/* Reset and base styles */
:root {
    --primary-color: #007bff;
    --secondary-color: #6c757d;
    --success-color: #28a745;
    --danger-color: #dc3545;
    --light-color: #f8f9fa;
    --dark-color: #343a40;
}

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

html, body {
    height: 100%;
    width: 100%;
    display: flex;
    justify-content: center;
    align-items: center;
    background: #ffffff;
    font-family: Arial, sans-serif;
}

.wrapper {
    width: 100%;
    max-width: 400px;
    padding: 20px;
    margin: 0 auto;
}

h1 {
    font-size: 32px;
    font-weight: 600;
    color: #000000;
    text-align: center;
    margin-bottom: 30px;
}

.form {
    width: 100%;
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    font-size: 17px;
    font-weight: 700;
    color: #000000;
    margin-bottom: 8px;
}

.form-group input {
    width: 100%;
    height: 46px;
    padding: 0 15px;
    font-size: 16px;
    border: 1px solid #000000;
    border-radius: 3px;
    background: #ffffff;
}

.notice {
    font-size: 14px;
    line-height: 1.5;
    color: #000000;
    margin: 15px 0;
}

.notice a {
    color: #000000;
    text-decoration: underline;
}

.submit-button {
    width: 100%;
    max-width: 350px;
    height: 60px;
    margin: 20px auto;
    display: block;
    background: #ff0000;
    color: #ffffff;
    border: none;
    border-radius: 30px;
    font-size: 20px;
    font-weight: 600;
    cursor: pointer;
}

.login-link {
    text-align: center;
    margin-top: 15px;
}

.login-link a {
    color: #000000;
    font-size: 18px;
    text-decoration: underline;
}

@media (max-width: 479px) {
    .wrapper {
        padding: 15px;
    }

    h1 {
        font-size: 28px;
        margin-bottom: 20px;
    }

    .form-group {
        margin-bottom: 15px;
    }

    .form-group label {
        font-size: 15px;
        margin-bottom: 6px;
    }

    .form-group input {
        height: 42px;
        font-size: 15px;
    }

    .submit-button {
        height: 50px;
        font-size: 18px;
        max-width: 300px;
        margin: 20px auto;
    }

    .notice {
        font-size: 12px;
    }

    .login-link a {
        font-size: 16px;
    }
}

@media (max-width: 359px) {
    .wrapper {
        padding: 10px;
    }

    h1 {
        font-size: 26px;
        margin-bottom: 20px;
    }

    .submit-button {
        height: 46px;
        font-size: 16px;
        max-width: 280px;
    }
}

/* Container */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 15px;
}

/* Grid system */
.row {
    display: flex;
    flex-wrap: wrap;
    margin: -15px;
}

.col {
    flex: 1;
    padding: 15px;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    margin-bottom: 1rem;
    font-weight: 500;
    line-height: 1.2;
}

p {
    margin-bottom: 1rem;
}

/* Forms */
.form-control {
    display: block;
    width: 100%;
    padding: 0.375rem 0.75rem;
    font-size: 1rem;
    line-height: 1.5;
    color: #495057;
    background-color: #fff;
    border: 1px solid #ced4da;
    border-radius: 0.25rem;
    transition: border-color 0.15s ease-in-out, box-shadow 0.15s ease-in-out;
}

.form-control:focus {
    border-color: var(--primary-color);
    outline: 0;
    box-shadow: 0 0 0 0.2rem rgba(0, 123, 255, 0.25);
}

/* Buttons */
.btn {
    display: inline-block;
    font-weight: 400;
    text-align: center;
    vertical-align: middle;
    user-select: none;
    padding: 0.375rem 0.75rem;
    font-size: 1rem;
    line-height: 1.5;
    border-radius: 0.25rem;
    transition: color 0.15s ease-in-out, background-color 0.15s ease-in-out, border-color 0.15s ease-in-out;
    cursor: pointer;
    text-decoration: none;
}

.btn-primary {
    color: #fff;
    background-color: var(--primary-color);
    border: 1px solid var(--primary-color);
}

.btn-primary:hover {
    background-color: #0056b3;
    border-color: #0056b3;
}

/* Navigation */
.nav {
    display: flex;
    flex-wrap: wrap;
    padding-left: 0;
    margin-bottom: 0;
    list-style: none;
}

.nav-link {
    display: block;
    padding: 0.5rem 1rem;
    text-decoration: none;
    color: var(--primary-color);
}

.nav-link:hover {
    color: #0056b3;
}

/* Cards */
.card {
    position: relative;
    display: flex;
    flex-direction: column;
    min-width: 0;
    word-wrap: break-word;
    background-color: #fff;
    background-clip: border-box;
    border: 1px solid rgba(0, 0, 0, 0.125);
    border-radius: 0.25rem;
}

.card-body {
    flex: 1 1 auto;
    padding: 1.25rem;
}

.card-title {
    margin-bottom: 0.75rem;
}

/* Utilities */
.text-center {
    text-align: center;
}

.mt-1 { margin-top: 0.25rem; }
.mt-2 { margin-top: 0.5rem; }
.mt-3 { margin-top: 1rem; }
.mt-4 { margin-top: 1.5rem; }
.mt-5 { margin-top: 3rem; }

.mb-1 { margin-bottom: 0.25rem; }
.mb-2 { margin-bottom: 0.5rem; }
.mb-3 { margin-bottom: 1rem; }
.mb-4 { margin-bottom: 1.5rem; }
.mb-5 { margin-bottom: 3rem; }

.p-1 { padding: 0.25rem; }
.p-2 { padding: 0.5rem; }
.p-3 { padding: 1rem; }
.p-4 { padding: 1.5rem; }
.p-5 { padding: 3rem; }

/* Responsive utilities */
@media (max-width: 768px) {
    .container {
        padding: 0 10px;
    }
    
    .row {
        flex-direction: column;
    }
    
    .col {
        flex: 0 0 100%;
        max-width: 100%;
    }
}

/* Form validation styles */
.form-control.is-invalid {
    border-color: var(--danger-color);
}

.invalid-feedback {
    display: none;
    width: 100%;
    margin-top: 0.25rem;
    font-size: 80%;
    color: var(--danger-color);
}

.was-validated .form-control:invalid ~ .invalid-feedback {
    display: block;
}

/* Alert messages */
.alert {
    position: relative;
    padding: 0.75rem 1.25rem;
    margin-bottom: 1rem;
    border: 1px solid transparent;
    border-radius: 0.25rem;
}

.alert-success {
    color: #155724;
    background-color: #d4edda;
    border-color: #c3e6cb;
}

.alert-danger {
    color: #721c24;
    background-color: #f8d7da;
    border-color: #f5c6cb;
}

/* Custom animations */
@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

.fade-in {
    animation: fadeIn 0.3s ease-in;
}

/* Custom components */
.hero-section {
    padding: 4rem 0;
    background-color: var(--light-color);
    text-align: center;
}

.feature-card {
    text-align: center;
    padding: 2rem;
    margin-bottom: 2rem;
    background-color: #fff;
    border-radius: 0.5rem;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.feature-icon {
    font-size: 2.5rem;
    color: var(--primary-color);
    margin-bottom: 1rem;
}