:root {
  --ink: #172033;
  --muted: #53627c;
  --paper: #fffaf0;
  --paper-2: #fff;
  --night: #101a35;
  --blue: #2563eb;
  --green: #16a34a;
  --gold: #f59e0b;
  --red: #dc2626;
  --line: rgba(23, 32, 51, .12);
  --shadow: 0 18px 46px rgba(6, 13, 33, .24);
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  min-height: 100%;
  font-family: "M PLUS Rounded 1c", "Yu Gothic", system-ui, sans-serif;
  color: var(--ink);
  background:
    linear-gradient(180deg, rgba(8, 18, 45, .22), rgba(8, 18, 45, .72)),
    radial-gradient(circle at 16% 12%, rgba(245, 158, 11, .28), transparent 24%),
    linear-gradient(160deg, #132451 0%, #1f4ea2 48%, #0f766e 100%);
}

button,
input {
  font: inherit;
}

button {
  border: 0;
  cursor: pointer;
}

.app {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 12px;
}

.screen {
  width: min(100%, 980px);
  min-height: min(680px, calc(100vh - 24px));
  display: grid;
  align-content: center;
  gap: 18px;
}

.home-shell {
  width: min(100%, 1240px);
}

.clear-shell {
  width: min(100%, 1240px);
}

.hero,
.game-card,
.result-card {
  border-radius: 8px;
  box-shadow: var(--shadow);
  overflow: hidden;
}

.hero,
.home-screen {
  --home-pad: clamp(18px, 4vw, 34px);
  position: relative;
  min-height: min(720px, calc(100vh - 36px));
  display: grid;
  grid-template-rows: auto 1fr auto;
  padding: var(--home-pad);
  color: #fff;
  background:
    linear-gradient(180deg, rgba(10, 17, 36, .2), rgba(10, 17, 36, .9)),
    linear-gradient(135deg, rgba(37, 99, 235, .78), rgba(15, 118, 110, .76)),
    url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 1200 760'%3E%3Crect width='1200' height='760' fill='%23101a35'/%3E%3Cg opacity='.34'%3E%3Cpath d='M120 124h960v510H120z' fill='%232a3e70'/%3E%3Cpath d='M170 176h130v390H170zm170 0h130v390H340zm170 0h130v390H510zm170 0h130v390H680zm170 0h130v390H850z' fill='%23f7d488'/%3E%3Cpath d='M170 230h810M170 310h810M170 390h810M170 470h810' stroke='%23101a35' stroke-width='18'/%3E%3C/g%3E%3Cpath d='M80 660h1040' stroke='%23f59e0b' stroke-width='20' opacity='.42'/%3E%3C/svg%3E") center/cover;
}

.home-screen {
  width: 100%;
  border-radius: 8px;
  box-shadow: var(--shadow);
  isolation: isolate;
  background:
    linear-gradient(90deg, rgba(4, 10, 28, .26) 0%, rgba(8, 22, 55, .08) 34%, rgba(8, 22, 55, 0) 60%),
    linear-gradient(180deg, rgba(5, 10, 25, 0) 58%, rgba(5, 10, 25, .46) 100%),
    url("./assets/home-survival-bg.png") center / cover no-repeat;
}

.home-screen::before {
  content: none;
}

.home-screen::after {
  content: none;
}

.home-top {
  display: flex;
  align-items: center;
  justify-content: flex-start;
  gap: 12px;
}

.home-tool-btn {
  width: 54px;
  height: 54px;
  display: inline-grid;
  place-items: center;
  padding: 0;
  border-radius: 50%;
  color: #fff;
  background: rgba(15, 23, 42, .56);
  box-shadow: inset 0 0 0 2px rgba(255, 255, 255, .2), 0 10px 24px rgba(15, 23, 42, .22);
  font-size: 28px;
  line-height: 1;
  font-weight: 1000;
  backdrop-filter: blur(8px);
}

.home-tool-btn:focus-visible {
  outline: 0;
  box-shadow: inset 0 0 0 2px rgba(255, 255, 255, .4), 0 0 0 4px rgba(96, 165, 250, .42);
}

.home-record {
  min-height: 50px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0 18px;
  border-radius: 999px;
  color: #fff;
  background: rgba(15, 23, 42, .46);
  box-shadow: inset 0 0 0 1px rgba(255, 255, 255, .14), 0 10px 24px rgba(15, 23, 42, .18);
  font-weight: 900;
  backdrop-filter: blur(8px);
}

.home-record strong {
  margin: 0 4px 0 8px;
  color: #fde68a;
  font-size: 28px;
  line-height: 1;
}

.home-complete-badge {
  position: absolute;
  top: clamp(18px, 3.2vw, 34px);
  right: clamp(18px, 3.2vw, 36px);
  z-index: 2;
  display: grid;
  grid-template-columns: auto 1fr;
  grid-template-areas:
    "star title"
    "star sub";
  align-items: center;
  column-gap: 10px;
  min-width: 230px;
  padding: 12px 16px 12px 13px;
  border-radius: 999px;
  color: #fff;
  background:
    linear-gradient(135deg, rgba(15, 23, 42, .68), rgba(88, 28, 135, .58)),
    linear-gradient(135deg, rgba(250, 204, 21, .4), rgba(249, 115, 22, .28));
  box-shadow:
    inset 0 0 0 1px rgba(255, 255, 255, .22),
    0 0 28px rgba(250, 204, 21, .34),
    0 14px 28px rgba(15, 23, 42, .28);
  backdrop-filter: blur(9px);
}

.home-complete-badge span {
  grid-area: star;
  display: grid;
  place-items: center;
  width: 54px;
  height: 54px;
  border-radius: 50%;
  color: #7c2d12;
  background: radial-gradient(circle at 32% 26%, #fff7ad, #facc15 48%, #f97316 100%);
  font-size: 34px;
  line-height: 1;
  text-shadow: 0 1px 0 rgba(255, 255, 255, .42);
  box-shadow: 0 7px 14px rgba(249, 115, 22, .34), inset 0 0 0 2px rgba(255, 255, 255, .34);
}

.home-complete-badge strong {
  grid-area: title;
  font-size: clamp(18px, 2vw, 24px);
  line-height: 1.05;
  font-weight: 1000;
  letter-spacing: 0;
}

.home-complete-badge small {
  grid-area: sub;
  color: #fde68a;
  font-size: 13px;
  font-weight: 900;
}

.home-center {
  align-self: center;
  position: relative;
  display: grid;
  gap: 12px;
  justify-items: start;
  align-content: center;
  width: min(54%, 700px);
  min-height: 320px;
  padding-left: 2px;
}

.home-center h1 {
  margin: 0;
  color: #fff;
  font-size: clamp(54px, 6.5vw, 88px);
  line-height: .98;
  letter-spacing: 0;
  font-weight: 900;
  white-space: nowrap;
  text-shadow: 0 5px 22px rgba(0, 0, 0, .42);
}

.home-center p {
  margin: 0;
  color: rgba(255, 255, 255, .9);
  font-size: clamp(28px, 3.4vw, 46px);
  font-weight: 900;
  text-shadow: 0 3px 16px rgba(0, 0, 0, .36);
}

.survival-visual {
  position: absolute;
  right: 18px;
  top: 50%;
  width: min(42%, 430px);
  aspect-ratio: 1;
  transform: translateY(-50%);
  border-radius: 50%;
  background:
    radial-gradient(circle, rgba(255, 255, 255, .22) 0 18%, transparent 19%),
    conic-gradient(from -30deg, #22c55e, #facc15 38%, #f97316 64%, #ef4444 82%, #22c55e 100%);
  box-shadow: 0 0 46px rgba(250, 204, 21, .28), inset 0 0 0 18px rgba(15, 23, 42, .52);
}

.survival-visual::before {
  content: "";
  position: absolute;
  inset: 34px;
  border-radius: 50%;
  background: radial-gradient(circle at 50% 44%, #fff7ed, #fde68a 46%, #f97316 100%);
  box-shadow: inset 0 -18px 34px rgba(154, 52, 18, .3), 0 12px 30px rgba(0, 0, 0, .2);
}

.timer-core {
  position: absolute;
  inset: 0;
  z-index: 2;
  display: grid;
  place-items: center;
  color: #172033;
  font-size: clamp(78px, 7vw, 118px);
  font-weight: 1000;
  line-height: 1;
  text-shadow: 0 3px 0 rgba(255, 255, 255, .42);
}

.slash-mark {
  position: absolute;
  right: 8%;
  bottom: 9%;
  z-index: 3;
  display: grid;
  place-items: center;
  width: 82px;
  height: 82px;
  border-radius: 50%;
  color: #fff;
  background: linear-gradient(135deg, #7c3aed, #2563eb);
  font-size: 58px;
  font-weight: 1000;
  box-shadow: 0 12px 28px rgba(37, 99, 235, .32);
}

.number-chip {
  position: absolute;
  z-index: 3;
  display: grid;
  place-items: center;
  min-width: 72px;
  height: 64px;
  padding: 0 14px;
  border-radius: 18px;
  color: #fff;
  background: rgba(15, 23, 42, .76);
  box-shadow: inset 0 0 0 1px rgba(255, 255, 255, .16), 0 14px 24px rgba(0, 0, 0, .24);
  font-size: 34px;
  font-weight: 1000;
  transform: rotate(var(--r, 0deg));
}

.number-chip.n1 {
  left: -24px;
  top: 54px;
  --r: -13deg;
}

.number-chip.n2 {
  right: -24px;
  top: 68px;
  --r: 10deg;
}

.number-chip.n3 {
  left: -8px;
  bottom: 70px;
  --r: 9deg;
}

.number-chip.n4 {
  right: 42px;
  bottom: -18px;
  --r: -10deg;
}

.home-bottom {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(300px, 430px);
  gap: 22px;
  align-items: center;
  justify-items: stretch;
  width: calc(100% + var(--home-pad) * 2);
  margin: 0 calc(var(--home-pad) * -1) calc(var(--home-pad) * -1);
  padding: 18px var(--home-pad) 20px;
  border-radius: 0 0 8px 8px;
  background:
    linear-gradient(90deg, rgba(3, 7, 18, .86), rgba(9, 28, 64, .68) 54%, rgba(3, 7, 18, .54));
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, .18);
  color: #fff;
  backdrop-filter: blur(10px);
}

.home-mission {
  display: grid;
  gap: 8px;
  justify-items: start;
  width: 100%;
  padding: 0;
  border-radius: 8px;
  color: #fff;
  background: transparent;
  box-shadow: none;
  backdrop-filter: none;
}

.home-mission span {
  padding: 0;
  color: #dbeafe;
  background: transparent;
  font-weight: 900;
  font-size: clamp(18px, 2.2vw, 28px);
  text-shadow: 0 3px 12px rgba(0, 0, 0, .32);
}

.home-mission b {
  margin: 0 5px;
  color: #fde68a;
  font-size: 1.35em;
  line-height: 1;
}

.home-mission strong {
  color: #fff;
  font-size: clamp(26px, 3.3vw, 40px);
  line-height: 1.2;
  text-shadow: 0 4px 16px rgba(0, 0, 0, .34);
}

.home-cta {
  width: 100%;
  min-height: 86px;
  border-radius: 28px;
  font-size: clamp(30px, 4vw, 44px);
}

.brand {
  display: inline-flex;
  width: fit-content;
  padding: 7px 12px;
  border-radius: 999px;
  color: #fde68a;
  background: rgba(8, 13, 28, .54);
  font-weight: 900;
  letter-spacing: 0;
}

.hero h1 {
  align-self: center;
  max-width: 760px;
  margin: 0;
  font-size: clamp(42px, 8vw, 82px);
  line-height: 1;
  font-weight: 900;
  letter-spacing: 0;
  text-shadow: 0 5px 22px rgba(0, 0, 0, .38);
}

.hero-bottom {
  display: grid;
  gap: 14px;
  width: min(100%, 520px);
}

.hero-lead {
  margin: 0;
  color: rgba(255, 255, 255, .9);
  font-size: clamp(16px, 2.4vw, 22px);
  line-height: 1.55;
  font-weight: 800;
}

.primary {
  min-height: 58px;
  border-radius: 8px;
  padding: 14px 22px;
  color: #fff;
  background: linear-gradient(135deg, var(--gold), #ef4444);
  font-size: clamp(20px, 3vw, 28px);
  font-weight: 900;
  box-shadow: 0 9px 0 #9a3412, 0 18px 34px rgba(154, 52, 18, .24);
}

.secondary {
  min-height: 46px;
  border-radius: 8px;
  padding: 10px 16px;
  color: #fff;
  background: rgba(255, 255, 255, .16);
  box-shadow: inset 0 0 0 1px rgba(255, 255, 255, .24);
  font-weight: 900;
}

.game-card,
.result-card {
  position: relative;
  background: linear-gradient(180deg, var(--paper), var(--paper-2));
}

.topbar {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  gap: 12px;
  align-items: center;
  padding: 10px 14px;
  color: #fff;
  background: linear-gradient(135deg, #172554, #2563eb 56%, #0f766e);
}

.stat {
  display: grid;
  gap: 2px;
  min-width: 90px;
}

.stat span {
  color: rgba(255, 255, 255, .72);
  font-size: 12px;
  font-weight: 900;
}

.stat strong {
  font-size: 24px;
  line-height: 1;
  font-weight: 900;
}

.timer-wrap {
  display: inline-grid;
  grid-template-columns: auto auto;
  align-items: baseline;
  justify-content: center;
  gap: 8px;
  min-width: 160px;
  padding: 8px 14px;
  border-radius: 999px;
  background: rgba(255, 255, 255, .13);
  box-shadow: inset 0 0 0 1px rgba(255, 255, 255, .16);
  color: #fff;
  font-weight: 900;
}

.timer-wrap span {
  color: rgba(255, 255, 255, .74);
  font-size: 12px;
}

.timer-wrap strong {
  font-size: 26px;
  line-height: 1;
  font-variant-numeric: tabular-nums;
}

.timer-wrap strong.timer-danger {
  color: #fecaca;
}

.timer-progress {
  position: relative;
  height: 34px;
  border-radius: 999px;
  overflow: hidden;
  background: rgba(15, 23, 42, .22);
  box-shadow:
    inset 0 0 0 3px rgba(255, 255, 255, .9),
    inset 0 0 0 6px rgba(15, 23, 42, .08),
    0 10px 22px rgba(15, 23, 42, .14);
}

.timer-progress::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(255, 255, 255, .42), rgba(255, 255, 255, 0) 48%, rgba(15, 23, 42, .1));
  pointer-events: none;
}

.timer-fill {
  --timer-hue: 132;
  width: 100%;
  height: 100%;
  border-radius: inherit;
  background:
    linear-gradient(180deg, rgba(255, 255, 255, .44), rgba(255, 255, 255, 0) 48%, rgba(15, 23, 42, .16)),
    hsl(var(--timer-hue) 96% 48%);
  box-shadow:
    0 0 26px hsl(var(--timer-hue) 96% 48% / .6),
    inset 0 -5px 12px rgba(15, 23, 42, .18);
  transform-origin: left center;
  transition: box-shadow .12s linear;
}

.timer-fill.timer-danger {
  background:
    linear-gradient(180deg, rgba(255, 255, 255, .34), rgba(255, 255, 255, 0) 48%, rgba(15, 23, 42, .18)),
    hsl(var(--timer-hue) 100% 50%);
  box-shadow:
    0 0 32px rgba(239, 68, 68, .76),
    0 0 18px rgba(249, 115, 22, .52),
    inset 0 -5px 12px rgba(127, 29, 29, .24);
}

.game-card.fx-hurry .timer-progress {
  animation: hurryTimerPulse .42s ease-in-out infinite alternate;
}

.game-card.fx-hurry .session-topbar {
  background: linear-gradient(135deg, #7f1d1d, #dc2626 54%, #f97316);
}

.game-card.fx-wrong-scene {
  animation: wrongSceneShake .38s cubic-bezier(.36, .07, .19, .97);
}

.game-card.fx-wrong-scene::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 2;
  pointer-events: none;
  background: rgba(239, 68, 68, .1);
  animation: wrongSceneTint .72s ease both;
}

.stage {
  display: inline-flex;
  justify-content: center;
  min-width: 132px;
  padding: 8px 12px;
  border-radius: 999px;
  color: #172033;
  background: #fde68a;
  font-weight: 900;
}

.question-area {
  display: grid;
  gap: 10px;
  justify-items: center;
  padding: clamp(18px, 3vw, 30px);
}

.question {
  position: relative;
  width: 100%;
  display: grid;
  gap: 8px;
  justify-items: center;
  padding: clamp(16px, 3vw, 30px);
  border-radius: 8px;
  background: #fff;
  overflow: hidden;
  box-shadow: inset 0 0 0 2px var(--line);
}

.question small {
  color: var(--muted);
  font-size: 14px;
  font-weight: 900;
}

.formula {
  position: relative;
  z-index: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  max-width: 100%;
  min-width: 0;
  gap: clamp(14px, 3vw, 28px);
  font-size: clamp(54px, 12vw, 112px);
  line-height: 1;
  font-weight: 900;
  letter-spacing: 0;
  white-space: nowrap;
}

.answer-form {
  width: min(100%, 640px);
  display: grid;
  gap: 10px;
}

.field {
  display: grid;
  gap: 6px;
}

.field label {
  color: var(--muted);
  font-size: 13px;
  font-weight: 900;
}

.answer-input {
  width: 100%;
  min-height: 60px;
  border: 3px solid #d6deef;
  border-radius: 8px;
  padding: 10px 14px;
  color: var(--ink);
  background: #fff;
  font-size: 38px;
  font-weight: 900;
  text-align: center;
}

.answer-input:focus {
  outline: 0;
  border-color: var(--blue);
  box-shadow: 0 0 0 4px rgba(37, 99, 235, .14);
}

.problem-board.fx-correct {
  animation: correctBoardPulse .62s cubic-bezier(.22, 1, .36, 1);
  box-shadow: inset 0 0 0 5px rgba(52, 211, 153, .2), 0 20px 52px rgba(52, 211, 153, .16);
}

.problem-board.fx-correct::after {
  content: "";
  position: absolute;
  inset: -12%;
  background: radial-gradient(circle, rgba(220, 255, 232, .3), rgba(74, 222, 128, .12) 34%, transparent 64%);
  pointer-events: none;
  animation: correctFlash .62s ease;
}

.problem-board.fx-wrong {
  animation: wrongBoardShake .46s cubic-bezier(.36, .07, .19, .97);
  box-shadow: inset 0 0 0 6px rgba(239, 68, 68, .14), 0 20px 52px rgba(239, 68, 68, .12);
}

.problem-board.fx-wrong::after {
  content: "";
  position: absolute;
  inset: 0;
  background: rgba(239, 68, 68, .08);
  pointer-events: none;
  animation: wrongFlash .72s ease both;
}

.problem-celebration-overlay {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  pointer-events: none;
  z-index: 3;
}

.problem-celebration-ring {
  width: min(94%, 650px);
  height: auto;
  overflow: visible;
  filter: drop-shadow(0 0 16px rgba(34, 197, 94, .2)) drop-shadow(0 7px 14px rgba(34, 197, 94, .22));
  animation: correctRingPop .48s cubic-bezier(.2, 1.1, .26, 1) both;
}

.problem-celebration-ring path {
  fill: none;
  stroke: #16c96b;
  stroke-width: 12.5;
  stroke-linecap: round;
  stroke-linejoin: round;
  stroke-dasharray: 100;
  stroke-dashoffset: 100;
  animation: correctRingDraw .46s cubic-bezier(.2, .82, .2, 1) both;
}

.keypad {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 6px;
}

.session-side .compact-keypad {
  height: 100%;
  grid-template-rows: repeat(4, minmax(0, 1fr));
}

.compact-keypad button {
  min-height: 42px;
  border-radius: 8px;
  background: linear-gradient(180deg, #fff, #eef2ff);
  color: var(--ink);
  box-shadow: 0 3px 0 #c7d2fe, 0 4px 12px rgba(99, 102, 241, .1);
  font-size: 22px;
  font-weight: 900;
}

.session-side .compact-keypad button {
  min-height: 0;
}

.compact-keypad button:active {
  transform: translateY(2px);
  box-shadow: 0 1px 0 #c7d2fe;
}

.compact-keypad button.special {
  font-size: 13px;
  background: linear-gradient(180deg, #f1f5f9, #e2e8f0);
  box-shadow: 0 3px 0 #cbd5e1;
}

.compact-keypad button.keypad-clear {
  color: #9a3412;
  background: linear-gradient(180deg, #fff7ed, #fed7aa);
}

.compact-keypad button.keypad-backspace {
  color: #1d4ed8;
  background: linear-gradient(180deg, #eff6ff, #dbeafe);
}

.submit {
  min-height: 76px;
  border-radius: 8px;
  color: #fff;
  background: linear-gradient(135deg, var(--blue), #0f766e);
  font-size: 28px;
  font-weight: 900;
}

.hint {
  min-height: 24px;
  margin: 0;
  color: var(--muted);
  font-size: 15px;
  line-height: 1.45;
  font-weight: 800;
  text-align: center;
}

.feedback {
  min-height: 0;
  color: var(--green);
  font-size: 22px;
  font-weight: 900;
}

.feedback.bad {
  color: var(--red);
}

.session-card {
  width: 100%;
  height: min(680px, calc(100vh - 24px));
  display: grid;
  grid-template-rows: auto auto minmax(0, 1fr);
  gap: 10px;
  padding: 14px;
  border-radius: 8px;
  background: linear-gradient(170deg, #faf8ff 0%, #fff 40%, #fffbeb 100%);
  box-shadow: var(--shadow);
  overflow: hidden;
}

.session-topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.session-topbar-left,
.session-topbar-right {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

.session-topbar-right {
  justify-content: flex-end;
}

.session-counter,
.session-best,
.session-collect-chip {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 34px;
  padding: 7px 12px;
  border-radius: 999px;
  font-size: 13px;
  font-weight: 900;
  color: #4338ca;
  background: #eef2ff;
  box-shadow: inset 0 0 0 1px rgba(99, 102, 241, .16);
}

.session-counter {
  color: #fff;
  background: linear-gradient(135deg, #7c3aed, #2563eb);
  box-shadow: 0 8px 20px rgba(59, 130, 246, .16);
}

.session-best {
  color: #475569;
  background: #f8fafc;
}

.session-collect-chip {
  gap: 5px;
  color: #7c2d12;
  background: linear-gradient(160deg, #fff7ed, #fffbeb, #fef3c7);
  box-shadow: inset 0 0 0 2px rgba(245, 158, 11, .12);
}

.session-collect-chip span {
  font-size: 12px;
  color: #9a3412;
}

.session-collect-chip strong {
  min-width: 42px;
  color: #0f172a;
  font-size: 24px;
  line-height: 1;
  font-variant-numeric: tabular-nums;
}

.session-collect-chip strong.timer-danger {
  color: #dc2626;
}

.session-main {
  min-height: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(280px, .72fr);
  gap: 12px;
  align-items: stretch;
  padding: 0;
}

.session-main.question-area {
  justify-items: stretch;
}

.session-side {
  min-height: 0;
  display: grid;
  align-content: stretch;
  gap: 10px;
  padding: 12px;
  border-radius: 8px;
  background: rgba(255, 255, 255, .64);
  box-shadow: inset 0 0 0 2px rgba(199, 210, 254, .28);
}

.session-side .answer-form {
  width: 100%;
  height: 100%;
  grid-template-rows: auto minmax(0, 1fr) auto;
  gap: 10px;
}

.session-main .problem-board {
  min-height: 100%;
  align-content: center;
  padding: 24px 18px;
  border-radius: 8px;
  background:
    radial-gradient(circle at 72% 16%, rgba(245, 158, 11, .1), transparent 28%),
    linear-gradient(180deg, #fff, #eef4ff);
  box-shadow: inset 0 0 0 2px rgba(99, 102, 241, .1), 0 14px 28px rgba(15, 23, 42, .08);
}

.session-main .problem-text {
  font-size: clamp(84px, 9vw, 134px);
  font-weight: 1000;
  color: #1e1b4b;
  letter-spacing: 0;
}

.session-main .problem-text-wide {
  gap: clamp(8px, 1.8vw, 18px);
  font-size: clamp(68px, 7.4vw, 108px);
}

.session-main .problem-text span {
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.session-main .problem-text span:not(:nth-child(2)) {
  background: linear-gradient(135deg, #1e1b4b, #4338ca, #1d4ed8);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  -webkit-text-stroke: 1px rgba(30, 27, 75, .18);
}

.answer-box-wrap {
  gap: 6px;
}

.remainder-answer-wrap {
  gap: 8px;
}

.remainder-fields {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto minmax(78px, .72fr);
  gap: 8px;
  align-items: end;
}

.answer-field {
  display: grid;
  gap: 5px;
}

.answer-field span,
.answer-separator {
  color: var(--muted);
  font-size: 13px;
  font-weight: 900;
}

.answer-separator {
  align-self: center;
  padding-top: 21px;
  color: #7c2d12;
  white-space: nowrap;
}

.answer-box {
  min-height: 72px;
  border: 3px solid rgba(99, 102, 241, .26);
  border-radius: 14px;
  background: linear-gradient(180deg, #fff, #f8fbff);
  box-shadow: inset 0 0 0 2px rgba(255, 255, 255, .88), 0 10px 20px rgba(99, 102, 241, .1);
  font-size: 40px;
}

.remainder-fields .answer-box {
  min-height: 70px;
  padding-inline: 8px;
}

.answer-box:focus {
  border-color: #7c3aed;
  box-shadow: 0 0 0 4px rgba(124, 58, 237, .14), inset 0 0 0 2px rgba(255, 255, 255, .88);
}

.answer-form.fx-wrong .answer-box {
  border-color: #fb923c;
  animation: wrongInputShake .42s cubic-bezier(.36, .07, .19, .97);
  box-shadow: 0 0 0 5px rgba(251, 146, 60, .14), inset 0 0 0 2px rgba(255, 255, 255, .88);
}

.answer-form.fx-wrong {
  align-content: start;
  grid-template-rows: auto minmax(0, 1fr);
}

.answer-form.fx-wrong .compact-keypad,
.answer-form.fx-wrong .sticky-submit {
  display: none;
}

.answer-box::placeholder {
  color: #0f172a;
  opacity: .58;
  font-size: 40px;
  font-weight: 900;
}

.feedback-slot {
  min-height: 48px;
}

.feedback-slot:empty {
  display: none;
}

.feedback {
  width: 100%;
  padding: 10px 12px;
  border-radius: 14px;
  font-weight: 900;
  line-height: 1.35;
  animation: feedbackPop .42s cubic-bezier(.19, 1, .22, 1);
}

.feedback.correct {
  color: #166534;
  background: linear-gradient(135deg, #ecfdf5, #86efac);
  box-shadow: 0 10px 24px rgba(43, 191, 108, .18);
}

.feedback.incorrect {
  color: #7f1d1d;
  background: linear-gradient(135deg, #fecaca, #ef4444);
  box-shadow: 0 12px 28px rgba(239, 68, 68, .28);
}

.answer-reveal {
  display: grid;
  align-content: stretch;
  gap: 8px;
  justify-items: stretch;
  min-height: 100%;
  padding: 10px;
  border-radius: 14px;
  color: var(--ink);
  background: #fff;
  box-shadow: 0 14px 28px rgba(15, 23, 42, .1), inset 0 0 0 2px rgba(199, 210, 254, .34);
  animation: answerPop .48s cubic-bezier(.18, 1.24, .3, 1) both;
}

.wrong-result-summary {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 8px;
}

.wrong-result-summary > div {
  display: grid;
  align-content: center;
  gap: 2px;
  min-height: 46px;
  padding: 7px 10px;
  border-radius: 12px;
  color: #fff;
  background: linear-gradient(135deg, #7c3aed, #2563eb);
  box-shadow: 0 7px 0 #3730a3, 0 12px 20px rgba(59, 130, 246, .2);
}

.wrong-result-summary span {
  font-size: 14px;
  font-weight: 1000;
}

.wrong-result-summary strong {
  display: inline-flex;
  align-items: baseline;
  gap: 2px;
  font-size: clamp(28px, 3.6vw, 42px);
  line-height: .95;
  font-weight: 1000;
}

.wrong-result-summary small {
  font-size: .48em;
}

.wrong-answer-note {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  align-items: center;
  gap: 8px;
  min-height: 46px;
  padding: 7px 10px;
  border-radius: 12px;
  color: #7c2d12;
  background: #fff7ed;
  box-shadow: inset 0 0 0 2px rgba(251, 146, 60, .18);
}

.wrong-answer-note span {
  color: #9a3412;
  font-size: 13px;
  font-weight: 900;
}

.wrong-answer-note strong {
  min-width: 0;
  color: #7c2d12;
  font-size: clamp(22px, 2.6vw, 34px);
  line-height: 1;
  font-weight: 1000;
  text-align: right;
  white-space: nowrap;
}

.correct-answer-card {
  display: grid;
  align-content: center;
  gap: 9px;
  min-height: 0;
  padding: clamp(12px, 2vw, 18px);
  border-radius: 14px;
  background: linear-gradient(180deg, #fff, #f8fafc);
  box-shadow: inset 0 0 0 2px rgba(59, 130, 246, .12);
}

.correct-answer-card span {
  justify-self: center;
  padding: 5px 14px;
  border-radius: 999px;
  color: #1e3a8a;
  background: #dbeafe;
  font-size: clamp(16px, 2vw, 22px);
  font-weight: 1000;
}

.correct-answer-card strong {
  color: #1e1b4b;
  font-size: clamp(36px, 4.5vw, 58px);
  line-height: 1;
  font-weight: 1000;
  text-align: center;
  white-space: nowrap;
  text-shadow: 0 4px 0 rgba(255, 255, 255, .72), 0 10px 22px rgba(37, 99, 235, .12);
}

.wrong-result-actions {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 9px;
  align-self: end;
}

.reveal-retry,
.reveal-home {
  align-self: end;
  min-height: 56px;
  border-radius: 12px;
  padding: 10px 12px;
  font-size: clamp(18px, 2.4vw, 24px);
}

.reveal-retry {
  box-shadow: 0 6px 0 #9a3412, 0 14px 26px rgba(249, 115, 22, .24);
}

.reveal-home {
  color: #fff;
  background: linear-gradient(135deg, #1d4ed8, #0f766e);
  box-shadow: 0 6px 0 #0f3b72, 0 14px 26px rgba(37, 99, 235, .22);
}

.answer-form input:disabled,
.answer-form button:disabled {
  cursor: default;
  opacity: .58;
}

.compact-feedback {
  font-size: 16px;
}

.sticky-submit {
  display: grid;
}

.button-accent {
  background: linear-gradient(135deg, #f59e0b, #f97316, #ef4444);
  box-shadow: 0 8px 0 #c2410c, 0 16px 36px rgba(249, 115, 22, .36);
}

.result-card {
  display: grid;
  gap: 18px;
  padding: clamp(20px, 5vw, 42px);
  text-align: center;
}

.result-card h2 {
  margin: 0;
  font-size: clamp(34px, 7vw, 68px);
  line-height: 1.05;
  font-weight: 900;
}

.result-shell {
  width: min(100%, 1120px);
}

.result-card.result-timeout,
.result-card.result-stop {
  min-height: min(690px, calc(100vh - 24px));
  align-content: center;
  gap: clamp(14px, 2.3vw, 22px);
  overflow: hidden;
  background:
    linear-gradient(180deg, rgba(255, 255, 255, .94), rgba(255, 250, 240, .98)),
    repeating-linear-gradient(135deg, rgba(239, 68, 68, .12) 0 10px, rgba(245, 158, 11, .1) 10px 20px);
}

.result-card.result-timeout {
  box-shadow: 0 18px 46px rgba(127, 29, 29, .28);
}

.timeout-burst {
  position: absolute;
  inset: 0;
  pointer-events: none;
  overflow: hidden;
}

.timeout-burst span {
  position: absolute;
  width: 180px;
  height: 180px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(239, 68, 68, .2), transparent 64%);
}

.timeout-burst span:nth-child(1) {
  top: -54px;
  left: 8%;
}

.timeout-burst span:nth-child(2) {
  right: -42px;
  top: 18%;
  width: 260px;
  height: 260px;
  background: radial-gradient(circle, rgba(245, 158, 11, .2), transparent 66%);
}

.timeout-burst span:nth-child(3) {
  left: 52%;
  bottom: -96px;
  width: 300px;
  height: 300px;
  background: radial-gradient(circle, rgba(37, 99, 235, .12), transparent 68%);
}

.result-hero {
  position: relative;
  display: grid;
  justify-items: center;
  gap: 10px;
}

.result-hero .brand {
  color: #fff7ed;
  background: linear-gradient(135deg, #991b1b, #ef4444 58%, #f97316);
  box-shadow: 0 8px 18px rgba(185, 28, 28, .22);
}

.result-hero h2 {
  color: #7f1d1d;
  font-size: clamp(52px, 9vw, 104px);
  text-shadow: 0 5px 0 rgba(254, 226, 226, .9);
}

.result-lead {
  width: min(100%, 760px);
  margin: 0;
  color: #172033;
  font-size: clamp(18px, 2.4vw, 30px);
  line-height: 1.45;
  font-weight: 900;
}

.result-score-grid {
  position: relative;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 220px));
  justify-content: center;
  gap: 12px;
}

.result-score-card {
  display: grid;
  gap: 2px;
  padding: 12px 16px;
  border-radius: 8px;
  background: #fff;
  box-shadow: inset 0 0 0 2px rgba(23, 32, 51, .1), 0 12px 26px rgba(23, 32, 51, .1);
}

.result-score-card span {
  color: var(--muted);
  font-size: 14px;
  font-weight: 900;
}

.result-score-card strong {
  font-size: clamp(36px, 5vw, 58px);
  line-height: .95;
  font-weight: 1000;
}

.result-score-card small {
  margin-left: 2px;
  font-size: .45em;
}

.primary-score {
  color: #fff;
  background: linear-gradient(135deg, #1d4ed8, #0891b2);
  box-shadow: 0 10px 0 #075985, 0 18px 30px rgba(8, 145, 178, .24);
}

.primary-score span {
  color: rgba(255, 255, 255, .82);
}

.result-review {
  position: relative;
  display: grid;
  grid-template-columns: 1fr 1fr 1.1fr;
  gap: 10px;
  padding: clamp(12px, 2vw, 18px);
  border-radius: 8px;
  background: #fff;
  box-shadow: inset 0 0 0 2px rgba(23, 32, 51, .12), 0 16px 30px rgba(23, 32, 51, .12);
  text-align: left;
}

.result-review > div {
  display: grid;
  align-content: center;
  gap: 6px;
  min-height: 88px;
  padding: 12px;
  border-radius: 8px;
  background: #f8fafc;
}

.result-review span {
  color: var(--muted);
  font-size: 13px;
  font-weight: 900;
}

.result-review strong {
  color: var(--ink);
  font-size: clamp(22px, 3vw, 36px);
  line-height: 1.1;
  font-weight: 1000;
}

.result-review .result-correct {
  background: linear-gradient(135deg, #ecfdf5, #dcfce7);
  box-shadow: inset 0 0 0 2px rgba(22, 163, 74, .18);
}

.result-review .result-correct span {
  color: #166534;
}

.result-review .result-correct strong {
  color: #166534;
}

.result-review p {
  grid-column: 1 / -1;
  margin: 0;
  padding: 12px 14px;
  border-radius: 8px;
  color: #334155;
  background: #fff7ed;
  line-height: 1.55;
  font-weight: 900;
}

.result-tip {
  position: relative;
  width: min(100%, 760px);
  margin: 0 auto;
  color: #475569;
  font-size: clamp(15px, 2vw, 20px);
  line-height: 1.5;
  font-weight: 900;
}

.clear-screen {
  --clear-pad: clamp(22px, 4vw, 46px);
  position: relative;
  min-height: min(720px, calc(100vh - 36px));
  display: grid;
  grid-template-rows: 1fr auto;
  align-items: stretch;
  padding: var(--clear-pad);
  border-radius: 8px;
  overflow: hidden;
  color: #fff;
  background:
    linear-gradient(90deg, rgba(5, 10, 30, .76) 0%, rgba(5, 10, 30, .48) 38%, rgba(5, 10, 30, .08) 68%),
    linear-gradient(180deg, rgba(5, 10, 30, .06) 50%, rgba(5, 10, 30, .62) 100%),
    url("./assets/clear-100-bg.png") center / cover no-repeat;
  box-shadow: var(--shadow);
}

.clear-content {
  display: grid;
  align-content: center;
  justify-items: start;
  gap: 16px;
  width: min(56%, 680px);
  min-height: 430px;
}

.clear-content h2 {
  margin: 0;
  font-size: clamp(68px, 9vw, 126px);
  line-height: .95;
  font-weight: 1000;
  letter-spacing: 0;
  text-shadow: 0 8px 28px rgba(0, 0, 0, .42);
}

.clear-content p {
  margin: 0;
  color: rgba(255, 255, 255, .94);
  font-size: clamp(24px, 3.2vw, 42px);
  font-weight: 900;
  text-shadow: 0 5px 18px rgba(0, 0, 0, .38);
}

.clear-stats {
  display: inline-grid;
  grid-template-columns: auto auto;
  align-items: baseline;
  gap: 12px;
  padding: 12px 18px;
  border-radius: 999px;
  background: rgba(3, 7, 18, .62);
  box-shadow: inset 0 0 0 1px rgba(255, 255, 255, .16);
  backdrop-filter: blur(8px);
}

.clear-stats span {
  color: #dbeafe;
  font-size: 18px;
  font-weight: 900;
}

.clear-stats strong {
  color: #fde68a;
  font-size: clamp(34px, 4vw, 58px);
  line-height: 1;
  font-weight: 1000;
}

.clear-actions {
  display: grid;
  grid-template-columns: minmax(260px, 420px) minmax(200px, 300px);
  justify-content: end;
  gap: 14px;
  width: 100%;
}

.clear-primary,
.clear-ghost {
  min-height: 76px;
  border-radius: 22px;
}

.clear-ghost {
  color: #fff;
  background: rgba(15, 23, 42, .66);
  box-shadow: inset 0 0 0 1px rgba(255, 255, 255, .16);
  backdrop-filter: blur(8px);
}

.score-line {
  margin: 0;
  font-size: clamp(22px, 4vw, 38px);
  font-weight: 900;
}

.review {
  display: grid;
  gap: 8px;
  padding: 14px;
  border-radius: 8px;
  background: #fff;
  box-shadow: inset 0 0 0 2px var(--line);
  text-align: left;
}

.review strong {
  font-size: 18px;
}

.review span {
  color: var(--muted);
  line-height: 1.55;
  font-weight: 800;
}

.howto-panel {
  gap: 10px;
}

.howto-panel span {
  position: relative;
  padding-left: 1.35em;
}

.howto-panel span::before {
  content: "";
  position: absolute;
  left: .2em;
  top: .72em;
  width: .55em;
  height: .55em;
  border-radius: 50%;
  background: linear-gradient(135deg, #f59e0b, #ef4444);
}

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

.ghost {
  min-height: 54px;
  border-radius: 8px;
  padding: 12px 18px;
  color: var(--ink);
  background: #eaf1ff;
  font-weight: 900;
}

.result-card.result-timeout .actions .ghost,
.result-card.result-stop .actions .ghost {
  color: #fff;
  background: linear-gradient(135deg, #2563eb, #0f766e);
  box-shadow: 0 9px 0 #0f3b72, 0 18px 34px rgba(37, 99, 235, .24);
}

.answer-reveal .reveal-home {
  color: #fff;
  background: linear-gradient(135deg, #1d4ed8, #0f766e);
  box-shadow: 0 6px 0 #0f3b72, 0 14px 26px rgba(37, 99, 235, .22);
}

@media (max-height: 680px) {
  .howto-screen {
    min-height: calc(100vh - 24px);
    align-content: center;
  }

  .howto-card {
    gap: 10px;
    padding: 14px;
  }

  .howto-card h2 {
    font-size: clamp(30px, 8vw, 52px);
  }

  .howto-card .brand {
    padding: 6px 12px;
    font-size: 13px;
  }

  .howto-panel {
    gap: 7px;
    padding: 10px;
  }

  .howto-panel strong {
    font-size: 16px;
  }

  .howto-panel span {
    line-height: 1.35;
    font-size: 14px;
  }

  .howto-card .actions {
    gap: 8px;
  }

  .howto-card .primary,
  .howto-card .ghost {
    min-height: 46px;
    padding: 8px 12px;
    font-size: 18px;
  }
}

@media (max-width: 760px) {
  .app {
    padding: 0;
  }

  .screen,
  .hero {
    width: 100%;
    min-height: 100vh;
    border-radius: 0;
  }

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

  .home-shell {
    width: 100%;
  }

  .home-screen {
    min-height: 100vh;
    border-radius: 0;
    grid-template-rows: auto minmax(270px, 1fr) auto;
    background-position: center top;
  }

  .home-tool-btn {
    width: 52px;
    height: 52px;
  }

  .home-center {
    width: 100%;
    min-height: 0;
    align-self: center;
    justify-items: start;
  }

  .home-center h1 {
    max-width: 100%;
    font-size: clamp(34px, 9.8vw, 48px);
    line-height: 1.05;
    white-space: nowrap;
  }

  .home-bottom {
    grid-template-columns: 1fr;
    gap: 14px;
    align-items: stretch;
  }

  .home-mission {
    justify-items: start;
  }

  .home-mission strong {
    font-size: clamp(25px, 7vw, 34px);
  }

  .home-mission span {
    font-size: clamp(16px, 4.6vw, 22px);
  }

  .home-cta {
    min-height: 72px;
    border-radius: 18px;
    font-size: clamp(26px, 7vw, 34px);
  }

  .home-complete-badge {
    top: 12px;
    right: 12px;
    min-width: 0;
    padding: 9px 12px 9px 9px;
  }

  .home-complete-badge span {
    width: 42px;
    height: 42px;
    font-size: 27px;
  }

  .home-complete-badge strong {
    font-size: 16px;
  }

  .clear-actions {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    justify-content: stretch;
    gap: 10px;
  }

  .clear-primary,
  .clear-ghost {
    width: 100%;
    min-height: 60px;
    border-radius: 18px;
    padding: 10px 8px;
    font-size: clamp(16px, 5vw, 22px);
  }

  .session-card {
    height: 100vh;
    min-height: 0;
    border-radius: 0;
    padding: 8px;
    gap: 7px;
    overflow: hidden;
  }

  .session-topbar {
    align-items: start;
  }

  .session-topbar-left,
  .session-topbar-right {
    align-items: center;
    gap: 6px;
  }

  .session-counter,
  .session-best,
  .session-collect-chip {
    min-height: 30px;
    padding: 5px 9px;
    font-size: 12px;
  }

  .session-collect-chip strong {
    min-width: 38px;
    font-size: 22px;
  }

  .timer-progress {
    height: 24px;
  }

  .session-main {
    grid-template-columns: 1fr;
    grid-template-rows: minmax(96px, .34fr) minmax(0, 1fr);
    gap: 8px;
    min-height: 0;
  }

  .session-main .problem-board {
    min-height: 0;
    padding: 8px;
  }

  .session-main .problem-text {
    gap: clamp(8px, 2vw, 14px);
    font-size: clamp(42px, 13vw, 72px);
  }

  .session-main .problem-text-wide {
    gap: clamp(5px, 1.4vw, 9px);
    font-size: clamp(34px, 10.5vw, 56px);
  }

  .session-side {
    min-height: 0;
    padding: 8px;
  }

  .session-side .answer-form {
    position: relative;
    height: 100%;
    min-height: 0;
    grid-template-rows: auto minmax(0, 1fr) auto;
    gap: 7px;
  }

  .session-side .compact-keypad {
    height: 100%;
    min-height: 0;
    grid-template-rows: repeat(4, minmax(0, 1fr));
  }

  .compact-keypad button {
    min-height: 0;
  }

  .submit {
    min-height: 50px;
    font-size: clamp(21px, 6.5vw, 28px);
  }

  .answer-box {
    min-height: 48px;
    font-size: 30px;
  }

  .remainder-fields .answer-box {
    min-height: 48px;
  }

  .feedback-slot {
    position: absolute;
    left: 0;
    right: 0;
    bottom: 58px;
    z-index: 5;
    min-height: 0;
    pointer-events: none;
  }

  .compact-feedback {
    padding: 7px 10px;
    border-radius: 12px;
    font-size: 14px;
  }

  .answer-form.fx-wrong .feedback-slot {
    position: static;
    pointer-events: auto;
  }

  .answer-reveal {
    min-height: 0;
    padding: 8px;
    gap: 7px;
  }

  .answer-form.fx-wrong {
    grid-template-rows: minmax(0, 1fr);
  }

  .answer-form.fx-wrong .answer-box-wrap {
    display: none;
  }

  .wrong-result-summary {
    gap: 7px;
  }

  .wrong-result-summary > div,
  .wrong-answer-note {
    min-height: 40px;
    padding: 6px 8px;
  }

  .wrong-result-summary span,
  .wrong-answer-note span {
    font-size: 12px;
  }

  .wrong-result-summary strong {
    font-size: clamp(24px, 7vw, 34px);
  }

  .wrong-answer-note strong {
    font-size: clamp(20px, 6vw, 28px);
  }

  .correct-answer-card {
    gap: 6px;
    padding: 10px;
  }

  .correct-answer-card span {
    padding: 4px 12px;
    font-size: 15px;
  }

  .correct-answer-card strong {
    font-size: clamp(32px, 8vw, 48px);
  }

  .wrong-result-actions {
    gap: 7px;
  }

  .reveal-retry,
  .reveal-home {
    min-height: 50px;
    padding: 8px;
    font-size: clamp(16px, 4.8vw, 20px);
  }

  .timer-wrap {
    min-width: 0;
  }

  .stage {
    min-width: 0;
  }

  .question-area {
    padding: 14px;
  }

  .formula {
    font-size: clamp(46px, 18vw, 72px);
  }

  .answer-input {
    min-height: 62px;
    font-size: 32px;
  }

  .result-card.result-timeout,
  .result-card.result-stop {
    min-height: 100vh;
    border-radius: 0;
    padding: 18px;
  }

  .result-hero h2 {
    font-size: clamp(44px, 15vw, 72px);
  }

  .result-score-grid {
    grid-template-columns: 1fr 1fr;
  }

  .result-score-card {
    padding: 10px;
  }

  .result-review {
    grid-template-columns: 1fr;
  }

  .result-review p {
    grid-column: auto;
  }

  .result-card .actions {
    display: grid;
    grid-template-columns: 1fr;
  }

  .howto-screen {
    min-height: 100vh;
  }
}

@media (max-height: 680px) {
  .result-card.result-timeout,
  .result-card.result-stop {
    height: calc(100vh - 24px);
    min-height: 0;
    gap: 8px;
    padding: 10px 18px;
    overflow: hidden;
  }

  .result-hero {
    gap: 5px;
  }

  .result-hero .brand {
    padding: 5px 10px;
    font-size: 13px;
  }

  .result-hero h2 {
    font-size: clamp(38px, 9vw, 62px);
    text-shadow: 0 3px 0 rgba(254, 226, 226, .9);
  }

  .result-lead {
    font-size: clamp(16px, 3vw, 22px);
    line-height: 1.25;
  }

  .result-score-grid {
    gap: 8px;
  }

  .result-score-card {
    padding: 7px 10px;
  }

  .result-score-card span {
    font-size: 12px;
  }

  .result-score-card strong {
    font-size: clamp(30px, 5vw, 42px);
  }

  .result-review {
    gap: 6px;
    padding: 8px;
  }

  .result-review > div {
    min-height: 46px;
    padding: 7px 10px;
    gap: 3px;
  }

  .result-review span {
    font-size: 12px;
  }

  .result-review strong {
    font-size: clamp(20px, 4vw, 28px);
  }

  .result-review p {
    padding: 8px 10px;
    line-height: 1.35;
    font-size: 14px;
  }

  .result-card .actions {
    gap: 8px;
  }

  .result-card .primary,
  .result-card .ghost {
    min-height: 48px;
    padding: 8px 12px;
    font-size: 18px;
  }

  .answer-form.fx-wrong {
    grid-template-rows: minmax(0, 1fr);
  }

  .answer-form.fx-wrong .answer-box-wrap {
    display: none;
  }

  .answer-reveal {
    gap: 7px;
    padding: 8px;
  }

  .wrong-result-summary > div,
  .wrong-answer-note {
    min-height: 40px;
    padding: 6px 8px;
  }

  .correct-answer-card {
    gap: 6px;
    padding: 10px;
  }

  .correct-answer-card strong {
    font-size: clamp(32px, 4vw, 48px);
  }

  .reveal-retry,
  .reveal-home {
    min-height: 50px;
    padding: 8px;
    font-size: clamp(16px, 2vw, 20px);
  }

  .clear-screen {
    --clear-pad: 18px;
    min-height: calc(100vh - 24px);
    grid-template-rows: minmax(0, 1fr) auto;
  }

  .clear-content {
    min-height: 0;
    gap: 10px;
  }

  .clear-content h2 {
    font-size: clamp(56px, 8vw, 88px);
  }

  .clear-content p {
    font-size: clamp(20px, 3vw, 30px);
  }

  .clear-stats {
    padding: 9px 14px;
  }

  .clear-actions {
    gap: 10px;
  }

  .clear-primary,
  .clear-ghost {
    min-height: 58px;
    border-radius: 18px;
  }
}

@media (max-width: 760px) and (max-height: 700px) {
  .result-card.result-timeout,
  .result-card.result-stop {
    height: 100vh;
    min-height: 0;
    gap: 8px;
    padding: 10px 12px;
    overflow: hidden;
  }

  .result-hero {
    gap: 5px;
  }

  .result-hero .brand {
    padding: 5px 10px;
    font-size: 13px;
  }

  .result-hero h2 {
    font-size: clamp(38px, 13vw, 50px);
    text-shadow: 0 3px 0 rgba(254, 226, 226, .9);
  }

  .result-lead {
    font-size: clamp(16px, 5vw, 20px);
    line-height: 1.25;
  }

  .result-score-grid {
    gap: 8px;
  }

  .result-score-card {
    padding: 7px 9px;
  }

  .result-score-card span {
    font-size: 12px;
  }

  .result-score-card strong {
    font-size: clamp(30px, 10vw, 42px);
  }

  .result-review {
    gap: 6px;
    padding: 8px;
  }

  .result-review > div {
    min-height: 46px;
    padding: 7px 10px;
    gap: 3px;
  }

  .result-review span {
    font-size: 12px;
  }

  .result-review strong {
    font-size: clamp(20px, 7vw, 28px);
  }

  .result-review p {
    padding: 8px 10px;
    line-height: 1.35;
    font-size: 14px;
  }

  .result-card .actions {
    gap: 8px;
  }

  .result-card .primary,
  .result-card .ghost {
    min-height: 48px;
    padding: 8px 12px;
    font-size: 18px;
  }
}

@media (max-width: 360px) and (max-height: 600px) {
  .session-card {
    padding: 6px;
    gap: 5px;
  }

  .session-counter,
  .session-best,
  .session-collect-chip {
    min-height: 28px;
    padding: 4px 8px;
    font-size: 11px;
  }

  .session-collect-chip strong {
    min-width: 34px;
    font-size: 20px;
  }

  .timer-progress {
    height: 20px;
  }

  .session-main {
    grid-template-rows: minmax(82px, .28fr) minmax(0, 1fr);
    gap: 6px;
  }

  .session-main .problem-board {
    padding: 6px;
  }

  .session-main .problem-text {
    font-size: clamp(38px, 13vw, 58px);
  }

  .session-main .problem-text-wide {
    gap: 4px;
    font-size: clamp(31px, 9.8vw, 44px);
  }

  .session-side {
    padding: 6px;
  }

  .session-side .answer-form {
    gap: 5px;
  }

  .answer-box {
    min-height: 44px;
    font-size: 26px;
  }

  .answer-box::placeholder {
    font-size: 28px;
  }

  .submit {
    min-height: 46px;
    font-size: 21px;
  }

  .feedback-slot {
    bottom: 52px;
  }

  .compact-feedback {
    padding: 5px 8px;
    font-size: 13px;
  }
}

@keyframes correctBoardPulse {
  0% { transform: scale(.98); }
  22% { transform: scale(1.02); }
  50% { transform: scale(.998); }
  100% { transform: scale(1); }
}

@keyframes correctFlash {
  0% { opacity: 0; }
  24% { opacity: 1; }
  82% { opacity: .34; }
  100% { opacity: 0; }
}

@keyframes correctRingPop {
  0% { opacity: 0; transform: scale(.82); }
  45% { opacity: 1; transform: scale(1.04); }
  100% { opacity: .98; transform: scale(1); }
}

@keyframes correctRingDraw {
  0% { stroke-dashoffset: 100; }
  100% { stroke-dashoffset: 0; }
}

@keyframes hurryTimerPulse {
  from {
    box-shadow:
      inset 0 0 0 2px rgba(255, 255, 255, .9),
      inset 0 0 0 4px rgba(15, 23, 42, .08),
      0 8px 18px rgba(15, 23, 42, .1);
  }
  to {
    box-shadow:
      inset 0 0 0 2px rgba(255, 255, 255, .96),
      inset 0 0 0 5px rgba(239, 68, 68, .28),
      0 0 28px rgba(239, 68, 68, .5);
  }
}

@keyframes wrongBoardShake {
  0%, 100% { transform: translateX(0); }
  14% { transform: translateX(-10px) rotate(-.8deg); }
  28% { transform: translateX(9px) rotate(.7deg); }
  42% { transform: translateX(-7px) rotate(-.5deg); }
  56% { transform: translateX(5px) rotate(.35deg); }
  70% { transform: translateX(-3px); }
}

@keyframes wrongInputShake {
  0%, 100% { transform: translateX(0); }
  20% { transform: translateX(-8px); }
  40% { transform: translateX(7px); }
  60% { transform: translateX(-5px); }
  80% { transform: translateX(3px); }
}

@keyframes wrongFlash {
  0% { opacity: 0; }
  22% { opacity: 1; }
  100% { opacity: 0; }
}

@keyframes answerPop {
  0% { opacity: 0; transform: scale(.72); }
  58% { opacity: 1; transform: scale(1.07); }
  100% { opacity: 1; transform: scale(1); }
}

@keyframes wrongSceneShake {
  0%, 100% { transform: translateX(0); }
  16% { transform: translateX(-8px); }
  32% { transform: translateX(7px); }
  48% { transform: translateX(-5px); }
  64% { transform: translateX(4px); }
  80% { transform: translateX(-2px); }
}

@keyframes wrongSceneTint {
  0% { opacity: 0; }
  22% { opacity: 1; }
  100% { opacity: 0; }
}