/* ==========================================================================
   English Teacher's Toolbox — Main Page Styles
   Pacific theme: ocean blues, sunset corals, palm-warm cream
   ========================================================================== */

:root {
  --color-deep: #0a2540;
  --color-ocean: #0a4d68;
  --color-teal: #088395;
  --color-sky: #5fbdff;
  --color-sand: #fdf6e3;
  --color-cream: #fffaf0;
  --color-coral: #ff6b35;
  --color-sunset: #ffb347;
  --color-text: #1a2438;
  --color-text-soft: #4a5568;
  --color-border: #e2e8f0;

  --font-display: 'Plus Jakarta Sans', 'Noto Sans JP', system-ui, sans-serif;
  --font-jp: 'Noto Sans JP', 'Plus Jakarta Sans', sans-serif;

  --shadow-sm: 0 2px 8px rgba(10, 37, 64, 0.06);
  --shadow-md: 0 8px 24px rgba(10, 37, 64, 0.10);
  --shadow-lg: 0 24px 48px rgba(10, 37, 64, 0.18);

  --radius-sm: 8px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --radius-xl: 32px;
}

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

html { scroll-behavior: smooth; }

body {
  font-family: var(--font-jp);
  color: var(--color-text);
  background: var(--color-cream);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

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

/* ============================ Header ============================ */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 250, 240, 0.85);
  backdrop-filter: saturate(180%) blur(20px);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  border-bottom: 1px solid rgba(10, 37, 64, 0.06);
}

.header-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 16px 28px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  position: relative;
}

.brand {
  display: flex;
  align-items: center;
  flex-shrink: 0;
}

.brand-logo {
  height: 36px;
  width: auto;
  display: block;
}

.site-nav {
  display: flex;
  gap: 28px;
  font-size: 14px;
  font-weight: 600;
  color: var(--color-text-soft);
}

.site-nav a {
  position: relative;
  transition: color 0.2s ease;
}

.site-nav a:hover { color: var(--color-coral); }

/* Hamburger toggle (mobile only) */
.nav-toggle {
  display: none;
  width: 44px;
  height: 44px;
  background: transparent;
  border: 1px solid var(--color-border);
  border-radius: 10px;
  cursor: pointer;
  position: relative;
  flex-shrink: 0;
  padding: 0;
}

.nav-toggle-bar {
  position: absolute;
  left: 50%;
  width: 20px;
  height: 2px;
  background: var(--color-deep);
  border-radius: 2px;
  transform: translateX(-50%);
  transition: top 0.25s ease, transform 0.25s ease, opacity 0.2s ease;
}

.nav-toggle-bar:nth-child(1) { top: 14px; }
.nav-toggle-bar:nth-child(2) { top: 21px; }
.nav-toggle-bar:nth-child(3) { top: 28px; }

.nav-toggle.is-open .nav-toggle-bar:nth-child(1) {
  top: 21px;
  transform: translateX(-50%) rotate(45deg);
}
.nav-toggle.is-open .nav-toggle-bar:nth-child(2) { opacity: 0; }
.nav-toggle.is-open .nav-toggle-bar:nth-child(3) {
  top: 21px;
  transform: translateX(-50%) rotate(-45deg);
}

/* Tablet and Mobile (≤900px): show hamburger, hide inline nav */
@media (max-width: 900px) {
  .nav-toggle { display: block; }

  .site-nav {
    position: absolute;
    top: 100%;
    left: 16px;
    right: 16px;
    margin-top: 8px;
    flex-direction: column;
    gap: 4px;
    padding: 12px;
    background: rgba(255, 250, 240, 0.98);
    backdrop-filter: saturate(180%) blur(20px);
    -webkit-backdrop-filter: saturate(180%) blur(20px);
    border: 1px solid rgba(10, 37, 64, 0.08);
    border-radius: 16px;
    box-shadow: 0 16px 40px rgba(10, 37, 64, 0.18);
    transform: translateY(-12px) scale(0.98);
    transform-origin: top right;
    opacity: 0;
    pointer-events: none;
    transition: transform 0.25s cubic-bezier(0.16, 1, 0.3, 1), opacity 0.2s ease;
    z-index: 50;
  }

  .site-nav.is-open {
    transform: translateY(0) scale(1);
    opacity: 1;
    pointer-events: auto;
  }

  .site-nav a {
    display: block;
    padding: 14px 18px;
    font-size: 16px;
    color: var(--color-deep);
    border-radius: 10px;
  }

  .site-nav a:hover,
  .site-nav a.is-current {
    background: rgba(255, 107, 53, 0.10);
    color: var(--color-coral);
  }

  .site-nav a.is-current::after { display: none; }
}

@media (max-width: 480px) {
  .header-inner { padding: 14px 16px; gap: 12px; }
  .brand-logo { height: 28px; }
}

/* ============================ Hero ============================ */
.hero {
  position: relative;
  padding: 120px 28px 160px;
  overflow: hidden;
  background:
    radial-gradient(ellipse at top right, rgba(255, 179, 71, 0.18), transparent 55%),
    radial-gradient(ellipse at bottom left, rgba(95, 189, 255, 0.20), transparent 55%),
    linear-gradient(180deg, #fffaf0 0%, #fef0d7 100%);
}

.hero-bg {
  position: absolute;
  inset: 0;
  pointer-events: none;
  z-index: 0;
}

.hero-wave {
  position: absolute;
  left: -10%;
  right: -10%;
  height: 280px;
  border-radius: 50%;
  opacity: 0.45;
  filter: blur(60px);
}

.wave-1 {
  bottom: -120px;
  background: linear-gradient(120deg, #5fbdff 0%, #0a4d68 100%);
  opacity: 0.30;
}

.wave-2 {
  bottom: -200px;
  background: linear-gradient(120deg, #ff6b35 0%, #ffb347 100%);
  opacity: 0.18;
  left: 30%;
  right: -30%;
}

.wave-3 {
  top: -100px;
  right: -30%;
  left: 50%;
  height: 220px;
  background: linear-gradient(120deg, #088395 0%, #5fbdff 100%);
  opacity: 0.20;
}

.hero-content {
  position: relative;
  z-index: 1;
  max-width: 880px;
  margin: 0 auto;
  text-align: center;
}

.hero-eyebrow {
  display: inline-block;
  font-family: var(--font-display);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--color-coral);
  background: rgba(255, 107, 53, 0.10);
  padding: 8px 18px;
  border-radius: 999px;
  margin-bottom: 28px;
}

.hero-title {
  font-family: var(--font-jp);
  font-size: clamp(44px, 7vw, 88px);
  font-weight: 900;
  line-height: 1.05;
  letter-spacing: -0.02em;
  color: var(--color-deep);
  margin-bottom: 16px;
}

.hero-title-accent {
  background: linear-gradient(120deg, #ff6b35 0%, #ffb347 60%, #088395 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  display: inline-block;
}

.hero-subtitle {
  font-family: var(--font-display);
  font-size: clamp(18px, 2vw, 22px);
  font-weight: 500;
  color: var(--color-teal);
  letter-spacing: 0.04em;
  margin-bottom: 32px;
}

.hero-description {
  font-size: 17px;
  color: var(--color-text-soft);
  margin-bottom: 48px;
  line-height: 1.9;
}

.hero-cta {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  padding: 18px 36px;
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 700;
  color: white;
  background: linear-gradient(135deg, #ff6b35 0%, #ff8c4f 100%);
  border-radius: 999px;
  box-shadow: 0 12px 32px rgba(255, 107, 53, 0.40), 0 4px 12px rgba(255, 107, 53, 0.30);
  transition: all 0.25s ease;
}

.hero-cta:hover {
  transform: translateY(-3px);
  box-shadow: 0 20px 40px rgba(255, 107, 53, 0.50), 0 6px 16px rgba(255, 107, 53, 0.35);
}

.hero-cta:hover svg { transform: translateX(4px); }
.hero-cta svg { transition: transform 0.25s ease; }

/* ============================ Section common ============================ */
.section-header {
  text-align: center;
  margin-bottom: 64px;
}

.section-eyebrow {
  display: inline-block;
  font-family: var(--font-display);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--color-teal);
  margin-bottom: 12px;
}

.section-title {
  font-size: clamp(32px, 4.5vw, 52px);
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--color-deep);
  margin-bottom: 12px;
}

.section-subtitle {
  font-size: 16px;
  color: var(--color-text-soft);
}

/* ============================ Apps Grid ============================ */
.apps-section {
  padding: 100px 28px;
  max-width: 1200px;
  margin: 0 auto;
}

.apps-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 24px;
}

/* Pricing notice */
.apps-pricing-note {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  padding: 22px 26px;
  margin-bottom: 36px;
  background: linear-gradient(135deg, #fef0d7 0%, #fff5e0 100%);
  border: 1px solid rgba(255, 107, 53, 0.20);
  border-left: 4px solid var(--color-coral);
  border-radius: 16px;
  box-shadow: var(--shadow-sm);
}

.apps-pricing-icon {
  font-size: 24px;
  line-height: 1;
  flex-shrink: 0;
  margin-top: 2px;
}

.apps-pricing-note p {
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--color-text);
  margin: 0;
}

.apps-pricing-note strong {
  color: var(--color-coral);
  font-weight: 700;
}

.apps-pricing-tag {
  display: inline-block;
  font-family: var(--font-display);
  font-size: 11px;
  font-weight: 800;
  letter-spacing: 0.10em;
  padding: 3px 9px;
  border-radius: 6px;
  background: linear-gradient(135deg, #22c55e 0%, #16a34a 100%);
  color: white;
  vertical-align: 1px;
}

.apps-pricing-tag.tag-paid {
  background: linear-gradient(135deg, #f59e0b 0%, #d97706 100%);
}

/* FREE / PAID tags inside cards */
.tag-free {
  background: rgba(34, 197, 94, 0.18) !important;
  color: #15803d !important;
  border: 1px solid rgba(34, 197, 94, 0.30);
}

.app-card-featured .tag-free {
  background: rgba(34, 197, 94, 0.30) !important;
  color: #d4ffd4 !important;
  border-color: rgba(255, 255, 255, 0.25);
}

.tag-paid-soft {
  background: rgba(245, 158, 11, 0.16) !important;
  color: #b45309 !important;
  border: 1px solid rgba(245, 158, 11, 0.32);
}

.app-card {
  position: relative;
  background: white;
  border-radius: var(--radius-lg);
  padding: 40px 32px 32px;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--color-border);
  transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

.app-card::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, transparent 0%, rgba(95, 189, 255, 0.04) 100%);
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.3s ease;
}

.app-card:hover::before { opacity: 1; }

.app-card-featured {
  background: linear-gradient(135deg, #0a2540 0%, #0a4d68 60%, #088395 100%);
  color: white;
  border: none;
  cursor: pointer;
  transform-origin: center bottom;
}

.app-card-featured::after {
  content: '';
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 80% 0%, rgba(255, 107, 53, 0.40), transparent 50%),
    radial-gradient(circle at 20% 100%, rgba(255, 179, 71, 0.30), transparent 50%);
  pointer-events: none;
  opacity: 0.7;
  transition: opacity 0.3s ease;
}

.app-card-featured:hover {
  transform: translateY(-6px) scale(1.01);
  box-shadow: 0 32px 64px rgba(10, 37, 64, 0.30);
}

.app-card-featured:hover::after { opacity: 1; }

.app-card-coming {
  opacity: 0.78;
  cursor: not-allowed;
}

.app-card-coming:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.app-card-icon {
  position: relative;
  width: 72px;
  height: 72px;
  border-radius: 18px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 24px;
  background: linear-gradient(135deg, #fef0d7 0%, #ffd9b8 100%);
  color: var(--color-coral);
}

.app-card-featured .app-card-icon {
  background: linear-gradient(135deg, #ff6b35 0%, #ffb347 100%);
  color: white;
  box-shadow: 0 12px 28px rgba(255, 107, 53, 0.40);
}

.app-card-coming .app-card-icon {
  background: linear-gradient(135deg, #e2e8f0 0%, #cbd5e0 100%);
  color: var(--color-text-soft);
}

.app-card-badge {
  position: absolute;
  top: 20px;
  right: 20px;
  font-family: var(--font-display);
  font-size: 11px;
  font-weight: 800;
  letter-spacing: 0.12em;
  padding: 6px 10px;
  border-radius: 6px;
  background: linear-gradient(135deg, #ff6b35 0%, #ffb347 100%);
  color: white;
  z-index: 2;
  box-shadow: 0 4px 12px rgba(255, 107, 53, 0.40);
}

.badge-soon {
  background: rgba(74, 85, 104, 0.10);
  color: var(--color-text-soft);
  box-shadow: none;
}

.app-card-title {
  font-family: var(--font-display);
  font-size: 28px;
  font-weight: 800;
  letter-spacing: -0.01em;
  margin-bottom: 4px;
  position: relative;
  z-index: 1;
}

.app-card-jp {
  font-size: 14px;
  font-weight: 500;
  opacity: 0.7;
  margin-bottom: 16px;
  position: relative;
  z-index: 1;
}

.app-card-featured .app-card-jp { color: rgba(255, 255, 255, 0.7); }

.app-card-desc {
  font-size: 14.5px;
  line-height: 1.75;
  margin-bottom: 24px;
  flex-grow: 1;
  position: relative;
  z-index: 1;
}

.app-card-featured .app-card-desc { color: rgba(255, 255, 255, 0.85); }
.app-card-coming .app-card-desc { color: var(--color-text-soft); }

.app-card-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 24px;
  position: relative;
  z-index: 1;
}

.tag {
  display: inline-block;
  font-size: 12px;
  font-weight: 600;
  padding: 5px 12px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.15);
  color: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(10px);
}

.app-card-launch {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-display);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: white;
  position: relative;
  z-index: 1;
  align-self: flex-start;
  padding: 12px 20px;
  background: rgba(255, 255, 255, 0.15);
  border-radius: 999px;
  border: 1px solid rgba(255, 255, 255, 0.25);
  transition: all 0.25s ease;
}

.app-card-featured:hover .app-card-launch {
  background: white;
  color: var(--color-deep);
}

.app-card-featured:hover .app-card-launch svg { transform: translateX(4px); }
.app-card-launch svg { transition: transform 0.25s ease; }

/* ============================ About ============================ */
.about-section {
  padding: 100px 28px 120px;
  background: linear-gradient(180deg, var(--color-cream) 0%, #fef0d7 100%);
}

.about-content {
  max-width: 720px;
  margin: 0 auto;
  text-align: center;
}

.about-content h2 {
  font-size: clamp(28px, 4vw, 40px);
  font-weight: 800;
  color: var(--color-deep);
  margin-bottom: 28px;
  letter-spacing: -0.02em;
}

.about-content p {
  font-size: 16px;
  color: var(--color-text-soft);
  margin-bottom: 16px;
  line-height: 1.95;
}

.about-tagline {
  font-family: var(--font-display);
  font-size: 17px !important;
  font-weight: 600;
  color: var(--color-deep) !important;
  margin-top: 32px !important;
}

.heart {
  color: var(--color-coral);
  display: inline-block;
  animation: heartbeat 1.6s ease-in-out infinite;
}

@keyframes heartbeat {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.2); }
}

/* ============================ Footer ============================ */
.site-footer {
  background: var(--color-deep);
  padding: 56px 28px;
  text-align: center;
}

.footer-inner {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 20px;
}

.footer-logo {
  height: 36px;
  opacity: 0.9;
}

.footer-text {
  font-size: 13px;
  color: rgba(255, 255, 255, 0.5);
  letter-spacing: 0.04em;
}

/* ============================ Reveal animation ============================ */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.8s ease, transform 0.8s cubic-bezier(0.16, 1, 0.3, 1);
}

.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}