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

:root {
    --clr-bg: #0f1117;
    --clr-card: #1a1d27;
    --clr-border: #2a2d3a;
    --clr-primary: #6366f1;
    --clr-primary-hover: #818cf8;
    --clr-text: #e2e8f0;
    --clr-muted: #94a3b8;
    --clr-error: #f87171;
    --clr-success: #34d399;
    --radius: 12px;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen,
        Ubuntu, Cantarell, sans-serif;
    background: var(--clr-bg);
    color: var(--clr-text);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 1rem;
}

.container {
    width: 100%;
    max-width: 420px;
}

.card {
    background: var(--clr-card);
    border: 1px solid var(--clr-border);
    border-radius: var(--radius);
    padding: 2.5rem 2rem;
    text-align: center;
}

.logo {
    color: var(--clr-primary);
    margin-bottom: 1.25rem;
}

h1 {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
}

.subtitle {
    color: var(--clr-muted);
    font-size: 0.9rem;
    line-height: 1.5;
    margin-bottom: 2rem;
}

.input-group {
    text-align: left;
    margin-bottom: 1.25rem;
}

.input-group label {
    display: block;
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--clr-muted);
    margin-bottom: 0.4rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.input-group input {
    width: 100%;
    padding: 0.75rem 1rem;
    font-size: 0.95rem;
    color: var(--clr-text);
    background: var(--clr-bg);
    border: 1px solid var(--clr-border);
    border-radius: 8px;
    outline: none;
    transition: border-color 0.2s;
}

.input-group input:focus {
    border-color: var(--clr-primary);
}

.input-group input::placeholder {
    color: #4a5568;
}

button[type="submit"] {
    width: 100%;
    padding: 0.75rem;
    font-size: 0.95rem;
    font-weight: 600;
    color: #fff;
    background: var(--clr-primary);
    border: none;
    border-radius: 8px;
    cursor: pointer;
    transition: background 0.2s, opacity 0.2s;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

button[type="submit"]:hover:not(:disabled) {
    background: var(--clr-primary-hover);
}

button[type="submit"]:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

.btn-loader svg {
    animation: spin 1s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

.message {
    margin-top: 1.25rem;
    padding: 0.75rem 1rem;
    border-radius: 8px;
    font-size: 0.85rem;
    line-height: 1.4;
}

.message.error {
    background: rgba(248, 113, 113, 0.1);
    border: 1px solid rgba(248, 113, 113, 0.25);
    color: var(--clr-error);
}

.message.success {
    background: rgba(52, 211, 153, 0.1);
    border: 1px solid rgba(52, 211, 153, 0.25);
    color: var(--clr-success);
}