/* 全站像素主题：硬边、霓虹、无圆角、无渐变 */

@font-face {
  font-family: "Fusion Pixel";
  src: url("../fonts/fusion-pixel-zh-hans.woff2") format("woff2");
  font-weight: 400;
  font-style: normal;
  font-display: swap;
}

:root {
  --navy: #1a1a2e;
  --navy-deep: #10101c;
  --panel: #12122a;
  --green: #33ff99;
  --cyan: #00e5ff;
  --magenta: #ff00ff;
  --white: #f4fff8;
  --muted: #8aa39a;
  --danger: #ff4d6d;
  --shadow: #05050c;
  --border: 2px;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  min-height: 100%;
  background: var(--navy);
  color: var(--white);
  font-family: "Fusion Pixel", ui-monospace, "SFMono-Regular", Menlo, monospace;
  letter-spacing: 0.04em;
  image-rendering: pixelated;
  -webkit-font-smoothing: none;
  text-rendering: geometricPrecision;
}

body {
  min-height: 100dvh;
  overflow-x: hidden;
}

/* 轻微点阵遮罩，增强 8-bit 质感（位图，不是渐变） */
body::before {
  content: "";
  pointer-events: none;
  position: fixed;
  inset: 0;
  z-index: 80;
  opacity: 0.07;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='4' height='4'%3E%3Crect width='2' height='2' fill='%23000'/%3E%3C/svg%3E");
  background-size: 4px 4px;
}

.hidden {
  display: none !important;
}

.page {
  position: relative;
  z-index: 1;
  min-height: 100dvh;
  padding: 20px 16px calc(20px + env(safe-area-inset-bottom));
}

.page-center {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 20px;
}

.wrap {
  width: min(100%, 720px);
  margin: 0 auto;
}

.title {
  margin: 0;
  color: var(--green);
  text-transform: uppercase;
  text-align: center;
  font-size: clamp(22px, 7vw, 36px);
  line-height: 1.35;
  font-weight: 400;
  text-shadow:
    2px 0 0 var(--magenta),
    -2px 0 0 var(--cyan),
    4px 4px 0 var(--shadow);
}

.subtitle,
.hint,
.footer-note,
.label,
.error-text {
  text-align: center;
  text-transform: uppercase;
}

.subtitle,
.hint {
  margin: 0;
  color: var(--cyan);
  font-size: clamp(12px, 3.4vw, 16px);
  line-height: 1.6;
  text-shadow: 2px 2px 0 var(--shadow);
}

.footer-note {
  margin-top: auto;
  color: var(--muted);
  font-size: 11px;
  line-height: 1.7;
}

.pixel-panel {
  background: var(--panel);
  border: var(--border) solid var(--green);
  box-shadow:
    6px 6px 0 var(--shadow),
    0 0 0 2px var(--navy-deep),
    0 0 12px var(--green);
  padding: 18px;
}

.btn,
.btn-mega,
.btn-tiny {
  appearance: none;
  font-family: inherit;
  text-transform: uppercase;
  cursor: pointer;
  border: var(--border) solid var(--green);
  background: var(--navy-deep);
  color: var(--green);
  box-shadow: 4px 4px 0 var(--shadow);
  transition: none;
}

.btn:active,
.btn-mega:active,
.btn-tiny:active,
.btn.is-down {
  transform: translate(4px, 4px);
  box-shadow: 0 0 0 var(--shadow);
}

.btn {
  min-height: 44px;
  padding: 10px 16px;
  font-size: 14px;
}

.btn-cyan {
  border-color: var(--cyan);
  color: var(--cyan);
  box-shadow: 4px 4px 0 var(--shadow), 0 0 10px var(--cyan);
}

.btn-magenta {
  border-color: var(--magenta);
  color: var(--magenta);
  box-shadow: 4px 4px 0 var(--shadow), 0 0 10px var(--magenta);
}

.btn,
.btn-mega,
.btn-tiny,
.card {
  -webkit-tap-highlight-color: transparent;
  border-radius: 0;
}

.btn-mega {
  width: min(86vw, 420px);
  min-height: 160px;
  height: 28vh;
  font-size: clamp(28px, 8vw, 48px);
  font-weight: 400;
  box-shadow:
    8px 8px 0 var(--shadow),
    0 0 16px var(--green);
}

.btn-hero {
  width: 100%;
  height: auto;
  min-height: 88px;
  font-size: clamp(22px, 7vw, 28px);
}

.mt-16 {
  margin-top: 16px;
}

.btn-tiny {
  min-height: 32px;
  padding: 6px 10px;
  font-size: 12px;
}

.btn:disabled {
  opacity: 0.45;
  cursor: not-allowed;
  transform: none;
}

.topbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 8px;
  margin-bottom: 16px;
}

.back-link {
  color: var(--cyan);
  text-decoration: none;
  border: var(--border) solid var(--cyan);
  padding: 6px 10px;
  font-size: 12px;
  box-shadow: 3px 3px 0 var(--shadow);
}

.field {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-bottom: 14px;
}

.field label {
  color: var(--cyan);
  font-size: 12px;
  text-transform: uppercase;
}

.field input {
  font-family: inherit;
  font-size: 18px;
  color: var(--white);
  background: var(--navy-deep);
  border: var(--border) solid var(--magenta);
  border-radius: 0;
  min-height: 48px;
  padding: 8px 12px;
  outline: none;
  box-shadow: 4px 4px 0 var(--shadow);
}

.field input:focus {
  border-color: var(--green);
  box-shadow: 4px 4px 0 var(--shadow), 0 0 10px var(--green);
}

.error-text {
  color: var(--danger);
  font-size: 13px;
  min-height: 1.4em;
}

.banner {
  width: min(100%, 720px);
  margin: 0 auto 16px;
  padding: 12px;
  border: var(--border) solid var(--danger);
  color: var(--danger);
  background: var(--navy-deep);
  box-shadow: 4px 4px 0 var(--shadow);
  font-size: 12px;
  line-height: 1.6;
}

.screen {
  width: 100%;
}

@media (min-width: 768px) {
  .page {
    padding: 32px 24px;
  }

  .btn {
    font-size: 16px;
  }
}