:root {
    --primary-blue: #1a365d;
    --secondary-blue: #2d5b8a;
    --accent-blue: #3b82f6;
    --light-bg: #f7fafc;
    --medium-bg: #edf2f7;
    --white: #ffffff;
    --text-dark: #2d3748;
    --text-light: #718096;
    --border-color: #cbd5e0;
    --success: #38a169;
    --warning: #dd6b20;
    --caution: #d69e2e;
    --error: #e53e3e;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

body {
    background: linear-gradient(135deg, var(--light-bg), var(--medium-bg));
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 20px;
    color: var(--text-dark);
}

.container {
    width: 100%;
    max-width: 500px;
    background-color: var(--white);
    border-radius: 12px;
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.1);
    overflow: hidden;
}

.header {
    background: linear-gradient(to right, var(--primary-blue), var(--secondary-blue));
    color: var(--white);
    padding: 28px 20px;
    text-align: center;
    position: relative;
}

    .header::after {
        content: '';
        position: absolute;
        bottom: 0;
        left: 0;
        width: 100%;
        height: 4px;
        background: linear-gradient(to right, var(--accent-blue), #63b3ed);
    }

.logo {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    margin-bottom: 12px;
}

    .logo svg {
        width: 36px;
        height: 36px;
        fill: var(--white);
    }

.header h1 {
    font-size: 24px;
    margin-bottom: 8px;
    font-weight: 600;
    letter-spacing: 0.5px;
}

.header h2 {
    font-size: 16px;
    font-weight: 400;
    opacity: 0.9;
}

.content {
    padding: 32px;
}

.input-group {
    margin-bottom: 28px;
}

    .input-group label {
        display: block;
        margin-bottom: 10px;
        color: var(--text-dark);
        font-weight: 600;
        font-size: 15px;
    }

.input-container {
    position: relative;
    display: flex;
    align-items: center;
}

    .input-container svg {
        position: absolute;
        left: 15px;
        width: 20px;
        height: 20px;
        fill: var(--text-light);
    }

.input-group input {
    width: 100%;
    padding: 15px 15px 15px 48px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    font-size: 16px;
    transition: all 0.3s ease;
    background-color: var(--white);
    color: var(--text-dark);
}

    .input-group input:focus {
        outline: none;
        border-color: var(--accent-blue);
        box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.15);
    }

    .input-group input::placeholder {
        color: var(--text-light);
        opacity: 0.7;
    }

.btn {
    background: linear-gradient(to right, var(--accent-blue), var(--secondary-blue));
    color: var(--white);
    border: none;
    padding: 15px 20px;
    border-radius: 8px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    width: 100%;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    letter-spacing: 0.5px;
}

    .btn:hover {
        background: linear-gradient(to right, var(--secondary-blue), var(--primary-blue));
        transform: translateY(-2px);
        box-shadow: 0 6px 15px rgba(0, 0, 0, 0.1);
    }

    .btn:active {
        transform: translateY(0);
    }

    .btn svg {
        width: 18px;
        height: 18px;
        fill: var(--white);
    }

.info {
    margin-top: 28px;
    padding: 20px;
    background-color: var(--light-bg);
    border-radius: 8px;
    border-left: 4px solid var(--accent-blue);
    font-size: 14px;
    color: var(--text-dark);
}

.info-header {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 12px;
    font-weight: 600;
}

    .info-header svg {
        width: 18px;
        height: 18px;
        fill: var(--accent-blue);
    }

.info p {
    margin-bottom: 10px;
    line-height: 1.5;
}

.info ul {
    padding-left: 20px;
    margin-top: 10px;
}

.info li {
    margin-bottom: 6px;
    position: relative;
}

    .info li::before {
        content: '•';
        color: var(--accent-blue);
        font-weight: bold;
        position: absolute;
        left: -12px;
    }

.caution {
    margin-top: 24px;
    padding: 18px;
    background-color: rgba(214, 158, 46, 0.1);
    border-radius: 8px;
    border-left: 4px solid var(--caution);
    font-size: 14px;
    color: var(--text-dark);
    display: flex;
    gap: 14px;
}

    .caution svg {
        width: 22px;
        height: 22px;
        fill: var(--caution);
        flex-shrink: 0;
        margin-top: 2px;
    }

.caution-content p {
    margin-bottom: 6px;
    line-height: 1.5;
}

.footer {
    text-align: center;
    padding: 20px;
    color: var(--text-light);
    font-size: 13px;
    border-top: 1px solid var(--border-color);
    background-color: var(--light-bg);
}

.example-slips {
    display: flex;
    gap: 10px;
    margin-top: 12px;
    flex-wrap: wrap;
}

.example-slip {
    padding: 7px 14px;
    background-color: var(--medium-bg);
    border-radius: 6px;
    font-size: 13px;
    cursor: pointer;
    transition: all 0.2s ease;
    border: 1px solid var(--border-color);
}

    .example-slip:hover {
        background-color: var(--accent-blue);
        color: white;
        border-color: var(--accent-blue);
    }

/* Spinner Animation */
.spinner {
    animation: spin 1s linear infinite;
}

@keyframes spin {
    from {
        transform: rotate(0deg);
    }

    to {
        transform: rotate(360deg);
    }
}

@media (max-width: 576px) {
    .container {
        max-width: 100%;
    }

    .header h1 {
        font-size: 22px;
    }

    .header h2 {
        font-size: 15px;
    }

    .content {
        padding: 25px 20px;
    }

    .example-slips {
        justify-content: center;
    }
}