:root {
    --green-50: #ecfdf5;
    --green-100: #d1fae5;
    --green-200: #a7f3d0;
    --green-400: #34d399;
    --green-500: #10b981;
    --green-600: #059669;
    --green-700: #047857;
    --green-800: #065f46;
    --gray-50: #f9fafb;
    --gray-100: #f3f4f6;
    --gray-200: #e5e7eb;
    --gray-300: #d1d5db;
    --gray-400: #9ca3af;
    --gray-500: #6b7280;
    --gray-600: #4b5563;
    --gray-700: #374151;
    --gray-800: #1f2937;
    --gray-900: #111827;
    --red-400: #f87171;
    --red-500: #ef4444;
    --red-50: #fef2f2;
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    --radius-xl: 20px;
    --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
    --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.07), 0 2px 4px -2px rgba(0,0,0,0.05);
    --shadow-lg: 0 10px 25px -3px rgba(0,0,0,0.08), 0 4px 10px -4px rgba(0,0,0,0.04);
    --shadow-xl: 0 20px 50px -6px rgba(0,0,0,0.1), 0 8px 20px -6px rgba(0,0,0,0.04);
    --transition: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    background: var(--gray-50);
    color: var(--gray-800);
    line-height: 1.5;
}

@media (min-width: 769px) {
    body {
        min-height: 100vh;
        padding: 0 !important;
        display: flex;
        background: radial-gradient(ellipse 80% 60% at 50% -20%, rgba(16,185,129,0.08) 0%, transparent 60%), radial-gradient(ellipse 60% 50% at 80% 80%, rgba(5,150,105,0.05) 0%, transparent 50%), var(--gray-50);
    }

    .page-wrapper {
        display: flex;
        width: 100%;
        min-height: 100vh;
    }

    .brand-panel {
        flex: 1;
        display: flex;
        flex-direction: column;
        justify-content: center;
        align-items: center;
        padding: 60px;
        position: relative;
        overflow: hidden;
        background: linear-gradient(160deg, #34d399 0%, #10b981 30%, #059669 60%, #047857 100%);
    }

        .brand-panel::before {
            content: '';
            position: absolute;
            inset: 0;
            background: radial-gradient(circle at 20% 30%, rgba(255,255,255,0.06) 0%, transparent 50%), radial-gradient(circle at 80% 70%, rgba(255,255,255,0.04) 0%, transparent 40%);
            pointer-events: none;
        }

    .brand-pattern {
        position: absolute;
        inset: 0;
        opacity: 0.04;
        background-image: repeating-linear-gradient(45deg, #fff 0px, #fff 1px, transparent 1px, transparent 30px), repeating-linear-gradient(-45deg, #fff 0px, #fff 1px, transparent 1px, transparent 30px);
        pointer-events: none;
    }

    .brand-ornament {
        position: absolute;
        border-radius: 50%;
        border: 1px solid rgba(255,255,255,0.08);
        pointer-events: none;
    }

    .brand-ornament-1 {
        width: 400px;
        height: 400px;
        top: -120px;
        right: -120px;
    }

    .brand-ornament-2 {
        width: 260px;
        height: 260px;
        bottom: -80px;
        left: -80px;
    }

    .brand-ornament-3 {
        width: 160px;
        height: 160px;
        top: 50%;
        left: 60%;
    }

    .brand-content {
        position: relative;
        z-index: 1;
        text-align: center;
        max-width: 420px;
    }

    .brand-icon {
        width: 64px;
        height: 64px;
        background: rgba(255,255,255,0.12);
        border-radius: var(--radius-lg);
        display: flex;
        align-items: center;
        justify-content: center;
        margin: 0 auto 28px;
        backdrop-filter: blur(10px);
        border: 1px solid rgba(255,255,255,0.15);
    }

        .brand-icon svg {
            width: 32px;
            height: 32px;
            fill: #fff;
        }

    .brand-content h1 {
        font-size: 36px;
        font-weight: 700;
        color: #fff;
        letter-spacing: 2px;
        margin-bottom: 12px;
        text-shadow: 0 1px 3px rgba(0,0,0,0.1);
    }

    .brand-content .brand-subtitle {
        font-size: 16px;
        color: rgba(255,255,255,0.85);
        letter-spacing: 4px;
        font-weight: 300;
        text-shadow: 0 1px 2px rgba(0,0,0,0.08);
    }

    .brand-content .brand-desc {
        font-size: 14px;
        color: rgba(255,255,255,0.55);
        margin-top: 28px;
        line-height: 1.8;
    }

    .brand-features {
        display: flex;
        gap: 32px;
        margin-top: 40px;
        position: relative;
        z-index: 1;
    }

    .brand-feature {
        text-align: center;
        color: rgba(255,255,255,0.7);
    }

        .brand-feature .feat-icon {
            width: 40px;
            height: 40px;
            margin: 0 auto 8px;
            background: rgba(255,255,255,0.1);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 18px;
        }

        .brand-feature span {
            font-size: 13px;
            letter-spacing: 1px;
        }

    .login-panel {
        flex: 1;
        display: flex;
        align-items: center;
        justify-content: center;
        padding: 40px;
        position: relative;
        max-width: 560px;
    }

    .login-panel-inner {
        width: 100%;
        max-width: 420px;
    }

    .login-header {
        text-align: left;
        margin-bottom: 36px;
    }

        .login-header .welcome {
            font-size: 28px;
            font-weight: 700;
            color: var(--gray-900);
            margin-bottom: 6px;
        }

        .login-header .welcome-sub {
            font-size: 14px;
            color: var(--gray-500);
        }

    .login-card {
        background: #fff;
        border-radius: var(--radius-xl);
        box-shadow: var(--shadow-xl);
        padding: 0;
        overflow: hidden;
        border: 1px solid var(--gray-200);
    }

    .login-card-body {
        padding: 40px 40px 32px;
    }
}

@media (max-width: 768px) {
    body {
        min-height: 100vh;
        background: linear-gradient(180deg, #10b981 0%, #059669 280px, var(--gray-50) 280px);
        display: flex;
        flex-direction: column;
    }

    .page-wrapper {
        display: flex;
        flex-direction: column;
        flex: 1;
    }

    .brand-panel {
        padding: 40px 24px 32px;
        text-align: center;
        position: relative;
    }

    .brand-pattern {
        position: absolute;
        inset: 0;
        opacity: 0.04;
        background-image: repeating-linear-gradient(45deg, #fff 0px, #fff 1px, transparent 1px, transparent 20px);
        pointer-events: none;
    }

    .brand-ornament {
        display: none;
    }

    .brand-content {
        position: relative;
        z-index: 1;
    }

    .brand-icon {
        width: 48px;
        height: 48px;
        background: rgba(255,255,255,0.15);
        border-radius: var(--radius-md);
        display: flex;
        align-items: center;
        justify-content: center;
        margin: 0 auto 16px;
        border: 1px solid rgba(255,255,255,0.2);
    }

        .brand-icon svg {
            width: 26px;
            height: 26px;
            fill: #fff;
        }

    .brand-content h1 {
        font-size: 26px;
        font-weight: 700;
        color: #fff;
        letter-spacing: 2px;
    }

    .brand-content .brand-subtitle {
        font-size: 13px;
        color: rgba(255,255,255,0.7);
        letter-spacing: 3px;
        margin-top: 4px;
    }

    .brand-desc, .brand-features {
        display: none;
    }

    .login-panel {
        flex: 1;
        padding: 0 16px 24px;
        position: relative;
        z-index: 1;
        margin-top: -20px;
    }

    .login-panel-inner {
        width: 100%;
    }

    .login-header {
        text-align: center;
        margin-bottom: 20px;
    }

        .login-header .welcome {
            font-size: 20px;
            font-weight: 700;
            color: var(--gray-900);
        }

        .login-header .welcome-sub {
            font-size: 13px;
            color: var(--gray-500);
            margin-top: 2px;
        }

    .login-card {
        background: #fff;
        border-radius: var(--radius-lg);
        box-shadow: var(--shadow-lg);
        overflow: hidden;
    }

    .login-card-body {
        padding: 24px 20px 24px;
    }
}

.login-field {
    margin-bottom: 20px;
}

    .login-field .field-label {
        display: flex;
        align-items: center;
        gap: 6px;
        font-size: 13px;
        font-weight: 600;
        color: var(--gray-700);
        margin-bottom: 8px;
        letter-spacing: 0.3px;
    }

.field-label .label-icon {
    width: 16px;
    height: 16px;
    opacity: 0.6;
}

.input-wrapper {
    position: relative;
}

    .input-wrapper .input-icon {
        position: absolute;
        left: 14px;
        top: 50%;
        transform: translateY(-50%);
        width: 18px;
        height: 18px;
        pointer-events: none;
        color: var(--gray-400);
        transition: color var(--transition);
    }

.login-field input[type="text"],
.login-field input[type="password"] {
    width: 100%;
    height: 48px;
    padding: 0 14px 0 42px;
    border: 1.5px solid var(--gray-200);
    border-radius: var(--radius-md);
    font-size: 15px;
    color: var(--gray-800);
    background: var(--gray-50);
    outline: none;
    transition: border-color var(--transition), box-shadow var(--transition), background var(--transition);
    font-family: inherit;
}

    .login-field input[type="text"]:focus,
    .login-field input[type="password"]:focus {
        border-color: var(--green-500);
        box-shadow: 0 0 0 4px rgba(16,185,129,0.1);
        background: #fff;
    }

        .login-field input[type="text"]:focus ~ .input-icon,
        .login-field input[type="password"]:focus ~ .input-icon {
            color: var(--green-500);
        }

.login-field.wrong input[type="text"],
.login-field.wrong input[type="password"] {
    border-color: var(--red-400);
    background: var(--red-50);
}

    .login-field.wrong input[type="text"]:focus,
    .login-field.wrong input[type="password"]:focus {
        box-shadow: 0 0 0 4px rgba(239,68,68,0.1);
    }

.login-field.right input[type="text"],
.login-field.right input[type="password"] {
    border-color: var(--green-400);
}

    .login-field.right input[type="text"]:focus,
    .login-field.right input[type="password"]:focus {
        box-shadow: 0 0 0 4px rgba(16,185,129,0.1);
    }

.field-status {
    position: absolute;
    right: 14px;
    top: 50%;
    transform: translateY(-50%);
    width: 18px;
    height: 18px;
    pointer-events: none;
    opacity: 0;
    transition: opacity var(--transition);
}

.login-field.right .field-status {
    opacity: 1;
}

.captcha-field {
    margin-bottom: 8px;
}

.captcha-row {
    display: flex;
    gap: 10px;
    align-items: center;
}

    .captcha-row .input-wrapper {
        flex: 1;
        min-width: 0;
    }

        .captcha-row .input-wrapper input {
            padding-left: 42px !important;
        }

.captcha-img-wrap {
    flex-shrink: 0;
    position: relative;
    border-radius: var(--radius-md);
    overflow: hidden;
    border: 1px solid var(--gray-200);
    cursor: pointer;
    transition: border-color var(--transition);
}

    .captcha-img-wrap:hover {
        border-color: var(--green-400);
    }

.captcha-row img {
    display: block;
    height: 44px;
    max-width: 110px;
}

.captcha-refresh {
    flex-shrink: 0;
    font-size: 12px;
    color: var(--green-600);
    cursor: pointer;
    text-decoration: none;
    white-space: nowrap;
    font-weight: 500;
    transition: color var(--transition);
    user-select: none;
}

    .captcha-refresh:hover {
        color: var(--green-700);
    }

.captcha-hint {
    display: flex;
    align-items: center;
    gap: 4px;
    font-size: 12px;
    color: var(--gray-400);
    margin-top: 6px;
}

.login-btn {
    width: 100%;
    height: 50px;
    border: none;
    border-radius: var(--radius-md);
    background: linear-gradient(135deg, var(--green-700) 0%, var(--green-600) 40%, var(--green-500) 100%);
    color: #fff;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    letter-spacing: 3px;
    margin-top: 24px;
    transition: all var(--transition);
    position: relative;
    overflow: hidden;
    font-family: inherit;
}

    .login-btn::after {
        content: '';
        position: absolute;
        inset: 0;
        background: linear-gradient(135deg, transparent 0%, rgba(255,255,255,0.1) 50%, transparent 100%);
        opacity: 0;
        transition: opacity var(--transition);
    }

    .login-btn:hover {
        box-shadow: 0 8px 25px rgba(4,120,87,0.35);
        transform: translateY(-1px);
    }

        .login-btn:hover::after {
            opacity: 1;
        }

    .login-btn:active {
        transform: translateY(0) scale(0.985);
    }

.login-error {
    text-align: center;
    font-size: 13px;
    min-height: 22px;
    line-height: 1.5;
    margin-top: 14px;
    color: var(--red-500);
    font-weight: 500;
    padding: 10px 16px;
    background: var(--red-50);
    border-radius: var(--radius-sm);
    display: none;
}

    .login-error:not(:empty) {
        display: block;
    }

.login-footer {
    text-align: center;
    font-size: 12px;
    color: var(--gray-400);
    margin-top: 24px;
}

@media (max-width: 768px) {
    .login-footer {
        margin-top: 16px;
        color: var(--gray-500);
    }
}