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

body {
    font-family: "Inter", -apple-system, BlinkMacSystemFont, sans-serif;
    background-color: #f5f7fa;
    color: #333;
    min-height: 100vh;
    line-height: 1.5;
}

/* Layout */
.container {
    max-width: 640px;
    margin: 0 auto;
    padding: 0 20px;
}

.hidden {
    display: none;
}

/* Header */
.header {
    background-color: #1a1a2e;
    padding: 16px 0;
    margin-bottom: 40px;
}

.header .container {
    display: flex;
    align-items: center;
    gap: 12px;
}

.header .logo {
    width: 32px;
    height: 32px;
}

.header .brand {
    color: #fff;
    font-size: 18px;
    font-weight: 500;
    letter-spacing: 0.3px;
}

/* Card */
.card {
    background: #fff;
    border-radius: 8px;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.08), 0 1px 2px rgba(0, 0, 0, 0.06);
    padding: 32px;
    margin-bottom: 24px;
}

.card h1 {
    font-size: 22px;
    font-weight: 600;
    color: #1a1a2e;
    margin-bottom: 24px;
    padding-bottom: 16px;
    border-bottom: 1px solid #eee;
}

/* Form */
.form-row {
    display: flex;
    gap: 16px;
    margin-bottom: 16px;
}

.form-control {
    flex: 1;
    width: 100%;
    border: 1px solid #ddd;
    border-radius: 6px;
    padding: 12px 14px;
    font-size: 14px;
    font-family: inherit;
    color: #333;
    background: #fff;
    transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

.form-control:focus {
    outline: none;
    border-color: #1a1a2e;
    box-shadow: 0 0 0 3px rgba(26, 26, 46, 0.1);
}

.form-control::placeholder {
    color: #999;
}

textarea.form-control {
    resize: vertical;
    font-family: "SF Mono", Monaco, "Cascadia Code", Consolas, monospace;
    font-size: 13px;
    line-height: 1.5;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border: 1px solid #ddd;
    border-radius: 6px;
    padding: 10px 20px;
    font-size: 14px;
    font-weight: 500;
    font-family: inherit;
    background: #fff;
    color: #333;
    cursor: pointer;
    transition: all 0.15s ease;
}

.btn:hover {
    background: #f8f9fa;
    border-color: #ccc;
}

.btn:focus {
    outline: none;
    box-shadow: 0 0 0 3px rgba(26, 26, 46, 0.1);
}

.btn-primary {
    background: #1a1a2e;
    border-color: #1a1a2e;
    color: #fff;
}

.btn-primary:hover {
    background: #2d2d4a;
    border-color: #2d2d4a;
}

.button-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: 24px;
    padding-top: 20px;
    border-top: 1px solid #eee;
}

.button-group {
    display: flex;
    gap: 10px;
}

/* Alert */
.alert {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    padding: 16px;
    border-radius: 6px;
    font-size: 14px;
}

.alert-icon {
    width: 20px;
    height: 20px;
    flex-shrink: 0;
    margin-top: 1px;
}

.alert-danger {
    background: #fef2f2;
    border: 1px solid #fecaca;
    color: #991b1b;
}

/* Responsive */
@media (max-width: 600px) {
    .header {
        margin-bottom: 24px;
    }

    .card {
        padding: 20px;
    }

    .form-row {
        flex-direction: column;
        gap: 12px;
    }

    .button-row {
        flex-direction: column;
        gap: 12px;
    }

    .button-group {
        width: 100%;
        flex-direction: column;
    }

    .btn {
        width: 100%;
    }
}