:root {
  --radius-xl: 28px;
  --radius-lg: 20px;
  --radius-md: 14px;
  --container: 1100px;
  --shadow-dark: 0 20px 60px rgba(0, 0, 0, 0.35);
  --shadow-light: 0 20px 50px rgba(15, 23, 42, 0.08);
  --transition: 0.3s ease;
}

body[data-theme="dark"] {
  --bg: #05070b;
  --bg-soft: #0b1220;
  --card: rgba(255, 255, 255, 0.04);
  --card-strong: rgba(255, 255, 255, 0.08);
  --text: #f8fbff;
  --muted: #9fb0c7;
  --line: rgba(148, 163, 184, 0.14);
  --accent: #3b82f6;
  --accent-hover: #2563eb;
  --accent-soft: rgba(59, 130, 246, 0.16);
  --tag-bg: rgba(255, 255, 255, 0.04);
  --btn-secondary-bg: rgba(255, 255, 255, 0.03);
  --btn-secondary-hover: rgba(255, 255, 255, 0.08);
  --topbar-bg: rgba(5, 7, 11, 0.72);
  --hero-bg:
    radial-gradient(circle at top left, rgba(37, 99, 235, 0.2), transparent 30%),
    radial-gradient(circle at top right, rgba(96, 165, 250, 0.12), transparent 25%),
    linear-gradient(180deg, #04060a 0%, #0a101b 100%);
  --shadow: var(--shadow-dark);
}

body[data-theme="light"] {
  --bg: #eef4fb;
  --bg-soft: #ffffff;
  --card: rgba(255, 255, 255, 0.82);
  --card-strong: rgba(255, 255, 255, 0.94);
  --text: #0f172a;
  --muted: #526277;
  --line: rgba(15, 23, 42, 0.08);
  --accent: #2563eb;
  --accent-hover: #1d4ed8;
  --accent-soft: rgba(37, 99, 235, 0.1);
  --tag-bg: rgba(15, 23, 42, 0.035);
  --btn-secondary-bg: rgba(15, 23, 42, 0.04);
  --btn-secondary-hover: rgba(15, 23, 42, 0.08);
  --topbar-bg: rgba(255, 255, 255, 0.74);
  --hero-bg:
    radial-gradient(circle at top left, rgba(59, 130, 246, 0.1), transparent 30%),
    radial-gradient(circle at top right, rgba(147, 197, 253, 0.1), transparent 26%),
    linear-gradient(180deg, #f8fbff 0%, #eaf1f9 100%);
  --shadow: var(--shadow-light);
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: Inter, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background: var(--hero-bg);
  color: var(--text);
  line-height: 1.65;
  transition: background var(--transition), color var(--transition);
}

img {
  display: block;
  max-width: 100%;
}

a {
  color: inherit;
  text-decoration: none;
}

.container {
  width: min(calc(100% - 40px), var(--container));
  margin: 0 auto;
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 30;
  backdrop-filter: blur(14px);
  background: var(--topbar-bg);
  border-bottom: 1px solid var(--line);
}

.topbar-inner {
  min-height: 78px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}

.logo {
  width: 48px;
  height: 48px;
  display: grid;
  place-items: center;
  border-radius: 14px;
  background: linear-gradient(135deg, #1d4ed8, #60a5fa);
  color: white;
  font-weight: 800;
  letter-spacing: 0.08em;
  box-shadow: var(--shadow);
}

.topbar-actions {
  display: flex;
  align-items: center;
  gap: 14px;
}

.back-link {
  display: inline-flex;
  align-items: center;
  min-height: 46px;
  padding: 0 16px;
  border-radius: 12px;
  border: 1px solid var(--line);
  background: var(--btn-secondary-bg);
  color: var(--text);
  font-weight: 700;
  transition: background var(--transition), transform var(--transition), border-color var(--transition);
}

.back-link:hover,
.theme-toggle:hover,
.panel:hover,
.mockup:hover {
  transform: translateY(-4px);
}

.back-link:hover,
.theme-toggle:hover {
  background: var(--btn-secondary-hover);
}

.theme-toggle {
  width: 52px;
  height: 52px;
  padding: 0;
  border: 1px solid var(--line);
  background: var(--btn-secondary-bg);
  color: var(--text);
  border-radius: 14px;
  display: grid;
  place-items: center;
  cursor: pointer;
  transition: background var(--transition), color var(--transition), border-color var(--transition), transform var(--transition);
  position: relative;
  overflow: hidden;
}

.theme-icon {
  position: absolute;
  width: 22px;
  height: 22px;
  display: grid;
  place-items: center;
  transition: opacity var(--transition), transform var(--transition);
}

.theme-icon svg {
  width: 22px;
  height: 22px;
  stroke: currentColor;
  stroke-width: 1.8;
  stroke-linecap: round;
  stroke-linejoin: round;
}

body[data-theme="dark"] .theme-icon-sun {
  opacity: 1;
  transform: rotate(0deg) scale(1);
}

body[data-theme="dark"] .theme-icon-moon {
  opacity: 0;
  transform: rotate(-90deg) scale(0.6);
}

body[data-theme="light"] .theme-icon-sun {
  opacity: 0;
  transform: rotate(90deg) scale(0.6);
}

body[data-theme="light"] .theme-icon-moon {
  opacity: 1;
  transform: rotate(0deg) scale(1);
}

.project-hero {
  padding: 56px 0 24px;
}

.hero-card,
.panel,
.mockup {
  background: var(--card);
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
}

.hero-card {
  border-radius: var(--radius-xl);
  padding: 38px;
}

.eyebrow {
  display: inline-block;
  color: var(--accent);
  font-size: 0.9rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: 16px;
}

.hero-title {
  font-size: clamp(2.5rem, 6vw, 4.8rem);
  line-height: 0.98;
  letter-spacing: -0.04em;
  max-width: 12ch;
  margin-bottom: 18px;
}

.hero-description {
  max-width: 62ch;
  color: var(--muted);
  font-size: 1.05rem;
  margin-bottom: 26px;
}

.hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.meta-pill {
  padding: 10px 14px;
  border-radius: 999px;
  background: var(--tag-bg);
  border: 1px solid var(--line);
  color: var(--text);
  font-size: 0.95rem;
}

.section {
  padding: 22px 0;
}

.content-grid {
  display: grid;
  grid-template-columns: 1.3fr 0.7fr;
  gap: 22px;
  align-items: start;
}

.main-column,
.side-column {
  display: grid;
  gap: 22px;
}

.panel {
  border-radius: var(--radius-lg);
  padding: 28px;
  transition: transform 0.25s ease, border-color 0.25s ease, background 0.25s ease;
}

.panel:hover {
  border-color: rgba(59, 130, 246, 0.35);
}

.panel h2 {
  font-size: 1.45rem;
  margin-bottom: 14px;
  line-height: 1.2;
}

.panel h3 {
  font-size: 1.1rem;
  margin-bottom: 10px;
}

.panel p,
.feature-list li,
.role-list li,
.link-list li,
.footer p,
.footer a {
  color: var(--muted);
}

.panel p + p {
  margin-top: 14px;
}

.stack-list,
.feature-list,
.role-list,
.link-list {
  display: grid;
  gap: 12px;
  list-style: none;
}

.feature-list li,
.role-list li,
.link-list li {
  padding-left: 18px;
  position: relative;
}

.feature-list li::before,
.role-list li::before,
.link-list li::before {
  content: "";
  width: 7px;
  height: 7px;
  border-radius: 999px;
  background: var(--accent);
  position: absolute;
  left: 0;
  top: 0.72em;
}

.stack-list {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.stack-list li {
  padding: 12px 14px;
  border-radius: 14px;
  background: var(--tag-bg);
  border: 1px solid var(--line);
  color: var(--text);
  font-weight: 600;
}

.links a {
  color: var(--accent);
  font-weight: 700;
}

.links a:hover,
.footer a:hover {
  color: var(--accent);
}

.highlight-box {
  background: linear-gradient(180deg, var(--accent-soft), rgba(255, 255, 255, 0.02));
  border: 1px solid var(--line);
}

.mockup-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}

.mockup {
  border-radius: 20px;
  overflow: hidden;
  transition: transform 0.3s ease;
}

.footer {
  margin-top: 40px;
  border-top: 1px solid var(--line);
  padding: 24px 0 36px;
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  align-items: center;
}

@media (max-width: 900px) {
  .content-grid {
    grid-template-columns: 1fr;
  }

  .stack-list {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  .container {
    width: min(calc(100% - 24px), var(--container));
  }

  .topbar-inner {
    flex-direction: column;
    justify-content: center;
    padding: 14px 0;
  }

  .topbar-actions {
    width: 100%;
    justify-content: center;
    flex-wrap: wrap;
  }

  .project-hero {
    padding: 24px 0 16px;
  }

  .hero-card,
  .panel {
    padding: 22px;
  }

  .hero-title {
    font-size: clamp(2.1rem, 10vw, 3.3rem);
    line-height: 1.02;
    max-width: 100%;
  }

  .hero-description {
    font-size: 1rem;
    margin-bottom: 22px;
  }

  .hero-meta,
  .feature-list,
  .role-list,
  .link-list,
  .stack-list {
    gap: 10px;
  }

  .mockup-grid {
    grid-template-columns: 1fr;
  }

  .footer {
    margin-top: 28px;
    padding: 22px 0 28px;
  }

  .footer-inner {
    flex-direction: column;
    text-align: center;
    gap: 12px;
  }
}