/* 登录页 · 浅色 3D 空间背景（无照片） */
@import url("/static/css/fonts.css");

:root {
  --font-ui: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  --font-en: "DM Sans", var(--font-ui);
  --font-display: "Songti SC", "SimSun", "Noto Serif SC", serif;
  --ink: #123047;
  --muted: #5d7388;
  --line: #cfe0ec;
  --surface: rgba(255, 255, 255, 0.78);
  --accent: #0d8a9a;
  --accent-deep: #066a76;
  --accent-soft: #d7f3f6;
  --glow: rgba(13, 138, 154, 0.22);
  --sky-1: #eaf4fb;
  --sky-2: #d7ebf6;
  --sky-3: #c5e4ef;
  --px: 0px;
  --py: 0px;
}

.theme-yx {
  --accent: #0d8a9a;
  --accent-deep: #066a76;
  --accent-soft: #d7f3f6;
  --glow: rgba(13, 138, 154, 0.24);
  --sky-1: #e8f6f8;
  --sky-2: #d4eef3;
  --sky-3: #bfe4eb;
}
.theme-zy {
  --accent: #1f6fad;
  --accent-deep: #154e7c;
  --accent-soft: #dcebff;
  --glow: rgba(31, 111, 173, 0.24);
  --sky-1: #eaf3fb;
  --sky-2: #d8e8f7;
  --sky-3: #c4daf0;
}
.theme-platform {
  --accent: #0284c7;
  --accent-deep: #0369a1;
  --accent-soft: #e0f2fe;
  --glow: rgba(2, 132, 199, 0.22);
  --sky-1: #eef6fc;
  --sky-2: #ddeef9;
  --sky-3: #c9e4f4;
}

* { box-sizing: border-box; }

body.login-body {
  margin: 0;
  min-height: 100vh;
  font-family: var(--font-ui);
  color: var(--ink);
  background: linear-gradient(165deg, var(--sky-1) 0%, var(--sky-2) 48%, var(--sky-3) 100%);
  overflow-x: hidden;
  position: relative;
  isolation: isolate;
}

/* ---------- 3D scene ---------- */
.scene3d {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  perspective: 1200px;
  transform-style: preserve-3d;
  overflow: hidden;
}
.scene-glow {
  position: absolute;
  width: 48vw;
  height: 70vh;
  filter: blur(40px);
  opacity: 0.55;
}
.scene-glow-l {
  left: -12%;
  top: 10%;
  background: radial-gradient(ellipse at 40% 40%, color-mix(in srgb, var(--accent) 45%, #fff), transparent 68%);
  transform: translate3d(calc(var(--px) * 0.4), calc(var(--py) * 0.3), 0);
}
.scene-glow-r {
  right: -14%;
  bottom: 5%;
  background: radial-gradient(ellipse at 50% 40%, color-mix(in srgb, var(--accent) 38%, #dff3ff), transparent 70%);
  transform: translate3d(calc(var(--px) * -0.4), calc(var(--py) * -0.2), 0);
}
.scene-floor {
  position: absolute;
  left: -30%;
  right: -30%;
  bottom: -12%;
  height: 62%;
  background:
    linear-gradient(180deg, transparent 0%, rgba(255, 255, 255, 0.45) 22%, rgba(160, 200, 225, 0.55) 100%),
    repeating-linear-gradient(90deg, rgba(255, 255, 255, 0.2) 0 2px, transparent 2px 48px);
  transform: rotateX(66deg) translate3d(var(--px), calc(var(--py) * 0.35), 0);
  transform-origin: center top;
  box-shadow: 0 -50px 90px rgba(15, 60, 90, 0.12) inset;
}
.mesh {
  position: absolute;
  inset: -10%;
  opacity: 0.42;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.65) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.5) 1px, transparent 1px);
  background-size: 48px 48px;
  mask-image: radial-gradient(ellipse 95% 80% at 50% 45%, #000 15%, transparent 78%);
  transform: translate3d(calc(var(--px) * -0.35), calc(var(--py) * -0.35), 0);
  animation: meshDrift 18s linear infinite;
}
.scene-vignette {
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse 42% 55% at 50% 48%, rgba(255, 255, 255, 0.55) 0%, transparent 72%);
}
@keyframes meshDrift {
  from { background-position: 0 0, 0 0; }
  to { background-position: 48px 48px, 48px 48px; }
}

.orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(1px);
}
.orb-a {
  width: min(46vw, 460px);
  height: min(46vw, 460px);
  left: -10%;
  top: 2%;
  background: radial-gradient(circle at 35% 35%, #fff 0%, color-mix(in srgb, var(--accent) 42%, #fff) 40%, transparent 72%);
  opacity: 0.85;
  animation: floatA 10s ease-in-out infinite;
}
.orb-b {
  width: min(40vw, 400px);
  height: min(40vw, 400px);
  right: -8%;
  top: 12%;
  background: radial-gradient(circle at 40% 40%, #fff 0%, color-mix(in srgb, var(--accent) 36%, #e8f4ff) 45%, transparent 72%);
  opacity: 0.8;
  animation: floatB 12s ease-in-out infinite;
}
.orb-c {
  width: min(30vw, 280px);
  height: min(30vw, 280px);
  left: 8%;
  bottom: 8%;
  background: radial-gradient(circle at 40% 40%, rgba(255, 255, 255, 0.95), color-mix(in srgb, var(--accent) 30%, transparent) 58%);
  opacity: 0.7;
  animation: floatC 14s ease-in-out infinite;
}
.orb-d {
  width: min(26vw, 240px);
  height: min(26vw, 240px);
  right: 10%;
  bottom: 18%;
  background: radial-gradient(circle at 45% 40%, #fff, color-mix(in srgb, var(--accent) 26%, transparent) 62%);
  opacity: 0.65;
  animation: floatA 15s ease-in-out infinite reverse;
}

.pillar {
  position: absolute;
  width: min(120px, 14vw);
  height: min(420px, 58vh);
  border-radius: 28px;
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.78) 0%, rgba(255, 255, 255, 0.22) 55%, rgba(255, 255, 255, 0.08) 100%);
  border: 1px solid rgba(255, 255, 255, 0.8);
  box-shadow:
    0 1px 0 rgba(255, 255, 255, 0.95) inset,
    0 28px 50px rgba(20, 55, 85, 0.16);
  backdrop-filter: blur(10px);
}
.pillar-l {
  left: 4%;
  top: 16%;
  opacity: 0.72;
  transform:
    rotateX(8deg) rotateY(32deg)
    translate3d(calc(var(--px) * 1.4), calc(var(--py) * 0.6), 30px);
  animation: pillarDrift 11s ease-in-out infinite;
}
.pillar-r {
  right: 5%;
  top: 20%;
  opacity: 0.68;
  transform:
    rotateX(10deg) rotateY(-30deg)
    translate3d(calc(var(--px) * -1.3), calc(var(--py) * 0.7), 40px);
  animation: pillarDrift 13s ease-in-out infinite reverse;
}

.slab {
  position: absolute;
  border-radius: 22px;
  background:
    linear-gradient(145deg, rgba(255, 255, 255, 0.82) 0%, rgba(255, 255, 255, 0.35) 50%, rgba(255, 255, 255, 0.14) 100%);
  border: 1px solid rgba(255, 255, 255, 0.85);
  box-shadow:
    0 1px 0 rgba(255, 255, 255, 0.95) inset,
    0 22px 44px rgba(20, 55, 85, 0.16),
    0 6px 14px rgba(20, 55, 85, 0.08);
  backdrop-filter: blur(10px);
  transform-style: preserve-3d;
}
.slab-1 {
  width: min(230px, 26vw);
  height: min(140px, 16vw);
  left: 3%;
  top: 14%;
  opacity: 0.9;
  transform:
    rotateX(18deg) rotateY(-32deg) rotateZ(-6deg)
    translate3d(calc(var(--px) * 1.4), calc(var(--py) * 0.9), 50px);
  animation: slabFloat1 9s ease-in-out infinite;
}
.slab-2 {
  width: min(190px, 22vw);
  height: min(190px, 22vw);
  right: 3%;
  top: 18%;
  border-radius: 30px;
  opacity: 0.88;
  transform:
    rotateX(24deg) rotateY(28deg) rotateZ(8deg)
    translate3d(calc(var(--px) * -1.3), calc(var(--py) * 1.1), 70px);
  animation: slabFloat2 11s ease-in-out infinite;
}
.slab-3 {
  width: min(260px, 30vw);
  height: min(96px, 12vw);
  left: 6%;
  bottom: 16%;
  opacity: 0.8;
  transform:
    rotateX(55deg) rotateY(-14deg)
    translate3d(calc(var(--px) * 0.8), calc(var(--py) * -0.5), 30px);
  animation: slabFloat3 13s ease-in-out infinite;
}
.slab-4 {
  width: min(160px, 18vw);
  height: min(100px, 12vw);
  right: 8%;
  bottom: 22%;
  opacity: 0.85;
  transform:
    rotateX(20deg) rotateY(36deg) rotateZ(-4deg)
    translate3d(calc(var(--px) * -1), calc(var(--py) * 0.5), 45px);
  animation: slabFloat1 12s ease-in-out infinite reverse;
}
.slab-5 {
  width: min(120px, 14vw);
  height: min(120px, 14vw);
  left: 18%;
  top: 42%;
  border-radius: 999px;
  opacity: 0.55;
  transform:
    rotateX(40deg) rotateY(-20deg)
    translate3d(calc(var(--px) * 0.7), calc(var(--py) * 0.4), 20px);
  animation: floatC 16s ease-in-out infinite;
}

.cube {
  position: absolute;
  width: min(88px, 11vw);
  height: min(88px, 11vw);
  border-radius: 18px;
  background:
    linear-gradient(145deg, rgba(255, 255, 255, 0.9), color-mix(in srgb, var(--accent) 18%, rgba(255, 255, 255, 0.35)));
  border: 1px solid rgba(255, 255, 255, 0.9);
  box-shadow:
    0 1px 0 #fff inset,
    0 18px 36px rgba(20, 55, 85, 0.18);
}
.cube-1 {
  left: 22%;
  top: 22%;
  opacity: 0.78;
  transform:
    rotateX(28deg) rotateY(-38deg) rotateZ(12deg)
    translate3d(calc(var(--px) * 1.1), calc(var(--py) * 0.7), 80px);
  animation: cubeSpin 14s ease-in-out infinite;
}
.cube-2 {
  right: 20%;
  top: 48%;
  opacity: 0.75;
  transform:
    rotateX(34deg) rotateY(42deg) rotateZ(-10deg)
    translate3d(calc(var(--px) * -1), calc(var(--py) * 0.6), 90px);
  animation: cubeSpin 16s ease-in-out infinite reverse;
}

.ring {
  position: absolute;
  border-radius: 50%;
  border: 2.5px solid color-mix(in srgb, var(--accent) 40%, rgba(255, 255, 255, 0.75));
  box-shadow:
    0 0 0 1px rgba(255, 255, 255, 0.45) inset,
    0 24px 48px rgba(20, 55, 85, 0.12);
}
.ring-1 {
  width: min(340px, 44vw);
  height: min(340px, 44vw);
  right: 8%;
  bottom: 6%;
  opacity: 0.85;
  transform: rotateX(66deg) translate3d(calc(var(--px) * -0.6), calc(var(--py) * 0.35), 0);
  animation: ringPulse 10s ease-in-out infinite;
}
.ring-2 {
  width: min(200px, 26vw);
  height: min(200px, 26vw);
  left: 8%;
  top: 10%;
  opacity: 0.8;
  transform: rotateX(58deg) rotateZ(-20deg) translate3d(calc(var(--px) * 0.5), calc(var(--py) * -0.25), 0);
  animation: ringPulse 12s ease-in-out infinite reverse;
}
.ring-3 {
  width: min(150px, 18vw);
  height: min(150px, 18vw);
  right: 28%;
  top: 12%;
  opacity: 0.6;
  border-width: 2px;
  transform: rotateX(62deg) rotateZ(15deg) translate3d(calc(var(--px) * -0.3), calc(var(--py) * 0.2), 0);
  animation: ringPulse 14s ease-in-out infinite;
}

@keyframes floatA {
  0%, 100% { transform: translate3d(var(--px), var(--py), 0) translateY(0); }
  50% { transform: translate3d(var(--px), var(--py), 0) translateY(-22px); }
}
@keyframes floatB {
  0%, 100% { transform: translate3d(calc(var(--px) * -0.8), calc(var(--py) * 0.6), 0) translateY(0); }
  50% { transform: translate3d(calc(var(--px) * -0.8), calc(var(--py) * 0.6), 0) translateY(20px); }
}
@keyframes floatC {
  0%, 100% { transform: translate3d(calc(var(--px) * 0.5), calc(var(--py) * -0.4), 0) scale(1); }
  50% { transform: translate3d(calc(var(--px) * 0.5), calc(var(--py) * -0.4), 0) scale(1.08); }
}
@keyframes slabFloat1 {
  0%, 100% { translate: 0 0; }
  50% { translate: 0 -18px; }
}
@keyframes slabFloat2 {
  0%, 100% { translate: 0 0; }
  50% { translate: 0 16px; }
}
@keyframes slabFloat3 {
  0%, 100% { translate: 0 0; }
  50% { translate: 10px -10px; }
}
@keyframes pillarDrift {
  0%, 100% { translate: 0 0; }
  50% { translate: 0 -16px; }
}
@keyframes cubeSpin {
  0%, 100% { translate: 0 0; filter: brightness(1); }
  50% { translate: 0 -14px; filter: brightness(1.06); }
}
@keyframes ringPulse {
  0%, 100% { opacity: 0.55; filter: brightness(1); }
  50% { opacity: 0.95; filter: brightness(1.08); }
}
@keyframes riseIn {
  from { opacity: 0; transform: translateY(16px) scale(0.98); }
  to { opacity: 1; transform: translateY(0) scale(1); }
}

/* ---------- Content shell ---------- */
.login-shell {
  position: relative;
  z-index: 1;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: clamp(20px, 4vh, 40px) 16px;
}

.login-compose {
  width: min(400px, 100%);
  display: flex;
  flex-direction: column;
  align-items: stretch;
  gap: 18px;
  animation: riseIn 0.55s ease both;
}

.brand-hero {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: 0;
}
.brand-logo {
  width: 64px;
  height: 64px;
  border-radius: 18px;
  margin-bottom: 14px;
  background: #fff;
  box-shadow:
    0 1px 0 rgba(255, 255, 255, 0.95) inset,
    0 12px 28px var(--glow),
    0 3px 8px rgba(20, 55, 85, 0.06);
}
.brand-kicker {
  margin: 0 0 8px;
  font-family: var(--font-en);
  font-size: 0.68rem;
  letter-spacing: 0.18em;
  font-weight: 700;
  color: var(--accent-deep);
  opacity: 0.9;
}
.brand-hero h1 {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(1.35rem, 3.4vw, 1.75rem);
  font-weight: 700;
  letter-spacing: 0.04em;
  line-height: 1.35;
  color: var(--ink);
  text-shadow: 0 1px 0 rgba(255, 255, 255, 0.85);
}
.brand-product {
  margin: 6px 0 0;
  font-family: var(--font-ui);
  font-size: clamp(1.05rem, 2.4vw, 1.2rem);
  font-weight: 700;
  letter-spacing: 0.12em;
  color: var(--accent-deep);
}
.brand-sub {
  margin: 8px 0 0;
  font-size: 0.86rem;
  color: var(--muted);
  letter-spacing: 0.04em;
}

.login-panel {
  width: 100%;
}

.login-card {
  width: 100%;
  background: rgba(255, 255, 255, 0.82);
  border: 1px solid rgba(255, 255, 255, 0.9);
  border-radius: 18px;
  padding: 24px 22px 18px;
  box-shadow:
    0 1px 0 rgba(255, 255, 255, 0.95) inset,
    0 18px 36px rgba(20, 55, 85, 0.1),
    0 6px 14px rgba(20, 55, 85, 0.05);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
}
.card-head {
  margin-bottom: 16px;
  text-align: center;
}
.card-head strong {
  display: block;
  font-size: 1.08rem;
  font-weight: 700;
  letter-spacing: 0.04em;
}
.card-head em {
  display: block;
  margin-top: 4px;
  font-style: normal;
  font-size: 0.8rem;
  color: var(--muted);
}

.login-card label {
  display: block;
  margin: 0 0 6px;
  font-size: 0.82rem;
  color: var(--muted);
  font-weight: 500;
}
.login-card input {
  width: 100%;
  margin: 0 0 12px;
  padding: 11px 12px;
  border: 1px solid var(--line);
  border-radius: 11px;
  background: rgba(255, 255, 255, 0.95);
  font: inherit;
  color: var(--ink);
  box-shadow: 0 1px 0 rgba(255, 255, 255, 0.8) inset;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}
.login-card input:focus {
  outline: none;
  border-color: color-mix(in srgb, var(--accent) 55%, var(--line));
  box-shadow: 0 0 0 3px var(--accent-soft);
}

.btn-login {
  width: 100%;
  margin-top: 2px;
  min-height: 44px;
  border: 0;
  border-radius: 11px;
  font: inherit;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: #fff;
  cursor: pointer;
  background: linear-gradient(180deg, var(--accent) 0%, var(--accent-deep) 100%);
  box-shadow:
    0 1px 0 rgba(255, 255, 255, 0.28) inset,
    0 12px 24px var(--glow);
  transition: transform 0.18s ease, box-shadow 0.18s ease;
}
.btn-login:hover {
  transform: translateY(-1px);
  box-shadow:
    0 1px 0 rgba(255, 255, 255, 0.32) inset,
    0 16px 28px var(--glow);
}
.btn-login:active { transform: translateY(1px); }

.card-links {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 14px;
  margin-top: 12px;
  justify-content: center;
}
.card-links a {
  color: var(--accent-deep);
  text-decoration: none;
  font-size: 0.8rem;
  font-weight: 500;
}
.card-links a:hover { text-decoration: underline; }

.login-msg {
  margin: 12px 0 0;
  font-size: 0.78rem;
  line-height: 1.5;
  color: var(--muted);
  text-align: center;
}

.login-foot {
  margin: 0;
  font-size: 0.72rem;
  color: var(--muted);
  opacity: 0.8;
  text-align: center;
  letter-spacing: 0.02em;
}

.site-beian {
  display: block;
  width: 100%;
  margin: 8px 0 0;
  padding: 0;
  font-size: 0.72rem;
  text-align: center;
  line-height: 1.5;
  color: var(--muted);
}
.site-beian a {
  color: var(--muted);
  text-decoration: none;
  opacity: 0.85;
}
.site-beian a:hover {
  text-decoration: underline;
  opacity: 1;
}

@media (max-width: 900px) {
  .pillar-l, .pillar-r, .cube-2, .slab-5 { display: none; }
  .slab-1, .slab-2, .slab-4 { opacity: 0.7; }
}
@media (max-width: 720px) {
  .login-compose { width: min(360px, 100%); gap: 16px; }
  .brand-hero h1 { font-size: 1.28rem; }
  .brand-product { font-size: 1rem; letter-spacing: 0.1em; }
  .slab-3, .ring-3, .cube-1 { display: none; }
  .orb-a, .orb-b { opacity: 0.7; }
}

@media (prefers-reduced-motion: reduce) {
  .orb, .slab, .ring, .mesh, .brand-hero, .login-panel {
    animation: none !important;
  }
}