/* ==========================================================================
   BALAJI DEVKATTE — DATA ANALYST PORTFOLIO
   Design tokens: dark navy base, blue -> cyan accent gradient, glassmorphism,
   Poppins (display) + Inter (body) + JetBrains Mono (data/stat figures).
   ========================================================================== */

:root{
  /* --- Color tokens (dark, default) --- */
  --bg-base: #080b12;
  --bg-elevated: #0d121c;
  --bg-elevated-2: #10161f;
  --surface: rgba(255,255,255,0.045);
  --surface-strong: rgba(255,255,255,0.07);
  --border-soft: rgba(255,255,255,0.09);
  --border-strong: rgba(255,255,255,0.16);

  --text-primary: #eef2fb;
  --text-secondary: #aab3c5;
  --text-muted: #6b7386;

  --accent-1: #4f8cff;
  --accent-2: #38e1d0;
  --accent-gradient: linear-gradient(120deg, var(--accent-1), var(--accent-2));
  --accent-glow: rgba(79,140,255,0.35);

  --success: #34d399;
  --danger: #f87171;

  /* --- Type --- */
  --font-display: 'Poppins', sans-serif;
  --font-body: 'Inter', sans-serif;
  --font-mono: 'JetBrains Mono', monospace;

  /* --- Layout --- */
  --page-max: 1180px;
  --radius-sm: 10px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --shadow-soft: 0 20px 60px -20px rgba(0,0,0,0.6);
  --shadow-glow: 0 0 0 1px rgba(255,255,255,0.06), 0 20px 50px -18px rgba(79,140,255,0.35);

  --nav-h: 76px;
  --ease: cubic-bezier(.16,.84,.44,1);
}

/* ---------- Light theme override ---------- */
[data-theme="light"]{
  --bg-base: #f5f7fb;
  --bg-elevated: #ffffff;
  --bg-elevated-2: #eef1f7;
  --surface: rgba(15,23,42,0.035);
  --surface-strong: rgba(15,23,42,0.06);
  --border-soft: rgba(15,23,42,0.09);
  --border-strong: rgba(15,23,42,0.16);

  --text-primary: #0f1520;
  --text-secondary: #495166;
  --text-muted: #7c869b;

  --accent-glow: rgba(79,140,255,0.22);
  --shadow-soft: 0 20px 50px -24px rgba(15,23,42,0.25);
  --shadow-glow: 0 0 0 1px rgba(15,23,42,0.06), 0 20px 50px -18px rgba(79,140,255,0.22);
}

/* ---------- Reset ---------- */
*, *::before, *::after{ box-sizing: border-box; margin: 0; padding: 0; }
html{ scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce){
  html{ scroll-behavior: auto; }
  *, *::before, *::after{ animation-duration: 0.001ms !important; animation-iteration-count: 1 !important; transition-duration: 0.001ms !important; scroll-behavior: auto !important; }
}

body{
  background: var(--bg-base);
  color: var(--text-primary);
  font-family: var(--font-body);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
  transition: background 0.4s var(--ease), color 0.4s var(--ease);
}

img{ max-width: 100%; display: block; }
a{ color: inherit; text-decoration: none; }
ul{ list-style: none; }
button{ font: inherit; cursor: pointer; border: none; background: none; color: inherit; }
input, textarea{ font: inherit; color: inherit; }

.skip-link{
  position: absolute; top: -100px; left: 16px; z-index: 1000;
  background: var(--accent-gradient); color: #04101f;
  padding: 12px 20px; border-radius: var(--radius-sm);
  font-weight: 600; text-decoration: none;
  transition: top 0.2s var(--ease);
}
.skip-link:focus{ top: 16px; }

::selection{ background: var(--accent-1); color: #fff; }

:focus-visible{
  outline: 2px solid var(--accent-1);
  outline-offset: 3px;
  border-radius: 4px;
}

h1,h2,h3,h4{ font-family: var(--font-display); font-weight: 700; line-height: 1.15; letter-spacing: -0.01em; }

/* ---------- Utility ---------- */
.section{ padding: 130px 0; position: relative; }
.section-alt{ background: linear-gradient(180deg, transparent, var(--surface) 8%, var(--surface) 92%, transparent); }
.section-inner{ max-width: var(--page-max); margin: 0 auto; padding: 0 32px; }
.accent-text{ background: var(--accent-gradient); -webkit-background-clip: text; background-clip: text; color: transparent; }

.section-eyebrow{
  font-family: var(--font-mono);
  font-size: 0.8rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent-1);
  margin-bottom: 14px;
  display: flex; align-items: center; gap: 8px;
}
.section-eyebrow::before{ content: ''; width: 22px; height: 1px; background: var(--accent-gradient); display: inline-block; }
.section-title{ font-size: clamp(1.8rem, 3.2vw, 2.6rem); margin-bottom: 18px; max-width: 620px; }
.section-lead{ color: var(--text-secondary); max-width: 560px; margin-bottom: 50px; font-size: 1.02rem; }
.center{ margin-left: auto; margin-right: auto; text-align: center; }
.center::before{ display: none; }
#skills .section-eyebrow.center, #projects .section-eyebrow.center, #education .section-eyebrow.center{ justify-content: center; }
#skills .section-eyebrow.center::before, #projects .section-eyebrow.center::before, #education .section-eyebrow.center::before{ display: none; }

/* ---------- Buttons ---------- */
.btn{
  display: inline-flex; align-items: center; gap: 10px;
  padding: 14px 26px;
  border-radius: 100px;
  font-weight: 600;
  font-size: 0.95rem;
  transition: transform 0.25s var(--ease), box-shadow 0.25s var(--ease), background 0.25s var(--ease), border-color .25s var(--ease);
  white-space: nowrap;
}
.btn-sm{ padding: 9px 18px; font-size: 0.85rem; }
.btn-primary{
  background: var(--accent-gradient);
  color: #04101f;
  box-shadow: 0 12px 30px -10px var(--accent-glow);
}
.btn-primary:hover{ transform: translateY(-2px); box-shadow: 0 16px 36px -8px var(--accent-glow); }
.btn-glass{
  background: var(--surface);
  border: 1px solid var(--border-soft);
  color: var(--text-primary);
  backdrop-filter: blur(12px);
}
.btn-glass:hover{ background: var(--surface-strong); transform: translateY(-2px); border-color: var(--border-strong); }
.btn-ghost{ color: var(--text-secondary); border: 1px solid transparent; }
.btn-ghost:hover{ color: var(--text-primary); }

/* ==========================================================================
   LOADER
   ========================================================================== */
.loader{
  position: fixed; inset: 0; z-index: 9999;
  background: var(--bg-base);
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  gap: 18px;
  transition: opacity 0.6s var(--ease), visibility 0.6s var(--ease);
}
.loader.hidden{ opacity: 0; visibility: hidden; pointer-events: none; }
.loader-mark{ animation: pulse-loader 1.4s ease-in-out infinite; }
@keyframes pulse-loader{ 0%,100%{ transform: scale(1); opacity: 1; } 50%{ transform: scale(1.12); opacity: 0.7; } }
.loader-text{ font-family: var(--font-mono); font-size: 0.85rem; letter-spacing: 0.08em; color: var(--text-secondary); text-transform: uppercase; }
.dots span{ animation: dot-blink 1.4s infinite; opacity: 0; }
.dots span:nth-child(2){ animation-delay: 0.2s; }
.dots span:nth-child(3){ animation-delay: 0.4s; }
@keyframes dot-blink{ 0%,100%{ opacity: 0; } 50%{ opacity: 1; } }

/* ==========================================================================
   SCROLL PROGRESS
   ========================================================================== */
.scroll-progress{
  position: fixed; top: 0; left: 0; height: 3px; width: 0%;
  background: var(--accent-gradient);
  z-index: 1001;
  transition: width 0.1s linear;
}

/* ==========================================================================
   NAVBAR
   ========================================================================== */
.navbar{
  position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
  height: var(--nav-h);
  display: flex; align-items: center;
  background: transparent;
  transition: background 0.35s var(--ease), border-color 0.35s var(--ease), backdrop-filter 0.35s var(--ease);
  border-bottom: 1px solid transparent;
}
.navbar.scrolled{
  background: rgba(8,11,18,0.72);
  backdrop-filter: blur(16px) saturate(140%);
  border-bottom: 1px solid var(--border-soft);
}
[data-theme="light"] .navbar.scrolled{ background: rgba(245,247,251,0.78); }

.nav-inner{
  max-width: var(--page-max); width: 100%; margin: 0 auto; padding: 0 32px;
  display: flex; align-items: center; justify-content: space-between; gap: 24px;
}
.nav-logo{ display: flex; align-items: center; gap: 10px; font-family: var(--font-display); font-weight: 700; font-size: 1.15rem; }
.nav-links{ display: flex; gap: 8px; }
.nav-link{
  padding: 8px 16px; border-radius: 100px; font-size: 0.92rem; color: var(--text-secondary);
  transition: color 0.25s var(--ease), background 0.25s var(--ease);
  position: relative;
}
.nav-link:hover{ color: var(--text-primary); }
.nav-link.active{ color: var(--text-primary); background: var(--surface); }
.nav-actions{ display: flex; align-items: center; gap: 12px; }
.theme-toggle{
  width: 40px; height: 40px; border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  background: var(--surface); border: 1px solid var(--border-soft);
  color: var(--text-primary); font-size: 0.95rem;
  transition: background 0.25s var(--ease), transform 0.25s var(--ease);
}
.theme-toggle:hover{ background: var(--surface-strong); transform: rotate(15deg); }
.nav-resume{ display: none; }
.nav-burger{
  display: none; flex-direction: column; gap: 5px; width: 40px; height: 40px;
  align-items: center; justify-content: center;
}
.nav-burger span{ width: 20px; height: 2px; background: var(--text-primary); border-radius: 2px; transition: transform 0.3s var(--ease), opacity 0.3s var(--ease); }
.nav-burger.open span:nth-child(1){ transform: translateY(7px) rotate(45deg); }
.nav-burger.open span:nth-child(2){ opacity: 0; }
.nav-burger.open span:nth-child(3){ transform: translateY(-7px) rotate(-45deg); }

@media (min-width: 861px){ .nav-resume{ display: inline-flex; } }

/* ==========================================================================
   HERO
   ========================================================================== */
.hero{
  position: relative;
  min-height: 100vh;
  display: flex; align-items: center;
  padding: calc(var(--nav-h) + 40px) 32px 80px;
  overflow: hidden;
}
.hero-bg{ position: absolute; inset: 0; z-index: -1; }
.grid-lines{
  position: absolute; inset: 0;
  background-image:
    linear-gradient(var(--border-soft) 1px, transparent 1px),
    linear-gradient(90deg, var(--border-soft) 1px, transparent 1px);
  background-size: 64px 64px;
  mask-image: radial-gradient(ellipse 70% 60% at 50% 30%, #000 10%, transparent 75%);
  opacity: 0.6;
}
.glow{ position: absolute; border-radius: 50%; filter: blur(110px); opacity: 0.55; }
.glow-1{ width: 480px; height: 480px; background: var(--accent-1); top: -120px; left: -100px; }
.glow-2{ width: 420px; height: 420px; background: var(--accent-2); bottom: -140px; right: -80px; opacity: 0.35; }

.hero-inner{
  max-width: var(--page-max); margin: 0 auto; width: 100%;
  display: grid; grid-template-columns: 1.05fr 0.95fr; gap: 60px; align-items: center;
}

.hero-greeting{
  font-family: var(--font-display); font-weight: 600; font-size: 1.05rem;
  color: var(--text-secondary); margin-bottom: 14px;
  display: flex; align-items: center; gap: 8px;
}
.hero-greeting .wave{ display: inline-block; animation: wave-hand 2.4s ease-in-out infinite; transform-origin: 70% 70%; }
@keyframes wave-hand{
  0%, 60%, 100%{ transform: rotate(0deg); }
  10%{ transform: rotate(14deg); }
  20%{ transform: rotate(-8deg); }
  30%{ transform: rotate(14deg); }
  40%{ transform: rotate(-4deg); }
  50%{ transform: rotate(10deg); }
}

.eyebrow{
  display: inline-flex; align-items: center; gap: 9px;
  font-family: var(--font-mono); font-size: 0.82rem; letter-spacing: 0.04em;
  color: var(--text-secondary);
  background: var(--surface); border: 1px solid var(--border-soft);
  padding: 7px 14px; border-radius: 100px; margin-bottom: 26px;
}
.live-dot{
  width: 7px; height: 7px; border-radius: 50%; background: var(--success);
  box-shadow: 0 0 0 0 rgba(52,211,153,0.6);
  animation: live-pulse 2s infinite;
}
.live-dot.small{ width: 6px; height: 6px; }
@keyframes live-pulse{
  0%{ box-shadow: 0 0 0 0 rgba(52,211,153,0.55); }
  70%{ box-shadow: 0 0 0 8px rgba(52,211,153,0); }
  100%{ box-shadow: 0 0 0 0 rgba(52,211,153,0); }
}

.hero-title{ font-size: clamp(2.3rem, 4.6vw, 3.5rem); margin-bottom: 18px; }
.type-wrap{ color: var(--accent-1); position: relative; }
.cursor-blink{ animation: blink 1s step-end infinite; color: var(--accent-2); }
@keyframes blink{ 50%{ opacity: 0; } }

.hero-sub{
  font-family: var(--font-mono); color: var(--text-secondary); font-size: 1rem; min-height: 1.6em; margin-bottom: 22px;
}
.hero-intro{ color: var(--text-secondary); max-width: 540px; margin-bottom: 34px; font-size: 1.02rem; }

.hero-buttons{ display: flex; flex-wrap: wrap; gap: 14px; margin-bottom: 34px; }
.hero-tags{ display: flex; flex-wrap: wrap; gap: 10px; }
.hero-tags span{
  font-family: var(--font-mono); font-size: 0.78rem; color: var(--text-muted);
  border: 1px solid var(--border-soft); padding: 6px 12px; border-radius: 8px;
}

/* --- Hero signature panel --- */
.hero-panel{ perspective: 1200px; }
.panel-glass{
  background: linear-gradient(160deg, var(--surface-strong), var(--surface));
  border: 1px solid var(--border-soft);
  border-radius: var(--radius-lg);
  padding: 26px;
  box-shadow: var(--shadow-glow);
  backdrop-filter: blur(20px);
  transition: transform 0.15s ease-out;
}
.panel-head{ display: flex; align-items: center; gap: 12px; margin-bottom: 22px; }
.panel-dots{ display: flex; gap: 6px; }
.panel-dots i{ width: 9px; height: 9px; border-radius: 50%; background: var(--border-strong); display: block; }
.panel-title{ font-family: var(--font-mono); font-size: 0.78rem; color: var(--text-muted); flex: 1; }
.live-badge{
  font-family: var(--font-mono); font-size: 0.7rem; text-transform: uppercase; letter-spacing: 0.06em;
  color: var(--success); display: flex; align-items: center; gap: 6px;
  background: rgba(52,211,153,0.1); padding: 4px 9px; border-radius: 100px;
}

.panel-kpis{ display: grid; grid-template-columns: repeat(2, 1fr); gap: 14px; margin-bottom: 24px; }
.kpi{ background: var(--surface); border: 1px solid var(--border-soft); border-radius: var(--radius-sm); padding: 16px; }
.kpi-num{ display: block; font-family: var(--font-mono); font-size: 1.7rem; font-weight: 600; color: var(--text-primary); }
.kpi-label{ display: block; font-size: 0.72rem; color: var(--text-muted); margin-top: 4px; }

.panel-chart{ background: var(--surface); border: 1px solid var(--border-soft); border-radius: var(--radius-sm); padding: 18px 18px 14px; }
.panel-chart svg{ width: 100%; height: 90px; display: block; }
.chart-line{ stroke-dasharray: 500; stroke-dashoffset: 500; animation: draw-line 2.2s var(--ease) 0.4s forwards; }
@keyframes draw-line{ to{ stroke-dashoffset: 0; } }
.chart-area{ opacity: 0; animation: fade-in 1.2s ease 1.6s forwards; }
@keyframes fade-in{ to{ opacity: 1; } }
.chart-caption{ display: flex; justify-content: space-between; align-items: center; margin-top: 10px; font-size: 0.74rem; color: var(--text-muted); flex-wrap: wrap; gap: 6px; }
.chart-trend{ color: var(--success); display: flex; align-items: center; gap: 5px; }

.scroll-cue{
  position: absolute; bottom: 28px; left: 50%; transform: translateX(-50%);
  display: flex; flex-direction: column; align-items: center; gap: 8px;
  font-family: var(--font-mono); font-size: 0.72rem; color: var(--text-muted); letter-spacing: 0.08em;
}
.scroll-cue span{
  width: 1px; height: 26px; background: linear-gradient(var(--accent-1), transparent);
  animation: scroll-cue-move 1.8s ease-in-out infinite;
}
@keyframes scroll-cue-move{ 0%{ transform: scaleY(0.4); opacity: 0.4; } 50%{ transform: scaleY(1); opacity: 1; } 100%{ transform: scaleY(0.4); opacity: 0.4; } }

/* ==========================================================================
   REVEAL ANIMATION
   ========================================================================== */
.reveal{ opacity: 0; transform: translateY(28px); transition: opacity 0.75s var(--ease), transform 0.75s var(--ease); }
.reveal.in-view{ opacity: 1; transform: translateY(0); }

/* ==========================================================================
   ABOUT
   ========================================================================== */
.about-grid{ display: grid; grid-template-columns: 0.8fr 1.2fr; gap: 70px; align-items: center; }
.about-media{ position: relative; }
.about-visual-frame{
  border-radius: var(--radius-lg);
  padding: 8px;
  background: linear-gradient(160deg, var(--accent-1), transparent 60%);
  box-shadow: var(--shadow-soft);
}
.about-illustration{
  display: block;
  width: 100%; height: 440px;
  border-radius: calc(var(--radius-lg) - 8px);
  overflow: hidden;
}
.about-illo-card{ fill: var(--bg-elevated-2); }
.about-illo-label{ font-family: var(--font-mono); font-size: 13px; fill: var(--text-muted); letter-spacing: 0.3px; }
.about-illo-divider{ stroke: var(--border-soft); stroke-width: 1; }
.about-illo-ring-bg{ fill: none; stroke: var(--border-soft); stroke-width: 14; }
.about-illo-pct{ font-family: var(--font-mono); font-size: 22px; font-weight: 600; fill: var(--text-primary); }
.about-illo-chip{ fill: var(--border-soft); }
.about-stat-chip{
  position: absolute; bottom: -26px; right: -18px;
  background: var(--bg-elevated);
  border: 1px solid var(--border-soft);
  border-radius: var(--radius-md);
  padding: 16px 20px;
  display: flex; align-items: center; gap: 14px;
  box-shadow: var(--shadow-soft);
}
.about-stat-chip i{ font-size: 1.4rem; color: var(--accent-1); }
.about-stat-chip strong{ display: block; font-family: var(--font-mono); font-size: 1.3rem; }
.about-stat-chip span{ font-size: 0.72rem; color: var(--text-muted); max-width: 130px; display: block; }

.about-name{ font-size: clamp(1.5rem, 2.6vw, 1.9rem); margin-bottom: 4px; }
.about-role{
  font-family: var(--font-mono); font-size: 0.82rem; color: var(--text-secondary);
  text-transform: uppercase; letter-spacing: 0.1em; margin-bottom: 20px;
}
.about-copy p{ color: var(--text-secondary); margin-bottom: 18px; }
.about-copy em{ color: var(--text-primary); font-style: normal; border-bottom: 1px dashed var(--border-strong); }
.about-list{ display: grid; grid-template-columns: 1fr 1fr; gap: 12px; margin-top: 28px; }
.about-list li{ display: flex; align-items: center; gap: 10px; font-size: 0.92rem; color: var(--text-secondary); }
.about-list i{ color: var(--accent-1); width: 18px; text-align: center; }

/* ==========================================================================
   SKILLS
   ========================================================================== */
.skills-grid{ display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; margin-bottom: 50px; }
.skill-card{
  background: var(--surface); border: 1px solid var(--border-soft);
  border-radius: var(--radius-md); padding: 24px;
  transition: transform 0.3s var(--ease), border-color 0.3s var(--ease), background 0.3s var(--ease);
}
.skill-card:hover{ transform: translateY(-5px); border-color: var(--border-strong); background: var(--surface-strong); }
.skill-top{ display: flex; align-items: center; gap: 12px; margin-bottom: 16px; }
.skill-icon{
  width: 38px; height: 38px; border-radius: 10px;
  display: flex; align-items: center; justify-content: center;
  background: var(--accent-gradient); color: #04101f; font-size: 1rem; flex-shrink: 0;
}
.skill-name{ font-weight: 600; flex: 1; }
.skill-pct{ font-family: var(--font-mono); font-size: 0.82rem; color: var(--text-muted); }
.skill-bar{ height: 6px; border-radius: 100px; background: var(--surface-strong); overflow: hidden; margin-bottom: 14px; }
.skill-fill{ height: 100%; width: 0%; border-radius: 100px; background: var(--accent-gradient); transition: width 1.4s var(--ease); }
.skill-desc{ font-size: 0.83rem; color: var(--text-muted); }

.concept-tags{ display: flex; flex-wrap: wrap; gap: 12px; justify-content: center; }
.concept-tags span{
  font-size: 0.85rem; color: var(--text-secondary);
  border: 1px solid var(--border-soft); padding: 9px 16px; border-radius: 100px;
  display: inline-flex; align-items: center; gap: 8px;
  transition: border-color 0.25s var(--ease), color 0.25s var(--ease);
}
.concept-tags span:hover{ border-color: var(--accent-1); color: var(--text-primary); }
.concept-tags i{ color: var(--accent-1); }

/* ==========================================================================
   LEARNING JOURNEY
   ========================================================================== */
.journey-track{
  display: flex; flex-wrap: wrap; align-items: center; justify-content: center;
  gap: 14px; max-width: 980px; margin: 0 auto;
}
.journey-step{
  background: var(--surface); border: 1px solid var(--border-soft); border-radius: 100px;
  padding: 12px 22px; display: flex; align-items: center; gap: 10px;
  font-size: 0.92rem; font-weight: 500; white-space: nowrap;
  transition: transform 0.3s var(--ease), border-color 0.3s var(--ease), background 0.3s var(--ease);
}
.journey-step:hover{ transform: translateY(-3px); border-color: var(--border-strong); background: var(--surface-strong); }
.journey-index{ font-family: var(--font-mono); font-size: 0.74rem; color: var(--accent-1); }
.journey-step-final{ background: var(--accent-gradient); color: #04101f; font-weight: 600; border-color: transparent; }
.journey-step-final .journey-index{ color: #04101f; }
.journey-arrow{ color: var(--accent-1); opacity: 0.55; font-size: 0.85rem; transform: rotate(-90deg); }

@media (max-width: 780px){
  .journey-track{ flex-direction: column; }
  .journey-arrow{ transform: none; }
  .journey-step{ white-space: normal; text-align: center; }
}

/* ==========================================================================
   STATISTICS
   ========================================================================== */
.stats-section{
  padding: 56px 0;
  border-top: 1px solid var(--border-soft);
  border-bottom: 1px solid var(--border-soft);
  background: var(--surface);
}
.stats-grid{ display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; text-align: center; }
.stat-item{ display: flex; flex-direction: column; gap: 6px; }
.stat-num{
  font-family: var(--font-mono); font-weight: 600; font-size: clamp(1.7rem, 3vw, 2.4rem);
  background: var(--accent-gradient); -webkit-background-clip: text; background-clip: text; color: transparent;
}
.stat-label{ font-size: 0.82rem; color: var(--text-secondary); }

@media (max-width: 640px){
  .stats-grid{ grid-template-columns: repeat(2, 1fr); gap: 28px 16px; }
}

/* ==========================================================================
   PROJECTS
   ========================================================================== */
.filter-bar{ display: flex; justify-content: center; gap: 10px; margin-bottom: 46px; flex-wrap: wrap; }
.filter-btn{
  padding: 10px 20px; border-radius: 100px; font-size: 0.88rem; font-weight: 500;
  border: 1px solid var(--border-soft); color: var(--text-secondary);
  transition: all 0.25s var(--ease);
}
.filter-btn:hover{ color: var(--text-primary); border-color: var(--border-strong); }
.filter-btn.active{ background: var(--accent-gradient); color: #04101f; border-color: transparent; font-weight: 600; }

.projects-grid{ display: grid; grid-template-columns: repeat(2, 1fr); gap: 30px; }
.project-card{
  background: linear-gradient(165deg, var(--surface-strong), var(--surface));
  border: 1px solid var(--border-soft);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: transform 0.4s var(--ease), box-shadow 0.4s var(--ease), border-color 0.4s var(--ease);
  display: flex; flex-direction: column;
}
.project-card.hidden-card{ display: none; }
.project-card:hover{ transform: translateY(-8px); box-shadow: var(--shadow-glow); border-color: var(--border-strong); }

.project-media{ position: relative; aspect-ratio: 16/9; overflow: hidden; background: var(--bg-elevated-2); }
.project-media picture{ display: block; width: 100%; height: 100%; }
.project-media img{ width: 100%; height: 100%; object-fit: cover; object-position: top; transition: transform 0.6s var(--ease); }
.project-card:hover .project-media img{ transform: scale(1.06); }
.project-tool-badge{
  position: absolute; top: 14px; right: 14px;
  font-size: 0.74rem; font-family: var(--font-mono);
  background: rgba(8,11,18,0.75); color: #fff; border: 1px solid rgba(255,255,255,0.16);
  padding: 6px 12px; border-radius: 100px; display: flex; align-items: center; gap: 6px;
  backdrop-filter: blur(6px);
}

.project-body{ padding: 26px; display: flex; flex-direction: column; gap: 16px; flex: 1; }
.project-body h3{ font-size: 1.2rem; }
.project-body > p{ color: var(--text-secondary); font-size: 0.92rem; }
.project-meta-block{
  background: var(--surface); border: 1px solid var(--border-soft); border-radius: var(--radius-sm);
  padding: 14px 16px; display: flex; flex-direction: column; gap: 8px;
}
.meta-label{
  font-family: var(--font-mono); font-size: 0.7rem; text-transform: uppercase; letter-spacing: 0.08em;
  color: var(--accent-1); display: flex; align-items: center; gap: 6px;
}
.project-meta-block > p{ font-size: 0.85rem; color: var(--text-secondary); }
.project-features{ display: flex; flex-direction: column; gap: 6px; }
.project-features li{ position: relative; padding-left: 18px; font-size: 0.85rem; color: var(--text-secondary); }
.project-features li::before{ content: '\2192'; position: absolute; left: 0; color: var(--accent-1); }
.project-stack{ display: flex; flex-wrap: wrap; gap: 8px; }
.project-stack span{ font-family: var(--font-mono); font-size: 0.72rem; color: var(--text-muted); border: 1px solid var(--border-soft); padding: 4px 10px; border-radius: 6px; }
.project-actions{ display: flex; gap: 10px; margin-top: auto; padding-top: 8px; }
.project-actions .btn{ flex: 1; justify-content: center; }

/* ==========================================================================
   EDUCATION TIMELINE
   ========================================================================== */
.timeline{ position: relative; max-width: 680px; margin: 0 auto; padding-left: 34px; }
.timeline::before{ content: ''; position: absolute; left: 5px; top: 6px; bottom: 6px; width: 2px; background: linear-gradient(var(--accent-1), var(--accent-2)); opacity: 0.4; }
.timeline-item{ position: relative; margin-bottom: 36px; }
.timeline-item:last-child{ margin-bottom: 0; }
.timeline-dot{
  position: absolute; left: -34px; top: 6px; width: 12px; height: 12px; border-radius: 50%;
  background: var(--accent-gradient); box-shadow: 0 0 0 4px var(--bg-base), 0 0 0 5px var(--border-soft);
}
.timeline-card{
  background: var(--surface); border: 1px solid var(--border-soft); border-radius: var(--radius-md);
  padding: 22px 26px;
}
.timeline-tag{
  font-family: var(--font-mono); font-size: 0.7rem; text-transform: uppercase; letter-spacing: 0.06em;
  color: var(--accent-1); display: inline-block; margin-bottom: 8px;
}
.timeline-card h3{ font-size: 1.08rem; margin-bottom: 6px; }
.timeline-card p{ color: var(--text-secondary); font-size: 0.9rem; }

/* ==========================================================================
   CONTACT
   ========================================================================== */
.contact-grid{ display: grid; grid-template-columns: 1fr 1fr; gap: 60px; }
.contact-info p{ color: var(--text-secondary); margin-bottom: 30px; max-width: 460px; }
.contact-icons{ display: flex; gap: 16px; margin-bottom: 34px; }
.contact-icon-btn{
  width: 54px; height: 54px; border-radius: 16px;
  display: flex; align-items: center; justify-content: center;
  background: var(--surface); border: 1px solid var(--border-soft);
  font-size: 1.2rem; color: var(--text-primary);
  transition: transform 0.25s var(--ease), background 0.25s var(--ease), border-color 0.25s var(--ease), color 0.25s var(--ease), box-shadow 0.25s var(--ease);
}
.contact-icon-btn:hover, .contact-icon-btn:focus-visible{
  transform: translateY(-4px);
  background: var(--accent-gradient); color: #04101f; border-color: transparent;
  box-shadow: var(--shadow-glow);
}

.social-icons{ display: flex; gap: 12px; }
.social-icons a{
  width: 42px; height: 42px; border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  background: var(--surface); border: 1px solid var(--border-soft);
  transition: transform 0.25s var(--ease), background 0.25s var(--ease), color 0.25s var(--ease);
}
.social-icons a:hover{ transform: translateY(-4px); background: var(--accent-gradient); color: #04101f; }

.contact-form{
  background: var(--surface); border: 1px solid var(--border-soft); border-radius: var(--radius-lg);
  padding: 34px; display: flex; flex-direction: column; gap: 18px;
}
.form-row{ display: flex; flex-direction: column; gap: 8px; }
.form-row label{ font-size: 0.82rem; color: var(--text-secondary); }
.form-row input, .form-row textarea{
  background: var(--bg-elevated); border: 1px solid var(--border-soft); border-radius: var(--radius-sm);
  padding: 13px 16px; transition: border-color 0.25s var(--ease), box-shadow 0.25s var(--ease);
  resize: vertical;
}
.form-row input:focus, .form-row textarea:focus{ border-color: var(--accent-1); box-shadow: 0 0 0 3px var(--accent-glow); outline: none; }
.form-row.invalid input, .form-row.invalid textarea{ border-color: var(--danger); }
.form-error{ font-size: 0.76rem; color: var(--danger); min-height: 1em; }
.form-submit{ justify-content: center; margin-top: 8px; }
.form-note{ font-size: 0.85rem; text-align: center; color: var(--success); min-height: 1.2em; }
.form-note.error{ color: var(--danger); }

/* ==========================================================================
   FOOTER
   ========================================================================== */
.footer{ border-top: 1px solid var(--border-soft); padding: 50px 32px; }
.footer-inner{ max-width: var(--page-max); margin: 0 auto; display: flex; flex-direction: column; align-items: center; gap: 16px; text-align: center; }
.footer-tagline{
  font-family: var(--font-mono); font-size: 0.8rem; color: var(--text-secondary);
  letter-spacing: 0.04em; margin-top: -8px;
}
.footer-copy{ color: var(--text-muted); font-size: 0.78rem; margin-top: 10px; }

/* ==========================================================================
   MOUSE GLOW (subtle ambient cursor effect, desktop only)
   ========================================================================== */
.mouse-glow{
  position: fixed; top: 0; left: 0;
  width: 400px; height: 400px;
  background: radial-gradient(circle, var(--accent-glow) 0%, transparent 70%);
  border-radius: 50%;
  pointer-events: none;
  z-index: 1;
  opacity: 0;
  transition: opacity 0.4s ease;
  will-change: transform;
}
@media (max-width: 860px){ .mouse-glow{ display: none; } }

/* ==========================================================================
   BACK TO TOP
   ========================================================================== */
.back-to-top{
  position: fixed; bottom: 28px; right: 28px; z-index: 900;
  width: 46px; height: 46px; border-radius: 50%;
  background: var(--accent-gradient); color: #04101f;
  display: flex; align-items: center; justify-content: center;
  box-shadow: var(--shadow-soft);
  opacity: 0; visibility: hidden; transform: translateY(10px);
  transition: opacity 0.3s var(--ease), transform 0.3s var(--ease), visibility 0.3s var(--ease);
}
.back-to-top.show{ opacity: 1; visibility: visible; transform: translateY(0); }
.back-to-top:hover{ transform: translateY(-4px); }

/* ==========================================================================
   RESPONSIVE
   ========================================================================== */
@media (max-width: 1024px){
  .hero-inner{ grid-template-columns: 1fr; }
  .hero-panel{ order: -1; max-width: 480px; margin: 0 auto; }
  .about-grid{ grid-template-columns: 1fr; }
  .about-media{ max-width: 380px; margin: 0 auto 50px; }
  .skills-grid{ grid-template-columns: repeat(2, 1fr); }
  .projects-grid{ grid-template-columns: 1fr; }
  .contact-grid{ grid-template-columns: 1fr; }
}

@media (max-width: 860px){
  .nav-links{
    position: fixed; top: var(--nav-h); left: 0; right: 0;
    background: var(--bg-elevated); border-bottom: 1px solid var(--border-soft);
    flex-direction: column; padding: 18px 24px; gap: 4px;
    transform: translateY(-130%); opacity: 0;
    transition: transform 0.35s var(--ease), opacity 0.35s var(--ease);
  }
  .nav-links.open{ transform: translateY(0); opacity: 1; }
  .nav-link{ width: 100%; padding: 12px 16px; }
  .nav-burger{ display: flex; }
  .about-list{ grid-template-columns: 1fr; }
}

@media (max-width: 640px){
  .section{ padding: 90px 0; }
  .section-inner{ padding: 0 20px; }
  .hero{ padding: calc(var(--nav-h) + 24px) 20px 70px; }
  .skills-grid{ grid-template-columns: 1fr; }
  .panel-kpis{ grid-template-columns: 1fr 1fr; }
  .hero-buttons{ flex-direction: column; align-items: stretch; }
  .hero-buttons .btn{ justify-content: center; }
  .back-to-top{ right: 18px; bottom: 18px; }
}