/* ===========================================================
   Md. Shakil Hossain — Portfolio
   Theme: dark-first, standard transparent (glass) surfaces
   =========================================================== */

:root {
  /* Base palette */
  --bg-page: #0a0e15;
  --bg-page-2: #0d1220;
  --bg-frame: rgba(13, 18, 28, 0.55);
  --bg-frame-solid: rgba(11, 15, 24, 0.86);
  --bg-sidebar: rgba(255, 255, 255, 0.035);
  --bg-card: rgba(255, 255, 255, 0.045);
  --bg-card-hover: rgba(255, 255, 255, 0.07);

  --text-primary: #e8ecf3;
  --text-secondary: #a7b1c2;
  --text-muted: #6b7686;

  --accent: #5b8cff;
  --accent-hover: #7aa0ff;
  --accent-soft: rgba(91, 140, 255, 0.15);
  --accent-rgb: 91, 140, 255;

  --border: rgba(255, 255, 255, 0.09);
  --border-strong: rgba(255, 255, 255, 0.16);

  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 22px;

  --space-xs: 6px;
  --space-sm: 12px;
  --space-md: 20px;
  --space-lg: 36px;

  --shadow-frame: 0 20px 60px rgba(0, 0, 0, 0.45);

  --font-display: 'Space Grotesk', 'Segoe UI', sans-serif;
  --font-body: 'Inter', 'Segoe UI', sans-serif;
  --font-mono: 'JetBrains Mono', ui-monospace, monospace;

  --blur: blur(18px);

  /* Fixed terminal palette — the terminal/code panel always stays dark,
     so its text must NOT flip with the light theme (it would become
     near-invisible against a dark panel otherwise). */
  --term-bg: rgba(6, 9, 15, 0.78);
  --term-border: rgba(255, 255, 255, 0.14);
  --term-bar-bg: rgba(255, 255, 255, 0.05);
  --term-text: #e8ecf3;
  --term-text-secondary: #aab4c6;
  --term-muted: #838ea1;
}

html[data-theme="light"] {
  /* grey-based, not stark white, so transparency still reads clearly */
  --bg-page: #d7dbe3;
  --bg-page-2: #ccd1db;
  --bg-frame: rgba(214, 218, 227, 0.55);
  --bg-frame-solid: rgba(216, 220, 229, 0.9);
  --bg-sidebar: rgba(214, 218, 227, 0.5);
  --bg-card: rgba(255, 255, 255, 0.4);
  --bg-card-hover: rgba(255, 255, 255, 0.62);

  --text-primary: #1c212b;
  --text-secondary: #4a5261;
  --text-muted: #737c8c;

  /* borders kept as visible/defined as the dark theme's */
  --border: rgba(28, 33, 43, 0.22);
  --border-strong: rgba(28, 33, 43, 0.4);

  --shadow-frame: 0 20px 60px rgba(30, 40, 60, 0.18);
}

*, *::before, *::after { box-sizing: border-box; }

:root {
  --t-fast: 0.18s ease;
  --t-base: 0.3s ease;
}

/* Standard, consistent transitions across theme-affected surfaces */
body,
.app-frame,
.sidebar,
.main-content,
.sidebar-nav a,
.theme-toggle,
.availability,
.about-point,
.stat-card,
.tech-cat,
.skill-track,
.project-card,
.filter-btn,
.education-card,
.currently-card,
.contact-row,
.copy-btn,
.terminal-window,
.code-panel,
.mobile-nav,
.mobile-menu,
.hamburger span {
  transition:
    background-color var(--t-base),
    border-color var(--t-base),
    color var(--t-base),
    box-shadow var(--t-base),
    opacity var(--t-fast),
    transform var(--t-fast);
}

html, body {
  height: 100%;
  margin: 0;
  overflow: hidden;
  background: var(--bg-page);
}

body {
  font-family: var(--font-body);
  color: var(--text-primary);
  -webkit-font-smoothing: antialiased;
  background:
    radial-gradient(760px 460px at 82% 8%, rgba(var(--accent-rgb), 0.16), transparent 60%),
    radial-gradient(640px 480px at 6% 92%, rgba(var(--accent-rgb), 0.08), transparent 55%),
    var(--bg-page);
}

h1, h2, h3 { font-family: var(--font-display); margin: 0; letter-spacing: -0.01em; }
p { margin: 0; }
a { color: inherit; text-decoration: none; }
ul { margin: 0; padding: 0; list-style: none; }
button { font: inherit; color: inherit; background: none; border: none; cursor: pointer; }
img { max-width: 100%; display: block; }

.sr-only {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border: 0;
}

.skip-link {
  position: fixed; top: -60px; left: 12px; z-index: 999;
  background: var(--accent); color: #04070d;
  padding: 10px 16px; border-radius: var(--radius-sm);
  font-weight: 600; transition: top 0.2s ease;
}
.skip-link:focus { top: 12px; }

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 4px;
}

.noscript-banner {
  background: var(--accent-soft);
  color: var(--text-primary);
  text-align: center;
  padding: 10px;
  font-size: 0.9rem;
}

/* ===================== APP FRAME ===================== */

.app-frame {
  position: relative;
  z-index: 2;
  height: 100dvh;
  display: flex;
  max-width: 1440px;
  margin: 0 auto;
  padding: 18px;
  gap: 18px;
}

/* ===================== SIDEBAR ===================== */

.sidebar {
  flex: 0 0 262px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  background: var(--bg-sidebar);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  backdrop-filter: var(--blur);
  -webkit-backdrop-filter: var(--blur);
  padding: 22px 18px;
  overflow-y: auto;
  overflow-x: hidden;
}

.profile-block { text-align: center; }

.profile-avatar {
  width: 120px; height: 120px;
  border-radius: 50%;
  object-fit: cover;
  margin: 0 auto 12px;
  border: 2px solid var(--border-strong);
}

.profile-name { font-size: 1.05rem; font-weight: 600; color: var(--text-primary); }
.profile-role { font-size: 0.8rem; color: var(--text-secondary); margin-top: 4px; }

.availability {
  display: inline-flex; align-items: center; gap: 6px;
  margin-top: 12px; font-size: 0.72rem; color: var(--text-secondary);
  background: var(--bg-card);
  border: 1px solid var(--border);
  padding: 5px 10px; border-radius: 999px;
}
.availability i {
  width: 6px; height: 6px; border-radius: 50%;
  background: #3ddc84; box-shadow: 0 0 0 3px rgba(61, 220, 132, 0.2);
}

.sidebar-nav { display: flex; flex-direction: column; gap: 4px; margin-top: 28px; }

.sidebar-nav a {
  display: flex; align-items: center; gap: 12px;
  padding: 10px 12px;
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  font-size: 0.88rem; font-weight: 500;
  border-left: 2px solid transparent;
  transition: color 0.2s ease, background-color 0.2s ease, border-color 0.2s ease;
}
.sidebar-nav a svg {
  width: 18px; height: 18px; flex-shrink: 0;
  fill: none; stroke: currentColor; stroke-width: 1.6;
  stroke-linecap: round; stroke-linejoin: round;
}
.sidebar-nav a:hover { color: var(--text-primary); background: var(--bg-card); }
.sidebar-nav a.active {
  color: var(--accent);
  background: var(--accent-soft);
  border-left-color: var(--accent);
}

.sidebar-bottom { display: flex; flex-direction: column; gap: 10px; }

.theme-toggle {
  display: flex; align-items: center; gap: 10px;
  padding: 9px 12px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  background: var(--bg-card);
  color: var(--text-secondary);
  font-size: 0.82rem;
  width: 100%;
  transition: background-color 0.2s ease, color 0.2s ease;
}
.theme-toggle:hover { background: var(--bg-card-hover); color: var(--text-primary); }
.theme-toggle svg { width: 15px; height: 15px; fill: none; stroke: currentColor; stroke-width: 1.6; stroke-linecap: round; }
.theme-toggle .icon-moon { display: none; }
html[data-theme="light"] .theme-toggle .icon-sun { display: none; }
html[data-theme="light"] .theme-toggle .icon-moon { display: block; }

.copyright { font-size: 0.68rem; color: var(--text-muted); text-align: center; line-height: 1.3; }

/* ===================== MOBILE NAV ===================== */

.mobile-nav { display: none; }
.mobile-menu { display: none; }

/* ===================== MAIN CONTENT ===================== */

.main-content {
  flex: 1;
  overflow-y: auto;
  overflow-x: hidden;
  /* No backdrop-filter here: this element scrolls constantly, and a live
     blur recalculated on a scrolling surface is what was causing the
     occasional scroll "stutter". A slightly higher-opacity flat background
     keeps the transparent look without the per-frame blur cost. */
  background: var(--bg-frame-solid);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-frame);
  scroll-behavior: smooth;
  scrollbar-width: thin;
  scrollbar-color: var(--border-strong) transparent;
}
.main-content::-webkit-scrollbar { width: 8px; }
.main-content::-webkit-scrollbar-thumb { background: var(--border-strong); border-radius: 8px; }

.section {
  min-height: 100%;
  display: flex;
  align-items: center;
  padding: 60px clamp(24px, 5vw, 64px);
}
.section-projects { align-items: flex-start; padding-top: 70px; padding-bottom: 60px; }

.section-inner { width: 100%; max-width: 980px; margin: 0 auto; }

.section-title {
  font-size: clamp(1.6rem, 3vw, 2.1rem);
  margin-bottom: 32px;
  color: var(--text-primary);
}

/* fade-item base (JS drives opacity/transform continuously each frame;
   a short transition just smooths the per-frame steps) */
.js .fade-item {
  will-change: opacity, transform;
  transition: opacity 0.12s linear, transform 0.12s linear;
}
.fade-item { opacity: 1; }

/* ===================== HERO ===================== */

.hero-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 48px;
  align-items: center;
}

.eyebrow-tag {
  color: var(--accent);
  font-family: var(--font-mono);
  font-size: 0.82rem;
  margin-bottom: 14px;
}

.hero-title {
  font-size: clamp(2.4rem, 5.2vw, 3.8rem);
  line-height: 1.05;
  font-weight: 700;
  color: var(--text-primary);
}

.hero-role {
  font-family: var(--font-mono);
  color: var(--accent-hover);
  font-size: 1.05rem;
  margin-top: 18px;
  min-height: 1.4em;
}
.typing-cursor { animation: blink 1s step-end infinite; }
@keyframes blink { 50% { opacity: 0; } }

.hero-bio {
  color: var(--text-secondary);
  font-size: 1rem;
  line-height: 1.6;
  max-width: 46ch;
  margin-top: 18px;
}

.hero-actions { display: flex; gap: 12px; margin-top: 28px; flex-wrap: wrap; }

.btn {
  padding: 12px 22px;
  border-radius: var(--radius-sm);
  font-size: 0.88rem;
  font-weight: 600;
  border: 1px solid transparent;
  transition: transform 0.15s ease, background-color 0.2s ease, border-color 0.2s ease;
  display: inline-block;
}
.btn:hover { transform: translateY(-2px); }
.btn-primary { background: var(--accent); color: #04070d; }
.btn-primary:hover { background: var(--accent-hover); }
.btn-ghost { border-color: var(--border-strong); color: var(--text-primary); background: var(--bg-card); }
.btn-ghost:hover { background: var(--bg-card-hover); }

.hero-links { display: flex; gap: 20px; margin-top: 22px; }
.hero-links a { font-size: 0.85rem; color: var(--text-secondary); border-bottom: 1px solid transparent; }
.hero-links a:hover { color: var(--accent-hover); border-color: var(--accent-hover); }

/* hero visual: terminal + code panel */
.hero-visual { position: relative; }

.terminal-window {
  background: var(--term-bg);
  border: 1px solid var(--term-border);
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: 0 20px 50px rgba(0,0,0,0.35);
}
.terminal-bar {
  display: flex; align-items: center; gap: 8px;
  padding: 10px 14px;
  background: var(--term-bar-bg);
  border-bottom: 1px solid var(--term-border);
}
.dot { width: 9px; height: 9px; border-radius: 50%; }
.dot-r { background: #ff5f57; } .dot-y { background: #febc2e; } .dot-g { background: #28c840; }
.terminal-title { margin-left: 10px; font-family: var(--font-mono); font-size: 0.72rem; color: var(--term-muted); }
.terminal-body { padding: 16px; font-family: var(--font-mono); font-size: 0.82rem; line-height: 1.9; color: var(--term-text); }
.tok-prompt { color: var(--accent-hover); }
.tok-cmd { color: var(--term-text); }
.tok-out { color: var(--term-text-secondary); margin-left: 14px; }
.tok-ok { color: #3ddc84; }
.blink-block { animation: blink 1s step-end infinite; }

.code-panel {
  margin-top: 14px;
  display: flex; flex-direction: column;
  background: var(--term-bg);
  border: 1px solid var(--term-border);
  border-radius: var(--radius-md);
  padding: 14px 16px;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--term-text);
}
.cp-indent { padding-left: 20px; }
.cp-kw { color: #c792ea; }
.cp-fn { color: var(--accent-hover); }
.cp-str { color: #3ddc84; }

/* ===================== ABOUT ===================== */

.about-grid { display: grid; grid-template-columns: 1.4fr 1fr; gap: 40px; align-items: start; }

.about-lead { font-size: 1.15rem; color: var(--text-primary); line-height: 1.6; margin-bottom: 24px; }

.about-points { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.about-point {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 16px 18px;
}
.about-point h3 { font-size: 0.95rem; margin-bottom: 6px; color: var(--text-primary); }
.about-point p { font-size: 0.85rem; color: var(--text-secondary); line-height: 1.55; }

.about-stats { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.stat-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 18px;
  display: flex; flex-direction: column; gap: 4px;
}
.stat-value { font-family: var(--font-display); font-size: 1.9rem; font-weight: 700; color: var(--accent-hover); }
.stat-label { font-size: 0.76rem; color: var(--text-muted); }
.stat-card-text { justify-content: center; }
.stat-text { font-size: 0.95rem; color: var(--text-primary); font-weight: 600; }

/* ===================== STACK ===================== */

.skills-block { display: flex; flex-direction: column; gap: 16px; margin-bottom: 40px; }
.skill-label { display: flex; justify-content: space-between; font-size: 0.85rem; margin-bottom: 6px; color: var(--text-secondary); }
.skill-pct { color: var(--text-muted); font-family: var(--font-mono); font-size: 0.78rem; }
.skill-track {
  height: 8px; border-radius: 999px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  overflow: hidden;
}
.skill-bar {
  height: 100%; width: 0%;
  border-radius: 999px;
  background: linear-gradient(90deg, var(--accent), var(--accent-hover));
  transition: width 1.1s cubic-bezier(0.16, 1, 0.3, 1);
}

.tech-categories { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; }
.tech-cat {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 16px 18px;
}
.tech-cat h3 { font-size: 0.85rem; color: var(--accent-hover); margin-bottom: 10px; }
.tech-cat li { font-size: 0.83rem; color: var(--text-secondary); padding: 3px 0; }

/* ===================== PROJECTS ===================== */

.project-filters { display: flex; gap: 8px; margin-bottom: 26px; flex-wrap: wrap; }
.filter-btn {
  padding: 8px 16px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: var(--bg-card);
  color: var(--text-secondary);
  font-size: 0.82rem;
  transition: background-color 0.2s ease, color 0.2s ease, border-color 0.2s ease;
}
.filter-btn:hover { color: var(--text-primary); }
.filter-btn.active { background: var(--accent-soft); border-color: var(--accent); color: var(--accent-hover); }

.project-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 16px;
}
.project-status { color: var(--text-muted); font-size: 0.9rem; grid-column: 1 / -1; }

.project-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 18px;
  display: flex; flex-direction: column; gap: 10px;
  transition: opacity 0.35s ease, transform 0.35s ease, background-color 0.2s ease, border-color 0.2s ease;
}
.project-card.is-hidden { opacity: 0; transform: scale(0.94); pointer-events: none; position: absolute; }
.project-card:hover { background: var(--bg-card-hover); border-color: var(--border-strong); }
.project-card.featured { border-color: rgba(var(--accent-rgb), 0.4); }

.project-card-head { display: flex; justify-content: space-between; align-items: flex-start; gap: 10px; }
.project-title { font-size: 1rem; font-weight: 600; color: var(--text-primary); }
.project-badge {
  font-size: 0.65rem; font-family: var(--font-mono);
  color: var(--accent-hover); background: var(--accent-soft);
  padding: 3px 8px; border-radius: 999px; white-space: nowrap;
}
.project-desc { font-size: 0.84rem; color: var(--text-secondary); line-height: 1.55; flex: 1; }

.project-tags { display: flex; flex-wrap: wrap; gap: 6px; }
.project-tag { font-size: 0.7rem; color: var(--text-muted); background: rgba(255,255,255,0.04); border: 1px solid var(--border); padding: 3px 8px; border-radius: 6px; }

.project-meta { display: flex; gap: 14px; font-size: 0.75rem; color: var(--text-muted); font-family: var(--font-mono); }

.project-links { display: flex; gap: 10px; margin-top: 4px; }
.project-links a {
  font-size: 0.78rem; color: var(--text-secondary);
  border: 1px solid var(--border); border-radius: var(--radius-sm);
  padding: 6px 12px;
  transition: color 0.2s ease, border-color 0.2s ease;
}
.project-links a:hover { color: var(--accent-hover); border-color: var(--accent); }

/* ===================== EDUCATION ===================== */

.education-card, .currently-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 22px;
  margin-bottom: 18px;
}
.education-card h3 { font-size: 1.1rem; color: var(--text-primary); }
.edu-school { color: var(--accent-hover); font-size: 0.9rem; margin-top: 6px; }
.edu-year { color: var(--text-muted); font-size: 0.82rem; margin-top: 2px; }
.edu-focus { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 16px; }
.edu-focus span { font-size: 0.76rem; color: var(--text-secondary); background: rgba(255,255,255,0.04); border: 1px solid var(--border); padding: 5px 10px; border-radius: 999px; }

.currently-card h3 { font-size: 1rem; margin-bottom: 16px; }
.currently-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.currently-label { font-size: 0.72rem; color: var(--accent-hover); font-family: var(--font-mono); }
.currently-grid p { color: var(--text-secondary); font-size: 0.88rem; margin-top: 6px; line-height: 1.5; }

/* ===================== CONTACT ===================== */

.contact-lead { color: var(--text-secondary); font-size: 1rem; margin-bottom: 28px; max-width: 52ch; }

.contact-rows { display: flex; flex-direction: column; gap: 10px; margin-bottom: 40px; }
.contact-row {
  display: flex; align-items: center; justify-content: space-between;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 16px 20px;
}
.contact-row-main { display: flex; flex-direction: column; gap: 3px; }
.contact-label { font-size: 0.72rem; color: var(--text-muted); font-family: var(--font-mono); }
.contact-value { font-size: 0.95rem; color: var(--text-primary); }
.copy-btn {
  font-size: 0.8rem; font-weight: 600; color: var(--accent-hover);
  border: 1px solid var(--border-strong); border-radius: var(--radius-sm);
  padding: 8px 16px;
  transition: background-color 0.2s ease, color 0.2s ease;
}
.copy-btn:hover { background: var(--accent-soft); }
.copy-btn.copied { color: #3ddc84; border-color: #3ddc84; }

.page-footer { text-align: center; color: var(--text-muted); font-size: 0.78rem; padding-top: 20px; border-top: 1px solid var(--border); }

/* ===================== WATER CURSOR ===================== */

.water-cursor {
  position: fixed; top: 0; left: 0;
  width: 22px; height: 22px;
  border-radius: 60% 60% 62% 62% / 68% 68% 55% 55%;
  background: radial-gradient(circle at 35% 30%, rgba(255,255,255,0.55), rgba(var(--accent-rgb), 0.55) 45%, rgba(var(--accent-rgb), 0.15) 75%);
  transform: translate(-50%, -50%);
  pointer-events: none;
  z-index: 9999;
  mix-blend-mode: screen;
  opacity: 0;
  transition: opacity 0.25s ease;
}
.water-cursor.active { opacity: 0.9; }

.water-trail {
  position: fixed; top: 0; left: 0;
  width: 8px; height: 8px;
  border-radius: 50%;
  background: rgba(var(--accent-rgb), 0.45);
  transform: translate(-50%, -50%);
  pointer-events: none;
  z-index: 9998;
}

.water-ripple {
  position: fixed; top: 0; left: 0;
  width: 14px; height: 14px;
  border: 1.5px solid rgba(var(--accent-rgb), 0.7);
  border-radius: 50%;
  transform: translate(-50%, -50%) scale(1);
  pointer-events: none;
  z-index: 9998;
  opacity: 0.8;
}

/* ===================== OUTER DECORATIVE CANVAS ===================== */

.outer-canvas { position: fixed; inset: 0; z-index: 0; pointer-events: none; overflow: hidden; }
.deco { position: absolute; color: var(--text-muted); opacity: 0.18; font-family: var(--font-mono); }
.deco-1 { top: 6%; left: 3%; font-size: 2.2rem; animation: floatY 13s ease-in-out infinite; }
.deco-2 { bottom: 10%; left: 5%; font-size: 1.6rem; animation: floatY 15s ease-in-out infinite reverse; }
.deco-3.deco-ring { top: 14%; right: 4%; width: 46px; height: 46px; border: 1px solid var(--text-muted); border-radius: 50%; animation: spin 22s linear infinite; }
.deco-4.deco-dot { bottom: 22%; right: 8%; width: 8px; height: 8px; border-radius: 50%; background: var(--accent); opacity: 0.3; animation: floatY 10s ease-in-out infinite; }
.deco-5.deco-diamond { top: 46%; right: 2%; width: 14px; height: 14px; border: 1px solid var(--text-muted); transform: rotate(45deg); animation: floatY 12s ease-in-out infinite; }
.deco-6.deco-line { bottom: 4%; left: 40%; width: 60px; height: 1px; background: var(--text-muted); animation: floatY 14s ease-in-out infinite; }
.deco-7 { top: 60%; left: 1.5%; font-size: 1.8rem; animation: floatY 15s ease-in-out infinite; }

@keyframes floatY { 0%, 100% { transform: translateY(0); } 50% { transform: translateY(-16px); } }
@keyframes spin { from { transform: rotate(0deg); } to { transform: rotate(360deg); } }

/* ===================== RESPONSIVE ===================== */

@media (max-width: 800px) {
  .app-frame { flex-direction: column; padding: 0; gap: 0; height: 100dvh; }
  .sidebar { display: none; }
  .outer-canvas { display: none; }

  .mobile-nav {
    display: flex; align-items: center; justify-content: space-between;
    padding: 14px 18px;
    background: var(--bg-sidebar);
    border-bottom: 1px solid var(--border);
    backdrop-filter: var(--blur);
    -webkit-backdrop-filter: var(--blur);
    position: relative; z-index: 5;
  }
  .mobile-brand { display: flex; align-items: center; gap: 10px; font-weight: 600; font-size: 0.95rem; }
  .mobile-avatar { width: 32px; height: 32px; border-radius: 50%; object-fit: cover; }

  .hamburger { width: 32px; height: 24px; position: relative; }
  .hamburger span {
    position: absolute; left: 0; width: 100%; height: 2px; background: var(--text-primary);
    border-radius: 2px; transition: transform 0.25s ease, opacity 0.2s ease;
  }
  .hamburger span:nth-child(1) { top: 0; }
  .hamburger span:nth-child(2) { top: 11px; }
  .hamburger span:nth-child(3) { top: 22px; }
  .hamburger[aria-expanded="true"] span:nth-child(1) { transform: translateY(11px) rotate(45deg); }
  .hamburger[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
  .hamburger[aria-expanded="true"] span:nth-child(3) { transform: translateY(-11px) rotate(-45deg); }

  .mobile-menu {
    display: flex; flex-direction: column;
    max-height: 0; overflow: hidden;
    background: var(--bg-sidebar);
    backdrop-filter: var(--blur); -webkit-backdrop-filter: var(--blur);
    transition: max-height 0.3s ease;
    position: relative; z-index: 4;
  }
  .mobile-menu.open { max-height: 340px; }
  .mobile-menu a { padding: 14px 20px; border-top: 1px solid var(--border); color: var(--text-secondary); font-size: 0.9rem; }
  .mobile-menu a.active { color: var(--accent-hover); }

  .main-content { border-radius: 0; border: none; margin: 0; }
  .section { padding: 40px 20px; }

  .hero-grid { grid-template-columns: 1fr; }
  .hero-visual { order: -1; }
  .about-grid { grid-template-columns: 1fr; }
  .about-points { grid-template-columns: 1fr; }
  .about-stats { grid-template-columns: 1fr 1fr; }
  .tech-categories { grid-template-columns: 1fr 1fr; }
  .currently-grid { grid-template-columns: 1fr; }

  .water-cursor, .water-trail, .water-ripple { display: none; }
}

@media (max-width: 460px) {
  .tech-categories { grid-template-columns: 1fr; }
  .about-stats { grid-template-columns: 1fr; }
  .hero-actions { flex-direction: column; align-items: stretch; }
}

/* ===================== REDUCED MOTION ===================== */

@media (prefers-reduced-motion: reduce) {
  * { animation-duration: 0.001ms !important; animation-iteration-count: 1 !important; }
  html { scroll-behavior: auto; }
  .main-content { scroll-behavior: auto; }
  .water-cursor, .water-trail, .water-ripple, .outer-canvas { display: none; }
}