:root { color-scheme: light; font-family: "Segoe UI", "Microsoft YaHei", sans-serif; color: #172b4d; background: #f4f7fc; }
* { box-sizing: border-box; }
body { margin: 0; }
.login-shell { display: grid; grid-template-columns: 1.05fr 1fr; min-height: 100vh; }
.intro { position: relative; display: flex; flex-direction: column; justify-content: space-between; overflow: hidden; background: #102a56; color: #fff; padding: 42px 8.5%; }
.intro::before { content: ""; position: absolute; width: 640px; height: 640px; border: 1px solid #ffffff0b; border-radius: 50%; top: -280px; right: -350px; box-shadow: 0 0 0 100px #ffffff03, 0 0 0 200px #ffffff02; pointer-events: none; }
.brand { display: inline-flex; width: fit-content; align-items: center; gap: 12px; color: #fff; text-decoration: none; font-size: 18px; font-weight: 600; letter-spacing: 1px; }
.brand-icon { background: #2d75ed; display: grid; place-items: center; width: 36px; height: 36px; border-radius: 10px; font-size: 14px; padding-left: 2px; }
.intro-copy { position: relative; margin: 64px 0; max-width: 450px; }
.eyebrow { color: #91b9f7; font-size: 11px; font-weight: 600; letter-spacing: 2.5px; }
h1 { font-size: clamp(30px, 3.2vw, 47px); line-height: 1.5; letter-spacing: 1px; font-weight: 600; margin: 18px 0; }
.intro-copy > p { color: #b4c6df; font-size: 14px; line-height: 2; }
.timeline { position: relative; margin-top: 45px; border: 1px solid #ffffff17; padding: 22px 22px 14px; border-radius: 12px; background: #ffffff05; }
.timeline-top { display: flex; justify-content: space-between; color: #99b1d2; font-size: 11px; margin-bottom: 18px; }
.track { display: grid; grid-template-columns: 70px 1fr; align-items: center; gap: 10px; margin-bottom: 12px; font-size: 10px; color: #b7c9e3; }
.bar { height: 23px; border-radius: 4px; }
.text-bar { width: 92%; background: repeating-linear-gradient(90deg, #457fda 0, #457fda 29%, #2a4e85 29%, #2a4e85 30%); }
.audio-bar { margin-left: 8%; width: 77%; background: repeating-linear-gradient(90deg, #5ea7af 0, #5ea7af 2px, #2c646b 2px, #2c646b 5px); }
.video-bar { width: 96%; background: repeating-linear-gradient(90deg, #8f85b2 0, #8f85b2 23%, #4a476c 23%, #4a476c 24%); }
.playhead { position: absolute; width: 1px; height: 108px; background: #d7e4fd99; top: 51px; left: 62%; }
.intro-foot { margin: 0; font-size: 11px; color: #91aacc; letter-spacing: 2px; }
.login-panel { display: grid; place-items: center; padding: 64px 32px; background: #fff; }
.form-wrap { width: 100%; max-width: 362px; }
.form-kicker { color: #3674d7; font-size: 12px; font-weight: 600; letter-spacing: 2px; }
h2 { margin: 13px 0 12px; font-size: 26px; letter-spacing: .2px; font-weight: 600; }
.form-description { margin: 0 0 36px; font-size: 13px; color: #8391a7; }
form label { display: block; margin: 22px 0 9px; font-size: 13px; font-weight: 600; color: #40516e; }
form input:not([type=hidden]) { display: block; width: 100%; padding: 13px 14px; font: inherit; font-size: 14px; border: 1px solid #dbe2ec; border-radius: 6px; background: #fcfdff; color: #172b4d; transition: border-color .15s, box-shadow .15s; }
form input::placeholder { color: #a6afbe; }
form input:focus { border-color: #4385ed; outline: none; box-shadow: 0 0 0 3px #1677ff15; background: #fff; }
form button { display: flex; justify-content: space-between; align-items: center; width: 100%; margin-top: 30px; padding: 14px 17px; border: 0; border-radius: 6px; background: #2169db; color: #fff; font: inherit; font-size: 14px; cursor: pointer; transition: background .15s; }
form button:hover { background: #1758bd; }
form button:focus-visible { outline: 3px solid #8cb7ff; outline-offset: 3px; }
.help { margin: 20px 0 38px; font-size: 12px; color: #8b98ac; }
.privacy { border-top: 1px solid #edf0f5; padding-top: 22px; display: flex; gap: 10px; font-size: 11px; line-height: 1.8; color: #8b98ac; }
.privacy > span:first-child { color: #5d85bd; font-size: 18px; line-height: 1.2; }
.error { padding: 11px 13px; background: #fff4f2; border: 1px solid #ffd8d1; color: #b54637; border-radius: 6px; font-size: 12px; line-height: 1.6; }
@media (max-width: 820px) {
  .login-shell { grid-template-columns: 1fr; }
  .intro { padding: 25px 8%; }
  .intro-copy, .intro-foot { display: none; }
  .login-panel { padding: 50px 24px; align-items: start; }
  h2 { font-size: 25px; }
}