:root {
    --bg-0: #0b0d12;
    --bg-1: #141822;
    --bg-2: #1b2030;
    --border: #2a3142;
    --fg-0: #e8ecf4;
    --fg-1: #a5adc0;
    --fg-2: #6f788f;
    --accent: #5b8cff;
    --accent-hover: #7aa0ff;
    --danger: #ff5c6c;
    --danger-bg: rgba(255, 92, 108, 0.12);
    --radius: 12px;
    --shadow: 0 20px 60px rgba(0, 0, 0, 0.55);
}

* {
    box-sizing: border-box;
}

html,
body {
    margin: 0;
    padding: 0;
    min-height: 100vh;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    background: radial-gradient(ellipse at top, #1a2138 0%, var(--bg-0) 60%);
    color: var(--fg-0);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

.login-shell {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 24px;
}

.login-card {
    width: 100%;
    max-width: 420px;
    background: var(--bg-1);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 36px 32px 28px;
    box-shadow: var(--shadow);
}

.login-head {
    text-align: center;
    margin-bottom: 28px;
}

.brand-mark {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 56px;
    height: 56px;
    border-radius: 14px;
    background: linear-gradient(135deg, var(--accent), #7a6bff);
    color: #fff;
    font-weight: 700;
    font-size: 20px;
    letter-spacing: 0.5px;
    margin-bottom: 14px;
    box-shadow: 0 8px 24px rgba(91, 140, 255, 0.35);
}

.login-head h1 {
    margin: 0 0 6px;
    font-size: 22px;
    font-weight: 600;
    letter-spacing: -0.01em;
}

.login-head .sub {
    margin: 0;
    color: var(--fg-1);
    font-size: 13px;
}

.alert {
    background: var(--danger-bg);
    color: var(--danger);
    border: 1px solid rgba(255, 92, 108, 0.3);
    border-radius: 8px;
    padding: 10px 14px;
    font-size: 13px;
    margin-bottom: 16px;
}

form {
    display: flex;
    flex-direction: column;
    gap: 14px;
}

.field {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.field > span {
    font-size: 12px;
    color: var(--fg-1);
    font-weight: 500;
    letter-spacing: 0.02em;
}

.field input {
    background: var(--bg-2);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 11px 14px;
    color: var(--fg-0);
    font-size: 14px;
    transition: border-color 0.15s, box-shadow 0.15s;
    font-family: inherit;
}

.field input:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(91, 140, 255, 0.18);
}

.field input::placeholder {
    color: var(--fg-2);
}

.password-wrap {
    position: relative;
}

.password-wrap input {
    width: 100%;
    padding-right: 68px;
}

.toggle-pw {
    position: absolute;
    top: 50%;
    right: 6px;
    transform: translateY(-50%);
    background: transparent;
    border: none;
    color: var(--fg-1);
    font-size: 12px;
    padding: 6px 10px;
    cursor: pointer;
    border-radius: 6px;
}

.toggle-pw:hover {
    color: var(--fg-0);
    background: var(--bg-2);
}

.btn-primary {
    margin-top: 6px;
    background: var(--accent);
    color: #fff;
    border: none;
    border-radius: 8px;
    padding: 12px 16px;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: background 0.15s, transform 0.05s;
    font-family: inherit;
}

.btn-primary:hover:not(:disabled) {
    background: var(--accent-hover);
}

.btn-primary:active:not(:disabled) {
    transform: translateY(1px);
}

.btn-primary:disabled {
    opacity: 0.55;
    cursor: not-allowed;
}

.login-foot {
    margin-top: 22px;
    text-align: center;
    color: var(--fg-2);
    font-size: 11px;
}