:root {
  --bg: #03060c;
  --bg-2: #0a1220;
  --card: rgba(10, 16, 28, 0.78);
  --line: rgba(140, 168, 210, 0.18);
  --ink: #eef3fb;
  --ink-dim: #8b9bb5;
  --gold: #f3c06a;
  --gold-soft: rgba(243, 192, 106, 0.22);
  --cyan: #6ad4e8;
  --mono: 'IBM Plex Mono', monospace;
  --sans: 'Noto Sans TC', sans-serif;
  --radius: 20px;
  --safe-b: env(safe-area-inset-bottom, 0px);
  --safe-t: env(safe-area-inset-top, 0px);
}

*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  min-height: 100vh;
  min-height: 100dvh;
  font-family: var(--sans);
  color: var(--ink);
  background: var(--bg);
  overflow-x: hidden;
}

/* ── 背景場景 ── */
.login-scene {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
}

.scene-layer { position: absolute; inset: 0; }

.scene-stars {
  background-image:
    radial-gradient(1.2px 1.2px at 8% 14%, rgba(255,255,255,.7), transparent),
    radial-gradient(1px 1px at 22% 78%, rgba(255,255,255,.45), transparent),
    radial-gradient(1.5px 1.5px at 48% 22%, rgba(255,255,255,.55), transparent),
    radial-gradient(1px 1px at 67% 61%, rgba(255,255,255,.4), transparent),
    radial-gradient(1.2px 1.2px at 84% 33%, rgba(255,255,255,.5), transparent),
    radial-gradient(1px 1px at 91% 82%, rgba(255,255,255,.35), transparent),
    radial-gradient(ellipse 120% 80% at 50% 120%, rgba(20, 50, 90, 0.35), transparent);
}

.scene-glow {
  background:
    radial-gradient(ellipse 55% 45% at 18% 42%, rgba(55, 130, 220, 0.16), transparent 70%),
    radial-gradient(ellipse 50% 40% at 82% 58%, rgba(243, 192, 106, 0.08), transparent 68%),
    radial-gradient(circle at 50% 50%, transparent 42%, rgba(0,0,0,.35) 100%);
}

.scene-arcs {
  position: absolute;
  width: min(92vmin, 720px);
  height: min(92vmin, 720px);
  left: 50%;
  top: 46%;
  transform: translate(-50%, -50%);
  opacity: 0.55;
}

.scene-arcs .arc {
  fill: none;
  stroke-width: 1.2;
  stroke-linecap: round;
  stroke-dasharray: 6 14;
  animation: arc-drift 18s linear infinite;
}
.scene-arcs .a1 { stroke: rgba(106, 212, 232, 0.35); }
.scene-arcs .a2 { stroke: rgba(243, 192, 106, 0.28); animation-duration: 22s; animation-direction: reverse; }
.scene-arcs .a3 { stroke: rgba(140, 180, 230, 0.22); animation-duration: 26s; }

@keyframes arc-drift {
  to { stroke-dashoffset: -120; }
}

/* ── 主版面 ── */
.login-shell {
  position: relative;
  z-index: 1;
  min-height: 100vh;
  min-height: 100dvh;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: clamp(20px, 4vw, 48px);
  align-items: center;
  max-width: 1180px;
  margin: 0 auto;
  padding: calc(28px + var(--safe-t)) clamp(20px, 4vw, 48px) calc(28px + var(--safe-b));
}

/* ── 左側品牌 ── */
.login-brand {
  display: flex;
  flex-direction: column;
  gap: 28px;
  padding: 12px 8px;
}

.orbit-wrap {
  position: relative;
  width: min(300px, 78vw);
  height: min(300px, 78vw);
  margin: 0 auto;
  overflow: visible;
}

.orbit-core {
  position: absolute;
  inset: 22%;
  border-radius: 50%;
  background:
    radial-gradient(circle at 32% 28%, rgba(120, 180, 240, 0.55), transparent 45%),
    radial-gradient(circle at 60% 65%, rgba(30, 90, 60, 0.5), transparent 40%),
    linear-gradient(145deg, #1a3a5c 0%, #0d2038 40%, #081828 100%);
  box-shadow:
    inset -8px -12px 24px rgba(0,0,0,.45),
    inset 6px 8px 18px rgba(100, 160, 220, 0.15),
    0 0 48px rgba(60, 140, 220, 0.28);
  animation: earth-pulse 6s ease-in-out infinite;
}

@keyframes earth-pulse {
  0%, 100% { box-shadow: inset -8px -12px 24px rgba(0,0,0,.45), inset 6px 8px 18px rgba(100, 160, 220, 0.15), 0 0 44px rgba(60, 140, 220, 0.22); }
  50% { box-shadow: inset -8px -12px 24px rgba(0,0,0,.45), inset 6px 8px 18px rgba(100, 160, 220, 0.2), 0 0 58px rgba(80, 160, 240, 0.38); }
}

.orbit-ring {
  position: absolute;
  border-radius: 50%;
  border: 1px solid rgba(106, 212, 232, 0.2);
  pointer-events: none;
}
.orbit-ring.r1 {
  inset: 6%;
  transform: rotateX(62deg);
  animation: ring-spin 28s linear infinite;
}
.orbit-ring.r2 {
  inset: -2%;
  border-color: rgba(243, 192, 106, 0.14);
  transform: rotateX(68deg) rotateZ(32deg);
  animation: ring-spin 36s linear infinite reverse;
}

@keyframes ring-spin {
  to { transform: rotateX(62deg) rotateZ(360deg); }
}
@keyframes ring-spin-2 {
  from { transform: rotateX(68deg) rotateZ(32deg); }
  to { transform: rotateX(68deg) rotateZ(392deg); }
}
.orbit-ring.r2 { animation-name: ring-spin-2; }

.orbit-track {
  position: absolute;
  inset: 8%;
  border-radius: 50%;
  border: 1px dashed rgba(106, 212, 232, 0.28);
  animation: track-spin 18s linear infinite;
  pointer-events: none;
}

@keyframes track-spin {
  to { transform: rotate(360deg); }
}

.orbit-plane {
  position: absolute;
  left: 50%;
  top: 8%;
  z-index: 6;
  display: flex;
  align-items: center;
  justify-content: center;
  pointer-events: none;
  will-change: left, top, transform;
}

.plane-body {
  display: block;
  font-size: clamp(38px, 10vw, 52px);
  line-height: 1;
  color: var(--gold);
  filter:
    drop-shadow(0 0 12px rgba(243, 192, 106, 1))
    drop-shadow(0 0 24px rgba(255, 230, 160, 0.65));
}

.plane-glow {
  position: absolute;
  left: 50%;
  top: 50%;
  width: 44px;
  height: 8px;
  margin: -4px 0 0 -52px;
  border-radius: 99px;
  background: linear-gradient(90deg, rgba(243, 192, 106, 0.75), rgba(106, 212, 232, 0.15), transparent);
  opacity: 0.85;
  transform-origin: right center;
}

.brand-copy { text-align: center; }

.eyebrow {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.32em;
  text-transform: uppercase;
  color: var(--gold);
}

.brand-copy h1 {
  margin-top: 10px;
  font-size: clamp(26px, 4.5vw, 38px);
  font-weight: 900;
  letter-spacing: 0.05em;
  line-height: 1.2;
  background: linear-gradient(135deg, #fff 0%, #c8d8f0 55%, var(--gold) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.tagline {
  margin-top: 12px;
  font-size: clamp(13px, 2.2vw, 15px);
  color: var(--ink-dim);
  line-height: 1.65;
  max-width: 28em;
  margin-inline: auto;
}

.brand-pills {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 8px;
  margin-top: 22px;
}

.brand-pills li {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: rgba(255,255,255,0.03);
  font-size: 12px;
}

.brand-pills .k {
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.12em;
  color: var(--ink-dim);
}

.brand-pills .v { font-weight: 500; }

/* ── 登入卡片 ── */
.login-panel {
  display: flex;
  justify-content: center;
  align-items: center;
}

.login-card {
  width: min(420px, 100%);
  border-radius: var(--radius);
  border: 1px solid var(--line);
  background: var(--card);
  backdrop-filter: blur(20px) saturate(140%);
  -webkit-backdrop-filter: blur(20px) saturate(140%);
  box-shadow:
    0 32px 80px rgba(0, 0, 0, 0.5),
    0 0 0 1px rgba(255, 255, 255, 0.04) inset,
    0 1px 0 rgba(255, 255, 255, 0.06) inset;
  overflow: hidden;
}

.card-head {
  padding: 28px 28px 8px;
}

.card-head h2 {
  font-size: 22px;
  font-weight: 700;
  letter-spacing: 0.04em;
}

.card-head p {
  margin-top: 6px;
  font-size: 13px;
  color: var(--ink-dim);
}

.login-form {
  padding: 20px 28px 24px;
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.field .lbl {
  display: block;
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.16em;
  color: var(--ink-dim);
  margin-bottom: 8px;
}

.input-wrap {
  display: flex;
  align-items: center;
  gap: 0;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: rgba(4, 8, 16, 0.55);
  transition: border-color 0.2s, box-shadow 0.2s;
}

.input-wrap:focus-within {
  border-color: rgba(243, 192, 106, 0.45);
  box-shadow: 0 0 0 3px var(--gold-soft);
}

.input-wrap .ico {
  flex-shrink: 0;
  width: 42px;
  text-align: center;
  font-size: 11px;
  color: var(--ink-dim);
  font-family: var(--mono);
}

.input-wrap input {
  flex: 1;
  min-width: 0;
  border: none;
  background: transparent;
  color: var(--ink);
  font-family: var(--mono);
  font-size: 15px;
  padding: 14px 8px 14px 0;
  outline: none;
}

.input-wrap input::placeholder { color: rgba(139, 155, 181, 0.55); }

.pw-toggle {
  flex-shrink: 0;
  border: none;
  background: transparent;
  color: var(--ink-dim);
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.08em;
  padding: 0 14px;
  min-height: 44px;
  cursor: pointer;
}
.pw-toggle:hover { color: var(--gold); }

.error {
  font-size: 13px;
  color: #ffb4b4;
  background: rgba(255, 70, 70, 0.1);
  border: 1px solid rgba(255, 120, 120, 0.28);
  border-radius: 10px;
  padding: 10px 12px;
  line-height: 1.5;
}

.submit {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  width: 100%;
  min-height: 52px;
  margin-top: 4px;
  border: none;
  border-radius: 12px;
  cursor: pointer;
  font-family: var(--sans);
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: #1a1208;
  background: linear-gradient(135deg, #f8d898 0%, var(--gold) 45%, #d9a04a 100%);
  box-shadow: 0 10px 28px rgba(243, 192, 106, 0.28);
  transition: transform 0.15s, box-shadow 0.2s, filter 0.2s;
}

.submit:hover:not(:disabled) {
  filter: brightness(1.05);
  box-shadow: 0 14px 36px rgba(243, 192, 106, 0.38);
}

.submit:active:not(:disabled) { transform: scale(0.985); }

.submit:disabled {
  opacity: 0.75;
  cursor: wait;
}

.submit.is-loading .btn-label,
.submit.is-loading .btn-icon { opacity: 0; }

.btn-spinner {
  display: none;
  position: absolute;
  width: 20px;
  height: 20px;
  border: 2px solid rgba(26, 18, 8, 0.2);
  border-top-color: #1a1208;
  border-radius: 50%;
  animation: spin-btn 0.7s linear infinite;
}
.submit.is-loading .btn-spinner { display: block; }

@keyframes spin-btn { to { transform: rotate(360deg); } }

.card-foot {
  padding: 14px 28px 20px;
  border-top: 1px solid var(--line);
  text-align: center;
}

.card-foot .shield {
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.06em;
  color: var(--ink-dim);
}

/* ── RWD ── */
@media (max-width: 900px) {
  .login-shell {
    grid-template-columns: 1fr;
    align-content: start;
    padding-top: calc(16px + var(--safe-t));
  }

  .login-brand {
    gap: 16px;
    padding-top: 8px;
  }

  .orbit-wrap {
    width: min(220px, 58vw);
    height: min(220px, 58vw);
  }

  .plane-body { font-size: clamp(34px, 11vw, 44px); }

  .brand-copy h1 { font-size: clamp(24px, 7vw, 32px); }

  .brand-pills { margin-top: 14px; }
}

@media (max-width: 480px) {
  .login-shell {
    padding-left: 16px;
    padding-right: 16px;
    gap: 12px;
  }

  .card-head,
  .login-form,
  .card-foot { padding-left: 20px; padding-right: 20px; }

  .card-head { padding-top: 22px; }
  .card-head h2 { font-size: 20px; }

  .brand-pills li { padding: 7px 10px; font-size: 11px; }

  .scene-arcs { opacity: 0.35; }
}

@media (min-width: 901px) {
  .login-brand { padding-left: 12px; }
  .brand-copy { text-align: left; }
  .brand-pills { justify-content: flex-start; }
  .tagline { margin-inline: 0; }
  .orbit-wrap { margin: 0; }
}

@media (prefers-reduced-motion: reduce) {
  .scene-arcs .arc,
  .orbit-ring,
  .orbit-track,
  .orbit-core,
  .btn-spinner { animation: none; }
}