/* ============ How to Train Your AI Dragon ============ */
/* Light theme: white background with teal, green, blue, pink, burnt orange */

:root {
  --bg: #f2f5f2;
  --bg-raised: #e9eeeb;
  --bg-card: #fbfcfb;
  --ink: #29323a;
  --ink-dim: #566470;
  --ink-faint: #8f9ca7;
  --slate: #232b31;
  --slate-deep: #191f24;
  --teal: #128078;
  --teal-deep: #0d5f59;
  --green: #57806b;
  --green-deep: #3f6152;
  --blue: #41729e;
  --blue-deep: #2f5878;
  --pink: #c4708c;
  --pink-deep: #a94f70;
  --orange: #e65c12;
  --orange-deep: #b54508;
  --ember: #ff7a2f;
  --line: rgba(41, 50, 58, 0.13);
  --radius: 14px;
  --shadow: 0 10px 32px rgba(41, 50, 58, 0.1);
  --font-display: Georgia, "Times New Roman", serif;
  --font-body: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

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

html { scroll-behavior: smooth; }

body {
  background:
    linear-gradient(180deg, #e6ede8 0%, var(--bg) 26rem, var(--bg) 100%);
  color: var(--ink);
  font-family: var(--font-body);
  line-height: 1.6;
  overflow-x: hidden;
}

/* ---------- header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.7rem 1.4rem;
  background: rgba(240, 244, 241, 0.9);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}
.brand {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  text-decoration: none;
  color: var(--ink);
  font-family: var(--font-display);
  font-size: 1.02rem;
  white-space: nowrap;
}
.brand em { color: var(--orange); font-style: normal; }
.brand-mark { font-size: 1.4rem; }
.site-nav { display: flex; gap: 1.2rem; flex-wrap: wrap; }
.site-nav a {
  color: var(--ink-dim);
  text-decoration: none;
  font-size: 0.9rem;
  letter-spacing: 0.02em;
  transition: color 0.2s;
}
.site-nav a:hover { color: var(--teal); }

/* ---------- hero ---------- */
.hero {
  position: relative;
  text-align: center;
  padding: 6rem 1.5rem 4.5rem;
  overflow: hidden;
}
.hero-glow {
  position: absolute;
  inset: -40% -20% auto;
  height: 130%;
  background:
    radial-gradient(ellipse 55% 45% at 50% 22%, rgba(255, 122, 47, 0.14), transparent 65%),
    radial-gradient(ellipse 45% 40% at 22% 60%, rgba(87, 128, 107, 0.16), transparent 70%),
    radial-gradient(ellipse 45% 40% at 80% 48%, rgba(65, 114, 158, 0.13), transparent 70%),
    radial-gradient(ellipse 30% 25% at 60% 70%, rgba(196, 112, 140, 0.08), transparent 70%);
  pointer-events: none;
}
.hero-dragon {
  font-size: 5.2rem;
  filter: drop-shadow(0 6px 22px rgba(230, 92, 18, 0.4));
  animation: hover-float 5s ease-in-out infinite;
  position: relative;
}
@keyframes hover-float {
  0%, 100% { transform: translateY(0) rotate(-3deg); }
  50% { transform: translateY(-14px) rotate(3deg); }
}
.hero h1 {
  position: relative;
  font-family: var(--font-display);
  font-size: clamp(2.3rem, 6vw, 4rem);
  line-height: 1.12;
  margin-top: 1rem;
  letter-spacing: 0.01em;
}
.fire-text {
  background: linear-gradient(100deg, var(--green-deep) 5%, var(--teal) 30%, var(--blue) 52%, var(--pink) 74%, var(--orange));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.hero-tag {
  position: relative;
  max-width: 46rem;
  margin: 1.3rem auto 0;
  color: var(--ink-dim);
  font-size: 1.05rem;
}
.hero-ctas {
  position: relative;
  display: flex;
  gap: 0.9rem;
  justify-content: center;
  margin-top: 2rem;
  flex-wrap: wrap;
}
.btn {
  display: inline-block;
  padding: 0.72rem 1.5rem;
  border-radius: 999px;
  text-decoration: none;
  font-weight: 600;
  font-size: 0.95rem;
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform 0.15s, box-shadow 0.15s, background 0.2s;
  font-family: var(--font-body);
}
.btn:hover { transform: translateY(-2px); }
.btn-fire {
  background: linear-gradient(120deg, var(--ember), var(--orange-deep));
  color: #ffffff;
  box-shadow: 0 6px 20px rgba(230, 92, 18, 0.35);
}
.btn-ghost {
  background: transparent;
  color: var(--orange-deep);
  border-color: var(--line);
}
.btn-ghost:hover { border-color: var(--orange); }
.btn-small { padding: 0.4rem 0.95rem; font-size: 0.82rem; }
.hero-stats {
  position: relative;
  display: flex;
  justify-content: center;
  gap: clamp(1.2rem, 4vw, 3.4rem);
  margin-top: 3.2rem;
  flex-wrap: wrap;
}
.stat { display: flex; flex-direction: column; align-items: center; }
.stat-num {
  font-family: var(--font-display);
  font-size: 2rem;
  color: var(--teal-deep);
}
.stat-label { font-size: 0.8rem; color: var(--ink-faint); letter-spacing: 0.06em; text-transform: uppercase; }

/* ---------- sections ---------- */
.section {
  max-width: 72rem;
  margin: 0 auto;
  padding: 4.2rem 1.5rem 2rem;
}
.section-head { text-align: center; margin-bottom: 2.4rem; }
.kicker {
  color: var(--orange);
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.22em;
  margin-bottom: 0.5rem;
}
.section-head h2 {
  font-family: var(--font-display);
  font-size: clamp(1.7rem, 4vw, 2.5rem);
}
.section-sub {
  max-width: 44rem;
  margin: 0.8rem auto 0;
  color: var(--ink-dim);
  font-size: 0.98rem;
}

/* ---------- today's lesson ---------- */
.lesson-feature {
  background:
    radial-gradient(ellipse 80% 120% at 100% 0%, rgba(13, 148, 136, 0.05), transparent 60%),
    var(--bg-card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 2rem 2.2rem;
  max-width: 46rem;
  margin: 0 auto;
  box-shadow: var(--shadow);
}
.lesson-day-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
  margin-bottom: 0.9rem;
}
.day-badge {
  background: linear-gradient(120deg, var(--slate), var(--slate-deep));
  color: #ffd9bd;
  font-weight: 700;
  border-radius: 999px;
  padding: 0.28rem 0.9rem;
  font-size: 0.82rem;
  letter-spacing: 0.04em;
  box-shadow: inset 0 0 8px rgba(255, 122, 47, 0.25);
}
.month-badge { color: var(--blue); font-size: 0.88rem; font-weight: 600; letter-spacing: 0.04em; }
.month-badge::before { content: "⛰ "; }
.lesson-feature h3, .modal h3 {
  font-family: var(--font-display);
  font-size: 1.55rem;
  margin-bottom: 0.2rem;
  color: var(--ink);
}
.lesson-focus { color: var(--orange-deep); font-size: 0.86rem; text-transform: uppercase; letter-spacing: 0.12em; margin-bottom: 1rem; }
.lesson-body p { margin-bottom: 0.9rem; color: var(--ink); }
.lesson-block {
  border-left: 3px solid var(--green);
  background: rgba(22, 163, 74, 0.07);
  padding: 0.7rem 1rem;
  border-radius: 0 8px 8px 0;
  margin-bottom: 0.9rem;
  font-size: 0.95rem;
}
.lesson-block.tip { border-color: var(--orange); background: rgba(234, 88, 12, 0.06); }
.lesson-block strong { color: var(--orange-deep); }
.lesson-block.exercise strong { color: var(--green-deep); }
.lesson-actions { margin-top: 1.2rem; }
.btn-trained {
  background: transparent;
  border: 1px solid var(--green);
  color: var(--green-deep);
}
.btn-trained.done {
  background: var(--green-deep);
  color: #ffffff;
  border-color: var(--green-deep);
}
.today-note {
  text-align: center;
  color: var(--ink-faint);
  font-size: 0.86rem;
  max-width: 40rem;
  margin: 1.6rem auto 0;
}

/* ---------- progress ---------- */
#progress-bar-wrap { max-width: 46rem; margin: 0 auto 2.6rem; }
.progress-track {
  height: 10px;
  background: var(--bg-raised);
  border-radius: 999px;
  overflow: hidden;
  border: 1px solid var(--line);
}
.progress-fill {
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, var(--teal), var(--green), var(--ember));
  border-radius: 999px;
  transition: width 1s ease;
}
.progress-label {
  text-align: center;
  color: var(--ink-dim);
  font-size: 0.85rem;
  margin-top: 0.55rem;
}

/* ---------- month grid ---------- */
.month-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(310px, 1fr));
  gap: 1rem;
}
.month-panel {
  background: var(--bg-card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: 0 2px 10px rgba(34, 48, 60, 0.05);
}
.month-toggle {
  width: 100%;
  display: flex;
  align-items: center;
  gap: 0.8rem;
  background: none;
  border: none;
  color: var(--ink);
  padding: 1.05rem 1.15rem;
  cursor: pointer;
  text-align: left;
  font-family: var(--font-body);
}
.month-toggle:hover { background: rgba(13, 148, 136, 0.05); }
.month-emoji { font-size: 1.5rem; }
.month-titles { flex: 1; min-width: 0; }
.month-name { font-family: var(--font-display); font-size: 1.08rem; display: block; }
.month-range { color: var(--ink-faint); font-size: 0.78rem; }
.month-state { color: var(--ink-faint); font-size: 0.85rem; transition: transform 0.25s; }
.month-panel.open .month-state { transform: rotate(90deg); color: var(--teal); }
.month-lessons { display: none; border-top: 1px solid var(--line); max-height: 330px; overflow-y: auto; }
.month-panel.open .month-lessons { display: block; }
.lesson-row {
  width: 100%;
  display: flex;
  align-items: baseline;
  gap: 0.6rem;
  padding: 0.5rem 1.1rem;
  background: none;
  border: none;
  border-bottom: 1px solid rgba(34, 48, 60, 0.06);
  color: var(--ink);
  font-size: 0.88rem;
  cursor: pointer;
  text-align: left;
  font-family: var(--font-body);
}
.lesson-row:last-child { border-bottom: none; }
.lesson-row:hover:not(.locked) { background: rgba(13, 148, 136, 0.06); color: var(--teal-deep); }
.lesson-row .lr-day { color: var(--ink-faint); font-size: 0.75rem; min-width: 3.4em; }
.lesson-row .lr-title { flex: 1; }
.lesson-row.locked { color: var(--ink-faint); cursor: default; }
.lesson-row.locked .lr-title { filter: none; }
.lesson-row.today-row { color: var(--orange-deep); font-weight: 600; }
.lesson-row .lr-check { color: var(--green); font-size: 0.8rem; }

/* ---------- card deck ---------- */
.deck-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
  margin-bottom: 1.6rem;
}
.suit-filters { display: flex; gap: 0.5rem; flex-wrap: wrap; }
.suit-chip {
  border: 1px solid var(--line);
  background: var(--bg-raised);
  color: var(--ink-dim);
  border-radius: 999px;
  padding: 0.38rem 0.95rem;
  font-size: 0.82rem;
  cursor: pointer;
  transition: all 0.2s;
  font-family: var(--font-body);
}
.suit-chip:hover { color: var(--ink); border-color: var(--teal); }
.suit-chip.active { background: var(--teal); color: #ffffff; border-color: var(--teal); font-weight: 600; }
.deck-meta { display: flex; align-items: center; gap: 0.9rem; color: var(--ink-dim); font-size: 0.85rem; }

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(170px, 1fr));
  gap: 1rem;
}
.flip-card {
  perspective: 1200px;
  height: 250px;
  cursor: pointer;
}
.flip-card.hidden-by-filter { display: none; }

/* each suit owns one color of the palette */
.flip-card,
.flip-card[data-suit="Feeding"] {
  --suit: var(--teal); --suit-deep: var(--teal-deep);
  --suit-tint: #eaf4f2;
  --suit-rim: rgba(18, 128, 120, 0.4);
  --suit-glow: rgba(45, 178, 166, 0.22);
}
.flip-card[data-suit="Grooming"] {
  --suit: var(--pink); --suit-deep: var(--pink-deep);
  --suit-tint: #f8eef2;
  --suit-rim: rgba(196, 112, 140, 0.4);
  --suit-glow: rgba(228, 146, 172, 0.22);
}
.flip-card[data-suit="Training"] {
  --suit: var(--blue); --suit-deep: var(--blue-deep);
  --suit-tint: #ecf2f7;
  --suit-rim: rgba(65, 114, 158, 0.4);
  --suit-glow: rgba(120, 170, 214, 0.22);
}
.flip-card[data-suit="Health & Safety"] {
  --suit: var(--orange); --suit-deep: var(--orange-deep);
  --suit-tint: #fbf1ea;
  --suit-rim: rgba(230, 92, 18, 0.38);
  --suit-glow: rgba(255, 140, 66, 0.24);
}

.flip-inner {
  position: relative;
  width: 100%;
  height: 100%;
  transform-style: preserve-3d;
  transition: transform 0.62s cubic-bezier(0.4, 0.1, 0.2, 1);
}
.flip-card.flipped .flip-inner { transform: rotateY(180deg); }
.flip-face {
  position: absolute;
  inset: 0;
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
  border-radius: 12px;
  border: 1px solid var(--line);
  overflow: hidden;
}
/* card BACK: facedown scale hide in the suit's tint, title readable */
.flip-back {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 0.85rem;
  text-align: center;
  background-color: var(--suit-tint);
  background-image:
    /* drifting ember flecks */
    radial-gradient(circle 2px at 18% 24%, rgba(230, 92, 18, 0.4) 0 45%, transparent 100%),
    radial-gradient(circle 1.5px at 76% 18%, rgba(230, 92, 18, 0.3) 0 45%, transparent 100%),
    radial-gradient(circle 2px at 30% 60%, rgba(230, 92, 18, 0.3) 0 45%, transparent 100%),
    radial-gradient(circle 1.5px at 86% 54%, rgba(230, 92, 18, 0.35) 0 45%, transparent 100%),
    radial-gradient(circle 2px at 64% 84%, rgba(230, 92, 18, 0.28) 0 45%, transparent 100%),
    /* soft suit skylight from above */
    radial-gradient(ellipse 140% 55% at 50% -8%, var(--suit-glow), transparent 65%),
    /* overlapping scale rows, pale with suit rim light */
    radial-gradient(circle 13px at 12px 20px, rgba(255, 255, 255, 0.85) 66%, var(--suit-rim) 84%, rgba(41, 50, 58, 0.2) 97%, transparent 100%),
    radial-gradient(circle 13px at 0px 10px, rgba(255, 255, 255, 0.7) 66%, var(--suit-rim) 84%, rgba(41, 50, 58, 0.2) 97%, transparent 100%),
    radial-gradient(circle 13px at 24px 10px, rgba(255, 255, 255, 0.7) 66%, var(--suit-rim) 84%, rgba(41, 50, 58, 0.2) 97%, transparent 100%);
  background-size: auto, auto, auto, auto, auto, auto, 24px 20px, 24px 20px, 24px 20px;
  border-color: var(--suit);
  box-shadow:
    inset 0 0 0 3px rgba(255, 255, 255, 0.85),
    inset 0 0 0 4px var(--suit-rim),
    inset 0 -16px 30px -14px var(--suit-glow),
    0 3px 12px rgba(41, 50, 58, 0.12);
}
.flip-back .back-suit {
  font-size: 0.68rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--suit-deep);
  font-weight: 700;
}
.flip-back .back-icon {
  font-size: 1.9rem;
  filter: drop-shadow(0 2px 6px var(--suit-glow));
}
.flip-back .back-title {
  font-family: var(--font-display);
  font-size: 1.05rem;
  line-height: 1.25;
  font-weight: 700;
  color: var(--ink);
  background: rgba(255, 255, 255, 0.72);
  border-radius: 8px;
  padding: 0.3rem 0.45rem;
}
.flip-back .back-hint {
  font-size: 0.66rem;
  color: var(--ink-dim);
  letter-spacing: 0.1em;
  text-transform: uppercase;
}
.flip-card:hover .flip-inner { transform: rotateY(0) translateY(-4px); }
.flip-card.flipped:hover .flip-inner { transform: rotateY(180deg) translateY(-4px); }
/* card FRONT: revealed content */
.flip-front {
  transform: rotateY(180deg);
  background: linear-gradient(165deg, #fdfefd, var(--bg-raised));
  border-top: 4px solid var(--suit);
  color: var(--ink);
  padding: 0.85rem 0.9rem;
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  overflow-y: auto;
}
.flip-front .front-suit { font-size: 0.62rem; letter-spacing: 0.14em; text-transform: uppercase; color: var(--suit-deep); font-weight: 700; }
.flip-front h4 { font-family: var(--font-display); font-size: 0.98rem; line-height: 1.2; }
.flip-front .front-rule { font-size: 0.78rem; font-weight: 700; color: var(--suit-deep); }
.flip-front .front-detail { font-size: 0.73rem; line-height: 1.45; color: var(--ink-dim); }

/* ---------- about ---------- */
.about-cols {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 1.2rem;
}
.about-col {
  background: var(--bg-card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.5rem;
  box-shadow: 0 2px 10px rgba(34, 48, 60, 0.05);
  border-top: 3px solid var(--teal);
}
.about-col:nth-child(2) { border-top-color: var(--pink); }
.about-col:nth-child(3) { border-top-color: var(--blue); }
.about-col h3 { font-family: var(--font-display); margin-bottom: 0.6rem; font-size: 1.1rem; }
.about-col p { color: var(--ink-dim); font-size: 0.92rem; }

/* ---------- footer ---------- */
.site-footer {
  text-align: center;
  color: var(--ink-faint);
  padding: 3rem 1rem 2.2rem;
  font-size: 0.85rem;
  border-top: 1px solid var(--line);
  margin-top: 3rem;
}

/* ---------- modal ---------- */
.modal-backdrop[hidden] { display: none; }
.modal-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(34, 48, 60, 0.45);
  backdrop-filter: blur(4px);
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1.2rem;
}
.modal {
  position: relative;
  background: var(--bg-card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  max-width: 40rem;
  width: 100%;
  max-height: 85vh;
  overflow-y: auto;
  padding: 2rem 2.2rem;
  box-shadow: var(--shadow);
}
.modal-close {
  position: absolute;
  top: 0.8rem;
  right: 0.9rem;
  background: none;
  border: none;
  color: var(--ink-faint);
  font-size: 1.05rem;
  cursor: pointer;
}
.modal-close:hover { color: var(--orange); }

/* ---------- auth ---------- */
.auth-box[hidden] { display: none; }
.auth-box {
  display: flex;
  align-items: center;
  gap: 0.55rem;
  white-space: nowrap;
}
.auth-avatar {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  border: 2px solid var(--teal);
}
.auth-name { color: var(--ink-dim); font-size: 0.85rem; }
.login-card {
  background: var(--bg-card);
  border: 1px solid var(--line);
  border-top: 4px solid var(--teal);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  max-width: 26rem;
  margin: 0 auto;
  padding: 2.2rem 2rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1.1rem;
  text-align: center;
}
.google-btn-wrap { min-height: 44px; display: flex; justify-content: center; }
.login-note { color: var(--ink-faint); font-size: 0.85rem; }

@media (max-width: 640px) {
  .site-header { flex-direction: column; gap: 0.4rem; }
  .hero { padding-top: 3.6rem; }
  .lesson-feature { padding: 1.4rem 1.2rem; }
  .flip-card { height: 235px; }
}