body { padding-top: 70px; }

.hero {
  position: relative;
  min-height: 92vh;
  display: flex;
  align-items: center;
  overflow: hidden;
}
.hero-bg { position: absolute; inset: 0; z-index: 0; }

.hero-inner {
  position: relative;
  z-index: 1;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: clamp(1.5rem, 4vw, 4rem);
}
.hero-content { position: relative; flex: 1 1 480px; max-width: 700px; min-width: 0; }

.hero-pretitle {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  letter-spacing: 0.1em;
  color: var(--clr-accent);
  text-transform: uppercase;
  margin-bottom: 1.5rem;
  animation: fadeSlideIn 0.6s var(--ease-out) both;
}
.hero-pretitle::before {
  content: '';
  width: 30px;
  height: 2px;
  background: var(--clr-accent);
  border-radius: 2px;
}
.hero-title {
  font-size: clamp(2.4rem, 5.5vw, 4.5rem);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -0.025em;
  color: var(--clr-text);
  margin-bottom: 1.5rem;
  animation: fadeSlideIn 0.6s var(--ease-out) 0.1s both;
}
.hero-title .word-accent { color: var(--clr-accent); position: relative; }
.hero-title .word-accent::after {
  content: '';
  position: absolute;
  bottom: 4px; left: 0; right: 0;
  height: 3px;
  background: var(--clr-accent);
  border-radius: 2px;
  opacity: 0.55;
}
.hero-subtitle {
  font-size: clamp(1rem, 2vw, 1.2rem);
  color: var(--clr-text-muted);
  line-height: 1.7;
  margin-bottom: 2.5rem;
  max-width: 600px;
  animation: fadeSlideIn 0.6s var(--ease-out) 0.2s both;
}
.hero-cta {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
  animation: fadeSlideIn 0.6s var(--ease-out) 0.3s both;
}
.hero-stats {
  display: flex;
  gap: 2.5rem;
  flex-wrap: wrap;
  margin-top: 4rem;
  padding-top: 2.5rem;
  border-top: 1px solid var(--clr-border);
  animation: fadeSlideIn 0.6s var(--ease-out) 0.45s both;
}
.hero-terminal {
  position: relative;
  flex: 0 1 520px;
  width: 100%;
  max-width: 520px;
  min-width: 340px;
  background: var(--clr-surface);
  border: 1px solid var(--clr-border-2);
  border-radius: 12px;
  overflow: hidden;
  box-shadow: var(--shadow-deep), 0 0 48px rgba(30,155,255,0.06);
  animation: floatIn 0.6s var(--ease-out) 0.2s both;
  z-index: 1;
  transition: transform 0.4s var(--ease-out), box-shadow 0.4s var(--ease-out);
}
[data-theme="light"] .hero-terminal:hover {
  box-shadow:
    var(--shadow-deep),
    0 0 0 1px rgba(255,255,255,0.03) inset,
    0 30px 90px -18px rgba(0,0,0,0.6),
    0 0 90px rgba(30,155,255,0.14);
}
.terminal-header {
  position: relative;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.85rem 1.25rem;
  background: var(--clr-surface-2);
  border-bottom: 1px solid var(--clr-border);
}
.terminal-dot { width: 10px; height: 10px; border-radius: 50%; transition: filter 0.2s ease; }
.terminal-dot-r { background: #ff5f57; }
.terminal-dot-y { background: #ffbd2e; }
.terminal-dot-g { background: #5ac8fa; }
.terminal-header:hover .terminal-dot { filter: brightness(1.25); }
.terminal-title {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--clr-text-dim);
  letter-spacing: 0.02em;
  margin-left: auto; margin-right: auto;
}
.terminal-body {
  position: relative;
  padding: 1.35rem 1.5rem;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  line-height: 1.85;
  color: #cdd6f4;
  background-image: repeating-linear-gradient(rgba(255,255,255,0.012) 0px, rgba(255,255,255,0.012) 1px, transparent 1px, transparent 2px);
}
.terminal-line {
  display: block;
  white-space: pre;
  opacity: 0;
  transform: translateY(4px);
  animation: lineIn 0.35s var(--ease-out) both;
  animation-delay: calc(0.5s + var(--d, 1) * 0.16s);
}
.t-prompt { color: var(--clr-accent); font-weight: 600; }
.t-cmd    { color: #89b4fa; }
.t-str    { color: #7dd3fc; }
.t-out    { color: var(--clr-text-dim); }
.t-cursor {
  display: inline-block;
  width: 7px; height: 1em;
  margin-left: 2px;
  background: var(--clr-accent);
  vertical-align: text-bottom;
  border-radius: 1px;
  animation: blink 1.1s step-end infinite;
}
@keyframes blink { 50% { opacity: 0; } }
@keyframes lineIn {
  from { opacity: 0; transform: translateY(4px); }
  to   { opacity: 1; transform: translateY(0); }
}

.topics-section { padding: 4.5rem 0; }

.section-title {
  font-size: clamp(1.9rem, 3.5vw, 2.75rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  margin-bottom: 0.6rem;
  line-height: 1.1;
}
.section-subtitle {
  font-size: 0.95rem;
  color: var(--clr-text-muted);
  max-width: 520px;
  line-height: 1.65;
}

.topics-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.25rem;
  margin-top: 2.5rem;
}

.topic-card {
  background: var(--clr-surface);
  border: 1px solid var(--clr-border);
  border-radius: 20px;
  padding: 1.75rem;
  transition: transform 0.4s var(--ease-out), border-color 0.4s, box-shadow 0.4s;
  position: relative;
  overflow: hidden;
  cursor: pointer;
  display: flex;
  flex-direction: column;
  box-shadow: 0 1px 4px rgba(0,0,0,0.15), 0 1px 0 rgba(255,255,255,0.03) inset;
}
.topic-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--card-accent, var(--clr-accent)), var(--card-accent-2, var(--clr-accent-2)));
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.45s var(--ease-out);
  z-index: 1;
}
.topic-card:hover {
  transform: translateY(-2px);
  border-color: var(--card-accent, var(--clr-accent));
  box-shadow: var(--shadow-card);
}
.topic-card:hover::before { transform: scaleX(1); }
.topic-card:focus-visible {
  outline: 2px solid var(--clr-accent);
  outline-offset: 3px;
  transform: none;
}

.topic-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 52px; height: 52px;
  border-radius: 14px;
  margin-bottom: 1.3rem;
  flex-shrink: 0;
  background: var(--card-icon-bg, rgba(30,155,255,0.1));
  border: 1px solid var(--card-icon-border, rgba(30,155,255,0.2));
  transition: transform 0.35s var(--ease-spring), box-shadow 0.35s, background 0.35s;
  position: relative;
}
.topic-card:hover .topic-icon {
  box-shadow: 0 8px 28px var(--card-icon-shadow, rgba(30,155,255,0.3));
  background: var(--card-icon-bg-hover, rgba(30,155,255,0.16));
}
.home-course-icon svg,
.home-course-icon img {
  width: 24px; height: 24px;
  stroke: var(--card-accent, var(--clr-accent));
  color: var(--card-accent, var(--clr-accent));
  flex-shrink: 0;
  transition: transform 0.3s;
}

.topic-name {
  font-family: var(--font-display);
  font-size: 1.05rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
  letter-spacing: -0.015em;
  color: var(--clr-text);
  line-height: 1.3;
}
.topic-desc {
  font-size: 0.875rem;
  color: var(--clr-text-muted);
  line-height: 1.65;
  margin-bottom: 1.5rem;
  flex: 1;
}
.topic-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 1rem;
  border-top: 1px solid var(--clr-border);
  margin-top: auto;
}
.topic-lessons {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 500;
  color: #b4bfd1;
  background: var(--clr-surface-2);
  border: 1px solid rgba(180,191,209,0.22);
  padding: 0.25rem 0.7rem;
  border-radius: 8px;
  letter-spacing: 0.03em;
}
.topic-link {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--card-accent, var(--clr-accent));
  letter-spacing: 0.01em;
  transition: gap 0.2s;
}
.topic-link:hover { gap: 0.6rem; }
.topic-link svg { transition: transform 0.2s; }
.topic-link:hover svg { transform: translateX(3px); }

.card-default, .card-python {
  --card-accent:        #1e9bff;
  --card-accent-2:      #6cc8ff;
  --card-icon-bg:       rgba(30,155,255,0.09);
  --card-icon-border:   rgba(30,155,255,0.2);
  --card-icon-bg-hover: rgba(30,155,255,0.18);
  --card-icon-shadow:   rgba(30,155,255,0.32);
}
.card-bash {
  --card-accent:        #6cc8ff;
  --card-accent-2:      #1e9bff;
  --card-icon-bg:       rgba(108,200,255,0.09);
  --card-icon-border:   rgba(108,200,255,0.2);
  --card-icon-bg-hover: rgba(108,200,255,0.18);
  --card-icon-shadow:   rgba(108,200,255,0.32);
}
.card-web {
  --card-accent:        #8cc4ff;
  --card-accent-2:      #2b6fe0;
  --card-icon-bg:       rgba(43,111,224,0.09);
  --card-icon-border:   rgba(43,111,224,0.22);
  --card-icon-bg-hover: rgba(43,111,224,0.18);
  --card-icon-shadow:   rgba(140,196,255,0.35);
}

[data-theme="light"] .topic-card {
  background: #ffffff;
  border-color: rgba(84,112,153,0.13);
  box-shadow: 0 2px 12px rgba(13,16,35,0.07), 0 1px 0 rgba(255,255,255,1) inset;
}
[data-theme="light"] .topic-card:hover {
  box-shadow: 0 20px 52px rgba(13,16,35,0.14), 0 0 0 1.5px var(--card-accent);
  border-color: var(--card-accent);
}
[data-theme="light"] .topic-lessons {
  background: #f2f4fb;
  border-color: rgba(84,112,153,0.14);
  color: #5d6b8a;
}
[data-theme="light"] .topic-meta { border-top-color: rgba(84,112,153,0.1); }

[data-theme="light"] .card-default,
[data-theme="light"] .card-python {
  --card-accent:        #0a68d6;
  --card-accent-2:      #0b72b5;
  --card-icon-bg:       rgba(10,104,214,0.09);
  --card-icon-border:   rgba(10,104,214,0.2);
  --card-icon-bg-hover: rgba(10,104,214,0.16);
  --card-icon-shadow:   rgba(10,104,214,0.25);
}
[data-theme="light"] .card-bash {
  --card-accent:        #0b72b5;
  --card-accent-2:      #064a9c;
  --card-icon-bg:       rgba(11,114,181,0.09);
  --card-icon-border:   rgba(11,114,181,0.2);
  --card-icon-bg-hover: rgba(11,114,181,0.16);
  --card-icon-shadow:   rgba(11,114,181,0.25);
}
[data-theme="light"] .card-web {
  --card-accent:        #2f5fcf;
  --card-accent-2:      #2b6fe0;
  --card-icon-bg:       rgba(10,104,214,0.09);
  --card-icon-border:   rgba(10,104,214,0.2);
  --card-icon-bg-hover: rgba(10,104,214,0.16);
  --card-icon-shadow:   rgba(10,104,214,0.25);
}

.features-strip {
  background: linear-gradient(180deg, var(--clr-surface) 0%, rgba(18,24,35,0.55) 100%);
  border-top: 1px solid var(--clr-border);
  border-bottom: 1px solid var(--clr-border);
  padding: 3rem 0;
}
[data-theme="light"] .features-strip {
  background: linear-gradient(180deg, #ffffff 0%, rgba(237,244,252,0.7) 100%);
  border-color: rgba(84,112,153,0.1);
}
.features-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 2rem;
}
.feature-item {
  text-align: center;
  padding: 1.5rem 1rem;
  border-radius: var(--radius-md);
  transition: background 0.3s, transform 0.3s;
}
.feature-item:hover {
  background: rgba(30,155,255,0.04);
  transform: translateY(-2px);
}
[data-theme="light"] .feature-item:hover { background: rgba(10,104,214,0.05); }
.feature-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 52px; height: 52px;
  background: rgba(30,155,255,0.08);
  border: 1px solid rgba(30,155,255,0.18);
  border-radius: var(--radius-md);
  color: var(--clr-accent);
  margin: 0 auto 1rem;
  transition: background 0.3s, box-shadow 0.3s, transform 0.3s;
}
[data-theme="light"] .feature-icon {
  background: rgba(10,104,214,0.08);
  border-color: rgba(10,104,214,0.16);
}
.feature-item:hover .feature-icon {
  background: rgba(30,155,255,0.14);
}
[data-theme="light"] .feature-item:hover .feature-icon {
  background: rgba(10,104,214,0.14);
}
.feature-icon svg { width: 22px; height: 22px; stroke: var(--clr-accent); flex-shrink: 0; }
.feature-name { font-size: 0.9rem; font-weight: 600; margin-bottom: 0.35rem; }
.feature-desc { font-size: 0.8rem; color: var(--clr-text-muted); line-height: 1.5; }

.cta-section { padding: 0 0 4rem; }
.cta-banner {
  position: relative;
  background: linear-gradient(135deg, rgba(30,155,255,0.08) 0%, rgba(108,200,255,0.05) 50%, rgba(43,111,224,0.08) 100%);
  border: 1px solid rgba(30,155,255,0.15);
  border-radius: var(--radius-xl);
  padding: 3.5rem 2.5rem;
  text-align: center;
  overflow: hidden;
}
[data-theme="light"] .cta-banner {
  background: linear-gradient(135deg, rgba(10,104,214,0.06) 0%, rgba(11,114,181,0.04) 50%, rgba(10,104,214,0.06) 100%);
  border-color: rgba(10,104,214,0.18);
  box-shadow: 0 4px 28px rgba(13,16,35,0.07);
}
.cta-banner-title {
  font-size: clamp(1.75rem, 4vw, 3rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  margin-bottom: 1rem;
  position: relative;
}
.cta-banner-sub {
  font-size: 1.0625rem;
  color: var(--clr-text-muted);
  margin-bottom: 2rem;
  position: relative;
}
.cta-banner-actions {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1rem;
  flex-wrap: wrap;
  position: relative;
}

@keyframes fadeSlideIn {
  from { opacity: 0; transform: translateY(20px); }
  to   { opacity: 1; transform: translateY(0); }
}
@keyframes floatIn {
  from { opacity: 0; transform: translateX(30px); }
  to   { opacity: 1; transform: translateX(0); }
}

.hero-inner { flex-wrap: wrap; }

@media (max-width: 980px) {
  .hero-inner    { justify-content: center; }
  .hero-content  { flex-basis: 100%; max-width: 640px; text-align: center; }
  .hero-pretitle { justify-content: center; }
  .hero-cta      { justify-content: center; }
  .hero-stats    { justify-content: center; }
  .hero-terminal { flex-basis: 100%; max-width: 560px; margin-top: 1rem; }
  .topics-grid   { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 560px) {
  .hero-terminal { display: none; }
}
@media (max-width: 768px) {
  .topics-grid    { grid-template-columns: 1fr; }
  .features-grid  { grid-template-columns: 1fr 1fr; }
  .cta-banner     { padding: 2.5rem 1.5rem; }
  .hero { min-height: 80vh; }
}
@media (max-width: 480px) {
  .features-grid { grid-template-columns: 1fr; }
  .hero-stats    { gap: 1.5rem; }
}


.post-card-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  font-family: var(--font-mono);
  font-size: 0.65rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--clr-accent);
  background: rgba(30,155,255,0.10);
  border: 1px solid rgba(30,155,255,0.3);
  border-radius: 999px;
  padding: 0.22rem 0.75rem;
  margin-bottom: 0.75rem;
  width: fit-content;
  transition: background 0.2s, border-color 0.2s, box-shadow 0.2s;
  text-decoration: none;
}
.post-card-badge::before {
  content: '';
  display: inline-block;
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--clr-accent);
  flex-shrink: 0;
}
.post-card-badge:hover {
  border-color: rgba(30,155,255,0.5);
}

.hiw-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.5rem;
  max-width: 900px;
  margin: 0 auto;
}
.hiw-step {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  padding: 1.75rem 1.75rem 1.5rem;
  background: var(--clr-surface);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-lg, 16px);
  text-decoration: none;
  color: inherit;
  overflow: hidden;
  transition: transform 0.25s var(--ease-out, ease), border-color 0.25s, box-shadow 0.25s;
}
.hiw-step::before {
  content: '';
  position: absolute;
  inset: 0 0 auto 0;
  height: 3px;
  background: linear-gradient(90deg, var(--clr-accent), var(--clr-accent-2));
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.35s var(--ease-out, ease);
}
.hiw-step:hover {
  transform: translateY(-3px);
  border-color: var(--clr-border-2);
  box-shadow: 0 16px 40px rgba(0,0,0,0.25);
}
.hiw-step:hover::before { transform: scaleX(1); }
.hiw-num {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--clr-accent);
  opacity: 0.7;
}
.hiw-title {
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  margin: 0;
}
.hiw-desc {
  font-size: 0.9rem;
  line-height: 1.65;
  color: var(--clr-text-muted);
  margin: 0;
  flex: 1;
}
.hiw-link {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--clr-accent);
  margin-top: 0.5rem;
}
.hiw-step:hover .hiw-link svg { transform: translateX(4px); }
.hiw-link svg { transition: transform 0.25s var(--ease-out, ease); }

@media (max-width: 700px) {
  .hiw-grid { grid-template-columns: 1fr; }
}

.welcome-back-strip {
  padding: 1.25rem 0;
  position: relative;
  z-index: 2;
}
.wb-card {
  display: flex;
  align-items: center;
  gap: 1.25rem;
  padding: 1.1rem 1.5rem;
  background: var(--clr-surface);
  border: 1px solid var(--clr-border-2);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
  flex-wrap: wrap;
}
.wb-flame {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 52px;
  height: 52px;
  border-radius: 50%;
  flex-shrink: 0;
  background: var(--clr-surface-2);
  color: var(--clr-text-dim);
}
.wb-flame-lit {
  background: rgba(30,155,255,0.12);
  color: var(--clr-accent);
  box-shadow: 0 0 0 1px rgba(30,155,255,0.25) inset;
}
.wb-flame-risk {
  background: rgba(255,176,32,0.12);
  color: #ffb020;
  animation: streakPillPulse 2s ease-in-out infinite;
}
.wb-info { flex: 1; min-width: 220px; }
.wb-headline {
  font-size: 1rem;
  font-weight: 600;
  color: var(--clr-text);
  margin-bottom: 0.55rem;
}
.wb-headline strong { color: var(--clr-accent); }
.wb-meta {
  display: flex;
  align-items: center;
  gap: 0.65rem;
}
.wb-next {
  margin: 0.65rem 0 0;
  font-size: 0.85rem;
  line-height: 1.45;
  color: var(--clr-text-muted);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.25rem 0.5rem;
}
.wb-next strong { color: var(--clr-text); font-weight: 600; }
.wb-next-count {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  line-height: 1;
  padding: 0.28rem 0.5rem;
  border-radius: 999px;
  border: 1px solid var(--clr-border-2);
  color: var(--clr-text-muted);
  white-space: nowrap;
}
.wb-level {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--clr-text-muted);
  white-space: nowrap;
}
.wb-xp-bar {
  flex: 1;
  max-width: 220px;
  height: 6px;
  border-radius: 999px;
  background: var(--clr-surface-2);
  overflow: hidden;
}
.wb-xp-fill {
  height: 100%;
  border-radius: 999px;
  background: linear-gradient(90deg, var(--clr-accent), var(--clr-accent-2));
}
.wb-xp-text {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--clr-text-dim);
  white-space: nowrap;
}
.wb-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  flex-shrink: 0;
}
.wb-btn { padding: 0.6rem 1.1rem !important; font-size: 0.85rem !important; white-space: normal !important; text-align: center; justify-content: center; line-height: 1.3; height: auto; max-width: 340px; }

@media (max-width: 640px) {
  .wb-card { padding: 1rem; }
  .wb-actions { flex-direction: column; align-items: stretch; width: 100%; }
  .wb-actions .wb-btn { flex: 0 0 auto; width: 100%; max-width: none; min-width: 0; padding: 0.7rem 1rem !important; }
  .topic-link { min-height: 40px; }
  .post-card-badge { min-height: 28px; }
}