:root {
  --bg-1: #102b3c;
  --bg-2: #1a5d78;
  --card: #fdfbf5;
  --card-soft: #f3fafc;
  --ink: #132734;
  --ink-soft: #3d5865;
  --accent: #ff8f42;
  --secondary: #2ea292;
  --focus: #1f94c0;
  --ok: #238b7a;
  --warn: #d35d42;
  --chip: #d9edf5;
  --border: #c6d8de;
  --radius: 18px;
  --shadow: 0 16px 36px rgba(6, 19, 29, 0.22);
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  min-height: 100%;
}

body {
  font-family: "Avenir Next", "Trebuchet MS", "Gill Sans", sans-serif;
  color: var(--ink);
  background:
    radial-gradient(circle at 12% 10%, #206983, transparent 35%),
    radial-gradient(circle at 85% 20%, #2a9d8f, transparent 32%),
    linear-gradient(160deg, var(--bg-1) 0%, #13384c 50%, var(--bg-2) 100%);
}

.app-shell {
  min-height: 100dvh;
  width: min(920px, 100%);
  margin: 0 auto;
  padding: 12px 12px calc(96px + env(safe-area-inset-bottom));
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.panel {
  border-radius: var(--radius);
  background: var(--card);
  box-shadow: var(--shadow);
  padding: 14px;
}

.app-top {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 10px;
}

.badge {
  display: inline-block;
  margin: 0;
  padding: 5px 10px;
  border-radius: 999px;
  background: #bfeaf4;
  color: #114a61;
  font-weight: 800;
  font-size: 0.79rem;
}

h1 {
  margin: 8px 0 4px;
  font-size: clamp(1.65rem, 5vw, 2.2rem);
}

.subtitle {
  margin: 0;
  color: var(--ink-soft);
}

.app-main {
  flex: 1;
  display: grid;
  gap: 12px;
}

.view {
  display: grid;
  gap: 12px;
  align-content: start;
}

.hero-card {
  background:
    linear-gradient(130deg, rgba(255, 143, 66, 0.1), rgba(46, 162, 146, 0.1)),
    var(--card-soft);
}

.hero-card h2 {
  margin: 6px 0;
  font-size: clamp(1.3rem, 4.5vw, 1.7rem);
}

.hero-card p {
  margin: 0;
  color: var(--ink-soft);
}

.profile-strip {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-top: 12px;
}

.level-badge,
.level-chip {
  display: inline-block;
  border-radius: 999px;
  font-weight: 900;
  line-height: 1;
}

.level-badge {
  background: #ffe6c7;
  color: #7a4e13;
  padding: 8px 11px;
  font-size: 0.9rem;
}

.level-chip {
  background: #d8edf6;
  color: #1a5167;
  padding: 8px 11px;
  font-size: 0.9rem;
}

.motivation-line {
  margin-top: 10px !important;
  font-weight: 700;
  color: #1f5d76 !important;
}

.eyebrow {
  margin: 0;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-size: 0.75rem;
  font-weight: 900;
  color: #1f5f79;
}

h2,
h3 {
  margin: 0 0 10px;
}

h3 {
  margin-top: 12px;
}

.segmented {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.seg-btn,
.primary-btn,
.secondary-btn,
.danger-btn,
.ghost-btn,
.option-btn,
.tab-btn {
  min-height: 48px;
  border-radius: 12px;
  border: 0;
  font-size: 1rem;
  font-weight: 800;
  padding: 11px 14px;
  line-height: 1;
  cursor: pointer;
  transition: transform 120ms ease, background-color 160ms ease, color 160ms ease;
}

.seg-btn {
  background: #d8e8ef;
  color: #1e4253;
}

.seg-btn.active {
  background: #217291;
  color: #f8fdff;
}

.primary-btn {
  background: var(--accent);
  color: #fffaf4;
}

.secondary-btn {
  background: var(--secondary);
  color: #f2fffb;
}

.danger-btn {
  background: #c84935;
  color: #fff7f4;
}

.ghost-btn {
  background: #edf4f6;
  color: #244757;
  border: 1px solid var(--border);
}

.option-btn {
  width: 100%;
  text-align: left;
  background: #edf4f7;
  color: #193545;
}

.option-btn.correct {
  background: #d6f4ee;
  color: #0f5d51;
}

.option-btn.wrong {
  background: #ffe3dc;
  color: #823123;
}

.seg-btn:active,
.primary-btn:active,
.secondary-btn:active,
.danger-btn:active,
.ghost-btn:active,
.option-btn:active,
.tab-btn:active {
  transform: scale(0.98);
}

button:focus-visible,
input:focus-visible,
select:focus-visible,
textarea:focus-visible,
summary:focus-visible {
  outline: 3px solid var(--focus);
  outline-offset: 2px;
}

label {
  display: grid;
  gap: 6px;
  color: var(--ink-soft);
  font-weight: 700;
}

input,
select,
textarea {
  width: 100%;
  min-height: 48px;
  border-radius: 12px;
  border: 1px solid #b8cbd2;
  padding: 10px 12px;
  font-size: 1rem;
  font-family: inherit;
  color: var(--ink);
  background: #fff;
}

textarea {
  min-height: 130px;
  resize: vertical;
}

.two-col {
  display: grid;
  gap: 10px;
  grid-template-columns: 1fr;
}

.action-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.mt-10 {
  margin-top: 10px;
}

.advanced-options {
  margin-top: 12px;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: #f4fbfd;
  padding: 8px 10px;
}

.advanced-options summary {
  cursor: pointer;
  font-weight: 800;
  color: #1c4f64;
}

.status-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
}

.status-row p {
  margin: 0;
  font-weight: 800;
}

.chips {
  display: flex;
  gap: 6px;
}

.chip {
  border-radius: 999px;
  background: var(--chip);
  color: #1a4b61;
  font-weight: 900;
  padding: 7px 11px;
  font-size: 0.95rem;
}

.play-panel {
  position: relative;
  overflow: hidden;
}

.xp-track {
  margin-bottom: 12px;
}

.xp-track-head {
  display: flex;
  justify-content: space-between;
  gap: 8px;
  align-items: center;
  flex-wrap: wrap;
}

.level-sub {
  font-size: 0.88rem;
  color: var(--ink-soft);
  font-weight: 700;
}

.xp-bar {
  margin-top: 7px;
  height: 10px;
  border-radius: 999px;
  background: #dcebf1;
  overflow: hidden;
}

.xp-bar span {
  display: block;
  width: 0%;
  height: 100%;
  border-radius: inherit;
  background: linear-gradient(90deg, #2ea292, #36b7a5);
  transition: width 260ms ease;
}

.question-card {
  margin-top: 10px;
  border: 2px dashed #f0c083;
  border-radius: 14px;
  padding: 14px;
  background: #fff8ea;
}

.question-label {
  margin: 0 0 8px;
  color: #7f5b1b;
  font-weight: 900;
}

.question-card h2 {
  margin: 0;
  font-size: clamp(1.4rem, 6vw, 2.1rem);
}

.hint {
  margin: 8px 0 0;
  border-radius: 10px;
  padding: 9px 11px;
  background: #d9efff;
  color: #13445d;
  font-weight: 700;
}

.answer-form,
.mc-options,
.learn-actions {
  display: grid;
  gap: 8px;
  margin-top: 10px;
}

.answer-buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.big-feedback {
  margin-top: 10px;
  border-radius: 14px;
  border: 2px solid #b7d4dd;
  background: #eef8fc;
  color: #18495f;
  padding: 13px 14px;
  text-align: center;
  font-weight: 900;
  font-size: 1.15rem;
  transform: translateY(8px);
  opacity: 0;
  transition: opacity 180ms ease, transform 180ms ease;
}

.big-feedback.show {
  opacity: 1;
  transform: translateY(0);
}

.big-feedback.ok {
  border-color: #9fd9c8;
  background: #e5f8f1;
  color: #0f5f50;
}

.big-feedback.err {
  border-color: #efb3a5;
  background: #fff1ee;
  color: #8a3527;
}

.spark-layer {
  position: absolute;
  inset: 0;
  pointer-events: none;
  overflow: hidden;
}

.spark {
  position: absolute;
  width: 10px;
  height: 10px;
  border-radius: 2px;
  background: #ffba58;
  top: 38%;
  left: 50%;
  opacity: 0;
  animation: spark-fly 700ms ease forwards;
}

.feedback {
  min-height: 24px;
  margin: 10px 0 0;
  font-weight: 900;
}

.feedback.ok {
  color: var(--ok);
}

.feedback.err {
  color: var(--warn);
}

.summary-grid {
  display: grid;
  gap: 8px;
  grid-template-columns: repeat(auto-fit, minmax(130px, 1fr));
  margin-bottom: 10px;
}

.stat-box {
  background: #edf4f6;
  border-radius: 12px;
  padding: 10px;
}

.stat-box p {
  margin: 0;
}

.stat-box .k {
  color: var(--ink-soft);
  font-size: 0.8rem;
  font-weight: 700;
}

.stat-box .v {
  font-size: 1.2rem;
  font-weight: 900;
}

.grade {
  margin: 0 0 10px;
  font-size: 1.15rem;
  font-weight: 900;
}

.mistake-list {
  margin: 0;
  padding-left: 18px;
}

.recent-list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 10px;
}

.recent-item {
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 10px;
  background: #fffef9;
}

.recent-item p {
  margin: 0;
}

.recent-head {
  font-weight: 900;
  margin-bottom: 4px !important;
}

.recent-sub {
  margin-top: 4px !important;
  color: var(--ink-soft);
  font-size: 0.9rem;
}

.ocr-details {
  margin: 10px 0;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: #f5fbfd;
  padding: 8px 10px;
}

.ocr-details summary {
  cursor: pointer;
  font-weight: 800;
  color: #1c4f64;
}

.settings-sep {
  margin: 16px 0 12px;
  border: 0;
  border-top: 1px dashed var(--border);
}

.tabbar {
  position: fixed;
  left: 50%;
  transform: translateX(-50%);
  bottom: 10px;
  width: min(920px, calc(100% - 16px));
  background: rgba(12, 35, 48, 0.92);
  backdrop-filter: blur(10px);
  border-radius: 16px;
  padding: 8px 8px calc(8px + env(safe-area-inset-bottom));
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 6px;
  z-index: 40;
}

.tab-btn {
  background: #16455b;
  color: #d9eff7;
}

.tab-btn.active {
  background: #ff8f42;
  color: #fffaf4;
}

.hidden {
  display: none !important;
}

@media (min-width: 860px) {
  .app-shell {
    padding: 16px 16px calc(96px + env(safe-area-inset-bottom));
  }

  .view[data-section-panel="start"] {
    grid-template-columns: 1fr 1fr;
    align-items: start;
  }

  .two-col {
    grid-template-columns: 1fr 1fr;
  }
}

@keyframes fade-up {
  from {
    opacity: 0;
    transform: translateY(6px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes spark-fly {
  0% {
    opacity: 0.95;
    transform: translate(0, 0) rotate(0deg) scale(1);
  }
  100% {
    opacity: 0;
    transform: translate(var(--dx), var(--dy)) rotate(110deg) scale(0.6);
  }
}