:root {
    --login-bg: #eef2f8;
    --panel-bg: rgba(255, 255, 255, 0.9);
    --panel-strong: rgba(255, 255, 255, 0.98);
    --text-primary: #171b24;
    --text-secondary: #5f697b;
    --text-muted: #8a94a6;
    --border-soft: rgba(23, 27, 36, 0.08);
    --shadow-soft: 0 18px 60px rgba(23, 27, 36, 0.08);
    --shadow-panel: 0 24px 80px rgba(23, 27, 36, 0.12);
    --accent: #ff4d6d;
    --accent-strong: #ff2f56;
    --accent-blue: #4f7cff;
    --accent-gradient: linear-gradient(135deg, #ff4d6d 0%, #ff7b54 55%, #4f7cff 100%);
    --radius-xl: 28px;
    --radius-lg: 20px;
    --radius-md: 14px;
    --transition: 0.22s ease;
}

*,
*::before,
*::after {
    box-sizing: border-box;
}

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

body {
    font-family: 'Inter', 'Noto Sans SC', -apple-system, BlinkMacSystemFont, sans-serif;
    color: var(--text-primary);
    background:
        radial-gradient(circle at 14% 18%, rgba(255, 77, 109, 0.18), transparent 26%),
        radial-gradient(circle at 86% 12%, rgba(79, 124, 255, 0.18), transparent 24%),
        radial-gradient(circle at 82% 82%, rgba(255, 123, 84, 0.12), transparent 22%),
        linear-gradient(180deg, #f9fafc 0%, var(--login-bg) 100%);
    position: relative;
    overflow-x: hidden;
}

body::before {
    content: '';
    position: fixed;
    inset: 0;
    background-image:
        linear-gradient(rgba(23, 27, 36, 0.035) 1px, transparent 1px),
        linear-gradient(90deg, rgba(23, 27, 36, 0.035) 1px, transparent 1px);
    background-size: 38px 38px;
    mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.75), transparent 92%);
    pointer-events: none;
}

.login-shell {
    width: min(460px, calc(100% - 32px));
    min-height: 100vh;
    margin: 0 auto;
    padding: 32px 0;
    display: flex;
    align-items: center;
    justify-content: center;
}

.auth-card {
    position: relative;
    width: 100%;
    border-radius: var(--radius-xl);
    border: 1px solid var(--border-soft);
    overflow: hidden;
}

.auth-card {
    padding: 36px 30px;
    background: var(--panel-strong);
    box-shadow: var(--shadow-panel);
    backdrop-filter: blur(18px);
}

.auth-head {
    margin-bottom: 26px;
}

.auth-kicker {
    margin-bottom: 14px;
    font-size: 0.76rem;
    font-weight: 800;
    letter-spacing: 0.16em;
    color: var(--accent);
    text-transform: uppercase;
}

.auth-head h2 {
    margin: 0;
    font-family: 'Noto Sans SC', sans-serif;
    font-size: 2rem;
    line-height: 1.15;
    letter-spacing: -0.04em;
}

.login-form {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.field-label {
    font-size: 0.84rem;
    font-weight: 700;
    color: var(--text-secondary);
    letter-spacing: 0.03em;
}

.field-shell {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 12px;
    border-radius: var(--radius-md);
    border: 1px solid rgba(23, 27, 36, 0.12);
    background: rgba(248, 250, 252, 0.86);
    transition: border-color var(--transition), box-shadow var(--transition), transform var(--transition);
}

.field-shell:focus-within {
    border-color: rgba(255, 77, 109, 0.45);
    box-shadow: 0 0 0 4px rgba(255, 77, 109, 0.1);
    transform: translateY(-1px);
}

.field-shell input {
    flex: 1;
    border: 0;
    background: transparent;
    color: var(--text-primary);
    font-size: 0.96rem;
    font-weight: 600;
    outline: none;
    min-width: 0;
}

.field-shell input::placeholder {
    color: #9aa3b4;
    font-weight: 500;
}

.ghost-btn {
    border: 0;
    background: rgba(23, 27, 36, 0.05);
    color: var(--text-secondary);
    border-radius: 10px;
    padding: 9px 12px;
    cursor: pointer;
    font-size: 0.78rem;
    font-weight: 700;
    transition: background var(--transition), color var(--transition);
}

.ghost-btn:hover {
    background: rgba(23, 27, 36, 0.08);
    color: var(--text-primary);
}

.submit-btn {
    margin-top: 4px;
    border: 0;
    border-radius: 14px;
    padding: 15px 18px;
    background: var(--accent-gradient);
    color: #fff;
    cursor: pointer;
    font-size: 0.96rem;
    font-weight: 800;
    letter-spacing: 0.05em;
    box-shadow: 0 18px 36px rgba(255, 77, 109, 0.22);
    transition: transform var(--transition), box-shadow var(--transition), opacity var(--transition);
}

.submit-btn:hover {
    transform: translateY(-1px);
    box-shadow: 0 20px 40px rgba(255, 77, 109, 0.28);
}

.submit-btn:disabled,
.ghost-btn:disabled {
    opacity: 0.6;
    cursor: wait;
    transform: none;
}

.login-error {
    margin: 2px 0 0;
    padding: 12px 14px;
    border-radius: 12px;
    background: rgba(255, 77, 109, 0.08);
    color: #c81e45;
    font-size: 0.85rem;
    font-weight: 600;
}

@media (max-width: 980px) {
    .login-shell {
        width: min(460px, calc(100% - 28px));
        padding: 22px 0 30px;
    }

    .auth-card {
        padding: 28px 22px;
    }
}

@media (max-width: 640px) {
    .auth-head h2 {
        font-size: 1.7rem;
    }

    .field-shell {
        flex-direction: column;
        align-items: stretch;
    }

    .ghost-btn {
        width: 100%;
    }
}