:root {
  --paper: rgba(249, 245, 238, 0.8);
  --paper-strong: rgba(255, 252, 246, 0.92);
  --panel-border: rgba(182, 165, 141, 0.35);
  --text-main: #3f372f;
  --text-soft: #685f55;
  --accent: #ba9070;
  --accent-deep: #8c674e;
  --sage: #aebcaa;
  --shadow: 0 24px 60px rgba(81, 63, 50, 0.18);
  --radius-xl: 30px;
  --radius-lg: 22px;
  --radius-md: 16px;
}

* {
  box-sizing: border-box;
}

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

body {
  position: relative;
  overflow-x: hidden;
  color: var(--text-main);
  font-family: "Microsoft YaHei UI", "PingFang SC", "Segoe UI", sans-serif;
  background: #ebe4da;
}

button,
input {
  font: inherit;
}

a {
  color: inherit;
}

.background-layer,
.mist-layer {
  position: fixed;
  inset: 0;
  pointer-events: none;
}

.background-layer {
  background:
    linear-gradient(120deg, rgba(242, 235, 227, 0.36), rgba(244, 241, 236, 0.14)),
    url("./login-background.jpg") center/cover no-repeat;
  transform: scale(1.02);
  filter: saturate(0.98) contrast(0.98);
}

.mist-layer {
  background:
    radial-gradient(circle at 15% 18%, rgba(255, 255, 255, 0.55), transparent 24%),
    radial-gradient(circle at 88% 14%, rgba(255, 244, 209, 0.2), transparent 16%),
    linear-gradient(180deg, rgba(255, 255, 255, 0.02), rgba(238, 231, 221, 0.12));
  mix-blend-mode: screen;
  opacity: 0.78;
}

.page-shell {
  position: relative;
  z-index: 1;
  min-height: 100vh;
  padding: 48px 28px 112px;
}

.hero,
.game-layout {
  width: min(1200px, 100%);
  margin: 0 auto;
}

.hero {
  display: grid;
  grid-template-columns: minmax(340px, 430px);
  justify-content: start;
  gap: 0;
  align-items: center;
  min-height: calc(100vh - 160px);
}

.eyebrow,
.panel-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  border: 1px solid rgba(132, 108, 91, 0.2);
  border-radius: 999px;
  padding: 7px 14px;
  background: rgba(255, 252, 248, 0.46);
  color: var(--accent-deep);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  font-size: 12px;
}

.eyebrow {
  margin-bottom: 18px;
}

.panel h2 {
  margin: 0;
  font-family: "STSong", "SimSun", serif;
  line-height: 1.12;
}

.lead,
.panel-description,
.soft-note,
.message {
  color: var(--text-soft);
}

.panel {
  position: relative;
  backdrop-filter: blur(16px);
  background:
    linear-gradient(180deg, rgba(255, 250, 245, 0.56), rgba(248, 243, 237, 0.42));
  border: 1px solid var(--panel-border);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow);
}

.panel::before {
  content: "";
  position: absolute;
  inset: 12px;
  border-radius: calc(var(--radius-xl) - 12px);
  border: 1px solid rgba(255, 255, 255, 0.35);
  pointer-events: none;
}

.login-panel {
  padding: 28px;
}

.panel-topline {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 18px;
}

.panel h2 {
  font-size: clamp(2rem, 3vw, 2.8rem);
}

.login-form {
  display: grid;
  gap: 18px;
  margin-top: 28px;
}

.field {
  display: grid;
  gap: 10px;
}

.field span {
  font-size: 0.95rem;
  color: var(--text-soft);
}

.field input {
  width: 100%;
  border: 1px solid rgba(153, 132, 114, 0.2);
  border-radius: 16px;
  padding: 16px 18px;
  background: rgba(255, 255, 255, 0.68);
  color: var(--text-main);
  outline: none;
  transition: border-color 160ms ease, box-shadow 160ms ease, transform 160ms ease;
}

.field input:focus {
  border-color: rgba(173, 137, 106, 0.72);
  box-shadow: 0 0 0 5px rgba(198, 162, 127, 0.12);
  transform: translateY(-1px);
}

.form-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
}

.remember {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--text-soft);
}

.remember input {
  accent-color: var(--accent);
}

.primary-button,
.ghost-button,
.control-button {
  border: 0;
  border-radius: 999px;
  cursor: pointer;
  transition: transform 160ms ease, box-shadow 160ms ease, background 160ms ease;
}

.primary-button {
  padding: 15px 20px;
  background: linear-gradient(135deg, #b88f71, #8d674f);
  color: #fffaf5;
  box-shadow: 0 14px 28px rgba(139, 102, 77, 0.28);
}

.ghost-button {
  padding: 13px 18px;
  background: rgba(255, 255, 255, 0.44);
  color: var(--accent-deep);
  border: 1px solid rgba(153, 132, 114, 0.22);
}

.primary-button:hover,
.ghost-button:hover,
.control-button:hover {
  transform: translateY(-2px);
}

.primary-button:active,
.ghost-button:active,
.control-button:active {
  transform: translateY(0);
}

.message {
  min-height: 24px;
  margin: 0;
  font-size: 0.92rem;
}

.message.error {
  color: #9f5d4d;
}

.message.success {
  color: #5d7867;
}

.hidden {
  display: none !important;
}

.game-layout {
  display: grid;
  grid-template-columns: minmax(420px, 1.1fr) minmax(300px, 0.9fr);
  gap: 28px;
  padding-top: 24px;
}

.game-panel,
.info-panel {
  padding: 26px;
}

.game-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 24px;
}

.game-board-wrap {
  position: relative;
  width: min(100%, 520px);
  margin: 0 auto;
  padding: 18px;
  border-radius: 26px;
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.58), rgba(248, 242, 233, 0.38));
  border: 1px solid rgba(159, 140, 123, 0.18);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.36);
}

#snake-board {
  display: block;
  width: 100%;
  height: auto;
  border-radius: 18px;
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.78), rgba(241, 235, 224, 0.82)),
    repeating-linear-gradient(
      0deg,
      rgba(169, 181, 163, 0.08) 0,
      rgba(169, 181, 163, 0.08) 21px,
      rgba(255, 255, 255, 0.22) 21px,
      rgba(255, 255, 255, 0.22) 42px
    ),
    repeating-linear-gradient(
      90deg,
      rgba(169, 181, 163, 0.08) 0,
      rgba(169, 181, 163, 0.08) 21px,
      rgba(255, 255, 255, 0.22) 21px,
      rgba(255, 255, 255, 0.22) 42px
    );
  box-shadow: inset 0 0 0 1px rgba(137, 117, 100, 0.12);
}

.scanline {
  position: absolute;
  inset: 18px;
  border-radius: 18px;
  background:
    linear-gradient(
      180deg,
      transparent,
      rgba(255, 255, 255, 0.1) 45%,
      transparent 65%
    );
  opacity: 0.65;
  mix-blend-mode: screen;
  pointer-events: none;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
  margin-top: 18px;
}

.stat-card {
  border-radius: var(--radius-lg);
  padding: 18px;
  background: rgba(255, 255, 255, 0.5);
  border: 1px solid rgba(153, 132, 114, 0.18);
}

.stat-card:last-child {
  grid-column: 1 / -1;
}

.stat-label {
  display: block;
  margin-bottom: 10px;
  color: var(--text-soft);
  font-size: 0.9rem;
}

.stat-card strong {
  font-size: clamp(1.4rem, 2vw, 2rem);
  font-family: "STSong", "SimSun", serif;
}

.action-group {
  display: flex;
  gap: 12px;
  margin-top: 18px;
}

.action-group > * {
  flex: 1;
}

.mobile-controls {
  display: none;
  width: min(100%, 260px);
  margin: 18px auto 0;
}

.control-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
  margin-top: 10px;
}

.control-button {
  min-height: 52px;
  background: rgba(255, 255, 255, 0.7);
  color: var(--accent-deep);
  border: 1px solid rgba(153, 132, 114, 0.2);
}

.site-footer {
  position: fixed;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 2;
  padding: 16px 24px 24px;
}

.site-footer-inner {
  width: min(760px, calc(100% - 16px));
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 16px 24px;
  border-radius: 999px;
  background: rgba(255, 251, 246, 0.62);
  backdrop-filter: blur(20px);
  border: 1px solid rgba(182, 165, 141, 0.34);
  box-shadow: 0 18px 48px rgba(97, 74, 58, 0.18);
  color: var(--accent-deep);
}

.site-footer-inner a {
  text-decoration: none;
  font-weight: 800;
  font-size: 1.15rem;
  letter-spacing: 0.02em;
}

.reveal {
  animation: rise-in 780ms cubic-bezier(0.22, 1, 0.36, 1) both;
}

.reveal-delay {
  animation-delay: 120ms;
}

@keyframes rise-in {
  from {
    opacity: 0;
    transform: translateY(18px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@media (max-width: 980px) {
  .page-shell {
    padding: 22px 16px 110px;
  }

  .hero,
  .game-layout {
    grid-template-columns: 1fr;
  }

  .hero {
    min-height: auto;
    padding-top: 18px;
  }

  .game-layout {
    gap: 18px;
  }
}

@media (max-width: 720px) {
  .login-panel,
  .game-panel,
  .info-panel {
    padding: 20px;
    border-radius: 24px;
  }

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

  .stat-card:last-child {
    grid-column: auto;
  }

  .action-group {
    flex-direction: column;
  }

  .mobile-controls {
    display: block;
  }

  .panel-topline,
  .game-header,
  .form-meta {
    flex-direction: column;
    align-items: flex-start;
  }

  .site-footer {
    padding: 14px 12px 18px;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation: none !important;
    transition: none !important;
    scroll-behavior: auto !important;
  }
}