/* 登录页 — 居中卡片 · 浅色化工风（适度层次，不过于素淡或浓艳） */

:root {
    --chem-primary: #1a7a8a;
    --chem-primary-hover: #156570;
    --chem-primary-soft: #e8f4f6;
    --chem-accent: #3a9aad;
    --chem-bg-top: #d8e4ee;
    --chem-bg-bottom: #c9d9e6;
    --chem-card: #ffffff;
    --chem-text: #1e293b;
    --chem-text-secondary: #475569;
    --chem-text-muted: #64748b;
    --chem-border: #cbd5e1;
    --chem-input-bg: #f1f5f9;
    --chem-radius: 14px;
}

* {
    box-sizing: border-box;
}

html, body {
    height: 100%;
    margin: 0;
}

body.login-page {
    min-height: 100vh;
    font-family: "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
    background: #c5d5e3;
    color: var(--chem-text);
    overflow-x: hidden;
}

/* ---- 化工背景 ---- */
.login-bg {
    position: fixed;
    inset: 0;
    z-index: 0;
    pointer-events: none;
    overflow: hidden;
}

.login-bg__base {
    position: absolute;
    inset: 0;
    background:
        radial-gradient(ellipse 55% 45% at 12% 18%, rgba(58, 154, 173, 0.22) 0%, transparent 55%),
        radial-gradient(ellipse 45% 40% at 88% 82%, rgba(26, 122, 138, 0.18) 0%, transparent 50%),
        radial-gradient(ellipse 60% 50% at 50% 100%, rgba(100, 140, 170, 0.15) 0%, transparent 45%),
        linear-gradient(155deg, #d4e2ed 0%, #bccedd 35%, #b8cfde 65%, #c8dae6 100%);
}

.login-bg__hex-grid {
    position: absolute;
    inset: -20%;
    opacity: 0.35;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='56' height='100' viewBox='0 0 56 100'%3E%3Cpath d='M28 0L56 16v32L28 64 0 48V16z M28 64l28 16v32L28 128 0 112V80z' fill='none' stroke='%231a7a8a' stroke-width='0.6' opacity='0.35'/%3E%3C/svg%3E");
    background-size: 56px 100px;
    mask-image: radial-gradient(ellipse 75% 70% at 50% 50%, black 15%, transparent 72%);
}

.login-bg__pipes {
    position: absolute;
    inset: 0;
    opacity: 0.12;
    background:
        repeating-linear-gradient(
            -35deg,
            transparent,
            transparent 80px,
            rgba(26, 122, 138, 0.5) 80px,
            rgba(26, 122, 138, 0.5) 82px
        ),
        repeating-linear-gradient(
            55deg,
            transparent,
            transparent 120px,
            rgba(30, 90, 110, 0.35) 120px,
            rgba(30, 90, 110, 0.35) 121px
        );
}

.login-bg__glow {
    position: absolute;
    border-radius: 50%;
    filter: blur(60px);
    animation: login-glow-drift 20s ease-in-out infinite alternate;
}

.login-bg__glow--a {
    width: 360px;
    height: 360px;
    top: -8%;
    right: 5%;
    background: rgba(58, 154, 173, 0.25);
}

.login-bg__glow--b {
    width: 300px;
    height: 300px;
    bottom: -5%;
    left: 0;
    background: rgba(26, 122, 138, 0.2);
    animation-delay: -10s;
}

@keyframes login-glow-drift {
    from { transform: translate(0, 0); }
    to   { transform: translate(20px, 15px); }
}

.login-bg__mol {
    position: absolute;
    color: rgba(26, 122, 138, 0.2);
    pointer-events: none;
}

.login-bg__mol--left {
    width: min(38vw, 280px);
    left: 4%;
    top: 50%;
    animation: login-mol-float-left 16s ease-in-out infinite alternate;
}

.login-bg__mol--right {
    width: min(32vw, 220px);
    right: 6%;
    top: 18%;
    color: rgba(26, 122, 138, 0.16);
    animation: login-mol-float-right 14s ease-in-out infinite alternate-reverse;
}

@keyframes login-mol-float-left {
    from { transform: translateY(-50%) rotate(0deg); }
    to   { transform: translateY(calc(-50% - 12px)) rotate(2deg); }
}

@keyframes login-mol-float-right {
    from { transform: translateY(0) rotate(0deg); }
    to   { transform: translateY(-10px) rotate(-2deg); }
}

/* 分子链节点 */
.login-bg__chain {
    position: absolute;
    width: 180px;
    height: 140px;
    bottom: 12%;
    right: 14%;
    opacity: 0.35;
}

.login-bg__chain span {
    position: absolute;
    display: block;
    border-radius: 50%;
    border: 1.5px solid rgba(26, 122, 138, 0.45);
    background: rgba(232, 244, 246, 0.7);
}

.login-bg__chain span:nth-child(1) { width: 16px; height: 16px; top: 20%; left: 10%; }
.login-bg__chain span:nth-child(2) { width: 12px; height: 12px; top: 45%; left: 35%; }
.login-bg__chain span:nth-child(3) { width: 18px; height: 18px; top: 15%; left: 55%; }
.login-bg__chain span:nth-child(4) { width: 14px; height: 14px; bottom: 15%; right: 20%; }

.login-bg__chain i {
    position: absolute;
    display: block;
    height: 1px;
    background: rgba(26, 122, 138, 0.35);
    transform-origin: left center;
}

.login-bg__chain i:nth-child(5) { width: 52px; top: 28%; left: 16%; transform: rotate(25deg); }
.login-bg__chain i:nth-child(6) { width: 48px; top: 32%; left: 38%; transform: rotate(-15deg); }
.login-bg__chain i:nth-child(7) { width: 56px; top: 38%; left: 52%; transform: rotate(35deg); }

/* 化工图标装饰 */
.login-bg__deco {
    position: absolute;
    font-size: 2.5rem;
    color: rgba(26, 122, 138, 0.12);
    pointer-events: none;
}

.login-bg__deco.mdi-flask-outline {
    top: 10%;
    left: 12%;
    font-size: 3rem;
    transform: rotate(-12deg);
}

.login-bg__deco.mdi-test-tube {
    bottom: 18%;
    left: 8%;
    font-size: 2.25rem;
    transform: rotate(18deg);
}

.login-bg__deco.mdi-molecule {
    top: 22%;
    right: 10%;
    font-size: 3.5rem;
    opacity: 0.85;
}

.login-bg__deco.mdi-barrel {
    bottom: 10%;
    right: 22%;
    font-size: 2.75rem;
    transform: rotate(8deg);
}

/* 卡片区域留白，背景元素在中间略淡 */
.login-bg::after {
    content: "";
    position: absolute;
    top: 50%;
    left: 50%;
    width: min(92vw, 520px);
    height: 85vh;
    transform: translate(-50%, -50%);
    background: radial-gradient(ellipse at center, rgba(212, 226, 237, 0.55) 0%, transparent 68%);
}

/* ---- 居中布局 ---- */
.login-main {
    position: relative;
    z-index: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    padding: 32px 20px;
}

.login-box {
    position: relative;
    z-index: 2;
    width: min(100%, 420px);
    background: var(--chem-card);
    border-radius: var(--chem-radius);
    border: 1px solid rgba(255, 255, 255, 0.8);
    box-shadow:
        0 0 0 1px rgba(26, 122, 138, 0.06),
        0 8px 24px rgba(30, 41, 59, 0.1),
        0 24px 48px rgba(26, 122, 138, 0.08);
    overflow: hidden;
}

/* ---- 品牌区 ---- */
.login-brand {
    position: relative;
    padding: 36px 32px 28px;
    text-align: center;
    background: linear-gradient(180deg, #f0f7fa 0%, #fff 100%);
    border-bottom: 1px solid #e2e8f0;
}

.login-brand::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, #1a7a8a, #3a9aad, #5eb8c9);
}

.login-brand__logo {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 52px;
    height: 52px;
    margin-bottom: 16px;
    border-radius: 12px;
    background: var(--chem-primary-soft);
    border: 1px solid rgba(26, 122, 138, 0.18);
    box-shadow: 0 4px 12px rgba(26, 122, 138, 0.1);
}

.login-brand__logo img.logo {
    width: 30px;
    height: 30px;
    object-fit: contain;
}

.login-brand__fallback {
    display: none;
    align-items: center;
    justify-content: center;
    font-size: 1.625rem;
    color: var(--chem-primary);
}

.login-brand__name {
    margin: 0 0 8px;
    font-size: 1.1875rem;
    font-weight: 600;
    line-height: 1.45;
    color: var(--chem-text);
}

.login-brand__tag {
    display: inline-block;
    margin: 0;
    padding: 4px 14px;
    border-radius: 999px;
    background: var(--chem-primary-soft);
    border: 1px solid rgba(26, 122, 138, 0.15);
    font-size: 0.75rem;
    font-weight: 500;
    letter-spacing: 0.12em;
    color: var(--chem-primary);
}

.login-brand__version {
    display: block;
    margin-top: 12px;
    font-size: 0.6875rem;
    color: var(--chem-text-muted);
}

/* ---- 表单区 ---- */
.login-box__body {
    padding: 28px 32px 8px;
}

.login-debug-banner {
    margin-bottom: 16px;
    padding: 8px 12px;
    border-radius: 8px;
    background: #fffbeb;
    border: 1px solid #fde68a;
    color: #b45309;
    font-size: 0.8125rem;
    text-align:center;
}

.signin-form {
    display: flex;
    flex-direction: column;
    gap: 18px;
}

.login-field {
    margin: 0;
}

.login-field__label {
    display: block;
    margin-bottom: 6px;
    font-size: 0.8125rem;
    font-weight: 500;
    color: var(--chem-text-secondary);
}

.login-field__wrap {
    position: relative;
}

.login-field__wrap .mdi {
    position: absolute;
    left: 13px;
    top: 50%;
    transform: translateY(-50%);
    font-size: 1.125rem;
    color: var(--chem-text-muted);
    pointer-events: none;
    transition: color 0.15s;
}

.login-field__wrap .form-control {
    width: 100%;
    height: 44px;
    padding: 0 14px 0 40px;
    border: 1px solid var(--chem-border);
    border-radius: 8px;
    background: var(--chem-input-bg);
    color: var(--chem-text);
    font-size: 0.875rem;
    transition: border-color 0.15s, box-shadow 0.15s, background 0.15s;
}

.login-field__wrap .form-control::placeholder {
    color: #94a3b8;
}

.login-field__wrap .form-control:focus {
    border-color: var(--chem-accent);
    background: #fff;
    box-shadow: 0 0 0 3px rgba(26, 122, 138, 0.14);
    outline: none;
}

.login-field__wrap:focus-within .mdi {
    color: var(--chem-primary);
}

.signin-form .btn-login {
    width: 100%;
    height: 44px;
    margin-top: 4px;
    border: none;
    border-radius: 8px;
    background: var(--chem-primary);
    color: #fff;
    font-size: 0.9375rem;
    font-weight: 500;
    letter-spacing: 0.08em;
    cursor: pointer;
    transition: background 0.15s, box-shadow 0.15s, transform 0.15s;
    box-shadow: 0 4px 12px rgba(26, 122, 138, 0.28);
}

.signin-form .btn-login:hover:not(:disabled) {
    background: var(--chem-primary-hover);
    box-shadow: 0 6px 16px rgba(26, 122, 138, 0.32);
    transform: translateY(-1px);
}

.signin-form .btn-login:active:not(:disabled) {
    transform: translateY(0);
}

.signin-form .btn-login:disabled {
    opacity: 0.65;
    cursor: not-allowed;
}

.login-box__extras {
    display: flex;
    justify-content: center;
}

.login-box__extras .forget {
    font-size: 0.8125rem;
    color: var(--chem-text-muted);
    text-decoration: none;
}

.login-box__extras .forget:hover {
    color: var(--chem-primary);
}

.signin-form.was-validated .form-control:invalid {
    border-color: #e57373;
}

.login-box__copy {
    margin: 0;
    padding: 16px 32px 22px;
    text-align: center;
    font-size: 0.6875rem;
    color: var(--chem-text-muted);
    background: #fafbfc;
    border-top: 1px solid #eef2f6;
}

@media (max-width: 768px) {
    .login-bg__mol--left,
    .login-bg__mol--right {
        opacity: 0.5;
    }

    .login-bg__mol--left {
        width: 160px;
        left: -4%;
    }

    .login-bg__mol--right {
        width: 140px;
        right: -4%;
        top: 8%;
    }

    .login-bg__deco.mdi-barrel,
    .login-bg__deco.mdi-test-tube {
        display: none;
    }

    .login-bg__chain {
        right: 4%;
        bottom: 8%;
        transform: scale(0.75);
    }
}

@media (max-width: 480px) {
    .login-main {
        padding: 24px 16px;
    }

    .login-brand {
        padding: 28px 24px 22px;
    }

    .login-box__body {
        padding: 24px 24px 4px;
    }

    .login-box__copy {
        padding: 14px 24px 18px;
    }
}