:root {
  --bg-1: #0b1020;
  --bg-2: #111a33;
  --spot-1: #233764;
  --spot-2: #2a1e42;
  --card: rgba(16, 24, 44, 0.62);
  --card-border: rgba(255, 255, 255, 0.16);
  --text-main: #f3f6ff;
  --text-sub: #9da8c4;
  --ok: #67e2b4;
  --warn: #ffd07a;
  --error: #ff8f97;
  --btn: #8db7ff;
  --btn-dark: rgba(255, 255, 255, 0.12);
  --ghost-bg: rgba(255, 255, 255, 0.1);
  --ghost-border: rgba(255, 255, 255, 0.16);
  --input-bg: rgba(10, 16, 30, 0.45);
  --focus-ring: rgba(141, 183, 255, 0.2);
  --focus-border: rgba(141, 183, 255, 0.7);
}

body.theme-light {
  --bg-1: #eef3ff;
  --bg-2: #e4edf8;
  --spot-1: #d8e7ff;
  --spot-2: #f2dde8;
  --card: rgba(255, 255, 255, 0.66);
  --card-border: rgba(75, 96, 130, 0.32);
  --text-main: #17233a;
  --text-sub: #3f506d;
  --ok: #15734a;
  --warn: #8b5600;
  --error: #b4232f;
  --btn: #4f7ed6;
  --btn-dark: rgba(79, 126, 214, 0.12);
  --ghost-bg: rgba(79, 126, 214, 0.12);
  --ghost-border: rgba(79, 126, 214, 0.28);
  --input-bg: rgba(255, 255, 255, 0.82);
  --focus-ring: rgba(79, 126, 214, 0.18);
  --focus-border: rgba(79, 126, 214, 0.6);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "PingFang SC", sans-serif;
  color: var(--text-main);
  background:
    radial-gradient(1200px 800px at 10% 10%, var(--spot-1) 0%, transparent 60%),
    radial-gradient(900px 700px at 90% 90%, var(--spot-2) 0%, transparent 60%),
    linear-gradient(135deg, var(--bg-1), var(--bg-2));
}

.page {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 22px;
}

.card {
  width: 100%;
  max-width: 640px;
  padding: 24px;
  border-radius: 22px;
  background: var(--card);
  border: 1px solid var(--card-border);
  box-shadow:
    0 18px 40px rgba(0, 0, 0, 0.2),
    inset 0 1px 0 rgba(255, 255, 255, 0.2);
  backdrop-filter: blur(16px) saturate(130%);
}

.header {
  margin-bottom: 18px;
}

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

.tag {
  margin: 0;
  display: inline-block;
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--text-sub);
  text-transform: uppercase;
}

.switchers {
  display: flex;
  gap: 8px;
}

.ghost-btn {
  border: 1px solid var(--ghost-border);
  background: var(--ghost-bg);
  color: var(--text-main);
  border-radius: 10px;
  padding: 7px 10px;
  font-size: 12px;
  font-weight: 700;
  cursor: pointer;
}

h1 {
  margin: 8px 0 8px;
  font-size: 32px;
  line-height: 1.2;
}

.sub {
  margin: 0;
  color: var(--text-sub);
  font-size: 14px;
}

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

label {
  font-size: 13px;
  color: var(--text-main);
  font-weight: 700;
}

input {
  border: 1px solid var(--card-border);
  background: var(--input-bg);
  color: var(--text-main);
  border-radius: 12px;
  padding: 12px 14px;
  font-size: 15px;
  outline: none;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

input:focus {
  border-color: var(--focus-border);
  box-shadow: 0 0 0 3px var(--focus-ring);
}

.actions {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px;
  margin-top: 6px;
}

.form-tip {
  margin: 4px 2px 0;
  font-size: 13px;
  line-height: 1.45;
  color: var(--text-sub);
}

button {
  border: none;
  border-radius: 12px;
  padding: 12px 14px;
  font-size: 15px;
  font-weight: 700;
  cursor: pointer;
  color: #0d1732;
  background: linear-gradient(180deg, var(--btn), #79a8fd);
  transition: transform 0.15s ease, filter 0.2s ease, opacity 0.2s ease;
}

body.theme-light button {
  color: #f7faff;
}

body.theme-light .ghost-btn,
body.theme-light button.secondary {
  color: var(--text-main);
}

button:hover:not(:disabled) {
  filter: brightness(1.04);
  transform: translateY(-1px);
}

button:disabled {
  cursor: not-allowed;
  opacity: 0.6;
}

button.secondary {
  color: var(--text-main);
  background: var(--btn-dark);
  border: 1px solid var(--ghost-border);
}

.status {
  min-height: 24px;
  margin-top: 14px;
  font-size: 14px;
  line-height: 1.55;
  color: var(--text-sub);
  overflow-wrap: anywhere;
}

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

.status.warn {
  color: var(--warn);
}

.status.error {
  color: var(--error);
}

.result {
  margin-top: 16px;
  border-radius: 14px;
  border: 1px solid var(--card-border);
  background: rgba(8, 12, 24, 0.28);
  padding: 16px;
}

body.theme-light .result {
  background: rgba(255, 255, 255, 0.58);
}

.hidden {
  display: none;
}

.result-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 13px;
  color: var(--text-sub);
}

.channel {
  border-radius: 999px;
  padding: 3px 10px;
  border: 1px solid var(--card-border);
  color: var(--text-main);
}

.code {
  margin: 10px 0 12px;
  font-size: 44px;
  font-weight: 800;
  letter-spacing: 0.1em;
}

.meta {
  display: grid;
  gap: 8px;
}

.meta div {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  font-size: 13px;
  color: var(--text-sub);
}

.meta strong {
  color: var(--text-main);
  font-weight: 600;
}

.copy-btn {
  margin-top: 14px;
  width: 100%;
}

@media (max-width: 560px) {
  .card {
    padding: 18px;
    border-radius: 18px;
  }

  h1 {
    font-size: 28px;
  }

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

  .code {
    font-size: 36px;
    letter-spacing: 0.08em;
  }
}