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

:root {
  --black: #0a0a0a;
  --near-black: #111111;
  --dark: #1a1a1a;
  --mid-dark: #2a2a2a;
  --mid: #555555;
  --mid-light: #888888;
  --light: #c8c8c8;
  --near-white: #e8e8e8;
  --white: #f5f5f5;
  --pure-white: #ffffff;
  --accent-dim: rgba(255, 255, 255, 0.08);
  --accent-glow: rgba(255, 255, 255, 0.05);
  --success: #4ade80;
  --error: #f87171;
  --sidebar-w: 260px;
  --font-display: "Syne", sans-serif;
  --font-mono: "DM Mono", monospace;
  --font-serif: "Instrument Serif", serif;
  --ease-out-expo: cubic-bezier(0.16, 1, 0.3, 1);
  --transition: 0.4s var(--ease-out-expo);
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 20px;
}

html { scroll-behavior: smooth; }
body {
  background-color: var(--black);
  color: var(--near-white);
  font-family: var(--font-display);
  overflow-x: hidden;
}
::selection { background: var(--white); color: var(--black); }
a { color: inherit; text-decoration: none; }
button { border: none; background: none; cursor: pointer; }
::-webkit-scrollbar { width: 4px; }
::-webkit-scrollbar-track { background: var(--near-black); }
::-webkit-scrollbar-thumb { background: var(--mid); border-radius: 2px; }

/* custom cursor */
.cursor, .cursor-follower {
  position: fixed;
  pointer-events: none;
  z-index: 9999;
  transform: translate(-50%, -50%);
  border-radius: 50%;
}
.cursor { width: 8px; height: 8px; background: var(--pure-white); mix-blend-mode: difference; }
.cursor-follower { width: 36px; height: 36px; border: 1px solid rgba(255,255,255,0.35); z-index: 9998; }
.cursor.hover, .cursor-follower.hover { transform: scale(1.5); opacity: 0.6; }

.progress-bar {
  position: fixed;
  top: 0;
  left: 0;
  height: 2px;
  width: 0%;
  background: var(--pure-white);
  z-index: 1000;
  transition: width 0.1s linear;
}

/* sidebar */
.sidebar {
  position: fixed;
  top: 0;
  left: 0;
  width: var(--sidebar-w);
  height: 100vh;
  background: var(--near-black);
  border-right: 1px solid rgba(255,255,255,0.06);
  display: flex;
  flex-direction: column;
  padding: 40px 32px;
  z-index: 100;
  transition: transform var(--transition);
}
.sidebar-logo { display: flex; align-items: baseline; gap: 8px; margin-bottom: 52px; }
.logo-mark { font-size: 24px; font-weight: 800; letter-spacing: -0.02em; color: var(--pure-white); }
.logo-year { font-family: var(--font-mono); font-size: 11px; color: var(--mid); }
.sidebar-nav ul { list-style: none; }
.sidebar-nav li { margin-bottom: 4px; }
.nav-link {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 12px;
  border-radius: var(--radius-sm);
  font-size: 13px;
  font-weight: 500;
  color: var(--mid-light);
  transition: all 0.25s;
  position: relative;
}
.nav-link::before { content: attr(data-label); font-family: var(--font-mono); font-size: 10px; color: var(--mid-dark); min-width: 20px; }
.nav-link:hover, .nav-link.active { color: var(--pure-white); background: var(--accent-dim); }
.nav-link.active::after {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 2px;
  height: 60%;
  background: var(--pure-white);
  border-radius: 2px;
}
.sidebar-footer { margin-top: auto; font-family: var(--font-mono); font-size: 10px; color: var(--mid-dark); text-transform: uppercase; }

/* hamburger */
.hamburger {
  display: none;
  position: fixed;
  top: 20px;
  right: 20px;
  z-index: 200;
  flex-direction: column;
  gap: 5px;
  padding: 12px;
  border-radius: var(--radius-sm);
  background: var(--near-black);
  border: 1px solid rgba(255,255,255,0.08);
}
.hamburger span { display: block; width: 22px; height: 1.5px; background: var(--near-white); transition: all 0.3s; }
.hamburger.open span:nth-child(1) { transform: rotate(45deg) translate(4.5px, 4.5px); }
.hamburger.open span:nth-child(2) { opacity: 0; }
.hamburger.open span:nth-child(3) { transform: rotate(-45deg) translate(4.5px, -4.5px); }

.main-content { margin-left: var(--sidebar-w); min-height: 100vh; }

/* sections */
.section { padding: 100px 80px; border-bottom: 1px solid rgba(255,255,255,0.05); position: relative; }
.alt-section { background: var(--near-black); }

/* HERO WITH RIGHT SIDE BENTO */
.hero-section {
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding: 100px 80px;
}
.hero-layout {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 60px;
  width: 100%;
  position: relative;
  z-index: 1;
}
.hero-left {
  flex: 1.2;
  max-width: 700px;
}
.hero-right {
  flex: 0.9;
  min-width: 320px;
}
.hero-grid-backdrop {
  position: absolute;
  inset: 0;
  display: grid;
  grid-template-columns: repeat(6,1fr);
  pointer-events: none;
  opacity: 0.03;
}
.grid-line { border-right: 1px solid var(--pure-white); animation: grid-pulse 4s ease-in-out infinite; animation-delay: calc(var(--i) * 0.4s); }
@keyframes grid-pulse { 0%,100%{opacity:0.5} 50%{opacity:1} }
.hero-tag { font-family: var(--font-mono); font-size: 11px; letter-spacing: 0.14em; color: var(--mid); text-transform: uppercase; margin-bottom: 28px; }
.hero-title { font-size: clamp(48px,6vw,86px); font-weight: 800; line-height: 0.92; letter-spacing: -0.04em; color: var(--pure-white); margin-bottom: 40px; }
.title-line { display: block; overflow: hidden; }
.italic { font-family: var(--font-serif); font-style: italic; }
.hero-divider { width: 48px; height: 1px; background: var(--mid); margin-bottom: 28px; }
.hero-desc { font-size: 17px; line-height: 1.75; color: var(--mid-light); max-width: 560px; margin-bottom: 32px; }
.hero-meta { display: flex; gap: 10px; flex-wrap: wrap; margin-bottom: 40px; }
.meta-pill { font-family: var(--font-mono); font-size: 11px; padding: 6px 14px; border: 1px solid rgba(255,255,255,0.15); border-radius: 100px; color: var(--mid-light); }
.hero-scroll-hint { font-family: var(--font-mono); font-size: 12px; color: var(--mid-dark); animation: bounce 2.4s ease-in-out infinite; }
@keyframes bounce { 0%,100%{transform:translateY(0)} 50%{transform:translateY(6px)} }

/* Bento stats - redesigned for right side */
.bento-stats {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
}
.bento-card {
  background: var(--near-black);
  border: 1px solid rgba(255,255,255,0.07);
  border-radius: var(--radius-md);
  padding: 24px 20px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  transition: all var(--transition);
}
.bento-card:hover { transform: translateY(-4px); border-color: rgba(255,255,255,0.2); }
.bento-large { grid-column: span 2; background: linear-gradient(135deg, var(--dark) 0%, var(--near-black) 100%); }
.bento-accent { background: rgba(255,255,255,0.03); border-left: 2px solid var(--pure-white); }
.bento-num { font-size: clamp(28px,3.5vw,42px); font-weight: 800; color: var(--pure-white); letter-spacing: -0.02em; }
.bento-label { font-family: var(--font-mono); font-size: 11px; color: var(--mid-light); line-height: 1.4; }

.section-header { margin-bottom: 48px; display: flex; flex-direction: column; gap: 8px; }
.section-index { font-family: var(--font-mono); font-size: 12px; color: var(--mid-dark); }
.section-title { font-size: clamp(32px,4vw,52px); font-weight: 800; letter-spacing: -0.03em; color: var(--pure-white); }
.section-sub { font-family: var(--font-serif); font-style: italic; font-size: 18px; color: var(--mid); }
.section-body { max-width: 900px; }
.lead { font-size: 18px; line-height: 1.8; color: var(--light); border-left: 2px solid rgba(255,255,255,0.12); padding-left: 24px; margin-bottom: 48px; }

.cards-grid { display: grid; grid-template-columns: repeat(3,1fr); gap: 16px; margin-bottom: 40px; }
.tech-card { background: var(--dark); border: 1px solid rgba(255,255,255,0.07); border-radius: var(--radius-md); padding: 28px 24px; transition: all var(--transition); }
.tech-card:hover { transform: translateY(-6px); border-color: rgba(255,255,255,0.18); }
.card-icon { font-size: 26px; margin-bottom: 14px; }
.tech-card h3 { font-size: 17px; font-weight: 700; margin-bottom: 10px; }
.tech-card p { font-size: 13.5px; line-height: 1.7; color: var(--mid-light); margin-bottom: 16px; }
.card-tag { font-family: var(--font-mono); font-size: 11px; color: var(--mid-dark); border-top: 1px solid rgba(255,255,255,0.05); padding-top: 12px; }

.accordion { border: 1px solid rgba(255,255,255,0.08); border-radius: var(--radius-md); overflow: hidden; }
.accordion-btn { width: 100%; display: flex; justify-content: space-between; padding: 20px 24px; color: var(--near-white); font-size: 15px; font-weight: 600; text-align: left; }
.accordion-btn:hover { background: rgba(255,255,255,0.03); }
.acc-icon { font-size: 20px; color: var(--mid); transition: transform 0.35s; }
.accordion.open .acc-icon { transform: rotate(45deg); }
.accordion-body { max-height: 0; overflow: hidden; transition: max-height 0.5s ease-out; padding: 0 24px; }
.accordion.open .accordion-body { max-height: 400px; padding: 20px 24px 24px; }
.accordion-body p { font-size: 14.5px; line-height: 1.8; color: var(--mid-light); margin-bottom: 12px; }

.stat-bar { display: flex; border: 1px solid rgba(255,255,255,0.07); border-radius: var(--radius-md); margin-bottom: 40px; }
.stat-item { flex: 1; padding: 20px; border-right: 1px solid rgba(255,255,255,0.07); }
.stat-item:last-child { border-right: none; }
.stat-num { font-size: 20px; font-weight: 800; color: var(--pure-white); }
.stat-desc { font-family: var(--font-mono); font-size: 11px; color: var(--mid-dark); }

.cloud-bento { display: grid; grid-template-columns: repeat(2,1fr); gap: 12px; margin-bottom: 40px; }
.cloud-tier { padding: 24px; border: 1px solid rgba(255,255,255,0.08); border-radius: var(--radius-md); position: relative; }
.cloud-tier::after { content: ""; position: absolute; top: 0; left: 0; width: 3px; height: 100%; }
.tier-saas::after { background: var(--near-white); }
.tier-paas::after { background: var(--light); }
.tier-iaas::after { background: var(--mid-light); }
.tier-faas::after { background: var(--mid); }
.tier-label { font-size: 22px; font-weight: 800; color: var(--pure-white); }
.tier-desc { font-size: 13.5px; color: var(--mid-light); margin-top: 10px; }

.timeline { padding-left: 32px; margin-bottom: 40px; position: relative; }
.timeline::before { content: ""; position: absolute; left: 7px; top: 8px; bottom: 8px; width: 1px; background: rgba(255,255,255,0.08); }
.timeline-item { position: relative; margin-bottom: 32px; }
.tl-dot { position: absolute; left: -28px; top: 6px; width: 8px; height: 8px; border-radius: 50%; background: var(--mid-dark); }
.tl-content h4 { font-size: 16px; font-weight: 700; margin-bottom: 8px; }
.tl-content p { font-size: 14px; color: var(--mid-light); }

.table-wrapper { border: 1px solid rgba(255,255,255,0.07); border-radius: var(--radius-md); overflow-x: auto; margin-bottom: 40px; }
.tech-table { width: 100%; border-collapse: collapse; }
.tech-table th, .tech-table td { padding: 14px 18px; text-align: left; font-size: 13.5px; }
.tech-table th { font-family: var(--font-mono); font-size: 11px; color: var(--mid); background: rgba(255,255,255,0.04); }
.tech-table td { color: var(--mid-light); border-bottom: 1px solid rgba(255,255,255,0.04); }

.alert-block { display: grid; grid-template-columns: repeat(3,1fr); gap: 12px; margin-bottom: 40px; }
.alert-item { border: 1px solid rgba(255,255,255,0.08); border-radius: var(--radius-md); padding: 24px; }
.alert-num { font-size: 28px; font-weight: 800; color: var(--near-white); display: block; margin-bottom: 10px; }
.alert-item span:last-child { font-size: 13px; color: var(--mid-light); }

.vs-grid { display: flex; border: 1px solid rgba(255,255,255,0.07); border-radius: var(--radius-md); margin-bottom: 40px; }
.vs-item { flex: 1; text-align: center; padding: 28px 16px; border-right: 1px solid rgba(255,255,255,0.06); }
.vs-item:last-child { border-right: none; }
.vs-letter { font-size: 40px; font-weight: 800; color: var(--mid-dark); }
.vs-word { font-size: 13px; font-weight: 700; margin: 8px 0; }
.vs-desc { font-size: 11.5px; color: var(--mid-dark); }

/* QUIZ STYLES */
.quiz-section { background: linear-gradient(135deg, var(--near-black) 0%, var(--black) 100%); }
.quiz-container { max-width: 700px; margin: 0 auto; }
.quiz-card { background: var(--dark); border: 1px solid rgba(255,255,255,0.1); border-radius: var(--radius-lg); padding: 32px; box-shadow: 0 20px 40px rgba(0,0,0,0.4); }
.quiz-header { display: flex; justify-content: space-between; margin-bottom: 28px; padding-bottom: 16px; border-bottom: 1px solid rgba(255,255,255,0.1); }
.quiz-counter, .quiz-score { font-family: var(--font-mono); font-size: 12px; color: var(--mid-light); }
.quiz-question { font-size: 22px; font-weight: 600; line-height: 1.4; margin-bottom: 28px; color: var(--pure-white); }
.quiz-options { display: flex; flex-direction: column; gap: 12px; margin-bottom: 28px; }
.quiz-option { background: var(--near-black); border: 1px solid rgba(255,255,255,0.08); border-radius: var(--radius-md); padding: 14px 20px; font-size: 15px; color: var(--near-white); text-align: left; transition: all 0.2s; cursor: pointer; }
.quiz-option:hover { background: var(--mid-dark); border-color: rgba(255,255,255,0.2); transform: translateX(4px); }
.quiz-option.selected { background: rgba(255,255,255,0.12); border-color: var(--pure-white); }
.quiz-option.correct { background: rgba(74,222,128,0.2); border-color: var(--success); color: var(--success); }
.quiz-option.wrong { background: rgba(248,113,113,0.2); border-color: var(--error); color: var(--error); text-decoration: line-through; }
.quiz-feedback { min-height: 60px; font-size: 14px; padding: 12px; border-radius: var(--radius-sm); margin-bottom: 24px; }
.quiz-feedback.correct-feedback { background: rgba(74,222,128,0.1); color: var(--success); border-left: 3px solid var(--success); }
.quiz-feedback.wrong-feedback { background: rgba(248,113,113,0.1); color: var(--error); border-left: 3px solid var(--error); }
.quiz-nav { display: flex; justify-content: space-between; gap: 16px; }
.quiz-btn { padding: 12px 28px; border-radius: 100px; font-family: var(--font-mono); font-size: 13px; font-weight: 500; transition: all 0.2s; border: 1px solid rgba(255,255,255,0.15); background: var(--near-black); color: var(--near-white); }
.quiz-btn:hover { background: var(--mid-dark); border-color: rgba(255,255,255,0.3); transform: translateY(-2px); }
.quiz-btn:disabled { opacity: 0.4; cursor: not-allowed; transform: none; }
.next-btn { background: var(--pure-white); color: var(--black); border-color: transparent; }
.next-btn:hover { background: var(--light); transform: translateY(-2px); }
.restart-btn { background: var(--pure-white); color: var(--black); padding: 12px 32px; }

.quiz-results { text-align: center; }
.results-card { background: var(--dark); border: 1px solid rgba(255,255,255,0.1); border-radius: var(--radius-lg); padding: 48px 32px; }
.results-icon { font-size: 64px; margin-bottom: 20px; }
.results-title { font-size: 32px; font-weight: 800; margin-bottom: 16px; }
.results-score { font-size: 24px; font-weight: 600; margin-bottom: 20px; color: var(--pure-white); }
.results-message { font-size: 16px; color: var(--mid-light); margin-bottom: 32px; line-height: 1.6; }

.site-footer { background: var(--near-black); border-top: 1px solid rgba(255,255,255,0.06); padding: 60px 80px 40px; }
.footer-inner { display: flex; justify-content: space-between; margin-bottom: 40px; padding-bottom: 40px; border-bottom: 1px solid rgba(255,255,255,0.05); }
.footer-logo { font-size: 28px; font-weight: 800; color: var(--pure-white); display: block; margin-bottom: 10px; }
.footer-left p { font-size: 14px; color: var(--mid); max-width: 300px; }
.footer-note { font-family: var(--font-mono); font-size: 12px; color: var(--mid-dark); }
.footer-bottom { display: flex; justify-content: space-between; font-family: var(--font-mono); font-size: 11px; color: var(--mid-dark); }
.back-to-top { font-family: var(--font-mono); font-size: 11px; color: var(--mid-light); padding: 8px 16px; border: 1px solid rgba(255,255,255,0.1); border-radius: 100px; cursor: pointer; }

.reveal { opacity: 0; transform: translateY(32px); transition: opacity 0.7s var(--ease-out-expo), transform 0.7s var(--ease-out-expo); }
.reveal.visible { opacity: 1; transform: translateY(0); }
.reveal-delay-1 { transition-delay: 0.15s; }
.reveal-delay-2 { transition-delay: 0.3s; }
.reveal-delay-3 { transition-delay: 0.45s; }
.reveal-delay-4 { transition-delay: 0.6s; }
.reveal-delay-5 { transition-delay: 0.75s; }
.stagger-1 { transition-delay: 0.05s; }
.stagger-2 { transition-delay: 0.15s; }
.stagger-3 { transition-delay: 0.25s; }

@media (max-width: 1200px) { 
  .cards-grid { grid-template-columns: repeat(2,1fr); }
  .hero-layout { flex-direction: column; gap: 40px; }
  .hero-left { max-width: 100%; }
  .hero-right { width: 100%; min-width: auto; }
  .bento-stats { max-width: 500px; margin: 0 auto; }
}
@media (max-width: 900px) {
  .sidebar { transform: translateX(-100%); width: 260px; box-shadow: 4px 0 40px rgba(0,0,0,0.6); }
  .sidebar.open { transform: translateX(0); }
  .hamburger { display: flex; }
  .main-content { margin-left: 0; }
  .section { padding: 60px 24px; }
  .hero-section { padding: 80px 24px 60px; }
  .site-footer { padding: 40px 24px 32px; }
  .cards-grid { grid-template-columns: 1fr; }
  .alert-block { grid-template-columns: 1fr; }
  .cloud-bento { grid-template-columns: 1fr; }
  .vs-grid { flex-direction: column; }
  .vs-item { border-right: none; border-bottom: 1px solid rgba(255,255,255,0.06); }
  .stat-bar { flex-direction: column; }
  .stat-item { border-right: none; border-bottom: 1px solid rgba(255,255,255,0.06); }
  .footer-inner { flex-direction: column; gap: 24px; }
  .footer-bottom { flex-direction: column; gap: 12px; text-align: center; }
  .cursor, .cursor-follower { display: none; }
  body { cursor: auto; }
  .quiz-card { padding: 24px; }
  .quiz-question { font-size: 18px; }
  .bento-stats { grid-template-columns: 1fr; }
  .bento-large { grid-column: span 1; }
}
@media (max-width: 600px) { 
  .hero-title { font-size: 40px; }
  .section-title { font-size: 28px; }
}