:root {
    --primary: #4f46e5;
    --primary-hover: #4338ca;
    --dark: #1e293b;
    --gray: #64748b;
    --gray-light: #e2e8f0;
    --light: #f8fafc;
    --white: #ffffff;
    --danger: #ef4444;
    --shadow-lg: 0 18px 40px rgba(15, 23, 42, 0.12);
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
}

body {
    min-height: 100vh;
    color: var(--dark);
    background:
        radial-gradient(circle at top left, rgba(79, 70, 229, 0.16), transparent 34%),
        linear-gradient(135deg, #f8fafc 0%, #eef2ff 52%, #f8fafc 100%);
}

.login-page {
    min-height: 100vh;
    display: grid;
    place-items: center;
    padding: 24px;
}

.login-panel {
    width: min(100%, 430px);
    background: rgba(255, 255, 255, 0.92);
    border: 1px solid rgba(226, 232, 240, 0.9);
    border-radius: 18px;
    box-shadow: var(--shadow-lg);
    padding: 34px;
}

.brand-mark {
    width: 56px;
    height: 56px;
    border-radius: 16px;
    display: grid;
    place-items: center;
    color: var(--white);
    background: var(--primary);
    font-size: 1.45rem;
    margin-bottom: 22px;
}

.eyebrow {
    color: var(--primary);
    font-size: 0.78rem;
    font-weight: 800;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    margin-bottom: 8px;
}

h1 {
    font-size: 1.8rem;
    line-height: 1.2;
    margin-bottom: 10px;
}

.subtitle {
    color: var(--gray);
    line-height: 1.6;
    margin-bottom: 24px;
}

.alert-error {
    display: flex;
    gap: 10px;
    align-items: center;
    color: #991b1b;
    background-color: #fee2e2;
    border: 1px solid #fecaca;
    border-radius: 12px;
    padding: 12px 14px;
    margin-bottom: 18px;
    font-size: 0.9rem;
}

.login-form {
    display: grid;
    gap: 16px;
}

.input-group {
    display: grid;
    gap: 8px;
}

.input-group span {
    color: var(--dark);
    font-size: 0.9rem;
    font-weight: 700;
}

.input-shell {
    height: 48px;
    display: flex;
    align-items: center;
    gap: 12px;
    border: 1px solid var(--gray-light);
    border-radius: 12px;
    background: var(--light);
    padding: 0 14px;
    transition: border-color 0.2s ease, box-shadow 0.2s ease, background-color 0.2s ease;
}

.input-shell:focus-within {
    background: var(--white);
    border-color: rgba(79, 70, 229, 0.45);
    box-shadow: 0 0 0 4px rgba(79, 70, 229, 0.1);
}

.input-shell i {
    color: var(--primary);
}

.input-shell input {
    width: 100%;
    border: 0;
    outline: 0;
    background: transparent;
    color: var(--dark);
    font-size: 0.96rem;
}

.btn-login {
    height: 48px;
    border: 0;
    border-radius: 12px;
    background: var(--primary);
    color: var(--white);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    cursor: pointer;
    font-size: 0.98rem;
    font-weight: 800;
    margin-top: 4px;
    transition: background-color 0.2s ease, transform 0.2s ease;
}

.btn-login:hover {
    background: var(--primary-hover);
    transform: translateY(-1px);
}

.login-hint {
    color: var(--gray);
    font-size: 0.86rem;
    margin-top: 18px;
    text-align: center;
}

@media (max-width: 520px) {
    .login-page {
        padding: 16px;
    }

    .login-panel {
        padding: 26px;
        border-radius: 16px;
    }

    h1 {
        font-size: 1.5rem;
    }
}