/* ===========================
   ROOT VARIABLES
=========================== */
:root {
  --bg-deep:    #0a0f1e;
  --bg-main:    #0f172a;
  --bg-card:    #1e293b;
  --bg-card2:   #162032;
  --bg-hover:   #243447;
  --accent:     #38bdf8;
  --accent2:    #818cf8;
  --success:    #22c55e;
  --warning:    #f59e0b;
  --danger:     #f43f5e;
  --text-main:  #e2e8f0;
  --text-muted: #94a3b8;
  --text-dim:   #64748b;
  --border:     rgba(56,189,248,0.15);
  --glow:       rgba(56,189,248,0.25);
  --radius:     16px;
  --radius-sm:  10px;
}

/* ===========================
   BASE
=========================== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: 'Space Grotesk', sans-serif;
  background: var(--bg-main);
  color: var(--text-main);
  line-height: 1.75;
  overflow-x: hidden;
}

/* Scrollbar */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--bg-deep); }
::-webkit-scrollbar-thumb { background: var(--accent); border-radius: 3px; }

/* ===========================
   BACKGROUND GRID + GLOW
=========================== */
body::before {
  content: '';
  position: fixed; inset: 0; z-index: 0;
  background-image:
    linear-gradient(rgba(56,189,248,0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(56,189,248,0.04) 1px, transparent 1px);
  background-size: 40px 40px;
  pointer-events: none;
}
.bg-orb {
  position: fixed; border-radius: 50%;
  filter: blur(120px); opacity: 0.18; pointer-events: none; z-index: 0;
}
.bg-orb-1 { width: 600px; height: 600px; background: #38bdf8; top: -200px; left: -200px; }
.bg-orb-2 { width: 500px; height: 500px; background: #818cf8; bottom: -200px; right: -200px; }
.bg-orb-3 { width: 300px; height: 300px; background: #22c55e; top: 50%; left: 50%; transform: translate(-50%,-50%); }

/* ===========================
   NAVBAR
=========================== */
.course-nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
  background: rgba(10,15,30,0.85);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
  padding: 14px 0;
}
.course-nav .brand {
  font-family: 'Syne', sans-serif;
  font-weight: 800; font-size: 1.1rem;
  color: var(--accent);
  text-decoration: none;
  display: flex; align-items: center; gap: 10px;
}
.course-nav .brand .brand-icon {
  width: 34px; height: 34px; background: linear-gradient(135deg,#38bdf8,#818cf8);
  border-radius: 8px; display: flex; align-items: center; justify-content: center;
  font-size: 1rem; color: #fff;
}
.chapter-badge {
  background: linear-gradient(135deg,#38bdf8,#818cf8);
  color: #fff; font-size: 0.7rem; font-weight: 700;
  padding: 4px 12px; border-radius: 20px; letter-spacing: 1px;
}

/* ===========================
   HERO
=========================== */
.hero-section {
  min-height: 100vh;
  display: flex; align-items: center;
  padding: 120px 0 80px;
  position: relative; overflow: hidden;
}
.hero-preface-strip {
  background: linear-gradient(135deg, rgba(56,189,248,0.12), rgba(129,140,248,0.12));
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 28px 32px;
  margin-bottom: 56px;
  position: relative;
}
.hero-preface-strip::before {
  content: '';
  position: absolute; left: 0; top: 0; bottom: 0;
  width: 4px; background: linear-gradient(180deg, #38bdf8, #818cf8);
  border-radius: 12px 0 0 12px;
}
.preface-author {
  display: inline-flex; align-items: center; gap: 10px;
  background: rgba(56,189,248,0.1); border: 1px solid var(--border);
  padding: 6px 16px; border-radius: 30px;
  font-size: 0.82rem; color: var(--accent); margin-bottom: 16px;
}
.chapter-number-pill {
  display: inline-flex; align-items: center; gap: 8px;
  background: rgba(56,189,248,0.1); border: 1px solid rgba(56,189,248,0.3);
  color: var(--accent); font-weight: 700; letter-spacing: 2px;
  font-size: 0.75rem; text-transform: uppercase;
  padding: 6px 18px; border-radius: 30px; margin-bottom: 24px;
}
.hero-title {
  font-family: 'Syne', sans-serif;
  font-size: clamp(2.6rem, 6vw, 5rem);
  font-weight: 800; line-height: 1.1;
  margin-bottom: 24px;
}
.hero-title .gradient-text {
  background: linear-gradient(135deg, #38bdf8 0%, #818cf8 50%, #22c55e 100%);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  background-clip: text;
}
.hero-desc {
  font-size: 1.1rem; color: var(--text-muted);
  max-width: 560px; margin-bottom: 40px;
}
.hero-visual {
  position: relative;
}
.hero-code-window {
  background: #0d1b2a;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: 0 40px 80px rgba(0,0,0,0.5), 0 0 60px rgba(56,189,248,0.1);
}
.window-bar {
  background: #1a2535;
  padding: 12px 16px;
  display: flex; align-items: center; gap: 8px;
  border-bottom: 1px solid var(--border);
}
.dot { width: 12px; height: 12px; border-radius: 50%; }
.dot-r { background: #f43f5e; }
.dot-y { background: #f59e0b; }
.dot-g { background: #22c55e; }
.window-title {
  margin-left: 8px; font-size: 0.75rem;
  color: var(--text-dim); font-family: 'Fira Code', monospace;
}
.window-body { padding: 24px; font-family: 'Fira Code', monospace; font-size: 0.85rem; }
.code-line { display: flex; margin-bottom: 8px; }
.ln { color: #2d4a6b; margin-right: 20px; user-select: none; min-width: 20px; text-align: right; }
.kw  { color: #c792ea; }
.fn  { color: #82aaff; }
.str { color: #c3e88d; }
.cm  { color: #546e7a; font-style: italic; }
.op  { color: #89ddff; }
.num { color: #f78c6c; }
.ot  { color: #e2e8f0; }

.floating-badge {
  position: absolute;
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: 12px; padding: 12px 18px;
  display: flex; align-items: center; gap: 10px;
  font-size: 0.82rem; font-weight: 600;
  box-shadow: 0 8px 32px rgba(0,0,0,0.3);
  animation: floatBadge 3s ease-in-out infinite;
}
.floating-badge-1 { top: -20px; right: -20px; animation-delay: 0s; }
.floating-badge-2 { bottom: -20px; left: -20px; animation-delay: 1.5s; }
@keyframes floatBadge {
  0%,100% { transform: translateY(0); }
  50%      { transform: translateY(-8px); }
}

/* ===========================
   OBJECTIVES
=========================== */
.obj-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 16px;
}
.obj-card {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius-sm); padding: 18px 20px;
  display: flex; align-items: flex-start; gap: 14px;
  transition: all 0.3s;
}
.obj-card:hover {
  border-color: var(--accent); transform: translateY(-4px);
  box-shadow: 0 12px 30px rgba(56,189,248,0.1);
}
.obj-icon {
  width: 38px; height: 38px; min-width: 38px;
  background: linear-gradient(135deg, rgba(56,189,248,0.2), rgba(129,140,248,0.2));
  border-radius: 8px; display: flex; align-items: center; justify-content: center;
  color: var(--accent); font-size: 0.9rem;
}

/* ===========================
   SECTION HEADERS
=========================== */
.section-label {
  display: inline-flex; align-items: center; gap: 8px;
  font-size: 0.72rem; font-weight: 700; letter-spacing: 2px;
  text-transform: uppercase; color: var(--accent);
  background: rgba(56,189,248,0.1); border: 1px solid rgba(56,189,248,0.2);
  padding: 5px 14px; border-radius: 20px; margin-bottom: 14px;
}
.section-title {
  font-family: 'Syne', sans-serif;
  font-size: clamp(1.8rem, 4vw, 2.8rem);
  font-weight: 800; line-height: 1.2;
  margin-bottom: 16px;
}
.section-sub {
  color: var(--text-muted); font-size: 1rem; max-width: 600px;
}
.section-divider {
  width: 60px; height: 4px;
  background: linear-gradient(90deg, #38bdf8, #818cf8);
  border-radius: 2px; margin: 20px 0;
}

/* ===========================
   CARDS – general
=========================== */
.glass-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px; transition: all 0.35s;
}
.glass-card:hover {
  border-color: rgba(56,189,248,0.4);
  box-shadow: 0 20px 50px rgba(0,0,0,0.3), 0 0 30px rgba(56,189,248,0.07);
  transform: translateY(-5px);
}

.info-card {
  background: var(--bg-card2); border-radius: var(--radius);
  border: 1px solid var(--border); padding: 24px; height: 100%;
  transition: all 0.3s;
}
.info-card:hover {
  border-color: rgba(56,189,248,0.4);
  box-shadow: 0 10px 30px rgba(0,0,0,0.2);
  transform: translateY(-4px);
}
.info-card .card-icon {
  width: 52px; height: 52px;
  border-radius: 14px; display: flex; align-items: center; justify-content: center;
  font-size: 1.3rem; margin-bottom: 18px;
}

/* ===========================
   NOTE / CALLOUT BOXES
=========================== */
.callout {
  border-radius: var(--radius-sm); padding: 18px 22px;
  display: flex; gap: 14px; align-items: flex-start;
  margin: 20px 0;
}
.callout-icon { font-size: 1.2rem; margin-top: 2px; min-width: 22px; }
.callout-blue  { background: rgba(56,189,248,0.08); border-left: 4px solid #38bdf8; }
.callout-green { background: rgba(34,197,94,0.08);  border-left: 4px solid #22c55e; }
.callout-warn  { background: rgba(245,158,11,0.08); border-left: 4px solid #f59e0b; }
.callout-red   { background: rgba(244,63,94,0.08);  border-left: 4px solid #f43f5e; }
.callout-purple{ background: rgba(129,140,248,0.08);border-left: 4px solid #818cf8; }
.callout .callout-title { font-weight: 700; font-size: 0.88rem; letter-spacing: 0.5px; }
.callout .callout-body  { font-size: 0.9rem; color: var(--text-muted); margin-top: 4px; }

/* ===========================
   KEYWORD HIGHLIGHT
=========================== */
.kw-highlight {
  background: rgba(56,189,248,0.12); color: var(--accent);
  padding: 1px 8px; border-radius: 5px;
  font-family: 'Fira Code', monospace; font-size: 0.88em;
  font-weight: 500;
}
.kw-green  { background: rgba(34,197,94,0.12);  color: #22c55e; }
.kw-warn   { background: rgba(245,158,11,0.12); color: #f59e0b; }
.kw-purple { background: rgba(129,140,248,0.12);color: #818cf8; }

/* ===========================
   CONCEPT CARDS
=========================== */
.concept-card {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius); overflow: hidden;
  transition: all 0.35s;
}
.concept-card:hover {
  border-color: rgba(56,189,248,0.4);
  box-shadow: 0 20px 50px rgba(0,0,0,0.3);
  transform: translateY(-5px);
}
.concept-header {
  padding: 20px 24px; border-bottom: 1px solid var(--border);
  display: flex; align-items: center; gap: 14px;
}
.concept-num {
  width: 36px; height: 36px; border-radius: 10px;
  background: linear-gradient(135deg, #38bdf8, #818cf8);
  display: flex; align-items: center; justify-content: center;
  font-weight: 800; font-size: 0.85rem; color: #fff;
}
.concept-body { padding: 24px; }

/* ===========================
   CODE BLOCKS
=========================== */
.code-block {
  background: #0d1b2a;
  border: 1px solid rgba(56,189,248,0.15);
  border-radius: var(--radius-sm);
  overflow: hidden; margin: 16px 0;
  box-shadow: 0 8px 30px rgba(0,0,0,0.3);
}
.code-topbar {
  background: #1a2535;
  padding: 10px 16px;
  display: flex; align-items: center; justify-content: space-between;
  border-bottom: 1px solid rgba(56,189,248,0.1);
}
.code-lang {
  font-size: 0.72rem; font-weight: 700; letter-spacing: 1px;
  color: var(--accent); text-transform: uppercase;
  display: flex; align-items: center; gap: 8px;
}
.code-dots { display: flex; gap: 6px; }
.code-dot  { width: 10px; height: 10px; border-radius: 50%; }
.copy-btn {
  background: rgba(56,189,248,0.1); border: 1px solid rgba(56,189,248,0.2);
  color: var(--accent); font-size: 0.72rem; font-weight: 600;
  padding: 5px 12px; border-radius: 6px; cursor: pointer;
  transition: all 0.2s; font-family: 'Space Grotesk', sans-serif;
  letter-spacing: 0.5px;
}
.copy-btn:hover { background: rgba(56,189,248,0.2); }
.copy-btn.copied { background: rgba(34,197,94,0.2); border-color: rgba(34,197,94,0.3); color: #22c55e; }
.code-content {
  padding: 20px 20px 20px 0;
  overflow-x: auto;
  font-family: 'Fira Code', monospace; font-size: 0.84rem;
  line-height: 1.8;
}
.code-row {
  display: flex;
  padding: 0 16px; margin: 0;
}
.code-row:hover { background: rgba(56,189,248,0.04); }
.line-no {
  min-width: 36px; color: #2d4a6b;
  text-align: right; padding-right: 20px;
  user-select: none;
}
.code-text { flex: 1; white-space: pre; }

/* Syntax colors */
.s-kw  { color: #c792ea; }
.s-fn  { color: #82aaff; }
.s-str { color: #c3e88d; }
.s-cm  { color: #546e7a; font-style: italic; }
.s-op  { color: #89ddff; }
.s-num { color: #f78c6c; }
.s-mod { color: #ffcb6b; }
.s-ot  { color: #e2e8f0; }

/* ===========================
   OUTPUT BOX
=========================== */
.output-box {
  background: #060e1a; border: 1px solid rgba(34,197,94,0.2);
  border-radius: var(--radius-sm); padding: 16px 20px; margin-top: 14px;
}
.output-label {
  font-size: 0.7rem; font-weight: 700; letter-spacing: 2px;
  color: #22c55e; margin-bottom: 10px;
  display: flex; align-items: center; gap: 6px; text-transform: uppercase;
}
.output-label::before {
  content: ''; width: 8px; height: 8px; background: #22c55e;
  border-radius: 50%; animation: blink 1.5s ease-in-out infinite;
}
@keyframes blink { 0%,100%{opacity:1} 50%{opacity:0.3} }
.output-text {
  font-family: 'Fira Code', monospace; font-size: 0.84rem; color: #22c55e;
  line-height: 1.7;
}

/* ===========================
   EXAMPLE CARDS
=========================== */
.example-card {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius); overflow: hidden; transition: all 0.3s;
}
.example-card:hover {
  border-color: rgba(56,189,248,0.35);
  box-shadow: 0 14px 40px rgba(0,0,0,0.25);
}
.example-header {
  background: linear-gradient(135deg,rgba(56,189,248,0.1),rgba(129,140,248,0.1));
  padding: 18px 24px; border-bottom: 1px solid var(--border);
  display: flex; align-items: center; gap: 12px;
}
.example-num {
  width: 32px; height: 32px;
  background: linear-gradient(135deg,#38bdf8,#818cf8);
  border-radius: 8px; display: flex; align-items: center; justify-content: center;
  font-weight: 800; font-size: 0.8rem; color: #fff;
}
.example-body { padding: 24px; }

/* ===========================
   FEATURE CARDS (Python features)
=========================== */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 16px;
}
.feature-card {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius-sm); padding: 22px;
  transition: all 0.3s; text-align: center;
}
.feature-card:hover {
  border-color: rgba(56,189,248,0.4);
  transform: translateY(-6px);
  box-shadow: 0 20px 40px rgba(0,0,0,0.25);
}
.feature-card .f-icon {
  width: 54px; height: 54px; border-radius: 14px;
  display: flex; align-items: center; justify-content: center;
  font-size: 1.4rem; margin: 0 auto 16px;
}
.feature-card h6 { font-weight: 700; margin-bottom: 8px; }
.feature-card p { font-size: 0.83rem; color: var(--text-muted); margin: 0; }

/* ===========================
   PROCESS FLOW
=========================== */
.flow-container {
  display: flex; align-items: center; flex-wrap: wrap; gap: 12px;
  justify-content: center;
}
.flow-step {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius-sm); padding: 18px 22px;
  text-align: center; min-width: 120px; flex: 1;
  transition: all 0.3s; position: relative;
}
.flow-step:hover {
  border-color: var(--accent);
  transform: translateY(-4px);
  box-shadow: 0 12px 28px rgba(56,189,248,0.12);
}
.flow-step .step-icon {
  width: 44px; height: 44px; border-radius: 12px;
  display: flex; align-items: center; justify-content: center;
  font-size: 1.1rem; margin: 0 auto 10px;
}
.flow-step .step-num {
  position: absolute; top: -10px; left: -10px;
  width: 24px; height: 24px; border-radius: 50%;
  background: linear-gradient(135deg,#38bdf8,#818cf8);
  font-size: 0.7rem; font-weight: 800; color: #fff;
  display: flex; align-items: center; justify-content: center;
}
.flow-arrow {
  color: var(--accent); font-size: 1.4rem;
  animation: arrowPulse 1.5s ease-in-out infinite;
}
@keyframes arrowPulse { 0%,100%{opacity:1;transform:translateX(0)} 50%{opacity:0.5;transform:translateX(4px)} }

/* ===========================
   REPL / TERMINAL
=========================== */
.terminal-box {
  background: #050f1a; border: 1px solid rgba(34,197,94,0.2);
  border-radius: var(--radius-sm); overflow: hidden;
}
.terminal-bar {
  background: #0a1628; padding: 10px 16px;
  display: flex; align-items: center; gap: 8px;
  border-bottom: 1px solid rgba(34,197,94,0.1);
}
.terminal-title { font-size: 0.72rem; color: var(--text-dim); font-family: 'Fira Code', monospace; margin-left: 8px; }
.terminal-body { padding: 20px; font-family: 'Fira Code', monospace; font-size: 0.84rem; line-height: 2; }
.t-prompt { color: #22c55e; }
.t-cmd    { color: #e2e8f0; }
.t-output { color: #94a3b8; }

/* ===========================
   COMPARISON TABLE
=========================== */
.compare-table {
  width: 100%; border-collapse: collapse;
}
.compare-table th, .compare-table td {
  padding: 14px 18px;
  border-bottom: 1px solid var(--border);
  text-align: left; font-size: 0.9rem;
}
.compare-table th {
  background: rgba(56,189,248,0.08);
  color: var(--accent); font-weight: 700; font-size: 0.8rem;
  letter-spacing: 1px; text-transform: uppercase;
}
.compare-table tbody tr { transition: background 0.2s; }
.compare-table tbody tr:hover { background: rgba(56,189,248,0.04); }
.compare-table td:first-child { font-family: 'Fira Code', monospace; color: var(--accent); }
.compare-table .badge-built { background: rgba(34,197,94,0.15); color: #22c55e; padding:3px 10px; border-radius:20px; font-size:0.72rem; font-weight:700; }
.compare-table .badge-ext   { background: rgba(245,158,11,0.15); color: #f59e0b; padding:3px 10px; border-radius:20px; font-size:0.72rem; font-weight:700; }

/* ===========================
   MISTAKE CARDS
=========================== */
.mistake-card {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius); overflow: hidden;
}
.mistake-header {
  padding: 16px 22px; font-weight: 700; font-size: 0.9rem;
  display: flex; align-items: center; gap: 10px;
}
.mistake-wrong .mistake-header { background: rgba(244,63,94,0.12); color: #f43f5e; border-bottom: 1px solid rgba(244,63,94,0.2); }
.mistake-right .mistake-header { background: rgba(34,197,94,0.12); color: #22c55e; border-bottom: 1px solid rgba(34,197,94,0.2); }
.mistake-body { padding: 20px; }

/* ===========================
   ACCORDION (Interview Q)
=========================== */
.qa-accordion .accordion-item {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius-sm) !important;
  margin-bottom: 12px; overflow: hidden;
}
.qa-accordion .accordion-button {
  background: var(--bg-card); color: var(--text-main);
  font-weight: 600; font-size: 0.93rem; padding: 18px 22px;
  box-shadow: none;
}
.qa-accordion .accordion-button:not(.collapsed) {
  background: rgba(56,189,248,0.08); color: var(--accent);
}
.qa-accordion .accordion-button::after {
  filter: invert(1) brightness(0.6);
}
.qa-accordion .accordion-button:not(.collapsed)::after {
  filter: none; color: var(--accent);
}
.qa-accordion .accordion-body {
  background: var(--bg-card2); color: var(--text-muted);
  font-size: 0.9rem; padding: 18px 22px;
  border-top: 1px solid var(--border);
}
.q-num {
  background: linear-gradient(135deg,#38bdf8,#818cf8);
  color: #fff; width: 26px; height: 26px; border-radius: 6px;
  display: inline-flex; align-items: center; justify-content: center;
  font-size: 0.72rem; font-weight: 800; margin-right: 12px; flex-shrink: 0;
}

/* ===========================
   PRACTICE CARDS
=========================== */
.practice-card {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius); overflow: hidden;
  transition: all 0.3s; height: 100%;
}
.practice-card:hover {
  transform: translateY(-6px);
  box-shadow: 0 20px 50px rgba(0,0,0,0.3);
}
.practice-header {
  padding: 18px 22px; display: flex; align-items: center; justify-content: space-between;
  border-bottom: 1px solid var(--border);
}
.diff-badge {
  font-size: 0.68rem; font-weight: 800; padding: 4px 12px;
  border-radius: 20px; letter-spacing: 1px; text-transform: uppercase;
}
.diff-easy   { background: rgba(34,197,94,0.15);  color: #22c55e;  border:1px solid rgba(34,197,94,0.3); }
.diff-medium { background: rgba(245,158,11,0.15); color: #f59e0b;  border:1px solid rgba(245,158,11,0.3); }
.diff-hard   { background: rgba(244,63,94,0.15);  color: #f43f5e;  border:1px solid rgba(244,63,94,0.3); }
.practice-body { padding: 22px; }
.practice-body h6 { font-weight: 700; margin-bottom: 12px; }
.practice-body p  { font-size: 0.88rem; color: var(--text-muted); margin: 0; }
.practice-hint {
  margin-top: 14px; padding: 12px 16px;
  background: rgba(56,189,248,0.06); border-radius: 8px;
  border-left: 3px solid var(--accent);
  font-size: 0.82rem; color: var(--text-muted);
}

/* ===========================
   REVISION SECTION
=========================== */
.revision-item {
  display: flex; align-items: flex-start; gap: 14px;
  padding: 16px 20px;
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius-sm); margin-bottom: 12px;
  transition: all 0.3s;
}
.revision-item:hover {
  border-color: rgba(56,189,248,0.35);
  transform: translateX(6px);
  background: var(--bg-hover);
}
.revision-check {
  width: 28px; height: 28px; min-width: 28px;
  background: rgba(34,197,94,0.15); border-radius: 8px;
  display: flex; align-items: center; justify-content: center;
  color: #22c55e; font-size: 0.85rem;
}

/* ===========================
   PROGRESS TRACKER
=========================== */
.progress-section {
  background: linear-gradient(135deg, rgba(56,189,248,0.08), rgba(129,140,248,0.08));
  border: 1px solid var(--border); border-radius: var(--radius);
  padding: 36px; position: relative; overflow: hidden;
}
.progress-section::before {
  content: '';
  position: absolute; top: -50%; right: -100px;
  width: 400px; height: 400px;
  background: radial-gradient(circle, rgba(56,189,248,0.15), transparent 70%);
  pointer-events: none;
}
.progress-steps {
  display: flex; gap: 0; position: relative; margin: 30px 0;
  overflow: hidden;
}
.progress-steps::before {
  content: '';
  position: absolute; top: 20px; left: 0; right: 0; height: 3px;
  background: var(--bg-hover); z-index: 0;
}
.progress-step {
  flex: 1; text-align: center; position: relative; z-index: 1;
}
.ps-circle {
  width: 42px; height: 42px; border-radius: 50%; margin: 0 auto 10px;
  display: flex; align-items: center; justify-content: center;
  font-size: 0.85rem; font-weight: 700; border: 3px solid;
  position: relative; background: var(--bg-main);
}
.ps-done    { border-color: #22c55e; color: #22c55e; background: rgba(34,197,94,0.1); }
.ps-active  { border-color: #38bdf8; color: #38bdf8; background: rgba(56,189,248,0.1);
               box-shadow: 0 0 20px rgba(56,189,248,0.4); animation: pulse 2s infinite; }
.ps-pending { border-color: var(--text-dim); color: var(--text-dim); }
@keyframes pulse { 0%,100%{box-shadow:0 0 15px rgba(56,189,248,0.3)} 50%{box-shadow:0 0 30px rgba(56,189,248,0.6)} }
.ps-label { font-size: 0.72rem; color: var(--text-muted); font-weight: 600; }

.big-progress { height: 12px; background: var(--bg-hover); border-radius: 6px; overflow: hidden; }
.big-progress-bar {
  height: 100%; width: 8.33%; /* ch1/12 */
  background: linear-gradient(90deg, #38bdf8, #818cf8);
  border-radius: 6px; position: relative;
  animation: growBar 1.5s ease-out forwards;
  transform-origin: left;
}
@keyframes growBar { from{width:0} to{width:8.33%} }
.big-progress-bar::after {
  content: '';
  position: absolute; right: 0; top: 0; bottom: 0; width: 20px;
  background: rgba(255,255,255,0.3);
  animation: shimmer 2s infinite;
}
@keyframes shimmer { 0%{opacity:0} 50%{opacity:1} 100%{opacity:0} }

/* ===========================
   CHECKLIST
=========================== */
.checklist-grid {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(280px,1fr));
  gap: 12px;
}
.check-item {
  display: flex; align-items: center; gap: 12px;
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius-sm); padding: 14px 18px;
  transition: all 0.3s; cursor: pointer;
}
.check-item:hover { border-color: rgba(34,197,94,0.4); background: rgba(34,197,94,0.04); }
.check-item input[type=checkbox] { display: none; }
.check-box {
  width: 22px; height: 22px; border-radius: 6px;
  border: 2px solid var(--text-dim); display: flex; align-items: center;
  justify-content: center; transition: all 0.3s; flex-shrink: 0;
  font-size: 0.75rem; color: transparent;
}
.check-item.checked .check-box {
  background: #22c55e; border-color: #22c55e; color: #fff;
}
.check-item.checked .check-label { text-decoration: line-through; color: var(--text-dim); }
.check-label { font-size: 0.88rem; font-weight: 500; }

/* ===========================
   SVG ILLUSTRATIONS (inline)
=========================== */
.illustration-wrap {
  display: flex; justify-content: center; align-items: center;
  padding: 20px 0;
}

/* ===========================
   ROADMAP
=========================== */
.roadmap {
  position: relative; padding-left: 32px;
}
.roadmap::before {
  content: '';
  position: absolute; left: 12px; top: 0; bottom: 0;
  width: 2px; background: linear-gradient(180deg, #38bdf8, #818cf8, #22c55e);
}
.roadmap-item {
  position: relative; margin-bottom: 28px;
}
.roadmap-dot {
  position: absolute; left: -26px; top: 4px;
  width: 16px; height: 16px; border-radius: 50%;
  background: linear-gradient(135deg, #38bdf8, #818cf8);
  box-shadow: 0 0 12px rgba(56,189,248,0.4);
}
.roadmap-content {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius-sm); padding: 18px 22px;
  transition: all 0.3s;
}
.roadmap-content:hover {
  border-color: rgba(56,189,248,0.35);
  transform: translateX(6px);
}

/* ===========================
   USE CASE CARDS
=========================== */
.usecase-card {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 26px; text-align: center;
  transition: all 0.35s; height: 100%;
}
.usecase-card:hover {
  border-color: rgba(56,189,248,0.4);
  transform: translateY(-8px);
  box-shadow: 0 25px 50px rgba(0,0,0,0.3), 0 0 30px rgba(56,189,248,0.08);
}
.uc-icon {
  width: 64px; height: 64px; border-radius: 18px;
  display: flex; align-items: center; justify-content: center;
  font-size: 1.6rem; margin: 0 auto 18px;
}

/* ===========================
   FOOTER
=========================== */
.site-footer {
  background: var(--bg-deep);
  border-top: 1px solid var(--border);
  padding: 50px 0 30px;
}

/* ===========================
   BACK TO TOP
=========================== */
#backToTop {
  position: fixed; bottom: 28px; right: 28px; z-index: 999;
  width: 48px; height: 48px; border-radius: 12px;
  background: linear-gradient(135deg, #38bdf8, #818cf8);
  border: none; color: #fff; font-size: 1.1rem;
  cursor: pointer; opacity: 0; transform: translateY(20px);
  transition: all 0.3s; box-shadow: 0 8px 24px rgba(56,189,248,0.35);
}
#backToTop.visible { opacity: 1; transform: translateY(0); }
#backToTop:hover { transform: translateY(-4px); box-shadow: 0 12px 32px rgba(56,189,248,0.5); }

/* ===========================
   SPACING UTILITIES
=========================== */
.section-gap { padding: 80px 0; }
.section-gap-sm { padding: 50px 0; }
.mb-section { margin-bottom: 56px; }

/* ===========================
   RESPONSIVE
=========================== */
@media(max-width:768px){
  .hero-title { font-size: 2.2rem; }
  .flow-container { flex-direction: column; }
  .flow-arrow { transform: rotate(90deg); }
  .floating-badge-1, .floating-badge-2 { display: none; }
  .progress-steps { gap: 0; }
  .ps-label { font-size: 0.62rem; }
}

/* ===========================
   ANIMATIONS
=========================== */
@keyframes fadeInUp { from{opacity:0;transform:translateY(30px)} to{opacity:1;transform:translateY(0)} }
.animate-hero { animation: fadeInUp 0.8s ease-out forwards; }
.animate-hero-delay-1 { animation: fadeInUp 0.8s 0.2s ease-out both; }
.animate-hero-delay-2 { animation: fadeInUp 0.8s 0.4s ease-out both; }
.animate-hero-delay-3 { animation: fadeInUp 0.8s 0.6s ease-out both; }

.typing-cursor::after {
  content: '|'; color: var(--accent); animation: blink 0.8s step-end infinite;
}

/* ===========================
   FULL FOOTER (updated)
=========================== */
.footer-grid {
  display: grid; grid-template-columns: 2fr 1fr 1fr; gap: 40px;
  margin-bottom: 40px;
}
.footer-brand-name {
  font-family: 'Syne', sans-serif; font-size: 1.4rem; font-weight: 800;
  background: linear-gradient(135deg, #38bdf8, #818cf8);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  background-clip: text; margin-bottom: 12px;
}
.footer-tagline { font-size: 0.88rem; color: var(--text-muted); margin-bottom: 20px; }
.footer-social { display: flex; gap: 10px; }
.footer-social-link {
  width: 36px; height: 36px; border-radius: 8px;
  background: var(--bg-card); border: 1px solid var(--border);
  display: flex; align-items: center; justify-content: center;
  color: var(--text-muted); font-size: 0.9rem; text-decoration: none;
  transition: all 0.25s;
}
.footer-social-link:hover { border-color: var(--accent); color: var(--accent); }
.footer-col-title { font-weight: 700; font-size: 0.85rem; margin-bottom: 16px; color: var(--text-main); }
.footer-link {
  display: block; color: var(--text-muted); font-size: 0.85rem;
  text-decoration: none; margin-bottom: 10px; transition: color 0.2s;
}
.footer-link:hover { color: var(--accent); }
.footer-bottom {
  border-top: 1px solid var(--border); padding-top: 24px;
  display: flex; align-items: center; justify-content: space-between;
  flex-wrap: wrap; gap: 12px;
}
.footer-copy { font-size: 0.8rem; color: var(--text-dim); }
.footer-love { font-size: 0.85rem; color: var(--text-muted); }
.footer-love a { color: var(--accent); text-decoration: none; }
.footer-love a:hover { color: #818cf8; }
@media(max-width:992px){ .footer-grid { grid-template-columns: 1fr 1fr; } }
@media(max-width:576px){ .footer-grid { grid-template-columns: 1fr; gap: 28px; } }