:root {
  --h-ink:#1a1a1a;--h-sub:#6b6b6b;--h-hint:#a8a8a8;--h-line:#e8e8e8;
  --h-bg:#f7f6f4;--h-white:#ffffff;
  --h-orange:#E8651A;--h-orange-lt:#FDF0E8;--h-orange-md:#F5A470;
  --h-sage:#3D6B5C;--h-sage-lt:#EAF2EE;--h-r:10px;
  --red-100:#FCEBEB;--red-400:#D94F4F;--red-600:#A32D2D;
  --bg-page:var(--h-bg);--bg-surface:var(--h-white);--bg-subtle:var(--h-orange-lt);
  --text-primary:var(--h-ink);--text-secondary:var(--h-sub);--text-tertiary:var(--h-hint);
  --text-link:var(--h-orange);--text-danger:var(--red-600);--text-success:var(--h-sage);
  --border-light:var(--h-line);--border-default:var(--h-line);
  --border-strong:var(--h-orange-md);--border-focus:var(--h-orange);--border-danger:var(--red-400);
  --brand:var(--h-orange);--brand-hover:#d45917;--brand-soft:var(--h-orange-lt);--brand-border:var(--h-orange-md);
  --shadow-sm:0 2px 6px rgba(26,23,20,.06),0 1px 2px rgba(26,23,20,.03);
  --shadow-lg:0 8px 28px rgba(26,23,20,.12),0 3px 8px rgba(26,23,20,.05);
  --shadow-xl:0 16px 48px rgba(26,23,20,.16),0 6px 14px rgba(26,23,20,.07);
  --font-sans:system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
  --font-mono:Consolas,"Liberation Mono",Menlo,Courier,monospace;
  --ease-out:cubic-bezier(.16,1,.3,1);
  --dur-fast:120ms;--dur-base:200ms;
}

[data-theme="dark"] {
  --bg-page:#161310;--bg-surface:#1E1A16;--bg-subtle:#1A1610;
  --text-primary:#EDE8DC;--text-secondary:#A89E90;--text-tertiary:#6B6358;
  --text-link:var(--h-orange-md);--text-danger:#F09595;--text-success:var(--h-sage-lt);
  --border-light:rgba(255,248,235,.07);--border-default:rgba(255,248,235,.13);
  --border-strong:rgba(255,248,235,.22);
  --brand-soft:rgba(232,101,26,.12);--brand-border:rgba(232,101,26,.25);
  --shadow-sm:0 2px 6px rgba(0,0,0,.28),0 1px 2px rgba(0,0,0,.15);
  --shadow-lg:0 8px 28px rgba(0,0,0,.45),0 3px 8px rgba(0,0,0,.22);
  --shadow-xl:0 16px 48px rgba(0,0,0,.55),0 6px 14px rgba(0,0,0,.28);
}

*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{height:100%}
body{
  font-family:var(--font-sans);font-size:15px;line-height:1.6;
  color:var(--text-primary);background:var(--bg-page);
  -webkit-font-smoothing:antialiased;min-height:100vh;display:flex;
  transition:background .4s,color .3s;
}

/* ── Layout ── */
.login-wrap{display:flex;width:100%;min-height:100vh}

.login-left{
  flex:1;position:relative;overflow:hidden;
  display:flex;flex-direction:column;justify-content:center;align-items:center;
  background:var(--bg-subtle);border-right:1px solid var(--border-light);
}
.login-left-bg{position:absolute;inset:0;opacity:.12;pointer-events:none}

.login-left-content{
  position:relative;z-index:1;
  max-width:420px;padding:40px 32px;text-align:center;
}
.brand-logo{
  font-size:24px;font-weight:700;color:var(--text-primary);
  margin-bottom:28px;display:flex;align-items:center;justify-content:center;gap:10px;
}

.hero-title{
  font-size:26px;font-weight:700;line-height:1.4;
  color:var(--text-primary);margin-bottom:14px;
}
.hero-desc{font-size:15px;color:var(--text-secondary);line-height:1.75;margin-bottom:28px}

.manuscript-preview{
  background:var(--bg-surface);border:1px solid var(--border-light);
  border-radius:16px;padding:24px;box-shadow:var(--shadow-lg);
  text-align:left;position:relative;overflow:hidden;
}
.manuscript-preview::before{
  content:'';position:absolute;inset:0;
  background-image:repeating-linear-gradient(transparent,transparent 31px,var(--border-light) 31px,var(--border-light) 32px);
  background-position:0 12px;opacity:.25;pointer-events:none;
}
.manuscript-meta{font-size:10px;font-family:var(--font-mono);color:var(--text-tertiary);margin-bottom:12px;position:relative}
.manuscript-text{font-size:15px;line-height:2.2;color:var(--text-primary);letter-spacing:.02em;position:relative}
.manuscript-cursor{
  display:inline-block;width:2px;height:.9em;background:var(--brand);
  vertical-align:text-bottom;animation:blink 1.1s step-end infinite;
}
@keyframes blink{0%,100%{opacity:1}50%{opacity:0}}
.manuscript-ai-tag{
  display:inline-flex;align-items:center;gap:3px;
  font-size:10px;font-weight:500;color:var(--h-sage);
  background:var(--h-sage-lt);border:1px solid rgba(61,107,92,.2);
  border-radius:4px;padding:2px 8px;margin-top:12px;position:relative;
}
[data-theme="dark"] .manuscript-ai-tag{color:var(--h-sage-lt);background:rgba(61,107,92,.15)}
.feature-pills{display:flex;gap:8px;flex-wrap:wrap;justify-content:center;margin-top:24px}
.feature-pill{
  font-size:11px;padding:4px 12px;border-radius:9999px;
  border:1px solid var(--border-light);color:var(--text-tertiary);background:var(--bg-surface);
}
.feature-pill.hl{background:var(--brand-soft);border-color:var(--brand-border);color:var(--text-link)}

/* ── Right: Form ── */
.login-right{
  width:480px;flex-shrink:0;display:flex;flex-direction:column;
  justify-content:center;align-items:center;padding:40px 32px;
  position:relative;
}
[data-theme="dark"] .login-right::before{
  content:'';position:absolute;top:-60px;left:50%;transform:translateX(-50%);
  width:300px;height:180px;
  background:radial-gradient(ellipse at 50% 0%,rgba(245,196,64,.1),transparent 70%);
  pointer-events:none;
}

.login-form-container{width:100%;max-width:360px;position:relative;z-index:1}

.theme-toggle{
  position:absolute;top:20px;right:20px;
  width:36px;height:36px;border-radius:var(--h-r);
  background:var(--bg-subtle);border:1px solid var(--border-light);
  cursor:pointer;display:flex;align-items:center;justify-content:center;
  font-size:15px;color:var(--text-secondary);z-index:10;
  transition:background var(--dur-fast);
}
.theme-toggle:hover{background:var(--border-light)}

/* Mobile brand */
.mobile-brand{
  display:none;font-size:20px;font-weight:700;color:var(--text-primary);
  margin-bottom:24px;align-items:center;justify-content:center;gap:8px;
}

/* Form header */
.form-header{margin-bottom:32px}
.form-header h2{font-size:24px;font-weight:700;color:var(--text-primary);margin-bottom:6px}
.form-header p{font-size:14px;color:var(--text-secondary);line-height:1.6}

/* Input groups */
.input-group{margin-bottom:16px}
.input-label{display:block;font-size:12px;font-weight:500;color:var(--text-secondary);margin-bottom:6px}
.input-wrap{position:relative}
.input{
  width:100%;font-family:var(--font-sans);font-size:14px;
  color:var(--text-primary);background:var(--bg-surface);
  border:1px solid var(--border-default);border-radius:var(--h-r);
  padding:11px 13px;outline:none;
  transition:border-color var(--dur-fast),box-shadow var(--dur-fast),background var(--dur-fast);
}
.input::placeholder{color:var(--text-tertiary)}
.input:hover:not(:disabled){border-color:var(--border-strong)}
.input:focus{border-color:var(--border-focus);box-shadow:0 0 0 3px rgba(232,101,26,.14)}
.input.is-error{border-color:var(--border-danger);box-shadow:0 0 0 3px rgba(217,79,79,.1)}
.input-icon{
  position:absolute;left:12px;top:50%;transform:translateY(-50%);
  font-size:14px;color:var(--text-tertiary);pointer-events:none;
}
.has-icon-left .input{padding-left:38px}
.input-msg{font-size:12px;margin-top:5px}
.input-msg.err{color:var(--text-danger)}

/* Code input row */
.code-row{display:flex;gap:8px}
.code-row .input{flex:1;letter-spacing:.12em;font-size:16px;text-align:center}
.code-send-btn{
  flex-shrink:0;padding:11px 14px;
  border:1px solid var(--border-default);border-radius:var(--h-r);
  background:var(--bg-surface);color:var(--text-secondary);
  font-size:13px;font-family:var(--font-sans);cursor:pointer;white-space:nowrap;
  transition:all var(--dur-fast) var(--ease-out);
}
.code-send-btn:hover:not(:disabled){border-color:var(--border-strong);background:var(--bg-subtle);color:var(--text-primary)}
.code-send-btn:disabled{opacity:.5;cursor:not-allowed}

/* Steps indicator */
.steps-indicator{
  display:flex;align-items:center;gap:6px;
  margin-bottom:20px;
}
.step-dot{
  width:8px;height:8px;border-radius:50%;
  background:var(--border-light);transition:all var(--dur-base);
}
.step-dot.active{background:var(--brand);transform:scale(1.2)}
.step-dot.done{background:var(--h-sage)}
.step-line{flex:1;height:1px;background:var(--border-light);max-width:60px}

/* CTA button */
.btn-primary{
  width:100%;display:flex;align-items:center;justify-content:center;gap:8px;
  font-family:var(--font-sans);font-weight:500;font-size:15px;cursor:pointer;
  background:var(--brand);color:#fff;border:none;border-radius:var(--h-r);
  padding:13px 24px;margin-top:8px;
  box-shadow:0 2px 8px rgba(232,101,26,.35),inset 0 1px 0 rgba(255,255,255,.15);
  transition:all var(--dur-base) var(--ease-out);
}
.btn-primary:hover{background:var(--brand-hover);box-shadow:0 6px 18px rgba(232,101,26,.4);transform:translateY(-1px)}
.btn-primary:active{transform:translateY(0);box-shadow:0 1px 4px rgba(232,101,26,.3)}
.btn-primary.loading{opacity:.85;pointer-events:none}

/* Back link */
.back-link{
  display:inline-flex;align-items:center;gap:4px;
  font-size:13px;color:var(--text-tertiary);cursor:pointer;
  margin-bottom:12px;background:none;border:none;font-family:var(--font-sans);
  padding:0;transition:color var(--dur-fast);
}
.back-link:hover{color:var(--text-primary)}

/* Trust line */
.trust-line{
  margin-top:24px;text-align:center;font-size:12px;color:var(--text-tertiary);line-height:1.65;
}
.trust-line a{color:var(--text-link);text-decoration:none}
.trust-line a:hover{text-decoration:underline}

/* Spinner */
@keyframes spin{to{transform:rotate(360deg)}}
.spinner{
  width:16px;height:16px;border:2px solid rgba(255,255,255,.3);
  border-top-color:#fff;border-radius:50%;
  animation:spin .7s linear infinite;flex-shrink:0;
}

/* Toast */
@keyframes toastIn{from{opacity:0;transform:translateY(8px)}to{opacity:1;transform:translateY(0)}}
.toast{
  position:fixed;top:20px;right:20px;z-index:200;
  display:none;align-items:center;gap:12px;
  background:var(--bg-surface);border:1px solid var(--border-default);
  border-radius:12px;padding:10px 16px;
  box-shadow:var(--shadow-lg);font-size:13px;
  animation:toastIn .3s var(--ease-out) forwards;min-width:220px;
}
.toast.show{display:inline-flex}
.toast-icon{font-size:14px;flex-shrink:0}
.toast-msg{color:var(--text-primary)}

/* Step panels */
.step-panel{display:none}
.step-panel.active{display:block}

/* Login mode tabs */
.login-tabs{
  display:flex;gap:8px;margin-bottom:24px;
  background:var(--bg-subtle);border:1px solid var(--border-light);
  border-radius:10px;padding:4px;
}
.login-tab{
  flex:1;border:none;background:transparent;
  font-family:var(--font-sans);font-size:13px;font-weight:500;
  color:var(--text-secondary);padding:9px 12px;border-radius:8px;
  cursor:pointer;transition:all var(--dur-fast);
}
.login-tab.active{
  background:var(--bg-surface);color:var(--text-primary);
  box-shadow:var(--shadow-sm);
}
.login-mode-panel{display:none}
.login-mode-panel.active{display:block}

.btn-secondary{
  width:100%;display:flex;align-items:center;justify-content:center;
  font-family:var(--font-sans);font-weight:500;font-size:14px;cursor:pointer;
  background:var(--bg-surface);color:var(--text-primary);
  border:1px solid var(--border-default);border-radius:var(--h-r);
  padding:12px 24px;margin-top:8px;transition:all var(--dur-fast);
}
.btn-secondary:hover{border-color:var(--border-strong);background:var(--bg-subtle)}
.skip-link{
  display:block;width:100%;margin-top:12px;text-align:center;
  font-size:13px;color:var(--text-tertiary);background:none;border:none;
  cursor:pointer;font-family:var(--font-sans);
}
.skip-link:hover{color:var(--text-secondary)}

/* Beian */
.page-beian-footer{
  padding:16px 24px 20px;text-align:center;
  font-size:12px;color:var(--text-tertiary);
}
.page-beian-footer a{color:var(--text-tertiary);text-decoration:none}
.page-beian-footer a:hover{color:var(--text-secondary);text-decoration:underline}

/* Responsive */
@media(max-width:900px){
  .login-left{display:none}
  .login-right{width:100%;min-height:100vh}
  .mobile-brand{display:flex}
}
@media(max-width:480px){
  .login-right{padding:24px 20px}
}