/* Base styles - very typical, clean corporate/portfolio standard */
:root {
    --text-main: #333333;
    --text-light: #666666;
    --bg-main: #ffffff;
    --bg-alt: #f5f5f5;
    --border-color: #e0e0e0;
    --primary-color: #0056b3;
}

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

body {
    font-family: "Helvetica Neue", Arial, "Hiragino Kaku Gothic ProN", "Hiragino Sans", Meiryo, sans-serif;
    color: var(--text-main);
    background-color: var(--bg-main);
    line-height: 1.6;
}

a {
    text-decoration: none;
    color: var(--primary-color);
}

a:hover {
    text-decoration: underline;
}

.container {
    max-width: 1080px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Header */
.header {
    border-bottom: 1px solid var(--border-color);
    background-color: #fff;
    padding: 20px 0;
}

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

.logo {
    font-size: 24px;
    font-weight: bold;
    color: var(--text-main);
}

.nav a {
    margin-left: 30px;
    color: var(--text-main);
    font-weight: bold;
}

/* Hero */
.hero {
    padding: 80px 0;
    background-color: var(--bg-alt);
    text-align: center;
}

.hero-title {
    font-size: 32px;
    margin-bottom: 20px;
}

.hero-desc {
    font-size: 16px;
    color: var(--text-light);
    max-width: 800px;
    margin: 0 auto;
}

/* Sections */
.section-title {
    font-size: 28px;
    margin-bottom: 40px;
    text-align: center;
    border-bottom: 2px solid var(--primary-color);
    display: inline-block;
    padding-bottom: 10px;
}

.projects-section {
    padding: 80px 0;
}

/* Project Row Split Layout */
.project-row {
    display: flex;
    align-items: flex-start;
    margin-bottom: 80px;
    gap: 40px;
}

.project-row.reverse {
    flex-direction: row-reverse;
}

.project-media {
    flex: 1;
    min-width: 300px;
}

.media-placeholder {
    width: 100%;
    aspect-ratio: 16 / 9;
    background-color: #e9ecef;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #999;
    font-size: 14px;
    border: 1px solid var(--border-color);
}

.project-content {
    flex: 1;
}

.project-name {
    font-size: 24px;
    margin-bottom: 10px;
}

.project-summary {
    font-weight: bold;
    margin-bottom: 20px;
    color: var(--text-main);
}

.project-description {
    color: var(--text-light);
    margin-bottom: 20px;
}

.tech-stack {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-bottom: 20px;
}

.tech-tag {
    background-color: var(--bg-alt);
    border: 1px solid var(--border-color);
    padding: 4px 12px;
    font-size: 12px;
    border-radius: 4px;
    color: var(--text-main);
}

/* Auth Box */
.auth-box {
    background-color: #f8f9fa;
    border: 1px solid var(--border-color);
    border-left: 4px solid var(--primary-color);
    padding: 15px;
    margin-bottom: 20px;
}

.auth-title {
    font-weight: bold;
    font-size: 14px;
    margin-bottom: 5px;
}

.auth-link {
    display: block;
    margin-bottom: 5px;
    word-break: break-all;
}

.auth-credentials {
    font-family: monospace;
    font-size: 14px;
    color: #555;
}

/* Skills */
.skills-section {
    background-color: var(--bg-alt);
    padding: 80px 0;
}

.skills-grid {
    display: flex;
    justify-content: space-between;
    gap: 20px;
}

.skill-card {
    background-color: #fff;
    padding: 30px;
    flex: 1;
    border: 1px solid var(--border-color);
}

.skill-card h4 {
    margin-bottom: 15px;
    color: var(--primary-color);
}

/* Footer */
.footer {
    text-align: center;
    padding: 30px 0;
    border-top: 1px solid var(--border-color);
    background-color: #fff;
}

/* Responsive */
@media (max-width: 768px) {
    .project-row, .project-row.reverse {
        flex-direction: column;
    }
    .skills-grid {
        flex-direction: column;
    }
    .header-container {
        flex-direction: column;
        gap: 15px;
    }
}