/* ============================================================
   ClipSave Landing Page — Style
   ============================================================ */

/* --- Reset & Base --- */
*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  --blue-500: #1E88E5;
  --blue-400: #42A5F5;
  --bg-primary: #0B0F1A;
  --bg-secondary: #111827;
  --bg-card: #1A2035;
  --bg-card-hover: #1F2847;
  --text-primary: #F1F5F9;
  --text-secondary: #94A3B8;
  --text-muted: #64748B;
  --border: #1E293B;
  --radius: 12px;
  --radius-sm: 8px;
  --radius-lg: 20px;
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --font: "Segoe UI", "Hiragino Sans", "Noto Sans JP", sans-serif;
  --font-mono: "Cascadia Code", "Consolas", monospace;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 80px;
}

body {
  font-family: var(--font);
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

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

a:focus-visible,
button:focus-visible,
summary:focus-visible {
  outline: 2px solid var(--blue-400);
  outline-offset: 3px;
}

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

/* --- Container --- */
.container {
  max-width: 1120px;
  margin: 0 auto;
  padding: 0 24px;
}

/* --- Skip link --- */
.skip-link {
  position: fixed;
  top: 12px;
  left: 12px;
  z-index: 200;
  padding: 8px 12px;
  border-radius: 6px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  color: var(--text-primary);
  transform: translateY(-140%);
  transition: transform var(--transition);
}

.skip-link:focus-visible {
  transform: translateY(0);
}

/* --- Header --- */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: rgba(11, 15, 26, 0.85);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border);
  transition: border-bottom-color var(--transition);
}

.header.scrolled {
  border-bottom-color: rgba(30, 41, 59, 0.8);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 700;
  font-size: 1.15rem;
  color: var(--text-primary);
}

.logo-image {
  width: 28px;
  height: 28px;
  flex-shrink: 0;
  border-radius: 6px;
}

.nav {
  display: flex;
  align-items: center;
  gap: 32px;
}

.nav a {
  font-size: 0.9rem;
  color: var(--text-secondary);
  transition: color var(--transition);
}

.nav a:hover {
  color: var(--text-primary);
}

.mobile-menu-btn {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}

.mobile-menu-btn span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--text-secondary);
  border-radius: 2px;
  transition: var(--transition);
}

/* --- Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font);
  font-weight: 600;
  border: none;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all var(--transition);
  text-decoration: none;
  white-space: nowrap;
}

.btn-sm {
  font-size: 0.85rem;
  padding: 6px 16px;
}

.btn-lg {
  font-size: 1rem;
  padding: 14px 28px;
}

.btn-primary {
  background: linear-gradient(135deg, var(--blue-500), var(--blue-400));
  color: #fff;
  box-shadow: 0 4px 20px rgba(30, 136, 229, 0.3);
}

.btn-primary:hover {
  box-shadow: 0 6px 28px rgba(30, 136, 229, 0.45);
  transform: translateY(-1px);
}

.btn-outline {
  background: transparent;
  color: var(--text-primary);
  border: 1px solid var(--border);
}

.btn-outline:hover {
  border-color: var(--blue-400);
  color: var(--blue-400);
}

.nav .btn-sm {
  background: linear-gradient(135deg, var(--blue-500), var(--blue-400));
  color: #fff;
  border-radius: 6px;
}

.nav .btn-sm:hover {
  box-shadow: 0 4px 16px rgba(30, 136, 229, 0.3);
}

/* --- Background grid pattern --- */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  background-image:
    linear-gradient(rgba(30, 136, 229, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(30, 136, 229, 0.03) 1px, transparent 1px);
  background-size: 60px 60px;
  pointer-events: none;
  z-index: -1;
}

/* --- Hero --- */
.hero {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  padding: 80px 0 0;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: "";
  position: absolute;
  top: -200px;
  left: 50%;
  transform: translateX(-50%);
  width: 800px;
  height: 800px;
  background: radial-gradient(circle, rgba(30, 136, 229, 0.12) 0%, transparent 70%);
  pointer-events: none;
  animation: heroGlow 8s ease-in-out infinite alternate;
}

@keyframes heroGlow {
  0% {
    opacity: 0.6;
    transform: translateX(-50%) scale(1);
  }

  100% {
    opacity: 1;
    transform: translateX(-50%) scale(1.15);
  }
}

.hero-inner {
  flex: 1;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}

.hero-title {
  font-size: 3rem;
  font-weight: 800;
  line-height: 1.25;
  letter-spacing: -0.02em;
}

.gradient-text {
  background: linear-gradient(135deg, var(--blue-400), #80D8FF);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-subtitle {
  margin-top: 20px;
  font-size: 1.05rem;
  color: var(--text-secondary);
  line-height: 1.8;
}

.hero-subtitle kbd {
  display: inline-block;
  padding: 2px 8px;
  font-family: var(--font-mono);
  font-size: 0.85em;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 4px;
  color: var(--blue-400);
}

.hero-actions {
  margin-top: 32px;
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

.hero-meta {
  margin-top: 16px;
  font-size: 0.8rem;
  color: var(--text-muted);
}

/* --- Scroll indicator --- */
.scroll-indicator {
  display: flex;
  justify-content: center;
  flex-shrink: 0;
  padding: 16px 0 24px;
  color: var(--text-muted);
  animation: scrollBounce 2s ease-in-out infinite;
  transition: opacity var(--transition);
}

.scroll-indicator:hover {
  color: var(--blue-400);
}

@keyframes scrollBounce {

  0%,
  100% {
    transform: translateY(0);
  }

  50% {
    transform: translateY(8px);
  }
}

/* --- Hero Visual / Demo --- */
.hero-visual {
  display: flex;
  justify-content: center;
}

.demo-window {
  width: 100%;
  max-width: 400px;
  background: var(--bg-card);
  border-radius: var(--radius);
  border: 1px solid var(--border);
  overflow: hidden;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.4);
}

.demo-titlebar {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border);
}

.demo-titlebar-icon {
  color: var(--text-muted);
  opacity: 0.6;
  flex-shrink: 0;
}

.demo-title {
  font-size: 0.8rem;
  color: var(--text-muted);
  flex: 1;
}

.demo-window-controls {
  display: flex;
  align-items: center;
  gap: 2px;
  margin-left: auto;
}

.demo-win-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 22px;
  color: var(--text-muted);
  opacity: 0.5;
}

.demo-win-close:hover {
  opacity: 1;
  color: #E57373;
}

.demo-body {
  padding: 24px 20px;
}

.demo-hotkey-display {
  text-align: center;
  margin-bottom: 24px;
}

.demo-hotkey-display kbd {
  display: inline-block;
  padding: 6px 14px;
  font-family: var(--font-mono);
  font-size: 0.9rem;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 6px;
  color: var(--blue-400);
  box-shadow: 0 2px 0 var(--border);
  animation: hotkeyPulse 3s ease-in-out infinite;
}

@keyframes hotkeyPulse {

  0%,
  100% {
    box-shadow: 0 2px 0 var(--border);
  }

  50% {
    box-shadow: 0 2px 12px rgba(30, 136, 229, 0.3);
  }
}

.demo-files {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.demo-file {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 14px;
  background: var(--bg-secondary);
  border-radius: var(--radius-sm);
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-secondary);
  opacity: 0;
  transform: translateX(-10px);
  animation: fileAppear 0.5s ease forwards;
  transition: background var(--transition);
}

.demo-file:hover {
  background: var(--bg-card-hover);
}

.demo-file[data-delay="0"] {
  animation-delay: 0.8s;
}

.demo-file[data-delay="1"] {
  animation-delay: 1.4s;
}

.demo-file[data-delay="2"] {
  animation-delay: 2.0s;
}

@keyframes fileAppear {
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

/* --- Section common --- */
.section-title {
  font-size: 2rem;
  font-weight: 800;
  text-align: center;
  letter-spacing: -0.01em;
}

.section-subtitle {
  text-align: center;
  color: var(--text-secondary);
  margin-top: 8px;
  font-size: 1.05rem;
}

/* --- Features --- */
.features {
  padding: 100px 0;
  background: var(--bg-secondary);
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-top: 48px;
}

.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px 24px;
  transition: all var(--transition);
}

.feature-card:hover {
  background: var(--bg-card-hover);
  border-color: rgba(66, 165, 245, 0.2);
  transform: translateY(-4px);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.2);
}

.feature-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  border-radius: var(--radius-sm);
  background: rgba(66, 165, 245, 0.12);
  background: color-mix(in srgb, var(--accent, var(--blue-400)) 12%, transparent);
  color: var(--accent, var(--blue-400));
  margin-bottom: 16px;
  transition: transform var(--transition), box-shadow var(--transition);
}

.feature-card:hover .feature-icon {
  transform: scale(1.1);
  box-shadow: 0 0 20px rgba(66, 165, 245, 0.25);
  box-shadow: 0 0 20px color-mix(in srgb, var(--accent, var(--blue-400)) 25%, transparent);
}

.feature-card h3 {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 8px;
}

.feature-card p {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

/* --- How it works --- */
.how-it-works {
  padding: 100px 0;
}

.steps {
  max-width: 640px;
  margin: 48px auto 0;
  display: flex;
  flex-direction: column;
  align-items: stretch;
  position: relative;
}

.step {
  display: flex;
  align-items: flex-start;
  gap: 24px;
  width: 100%;
  padding: 0 0 32px;
  position: relative;
}

.step:last-child {
  padding-bottom: 0;
}

/* Vertical timeline line connecting the numbers */
.step::before {
  content: "";
  position: absolute;
  left: 21px;
  top: 44px;
  bottom: 0;
  width: 2px;
  background: var(--blue-500);
}

.step:last-child::before {
  display: none;
}

.step-number {
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--blue-500), var(--blue-400));
  color: #fff;
  font-weight: 800;
  font-size: 1.1rem;
  box-shadow: 0 4px 16px rgba(30, 136, 229, 0.3);
  position: relative;
  z-index: 1;
}

.step-content {
  padding-top: 10px;
}

.step-content h3 {
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 4px;
}

.step-content p {
  font-size: 0.95rem;
  color: var(--text-secondary);
}

.step-content kbd {
  display: inline-block;
  padding: 1px 6px;
  font-family: var(--font-mono);
  font-size: 0.8em;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 4px;
  color: var(--blue-400);
}

/* --- Details --- */
.details {
  padding: 100px 0;
  background: var(--bg-secondary);
}

.details-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
  margin-top: 48px;
}

.detail-item {
  padding: 28px 24px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  transition: all var(--transition);
}

.detail-item:hover {
  border-color: rgba(66, 165, 245, 0.15);
}

.detail-item:last-child:nth-child(odd) {
  grid-column: 1 / -1;
  max-width: 560px;
  justify-self: center;
}

.detail-item h3 {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 8px;
  color: var(--blue-400);
}

.detail-item p {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

.detail-item code {
  font-family: var(--font-mono);
  font-size: 0.85em;
  padding: 2px 6px;
  background: var(--bg-secondary);
  border-radius: 4px;
  color: var(--blue-400);
}

/* --- Download CTA --- */
.download {
  padding: 80px 0 100px;
  background: var(--bg-secondary);
}

.download-card {
  text-align: center;
  padding: 60px 40px;
  background: linear-gradient(135deg, rgba(30, 136, 229, 0.08), rgba(66, 165, 245, 0.04));
  border: 1px solid rgba(66, 165, 245, 0.15);
  border-radius: var(--radius-lg);
}

.download-card h2 {
  font-size: 2rem;
  font-weight: 800;
}

.download-card>p {
  margin-top: 8px;
  color: var(--text-secondary);
  font-size: 1.05rem;
}

.download-card kbd {
  display: inline-block;
  padding: 2px 8px;
  font-family: var(--font-mono);
  font-size: 0.85em;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 4px;
  color: var(--blue-400);
}

.download-actions {
  margin-top: 28px;
  display: flex;
  gap: 12px;
  justify-content: center;
  flex-wrap: wrap;
}

.download-meta {
  margin-top: 16px;
  font-size: 0.8rem;
  color: var(--text-muted);
}

/* --- Footer --- */
.footer {
  padding: 24px 0;
  border-top: 1px solid var(--border);
}

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

.footer-brand {
  display: flex;
  align-items: center;
  gap: 6px;
  font-weight: 700;
  font-size: 0.95rem;
  color: var(--text-muted);
}

.footer-links {
  display: flex;
  gap: 24px;
}

.footer-links a {
  font-size: 0.85rem;
  color: var(--text-muted);
  transition: color var(--transition);
}

.footer-links a:hover {
  color: var(--text-primary);
}

.footer-copy {
  font-size: 0.8rem;
  color: var(--text-muted);
}

/* --- Active nav link --- */
.nav a.active:not(.btn) {
  color: var(--blue-400);
}

/* --- FAQ --- */
.faq {
  padding: 100px 0;
}

.faq-list {
  max-width: 720px;
  margin: 48px auto 0;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.faq-item {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: border-color var(--transition);
}

.faq-item[open] {
  border-color: rgba(66, 165, 245, 0.25);
}

.faq-item summary {
  padding: 20px 24px;
  font-weight: 600;
  font-size: 0.95rem;
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  transition: color var(--transition);
}

.faq-item summary::-webkit-details-marker {
  display: none;
}

.faq-item summary::after {
  content: "+";
  font-size: 1.3rem;
  font-weight: 300;
  color: var(--text-muted);
  transition: transform var(--transition), color var(--transition);
  flex-shrink: 0;
  margin-left: 16px;
}

.faq-item[open] summary::after {
  transform: rotate(45deg);
  color: var(--blue-400);
}

.faq-item summary:hover {
  color: var(--blue-400);
}

.faq-item p {
  padding: 0 24px 20px;
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

/* --- Back to top --- */
.back-to-top {
  position: fixed;
  bottom: 32px;
  right: 32px;
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 50%;
  color: var(--text-secondary);
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transform: translateY(12px);
  transition: all var(--transition);
  z-index: 90;
  backdrop-filter: blur(8px);
}

.back-to-top.visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.back-to-top:hover {
  color: var(--blue-400);
  border-color: var(--blue-400);
  box-shadow: 0 4px 16px rgba(30, 136, 229, 0.2);
}

/* --- Fade-in animation --- */
.fade-in {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

/* --- Mobile nav overlay --- */
.nav.open {
  display: flex;
}

body.menu-open {
  overflow: hidden;
}

/* --- Responsive --- */
@media (max-width: 900px) {
  .hero-inner {
    grid-template-columns: 1fr;
    text-align: center;
  }

  .hero-title {
    font-size: 2.2rem;
  }

  .hero-actions {
    justify-content: center;
  }

  .hero-visual {
    order: -1;
  }

  .demo-window {
    max-width: 340px;
  }

  .features-grid {
    grid-template-columns: repeat(2, 1fr);
  }

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

@media (max-width: 640px) {
  .nav {
    display: none;
    position: fixed;
    top: 64px;
    left: 0;
    right: 0;
    height: calc(100dvh - 64px);
    overflow-y: auto;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 28px;
    background: rgba(11, 15, 26, 0.96);
    backdrop-filter: blur(16px);
    z-index: 99;
  }

  .nav a {
    font-size: 1.1rem;
  }

  .mobile-menu-btn {
    display: flex;
  }

  .mobile-menu-btn.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
  }

  .mobile-menu-btn.active span:nth-child(2) {
    opacity: 0;
  }

  .mobile-menu-btn.active span:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
  }

  .hero {
    padding: 80px 0 40px;
    min-height: 100svh;
  }

  .hero-title {
    font-size: 1.8rem;
  }

  .hero-subtitle {
    font-size: 0.95rem;
  }

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

  .section-title {
    font-size: 1.6rem;
  }

  .download-card {
    padding: 40px 20px;
  }

  .download-card h2 {
    font-size: 1.5rem;
  }

  .back-to-top {
    bottom: 20px;
    right: 20px;
    width: 40px;
    height: 40px;
  }

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

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    animation: none !important;
    transition-duration: 0.01ms !important;
    transition-delay: 0ms !important;
  }

  .feature-card:hover,
  .feature-card:hover .feature-icon,
  .btn-primary:hover,
  .btn-outline:hover,
  .detail-item:hover {
    transform: none !important;
  }
}