8px  rgba(0, 0, 0, 0.35);
  --shadow-md:     0 8px 32px rgba(0, 0, 0, 0.45);
  --shadow-lg:     0 20px 60px rgba(0, 0, 0, 0.55);

  /* Layout */
  --sidebar-w:     262px;
  --content-pad:   clamp(28px, 4vw, 72px);
  --shell-max:     1280px;   /* full width for grids, tabs, cards */
  --measure:       62ch;     /* readable width for running prose */
  --section-gap:   120px;

  /* Typography */
  --font-display:  'Syne', sans-serif;
  --font-body:     'DM Sans', sans-serif;
  --font-mono:     'JetBrains Mono', monospace;

  /* Misc */
  --radius-xs:     4px;
  --radius-sm:     7px;
  --radius-md:     12px;
  --radius-lg:     18px;
  --ease:          cubic-bezier(0.4, 0, 0.2, 1);
  --transition:    all 0.2s var(--ease);
  --transition-md: all 0.35s var(--ease);
}

/* Light theme overrides */
[data-theme="light"] {
  --bg:            #f0f3fa;
  --bg-surface:    #ffffff;
  --bg-elevated:   #e7ecf6;
  --bg-hover:      #dce3f0;

  --accent:        #0b9e6e;
  --accent-rgb:    11, 158, 110;
  --accent-dim:    rgba(11, 158, 110, 0.07);
  --accent-mid:    rgba(11, 158, 110, 0.13);
  --accent-border: rgba(11, 158, 110, 0.28);

  --secondary:     #5646c8;
  --secondary-rgb: 86, 70, 200;
  --secondary-dim: rgba(86, 70, 200, 0.06);
  --secondary-border: rgba(86, 70, 200, 0.22);

  --text-1:        #0d1117;
  --text-2:        #4b5563;
  --text-3:        #9ca3af;

  --dot-color:     rgba(0, 0, 0, 0.045);

  --border:        rgba(0, 0, 0, 0.07);
  --border-hover:  rgba(0, 0, 0, 0.14);

  --shadow-sm:     0 2px 8px  rgba(0, 0, 0, 0.07);
  --shadow-md:     0 8px 32px rgba(0, 0, 0, 0.1);
  --shadow-lg:     0 20px 60px rgba(0, 0, 0, 0.14);
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-body);
  font-size: 1rem;
  font-weight: 400;
  line-height: 1.7;
  color: var(--text-1);
  background-color: var(--bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
  min-height: 100vh;
  transition: background-color 0.3s var(--ease), color 0.3s var(--ease);
}

/* Dot-grid background */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  background-image: radial-gradient(circle, var(--dot-color) 1px, transparent 0);
  background-size: 28px 28px;
  pointer-events: none;
  z-index: 0;
}

a {
  color: inherit;
  text-decoration: none;
}

ul, ol { list-style: none; }

img, svg { display: block; max-width: 100%; }

button {
  cursor: pointer;
  border: none;
  background: none;
  font: inherit;
  color: inherit;
  appearance: none;
}

strong { font-weight: 600; color: var(--text-1); }

/* ── TYPOGRAPHY DEFAULTS ─────────────────────────────────────── */
h1, h2, h3, h4, h5 {
  font-family: var(--font-display);
  line-height: 1.15;
  color: var(--text-1);
}

p { color: var(--text-2); }

code, kbd, samp, .mono {
  font-family: var(--font-mono);
  font-size: 0.85em;
}

/* ── LAYOUT ──────────────────────────────────────────────────── */
/* No z-index here: it would make .layout a stacking context and trap the
   sidebar (z 100) beneath the drawer backdrop (z 90) on mobile. */
.layout {
  position: relative;
  display: flex;
  min-height: 100vh;
}

/* SIDEBAR — fixed on desktop */
.sidebar {
  position: fixed;
  top: 0;
  left: 0;
  width: var(--sidebar-w);
  height: 100vh;
  z-index: 100;
  display: flex;
  flex-direction: column;
  border-right: 1px solid var(--border);
  /* Same dot-grid as body::before (which the opaque background would hide).
     Both are anchored at viewport x=0, so the 28px phase matches and the
     texture continues across the sidebar border without a tonal seam. */
  background-color: var(--bg);
  background-image: radial-gradient(circle, var(--dot-color) 1px, transparent 0);
  background-size: 28px 28px;
  overflow-y: auto;
  overflow-x: hidden;
  transition: transform 0.32s var(--ease),
              background-color 0.3s var(--ease),
              border-color 0.3s var(--ease);
}

/* Sidebar scrollbar (webkit) */
.sidebar::-webkit-scrollbar { width: 4px; }
.sidebar::-webkit-scrollbar-track { background: transparent; }
.sidebar::-webkit-scrollbar-thumb { background: var(--border); border-radius: 2px; }

.sidebar-inner {
  display: flex;
  flex-direction: column;
  padding: 44px 28px 32px;
  min-height: 100%;
  gap: 28px;
}

/* The spacer pushes social + theme to the bottom */
.sidebar-spacer { flex: 1; }

/* MAIN CONTENT */
.content {
  position: relative;
  z-index: 1;
  margin-left: var(--sidebar-w);
  flex: 1;
  min-width: 0;
  padding: 0 var(--content-pad);
}

/* ── OVERLAYS ────────────────────────────────────────────────── */
/* Grain texture */
.noise-overlay {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 2;
  opacity: 0.022;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='300' height='300'%3E%3Cfilter id='n' x='0' y='0'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.75' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='300' height='300' filter='url(%23n)' opacity='1'/%3E%3C/svg%3E");
  background-size: 300px 300px;
}

/* Cursor glow */
.cursor-glow {
  position: fixed;
  pointer-events: none;
  z-index: 3;
  width: 480px;
  height: 480px;
  border-radius: 50%;
  transform: translate(-50%, -50%);
  background: radial-gradient(circle at center,
    rgba(var(--accent-rgb), 0.065) 0%,
    rgba(var(--accent-rgb), 0.02)  40%,
    transparent 70%
  );
  transition: opacity 0.4s ease;
  opacity: 0;
  will-change: left, top;
}

/* Mobile sidebar backdrop */
.sidebar-backdrop {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.55);
  z-index: 90;
  opacity: 0;
  /* Invisible AND untouchable while closed; otherwise a transparent
     full-screen layer eats every tap on the page. */
  pointer-events: none;
  transition: opacity 0.3s ease;
}

.sidebar-backdrop.visible {
  opacity: 1;
  pointer-events: auto;
}

/* Mobile hamburger */
.hamburger {
  display: none;
  position: fixed;
  top: 18px;
  right: 18px;
  z-index: 200;
  width: 40px;
  height: 40px;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
  background: var(--bg-surface);
  border: 1px solid var(--border);
  color: var(--text-1);
  transition: var(--transition);
}

.hamburger:hover {
  border-color: var(--accent);
  color: var(--accent);
}

/* ── SECTION BASE ────────────────────────────────────────────── */
.section {
  padding: var(--section-gap) 0;
  border-bottom: 1px solid var(--border);
}

.section:last-of-type { border-bottom: none; }

/* The shell is wide; running prose gets its own narrower measure so
   line length stays readable (see .hero-bio, .exp-body, .contact-inner). */
.section-inner {
  width: 100%;
  max-width: var(--shell-max);
  margin-inline: auto;
}

.section-title {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-1);
  margin-bottom: 44px;
  display: flex;
  align-items: baseline;
  gap: 12px;
  letter-spacing: -0.01em;
}

.section-num {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  color: var(--accent);
  font-weight: 400;
}

/* ── RESPONSIVE ──────────────────────────────────────────────── */
@media (max-width: 920px) {
  .sidebar {
    transform: translateX(-100%);
    box-shadow: none;
  }

  .sidebar.open {
    transform: translateX(0);
    box-shadow: var(--shadow-lg);
  }

  .sidebar-backdrop {
    display: block;
  }

  .content {
    margin-left: 0;
    /* pt accounts for the hamburger button (18px top + 40px height + 8px gap) */
    padding: 66px 28px 40px;
    max-width: 100%;
  }

  .hamburger {
    display: flex;
  }
}

@media (max-width: 560px) {
  .content {
    padding: 66px 20px 40px;
  }

  :root {
    --section-gap: 72px;
  }
}

/* Use small/dynamic viewport height on mobile so content fits beneath browser chrome */
@supports (min-height: 100svh) {
  .section-about {
    min-height: 100svh;
  }
}

/* ── REDUCED MOTION ──────────────────────────────────────────── */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }

  html { scroll-behavior: auto; }
}