:root {
  --gs-navy: #0b1020;
  --gs-mid: #16223a;
  --gs-teal: #1f5f63;
  --gs-teal-2: #2d7a82;
  --gs-teal-soft: #e7f3f4;
  --gs-line: #d9dee6;
  --gs-panel: #ffffff;
  --gs-text-soft: #4a5568;
  --gs-glow: rgba(31, 95, 99, 0.22);
  --gs-shadow: 0 14px 30px rgba(11, 16, 32, 0.12);
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
}

body.student-shell {
  font-family: Inter, Segoe UI, Arial, sans-serif;
  color: var(--gs-mid);
  background: radial-gradient(circle at 12% -4%, #e7f8fb 0%, #f4f8fc 42%, #edf4fa 100%);
  position: relative;
  min-height: 100vh;
  overflow-wrap: anywhere;
  word-break: break-word;
}

body.student-shell::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  background-image:
    radial-gradient(rgba(19, 77, 86, 0.045) 0.7px, transparent 0.7px),
    radial-gradient(rgba(19, 77, 86, 0.03) 0.7px, transparent 0.7px);
  background-size: 5px 5px, 7px 7px;
  background-position: 0 0, 2px 3px;
  opacity: 0.42;
  z-index: -1;
}

.student-main {
  width: min(1120px, 100%);
  margin: 0 auto;
  padding: 0 18px 44px;
}

.student-card {
  background: var(--gs-panel);
  border: 1px solid var(--gs-line);
  border-radius: 20px;
  box-shadow: var(--gs-shadow);
}

.student-hero {
  margin: 10px 0 18px;
  padding: 24px;
  background: linear-gradient(145deg, #1f5f63 0%, #2a7a84 100%);
  color: #f6fbfd;
  border-radius: 20px;
  border: 1px solid rgba(255, 255, 255, 0.24);
  position: relative;
  overflow: hidden;
  box-shadow: 0 16px 34px rgba(11, 16, 32, 0.14);
}

.student-hero::after {
  content: "";
  position: absolute;
  width: 260px;
  height: 260px;
  right: -80px;
  top: -90px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(255, 255, 255, 0.28), rgba(255, 255, 255, 0));
}

.student-hero h1 {
  margin: 6px 0 4px;
  font-size: clamp(28px, 5vw, 44px);
  line-height: 1.08;
  letter-spacing: -0.01em;
  max-width: 18ch;
}

.student-hero p {
  margin: 0;
  font-size: clamp(14px, 1.45vw, 18px);
  color: #d9eef2;
  max-width: 70ch;
}

.student-eyebrow {
  margin: 0;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.09em;
  text-transform: uppercase;
  color: #c5e5eb;
}

.join-layout {
  display: grid;
  grid-template-columns: 1.08fr 0.92fr;
  gap: 20px;
}

.join-form-shell {
  padding: 22px;
}

.join-form-shell h2 {
  margin: 0 0 14px;
  font-size: clamp(24px, 3.3vw, 30px);
}

.join-note {
  margin: 0 0 16px;
  color: var(--gs-text-soft);
}

.join-field {
  display: grid;
  gap: 8px;
  margin-bottom: 14px;
}

.join-field label {
  font-weight: 700;
  color: #1c344f;
}

.join-input {
  min-height: 46px;
  border-radius: 12px;
  border: 1px solid var(--gs-line);
  padding: 0 12px;
  font-size: 16px;
  color: #213047;
  background: #fff;
}

.join-input:focus-visible {
  outline: 3px solid rgba(31, 95, 99, 0.3);
  outline-offset: 2px;
}

.avatar-grid {
  display: grid;
  gap: 12px;
  margin-top: 8px;
}

.avatar-pack {
  border: 1px solid #d5e1ec;
  border-radius: 12px;
  background: linear-gradient(160deg, #f8fcff 0%, #f4f8ff 100%);
  padding: 10px;
  position: relative;
  overflow: hidden;
}

.avatar-pack-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
}

.avatar-pack-title {
  margin: 0 0 8px;
  font-size: 11px;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: #325573;
}

.avatar-pack-subtitle {
  margin: -4px 0 8px;
  color: #4f6881;
  font-size: 12px;
  font-weight: 600;
}

.avatar-pack-glow {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--pack-glow, #1f8f8f);
  box-shadow: 0 0 0 4px color-mix(in srgb, var(--pack-glow, #1f8f8f) 24%, transparent);
}

.avatar-pack-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 8px;
}

.avatar-tile {
  border: 1px solid var(--gs-line);
  border-radius: 12px;
  background: #fff;
  min-height: 92px;
  padding: 8px 6px;
  cursor: pointer;
  transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 6px;
  position: relative;
  overflow: hidden;
}

.avatar-tile:hover {
  transform: translateY(-2px);
  border-color: rgba(31, 95, 99, 0.44);
  box-shadow: 0 8px 14px rgba(11, 16, 32, 0.09);
}

.avatar-tile.is-selected {
  border-color: #1f5f63;
  background: #edf7f8;
  box-shadow: 0 0 0 2px rgba(31, 95, 99, 0.16) inset;
}

.avatar-tier-chip {
  position: absolute;
  top: 6px;
  right: 6px;
  border-radius: 999px;
  font-size: 9px;
  font-weight: 800;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  padding: 2px 6px;
  border: 1px solid transparent;
}

.avatar-tier-rare {
  background: #ebf4ff;
  color: #275290;
  border-color: #b7cbeb;
}

.avatar-tier-epic {
  background: #f3ebff;
  color: #5d2a8f;
  border-color: #cfb5ea;
}

.avatar-tier-legend {
  background: #fff6e8;
  color: #8c5d1a;
  border-color: #e3ca9e;
}

.avatar-thumb {
  display: inline-flex;
}

.gs-avatar-frame {
  position: relative;
  width: var(--avatar-size);
  height: var(--avatar-size);
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.gs-avatar-glow {
  position: absolute;
  inset: 8%;
  border-radius: 50%;
  background: radial-gradient(circle, color-mix(in srgb, var(--avatar-accent) 42%, transparent), transparent 72%);
  filter: blur(8px);
}

.gs-avatar-ring {
  position: absolute;
  inset: -1px;
  border-radius: 50%;
  background: conic-gradient(from 130deg, color-mix(in srgb, var(--avatar-accent) 85%, #fff) 0deg, transparent 130deg, color-mix(in srgb, var(--avatar-accent) 90%, #fff) 240deg, transparent 360deg);
  animation: avatarRingSpin 5.4s linear infinite;
}

.gs-avatar-img {
  width: var(--avatar-size);
  height: var(--avatar-size);
  border-radius: 999px;
  border: 2px solid color-mix(in srgb, var(--avatar-accent) 76%, #ffffff);
  object-fit: cover;
  position: relative;
  z-index: 1;
  background: #eaf1f7;
}

.gs-avatar-rank {
  position: absolute;
  right: -2px;
  bottom: -2px;
  min-width: 18px;
  height: 18px;
  border-radius: 999px;
  border: 1px solid #fff;
  background: color-mix(in srgb, var(--avatar-accent) 84%, #102037);
  color: #fff;
  font-size: 9px;
  font-weight: 800;
  letter-spacing: 0.04em;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  z-index: 2;
}

.gs-avatar-tier-legend .gs-avatar-glow {
  filter: blur(9px) saturate(1.2);
}

.avatar-tile.is-selected .gs-avatar-ring {
  animation-duration: 3.8s;
}

.avatar-label {
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: #35516e;
  text-align: center;
}

.join-actions {
  margin-top: 14px;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: center;
}

.accent-picker {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 4px;
}

.accent-chip {
  border: 1px solid #c9d9e8;
  border-radius: 999px;
  padding: 5px 10px;
  min-height: 34px;
  background: #fff;
  color: #284660;
  font: 700 11px Inter, Segoe UI, Arial, sans-serif;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.accent-chip::before {
  content: "";
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--accent-color, #1f8f8f);
  border: 1px solid rgba(0, 0, 0, 0.15);
}

.accent-chip.is-selected {
  border-color: #1f5f63;
  background: #edf7f8;
  box-shadow: 0 0 0 2px rgba(31, 95, 99, 0.14) inset;
}

.btn-primary-join,
.btn-secondary-join {
  min-height: 46px;
  border-radius: 999px;
  border: 1px solid transparent;
  padding: 0 18px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  letter-spacing: 0.03em;
  text-transform: uppercase;
  font-size: 12px;
  line-height: 1;
  white-space: nowrap;
  text-align: center;
  text-decoration: none;
  cursor: pointer;
  transition: transform 0.2s ease, box-shadow 0.2s ease, filter 0.2s ease;
}

.btn-surprise {
  border-style: dashed;
}

.btn-primary-join {
  background: linear-gradient(180deg, #37a2aa 0%, #1f5f63 100%);
  color: #fff;
  box-shadow: 0 10px 20px rgba(31, 95, 99, 0.27);
}

.btn-secondary-join {
  background: #fff;
  color: #1f5f63;
  border-color: #b7d3d7;
}

.btn-primary-join:hover,
.btn-secondary-join:hover {
  transform: translateY(-2px);
}

.join-status {
  margin: 8px 0 0;
  min-height: 24px;
  color: #2b6074;
  font-weight: 600;
}

.join-status.is-error {
  color: #9b1d1d;
}

.join-confirmation {
  margin-top: 10px;
  border: 1px solid #c0e0d7;
  background: #edf9f4;
  color: #215241;
  border-radius: 12px;
  padding: 10px 12px;
  opacity: 0;
  transform: translateY(6px);
  transition: opacity 0.22s ease, transform 0.22s ease;
}

.join-confirmation.show {
  opacity: 1;
  transform: translateY(0);
}

.join-side-panel {
  padding: 22px;
  position: relative;
}

.selected-avatar-preview {
  margin: 8px 0 4px;
  width: 92px;
  height: 92px;
}

.support-note {
  margin-top: 14px;
  font-size: 13px;
  color: #4a5f78;
  background: #f4f9fb;
  border: 1px dashed #c8d7e7;
  border-radius: 12px;
  padding: 10px;
}

.rank-shell {
  padding: 18px 20px 22px;
  position: relative;
  overflow: hidden;
}

.rank-shell::before {
  content: "";
  position: absolute;
  inset: 0 0 auto;
  height: 3px;
  background: linear-gradient(90deg, #1f5f63, #44b4bf, #c79a2f);
  opacity: 0.75;
  pointer-events: none;
}

.lobby-header-grid {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 14px;
  align-items: center;
}

.lobby-pin {
  margin: 8px 0 0;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 34px;
  font-weight: 900;
  letter-spacing: 0.08em;
  color: #13464f;
}

.lobby-subtle {
  margin: 6px 0 0;
  color: var(--gs-text-soft);
}

.banner-illustration {
  width: min(320px, 100%);
  border: 1px solid #c4dbe0;
  border-radius: 18px;
  background: linear-gradient(160deg, #ebf8fa 0%, #e4f3f7 100%);
  padding: 10px;
}

.demo-tools {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 12px 0;
  align-items: center;
}

.lobby-hype {
  margin: 8px 0 12px;
  border: 1px solid #d3dfeb;
  border-radius: 12px;
  background: linear-gradient(165deg, #ffffff 0%, #f2f8ff 100%);
  padding: 10px;
}

.lobby-hype-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
}

.lobby-hype-kicker {
  margin: 0;
  font-size: 11px;
  font-weight: 800;
  letter-spacing: 0.09em;
  text-transform: uppercase;
  color: #345c78;
}

.lobby-hype-value {
  margin: 0;
  font-size: 16px;
  font-weight: 900;
  color: #12475b;
}

.lobby-hype-track {
  margin-top: 8px;
  height: 8px;
  border-radius: 999px;
  background: #e2edf7;
  overflow: hidden;
}

.lobby-hype-track > span {
  display: block;
  width: 0;
  height: 100%;
  background: linear-gradient(90deg, #2d8f97 0%, #42c0ca 58%, #c79a2f 100%);
  transition: width 0.35s ease;
}

.demo-hint {
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.03em;
  color: #3d5f7e;
}

.rank-list {
  display: grid;
  gap: 10px;
  margin-top: 10px;
}

.rank-row {
  border: 1px solid #d5e1ec;
  border-radius: 14px;
  background: #fff;
  display: grid;
  grid-template-columns: 52px 56px 1fr auto;
  align-items: center;
  gap: 10px;
  padding: 8px 10px;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.rank-row:hover {
  transform: translateY(-1px);
  box-shadow: 0 10px 16px rgba(11, 16, 32, 0.08);
}

.rank-row.rank-top-1 {
  border-color: rgba(29, 122, 104, 0.45);
  box-shadow: 0 0 0 2px rgba(40, 164, 128, 0.12) inset;
  background: linear-gradient(90deg, rgba(236, 252, 247, 0.9), #fff);
  animation: topRankPulse 2.8s ease-in-out infinite;
}

.rank-row.rank-top-2 {
  border-color: rgba(50, 97, 145, 0.45);
  background: linear-gradient(90deg, rgba(240, 246, 255, 0.9), #fff);
}

.rank-row.rank-top-3 {
  border-color: rgba(88, 102, 140, 0.38);
  background: linear-gradient(90deg, rgba(255, 249, 241, 0.9), #fff);
}

.rank-num {
  font-weight: 900;
  color: #215668;
  letter-spacing: 0.02em;
}

.rank-avatar {
  display: inline-flex;
  align-items: center;
}

.rank-name {
  display: grid;
  gap: 2px;
  color: #1f2e44;
  overflow-wrap: anywhere;
}

.rank-name b {
  font-weight: 800;
}

.rank-meta {
  font-size: 11px;
  color: #53708d;
}

.rank-score {
  font-weight: 900;
  color: #125069;
  white-space: nowrap;
}

.empty-state {
  border: 1px dashed #bfd2e4;
  border-radius: 14px;
  padding: 18px;
  color: #436280;
  background: #f5f9fc;
}

.winner-preview-card {
  border: 1px solid #c6dee7;
  border-radius: 15px;
  padding: 10px;
  margin-top: 14px;
  background: radial-gradient(circle at 20% 0%, rgba(49, 188, 153, 0.16) 0%, rgba(255, 255, 255, 1) 64%);
  display: grid;
  grid-template-columns: 62px 1fr auto;
  align-items: center;
  gap: 10px;
}

.winner-preview-kicker {
  margin: 0;
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: #507291;
}

.winner-preview-name {
  margin: 2px 0 0;
  font-weight: 800;
  color: #1f2e44;
}

.winner-preview-score {
  margin: 0;
  font-weight: 900;
  color: #144f5f;
}

.winner-preview-empty {
  margin: 10px 0 0;
  color: #55708b;
}

.winner-layout {
  display: grid;
  gap: 16px;
}

.winner-main-card {
  border: 1px solid #b9d8de;
  border-radius: 20px;
  padding: 20px;
  background: radial-gradient(circle at 50% 0%, rgba(83, 211, 180, 0.26) 0%, rgba(255, 255, 255, 1) 60%);
  text-align: center;
  position: relative;
  overflow: hidden;
}

.winner-main-card::before {
  content: "";
  position: absolute;
  inset: -20% -10%;
  background: radial-gradient(circle at 50% 10%, rgba(63, 194, 168, 0.28), rgba(63, 194, 168, 0));
  z-index: 0;
}

.winner-main-card > * {
  position: relative;
  z-index: 1;
}

.winner-main-kicker {
  margin: 0;
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.12em;
  color: #2d6d66;
}

.winner-main-card h2 {
  margin: 10px 0 0;
  font-size: clamp(24px, 4vw, 34px);
  color: #15334d;
}

.winner-main-score {
  margin: 8px 0 0;
  font-size: 20px;
  font-weight: 900;
  color: #1e5f67;
}

.winner-main-avatar {
  display: inline-flex;
  margin-top: 8px;
}

.podium-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.podium-card {
  border: 1px solid #d0deea;
  border-radius: 16px;
  padding: 14px;
  background: #fff;
  text-align: center;
  position: relative;
}

.podium-card::after {
  content: "";
  position: absolute;
  inset: auto 12% -20px;
  height: 30px;
  background: radial-gradient(circle, rgba(31, 95, 99, 0.24), rgba(31, 95, 99, 0));
  filter: blur(10px);
}

.podium-rank {
  margin: 0;
  font-size: 12px;
  font-weight: 800;
  color: #537194;
  letter-spacing: 0.08em;
}

.podium-card h3 {
  margin: 6px 0 0;
}

.podium-score {
  margin: 4px 0 0;
  color: #215569;
  font-weight: 800;
}

.podium-avatar {
  display: inline-flex;
  margin-top: 8px;
}

.podium-card.is-empty {
  color: #6a829a;
  border-style: dashed;
}

.winner-empty {
  margin-top: 12px;
  border: 1px dashed #c9d9ea;
  border-radius: 14px;
  background: #f4f8fc;
  padding: 14px;
  color: #456583;
}

.confetti-layer {
  position: absolute;
  inset: 0;
  pointer-events: none;
  overflow: visible;
}

.confetti-piece {
  position: absolute;
  width: 9px;
  height: 14px;
  border-radius: 3px;
  top: 42%;
  left: 50%;
  background: linear-gradient(180deg, #53d3b4 0%, #2a8b77 100%);
  animation: confettiDrop 0.9s ease-out var(--delay) forwards;
}

.confetti-piece:nth-child(odd) {
  background: linear-gradient(180deg, #76bdd2 0%, #2d7f9b 100%);
}

.confetti-piece:nth-child(3n) {
  background: linear-gradient(180deg, #f0d891 0%, #c9a227 100%);
}

@keyframes confettiDrop {
  from {
    transform: translate3d(0, 0, 0) rotate(0deg);
    opacity: 1;
  }
  to {
    transform: translate3d(var(--x), var(--y), 0) rotate(var(--rot));
    opacity: 0;
  }
}

@keyframes topRankPulse {
  0%,
  100% {
    box-shadow: 0 0 0 2px rgba(40, 164, 128, 0.12) inset;
  }
  50% {
    box-shadow: 0 0 0 2px rgba(40, 164, 128, 0.18) inset, 0 0 22px rgba(55, 173, 138, 0.16);
  }
}

@keyframes avatarRingSpin {
  from {
    transform: rotate(0deg);
  }
  to {
    transform: rotate(360deg);
  }
}

@media (max-width: 920px) {
  .join-layout {
    grid-template-columns: 1fr;
  }

  .avatar-pack-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .lobby-header-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 620px) {
  .student-main {
    padding: 0 12px 36px;
  }

  .student-hero {
    padding: 18px;
  }

  .avatar-grid {
    gap: 10px;
  }

  .avatar-pack-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .rank-row {
    grid-template-columns: 42px 48px 1fr auto;
  }

  .lobby-pin {
    font-size: clamp(22px, 7vw, 30px);
  }

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

@media (prefers-reduced-motion: reduce) {
  * {
    transition: none !important;
    animation: none !important;
  }
  .gs-avatar-ring {
    display: none;
  }
}