:root { font-family: "Microsoft YaHei", "PingFang SC", Arial, sans-serif; color: #1c1e1d; color-scheme: light; }
* { box-sizing: border-box; }
body { min-width: 1024px; min-height: 700px; margin: 0; overflow: hidden; background: #fbf9f6; }
button, input { font: inherit; } button { cursor: pointer; }
.login-stage { position: relative; display: grid; width: 100vw; min-height: 100vh; place-items: center; overflow: hidden; background: radial-gradient(circle at 54% 44%, #fff 0 23%, #fbf9f6 60%); }
.paper-composition { position: relative; width: min(66vw, 1480px); min-width: 1000px; height: min(77vh, 1010px); min-height: 760px; margin: -4.8vh 0 1vh 15vw; filter: drop-shadow(0 19px 13px rgba(32, 30, 25, .15)); }
.envelope-back { position: absolute; top: 1%; left: 16%; width: 58%; height: 23%; background: linear-gradient(145deg, #c9c7c3, #efedeb 50%, #b7b5b0); clip-path: polygon(0 100%, 50% 0, 100% 78%, 58% 48%, 50% 57%, 43% 48%); opacity: .92; }
.paper-sheet { position: absolute; inset: 9% 4% 3% 15%; z-index: 3; padding: 8.6% 10.4% 7%; overflow: hidden; background: linear-gradient(120deg, #fffefa 0%, #fbfaf6 48%, #f7f5ef 100%); box-shadow: 0 13px 12px rgba(31, 29, 25, .17); clip-path: polygon(0 0, 91% 0, 100% 11%, 96.5% 24%, 100% 39%, 96.5% 53%, 100% 66%, 97% 80%, 100% 100%, 18% 98%, 0 84%); }
.torn-paper { position: absolute; z-index: 1; background: #e35d2f; box-shadow: 0 10px 10px rgba(35, 31, 25, .13); }
.torn-left { top: 40%; left: 8%; width: 20%; height: 52%; clip-path: polygon(36% 0, 62% 8%, 48% 18%, 75% 28%, 59% 39%, 92% 50%, 58% 60%, 78% 78%, 44% 100%, 0 86%, 17% 59%, 0 38%, 19% 17%); }
.torn-left::after { position: absolute; right: -1%; bottom: -2%; width: 93%; height: 46%; content: ""; background: #457e6b; clip-path: polygon(22% 0, 100% 35%, 88% 100%, 0 79%); }
.torn-bottom { right: 8%; bottom: 2%; width: 34%; height: 18%; background: #f2bc33; clip-path: polygon(0 36%, 24% 0, 100% 40%, 82% 100%, 16% 82%); opacity: .7; }
.fold { position: absolute; z-index: 4; background: linear-gradient(142deg, #e9e7e2, #fffefa 67%); box-shadow: -4px 4px 7px rgba(39, 36, 30, .08); }
.fold-top-left { top: 0; left: 0; width: 12%; height: 12%; clip-path: polygon(0 0,100% 0,0 100%); }
.fold-top-right { top: 0; right: 0; width: 17%; height: 17%; background: linear-gradient(45deg, #e35d2f 0 38%, #fffefa 39% 65%, #e1dfda 66%); clip-path: polygon(0 0,100% 0,100% 100%); }
.fold-bottom-left { bottom: 0; left: 0; width: 22%; height: 18%; clip-path: polygon(0 0,100% 100%,0 100%); }
.stitched-line { position: absolute; z-index: 5; width: 2px; height: 18%; border-left: 2px dashed #282826; opacity: .83; }
.stitch-left { top: 12%; left: 2.2%; }.stitch-right { top: 21%; right: 3.1%; height: 65%; }
.sticky-note { position: absolute; z-index: 7; width: 5.2%; aspect-ratio: 1; background: #f2bc33; box-shadow: 2px 3px 5px rgba(30, 28, 24, .15); }
.note-left { top: 31%; left: -.8%; transform: rotate(12deg); }.note-right { top: 43%; right: -.5%; transform: rotate(-23deg); }
.tape { position: absolute; z-index: 7; right: 0; bottom: 25%; width: 13%; height: 5%; background: rgba(162, 165, 162, .65); transform: rotate(27deg); }
.paperclip { position: absolute; z-index: 8; top: 8%; right: 1.7%; width: 3.4%; height: 20%; border: 4px solid #202120; border-radius: 42% 42% 48% 48%; transform: rotate(-32deg); }.paperclip::after { position: absolute; top: 13%; left: 26%; width: 43%; height: 78%; content: ""; border: 3px solid #202120; border-radius: 48%; }
.ink-loop { position: absolute; z-index: 7; border-top: 3px solid #1c1e1d; border-radius: 50%; }.loop-top { top: 19%; right: 18%; width: 7%; height: 3%; transform: rotate(-16deg); }.loop-bottom { right: 6%; bottom: 2%; width: 24%; height: 8%; transform: rotate(-4deg); }
.login-title { position: relative; display: flex; align-items: center; gap: 17px; }.login-title h1 { margin: 0; font-size: clamp(30px, 2.5vw, 49px); font-weight: 800; letter-spacing: 1px; white-space: nowrap; }.paper-plane { width: 50px; flex: 0 0 50px; fill: #e35d2f; stroke: #fffefa; stroke-width: 2; }.title-underline { position: absolute; bottom: -19px; left: 90px; width: 67%; height: 3px; background: repeating-linear-gradient(90deg, #e35d2f 0 29px, transparent 29px 36px); }
.login-form { display: grid; gap: 22px; margin-top: 9.3%; }.form-row { display: grid; grid-template-columns: 190px minmax(300px, 1fr); align-items: center; gap: 12px; }.row-label { display: flex; align-items: center; gap: 13px; font-size: 18px; font-weight: 700; white-space: nowrap; }.row-label svg { width: 27px; height: 27px; fill: none; stroke: #1c1e1d; stroke-width: 2; }.row-label svg circle { fill: #1c1e1d; }
.input-shell { display: block; min-height: 67px; padding: 0 18px; border: 2px solid #2a2b2a; background: rgba(255,255,255,.25); clip-path: polygon(12px 0,100% 0,100% calc(100% - 10px),calc(100% - 12px) 100%,0 100%,0 12px); }.input-shell:focus-within { border-color: #e35d2f; box-shadow: 3px 3px 0 rgba(227,93,47,.16); }.input-shell input { width: 100%; height: 63px; border: 0; outline: 0; color: #1c1e1d; background: transparent; font-size: 17px; font-weight: 600; }.input-shell input::placeholder { color: #a3a7a5; }.password-shell { position: relative; padding-right: 61px; }.eye-button { position: absolute; top: 0; right: 0; width: 59px; height: 63px; border: 0; color: #1c1e1d; background: transparent; }.eye-button svg { width: 27px; height: 27px; fill: none; stroke: currentColor; stroke-width: 2; }
.captcha-controls { display: grid; grid-template-columns: minmax(165px, 1fr) 150px 87px; align-items: center; gap: 16px; }.captcha-input { min-width: 165px; }.captcha-canvas { width: 150px; height: 67px; border: 1px solid #d6d2cb; background: #fffefa; cursor: pointer; }.refresh-button { display: inline-flex; align-items: center; gap: 6px; border: 0; color: #1c1e1d; background: transparent; font-size: 16px; font-weight: 700; }.refresh-button svg { width: 27px; height: 27px; fill: none; stroke: currentColor; stroke-width: 2; }
.form-options { display: flex; align-items: center; justify-content: space-between; margin: 5px 0 8px 202px; }.remember-option { display: flex; align-items: center; gap: 12px; font-size: 17px; font-weight: 700; }.remember-option input { appearance: none; width: 29px; height: 29px; margin: 0; border: 2px solid #e35d2f; background: #fffefa; }.remember-option input:checked { background: #e35d2f; box-shadow: inset 0 0 0 4px #fffefa; }.remember-option input:checked::after { content: "✓"; color: #fff; }.forgot-password { border: 0; border-bottom: 2px solid #1c1e1d; padding: 0 0 3px; color: #1c1e1d; background: transparent; font-size: 17px; font-weight: 700; }
.submit-button { display: flex; align-items: center; justify-content: center; gap: 19px; min-height: 102px; margin-left: 202px; border: 0; color: #fffefa; background: linear-gradient(137deg,#e35d2f,#ef6a28); box-shadow: 7px 7px 0 rgba(78,64,52,.18); font-size: 32px; font-weight: 800; letter-spacing: 3px; clip-path: polygon(15px 0,100% 0,100% calc(100% - 17px),calc(100% - 17px) 100%,0 100%,0 15px); }.submit-button:hover { background: #d94f23; transform: translateY(-1px); }.submit-button span { font-size: 30px; transform: rotate(18deg); }.form-message { min-height: 20px; margin: -10px 0 0 202px; color: #d1413a; font-size: 14px; font-weight: 700; text-align: center; }
.policy { position: absolute; bottom: 5.5vh; left: 50%; display: flex; align-items: center; gap: 7px; margin: 0; transform: translateX(-14%); color: #898d8b; font-size: 16px; }.policy svg { width: 24px; height: 24px; fill: #898d8b; stroke: #fff; stroke-width: 1.5; }.policy button { border: 0; border-bottom: 1px solid #e35d2f; padding: 0; color: #e35d2f; background: transparent; font-size: 16px; }
.toast { position: fixed; bottom: 30px; left: 50%; z-index: 10; padding: 12px 18px; transform: translate(-50%,130px); color: #fff; background: #1c1e1d; box-shadow: 0 12px 26px rgba(28,30,29,.16); font-size: 14px; opacity: 0; transition: .24s ease; }.toast.is-visible { transform: translate(-50%,0); opacity: 1; }
@media (max-width: 1280px) { .paper-composition { margin-left: 7vw; }.paper-sheet { padding-left: 9%; padding-right: 8%; }.form-row { grid-template-columns: 160px minmax(280px,1fr); }.form-options,.submit-button,.form-message { margin-left: 172px; }.row-label { font-size: 16px; }.login-form { gap: 17px; }.input-shell { min-height: 58px; }.input-shell input,.eye-button { height: 54px; }.submit-button { min-height: 86px; font-size: 28px; } }