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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: #333;
    background: linear-gradient(-45deg, #667eea, #764ba2, #f093fb, #4facfe);
    background-size: 400% 400%;
    animation: gradientShift 15s ease infinite;
    min-height: 100vh;
}

@keyframes gradientShift {
    0% {
        background-position: 0% 50%;
    }
    50% {
        background-position: 100% 50%;
    }
    100% {
        background-position: 0% 50%;
    }
}

/* Authentication Container */
.auth-container {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
}

.auth-box {
    background: white;
    padding: 40px;
    border-radius: 10px;
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.2);
    text-align: center;
    width: 100%;
    max-width: 400px;
}

.auth-box h1 {
    margin-bottom: 10px;
    color: #667eea;
    font-size: 2.5em;
}

.auth-box p {
    margin-bottom: 20px;
    color: #666;
    font-size: 0.95em;
}

.auth-box input {
    width: 100%;
    padding: 12px;
    margin-bottom: 15px;
    border: 2px solid #ddd;
    border-radius: 5px;
    font-size: 1em;
    transition: border-color 0.3s;
}

.auth-box input:focus {
    outline: none;
    border-color: #667eea;
}

.auth-box button {
    width: 100%;
    padding: 12px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border: none;
    border-radius: 5px;
    font-size: 1em;
    font-weight: bold;
    cursor: pointer;
    transition: transform 0.2s;
}

.auth-box button:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(102, 126, 234, 0.4);
}

/* ローディングスピナー */
.loading-spinner {
    display: flex;
    justify-content: center;
    margin-top: 15px;
}

.spinner {
    width: 30px;
    height: 30px;
    border: 3px solid #f3f3f3;
    border-top: 3px solid #667eea;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.error-msg {
    color: #e74c3c;
    font-size: 0.9em;
    margin-top: 10px;
    display: none;
}

.error-msg.show {
    display: block;
}

/* Main Content */
.main-content {
    background: white;
    min-height: 100vh;
}

.container {
    max-width: 1000px;
    margin: 0 auto;
    padding: 20px;
}

/* Navbar */
.navbar {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 15px 0;
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.8em;
    font-weight: bold;
}

.nav-menu {
    list-style: none;
    display: flex;
    gap: 25px;
}

.nav-menu a {
    color: white;
    text-decoration: none;
    transition: opacity 0.3s;
}

.nav-menu a:hover {
    opacity: 0.8;
}

/* Sections */
.section {
    margin-bottom: 50px;
    padding-bottom: 30px;
    border-bottom: 1px solid #eee;
}

.section h2 {
    font-size: 2em;
    color: #667eea;
    margin-bottom: 25px;
    padding-bottom: 10px;
    border-bottom: 3px solid #667eea;
}

/* Profile */
.profile-content {
    background: #f8f9fa;
    padding: 25px;
    border-radius: 8px;
    border-left: 4px solid #667eea;
}

.profile-text p {
    margin-bottom: 15px;
    font-size: 1.05em;
    line-height: 1.8;
}

.profile-text strong {
    color: #667eea;
}

.profile-text hr {
    margin: 20px 0;
    border: none;
    border-top: 1px solid #ddd;
}

/* Skills */
.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
}

.skill-card {
    background: #f8f9fa;
    padding: 25px;
    border-radius: 8px;
    border-top: 4px solid #667eea;
    transition: transform 0.3s;
}

.skill-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 5px 15px rgba(102, 126, 234, 0.1);
}

.skill-card h3 {
    color: #667eea;
    margin-bottom: 15px;
    font-size: 1.2em;
}

.skill-card ul {
    list-style-position: inside;
}

.skill-card li {
    padding: 8px 0;
    color: #555;
}

/* Works */
.works-container {
    display: grid;
    gap: 25px;
}

.work-card {
    background: #f8f9fa;
    padding: 25px;
    border-radius: 8px;
    border-left: 4px solid #764ba2;
    transition: box-shadow 0.3s;
}

.work-card:hover {
    box-shadow: 0 5px 15px rgba(118, 75, 162, 0.1);
}

.work-card h3 {
    color: #667eea;
    margin-bottom: 15px;
    font-size: 1.3em;
}

.work-content h4 {
    color: #555;
    margin-top: 15px;
    margin-bottom: 10px;
    font-size: 1.05em;
}

.work-content p {
    color: #666;
    margin-bottom: 10px;
}

.work-content ul {
    list-style-position: inside;
    margin-bottom: 10px;
}

.work-content li {
    color: #666;
    margin-bottom: 5px;
}

.highlight {
    background: white;
    padding: 12px;
    border-left: 3px solid #667eea;
    margin: 10px 0;
    border-radius: 4px;
    color: #555;
}

/* Qualifications */
.qualifications-list {
    display: grid;
    gap: 15px;
}

.qualification-item {
    display: flex;
    align-items: center;
    padding: 15px;
    background: #f8f9fa;
    border-radius: 8px;
    border-left: 4px solid #667eea;
}

.qualification-badge {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 35px;
    height: 35px;
    background: #667eea;
    color: white;
    border-radius: 50%;
    font-weight: bold;
    margin-right: 15px;
    flex-shrink: 0;
}

.qualification-item p {
    margin: 0;
    color: #555;
    font-size: 1.05em;
}

/* Footer */
footer {
    background: #f8f9fa;
    text-align: center;
    padding: 20px;
    color: #999;
    border-top: 1px solid #eee;
    margin-top: 50px;
}

/* Responsive Design */
@media (max-width: 768px) {
    .navbar .container {
        flex-direction: column;
        gap: 15px;
    }

    .nav-menu {
        flex-wrap: wrap;
        justify-content: center;
        gap: 15px;
    }

    .container {
        padding: 15px;
    }

    .section h2 {
        font-size: 1.5em;
    }

    .skills-grid {
        grid-template-columns: 1fr;
    }

    .auth-box {
        margin: 20px;
    }
}