/* ============================================================
   KOP-SQL 登录/注册页 - 白色科技风
   与平台内部 OceanTech 主题（theme-oceantech.css）保持统一
   ============================================================ */
html, body { height:100%; }

body.login-page {
  margin:0;
  min-height:100%;
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;
  color:#0f172a;
  display:flex;
  flex-direction:column;
  align-items:center;
  position:relative;
  overflow-y:auto;
  padding:28px 0;
  box-sizing:border-box;
  background:
    radial-gradient(640px 360px at 12% 10%, rgba(29,78,216,.10), transparent 62%),
    radial-gradient(720px 420px at 88% 86%, rgba(6,182,212,.08), transparent 62%),
    linear-gradient(160deg,#ffffff 0%,#f2f6fb 55%,#e8eef7 100%);
}

/* 背景网格纹理 */
body.login-page::before {
  content:"";
  position:absolute; inset:0;
  background-image:
    linear-gradient(rgba(15,43,70,.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(15,43,70,.04) 1px, transparent 1px);
  background-size:46px 46px;
  pointer-events:none;
  z-index:0;
}

/* 顶部品牌区 */
.login-top {
  position:relative; z-index:1;
  display:flex; align-items:center; gap:12px;
  margin-top:auto; margin-bottom:28px;
  user-select:none;
}
.login-top .brand-logo {
  width:46px; height:46px; border-radius:12px;
  background:linear-gradient(135deg,#1d4ed8,#06b6d4);
  display:flex; align-items:center; justify-content:center;
  box-shadow:0 6px 18px rgba(29,78,216,.45);
}
.login-top .brand-logo svg { width:30px; height:30px; }
.login-top .brand-name b {
  display:block; font-size:22px; font-weight:700; letter-spacing:.5px; color:#0f172a;
}
.login-top .brand-name small {
  display:block; font-size:12px; color:#64748b; letter-spacing:2px; margin-top:2px;
}

/* 登录/注册卡片 */
.login-box {
  position:relative; z-index:1;
  width:390px; max-width:92vw;
  padding:36px 34px 30px;
  background:rgba(255,255,255,.94);
  border:1px solid #e5e7eb;
  border-radius:16px;
  box-shadow:0 24px 70px rgba(15,43,70,.14);
  box-sizing:border-box;
}
.login-box h1 {
  margin:0 0 26px; font-size:20px; font-weight:700; color:#0f172a; text-align:center;
}
.login-sub {
  margin:0 0 26px; font-size:13px; color:#64748b; text-align:center; letter-spacing:1px;
}

/* 输入框 */
.field { position:relative; margin-bottom:16px; }
.field i {
  position:absolute; left:13px; top:50%; transform:translateY(-50%);
  color:#94a3b8; font-size:14px;
}
.field input {
  width:100%; height:44px; box-sizing:border-box;
  padding:0 14px 0 38px;
  background:#ffffff;
  border:1px solid #d7dfe9;
  border-radius:9px;
  color:#0f172a; font-size:14px; outline:none;
  transition:border-color .15s, box-shadow .15s, background .15s;
}
.field input::placeholder { color:#94a3b8; }
.field input:focus {
  border-color:#06b6d4;
  box-shadow:0 0 0 3px rgba(6,182,212,.15);
}

/* 字段下方行内错误提示（注册失败信息） */
.field-err {
  display:none; margin:-8px 0 12px 0; padding-left:38px;
  color:#d93025; font-size:12px; line-height:1.5;
}
.field-err.show { display:block; }

/* 验证码行 */
.code-group { display:flex; gap:10px; }
.code-group .field { flex:1; margin-bottom:0; }
.code-group .btn-code {
  flex-shrink:0; height:44px; padding:0 14px;
  background:#f0f7ff;
  border:1px solid #bfdbfe;
  border-radius:9px; color:#1d4ed8; font-size:13px; cursor:pointer;
  transition:all .15s;
}
.code-group .btn-code:hover { background:#dbeafe; }
.code-group .btn-code:disabled { opacity:.55; cursor:not-allowed; }

/* 按钮 */
.login-btns { display:flex; gap:12px; margin-top:26px; }
.login-btns input {
  flex:1; height:44px; border:none; border-radius:9px;
  font-size:15px; cursor:pointer; letter-spacing:2px;
  transition:all .15s;
}
.btn-primary {
  background:linear-gradient(135deg,#1d4ed8,#06b6d4); color:#fff;
  box-shadow:0 8px 20px rgba(29,78,216,.35);
}
.btn-primary:hover { filter:brightness(1.12); }
.btn-ghost {
  background:#f0f7ff; color:#1d4ed8;
  border:1px solid #bfdbfe !important;
}
.btn-ghost:hover { background:#dbeafe; }

/* 底部版权 */
.login-foot {
  position:relative; z-index:1;
  margin-top:28px; margin-bottom:auto; font-size:12px; color:#94a3b8; letter-spacing:.5px;
}

/* 右上角"首页"入口 */
.page-home {
  position:absolute; top:22px; right:26px; z-index:2;
  padding:8px 18px; font-size:13px; line-height:1; text-decoration:none;
  color:#1d4ed8; background:#f0f7ff; border:1px solid #bfdbfe; border-radius:9px;
  transition:background .15s;
}
.page-home:hover { background:#dbeafe; }

/* ============================================================
   登录页（两栏布局，选项1）——仅作用于 body.login-page.login-split
   左侧深色视觉区 + 右侧表单卡片；注册页 signup.html 不受影响
   ============================================================ */
body.login-page.login-split {
  display:block;
  padding:0;
  overflow:hidden;
  background:#eef2f6;
}
body.login-page.login-split::before { display:none; }

.login-split .login-shell {
  display:grid;
  grid-template-columns:minmax(0,1fr) 460px;
  height:100vh;
  min-height:100vh;
  overflow:hidden;
}

/* 左侧视觉区 */
.login-split .visual-panel {
  position:relative;
  display:flex;
  flex-direction:column;
  justify-content:space-between;
  padding:52px 56px 48px;
  color:#334155;
  overflow:hidden;
  background:
    radial-gradient(720px 520px at 15% 12%, rgba(29,78,216,.10), transparent 62%),
    radial-gradient(760px 560px at 92% 88%, rgba(6,182,212,.10), transparent 64%),
    linear-gradient(135deg,#f4f8fc 0%,#e8f0f9 58%,#eef4fa 100%);
  border-right:1px solid #e2e8ef;
}
.login-split .visual-panel::before {
  content:"";
  position:absolute; inset:0;
  background-image:
    linear-gradient(rgba(15,43,70,.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(15,43,70,.05) 1px, transparent 1px);
  background-size:52px 52px;
  pointer-events:none;
}
.login-split .visual-panel > * { position:relative; z-index:1; }

.login-split .visual-brand { display:flex; align-items:center; gap:12px; }
.login-split .visual-brand .brand-logo {
  width:46px; height:46px; border-radius:12px;
  display:flex; align-items:center; justify-content:center;
  background:linear-gradient(135deg,#1d4ed8,#06b6d4);
  box-shadow:0 8px 22px rgba(29,78,216,.45);
}
.login-split .visual-brand .brand-name b {
  display:block; font-size:20px; font-weight:700; letter-spacing:.5px; color:#0f172a;
}
.login-split .visual-brand .brand-name small {
  display:block; font-size:12px; color:#64748b; letter-spacing:2px; margin-top:2px;
}

.login-split .visual-copy { max-width:540px; margin:auto 0; padding:40px 0; }
.login-split .visual-copy h2 {
  margin:0 0 16px; font-size:30px; line-height:1.34; font-weight:700;
  letter-spacing:.5px; color:#0f172a;
}
.login-split .visual-copy p {
  margin:0 0 24px; font-size:15px; line-height:1.85; color:#475569;
}
.login-split .visual-points {
  list-style:none; margin:0; padding:0;
  display:flex; flex-direction:column; gap:12px;
}
.login-split .visual-points li {
  position:relative; padding-left:26px; font-size:14px; color:#334155;
}
.login-split .visual-points li::before {
  content:""; position:absolute; left:0; top:6px;
  width:8px; height:8px; border-radius:50%;
  background:linear-gradient(135deg,#22d3ee,#38bdf8);
  box-shadow:0 0 0 4px rgba(56,189,248,.16);
}

/* 右侧表单区 */
.login-split .form-panel {
  position:relative;
  display:flex; flex-direction:column;
  justify-content:center; align-items:center;
  padding:40px 44px;
  overflow-y:auto;
  background:linear-gradient(#fbfdfd,#f4f7f8);
}
.login-split .page-home {
  position:absolute; top:22px; right:26px; z-index:2;
}
.login-split .login-box {
  width:100%; max-width:400px;
  padding:0; background:transparent; border:none; box-shadow:none;
}
.login-split .login-head { text-align:center; margin-bottom:26px; }
.login-split .login-head .head-logo {
  display:inline-flex; align-items:center; justify-content:center;
  width:52px; height:52px; border-radius:14px; margin-bottom:14px;
  background:linear-gradient(135deg,rgba(29,78,216,.12),rgba(6,182,212,.12));
}
.login-split .login-head h1 {
  margin:0; font-size:22px; font-weight:700; color:#0f172a; text-align:center;
}
.login-split .login-head .login-sub {
  margin:8px 0 0; font-size:13px; color:#64748b; letter-spacing:.5px;
}

.login-split .login-tabs {
  display:flex; margin-bottom:20px; border-bottom:1px solid #e5e7eb;
}
.login-split .login-tab {
  flex:1; text-align:center; padding:10px 0; cursor:pointer;
  font-size:14px; color:#94a3b8; border-bottom:2px solid transparent;
  margin-bottom:-1px; transition:color .15s,border-color .15s;
}
.login-split .login-tab:hover { color:#1d4ed8; }
.login-split .login-tab.active {
  color:#1d4ed8; border-bottom-color:#1d4ed8; font-weight:600;
}

.login-split .field { position:relative; margin-bottom:16px; }
.login-split .field i {
  position:absolute; left:15px; top:50%; transform:translateY(-50%);
  color:#94a3b8; font-size:15px;
}
.login-split .field i.ic { display:flex; align-items:center; justify-content:center; width:18px; height:18px; }
.login-split .field i.ic svg { width:18px; height:18px; display:block; }
.login-split .field input {
  width:100%; height:48px; box-sizing:border-box;
  padding:0 16px 0 42px;
  background:#f9fbfc; border:1px solid #d9e1e6; border-radius:10px;
  color:#0f172a; font-size:15px; outline:none;
  transition:border-color .15s, box-shadow .15s, background .15s;
}
.login-split .field input::placeholder { color:#94a3b8; }
.login-split .field input:focus {
  background:#fff; border-color:#1d4ed8;
  box-shadow:0 0 0 3px rgba(29,78,216,.14);
}

.login-split .code-group { display:flex; gap:10px; }
.login-split .code-group .field { flex:1; margin-bottom:0; }
.login-split .code-group .btn-code {
  flex-shrink:0; height:48px; padding:0 16px;
  background:#eef4ff; border:1px solid #c7d9f7; border-radius:10px;
  color:#1d4ed8; font-size:13px; cursor:pointer; transition:all .15s;
}
.login-split .code-group .btn-code:hover { background:#dbeafe; }
.login-split .code-group .btn-code:disabled { opacity:.55; cursor:not-allowed; }

.login-split .login-btns { margin-top:22px; }
.login-split .login-btns input {
  width:100%; height:48px; border:none; border-radius:10px;
  font-size:15px; font-weight:600; letter-spacing:2px; cursor:pointer;
  color:#fff;
  background:linear-gradient(135deg,#1d4ed8,#06b6d4);
  box-shadow:0 10px 22px rgba(29,78,216,.30);
  transition:filter .15s;
}
.login-split .login-btns input:hover { filter:brightness(1.10); }

.login-split .login-signup {
  margin-top:16px; text-align:center; font-size:13px; color:#64748b;
}
.login-split .login-signup a {
  color:#1d4ed8; cursor:pointer; margin-left:4px; text-decoration:none;
}
.login-split .login-signup a:hover { text-decoration:underline; }

.login-split .field-err { padding-left:42px; }

.login-split .login-foot {
  margin-top:26px; font-size:12px; color:#94a3b8; letter-spacing:.5px;
}

/* 窄屏：隐藏左侧视觉区，表单占满 */
@media (max-width:980px) {
  .login-split .login-shell { grid-template-columns:minmax(0,1fr); }
  .login-split .visual-panel { display:none; }
  .login-split .form-panel { padding:28px 20px; }
}