/* Layout Styles */

.main-layout {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

.main-header, .main-footer {
    background-color: var(--secondary-bg);
    padding: var(--spacing-unit) 0;
}

.main-header .container,
.main-footer .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: var(--spacing-unit);
    padding-bottom: var(--spacing-unit);
}

.main-content {
    flex: 1;
}

.logo a {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
}

.main-nav ul {
    display: flex;
    gap: calc(var(--spacing-unit) * 2);
}

.main-nav a {
    color: var(--text-primary);
    font-weight: 700;
    padding: 0.5rem;
    border-bottom: 2px solid transparent;
    transition: border-color var(--transition-speed) ease;
}

.main-nav a:hover, .main-nav a.active {
    border-bottom-color: var(--accent-primary);
}

.lang-switch a {
    margin-left: var(--spacing-unit);
    font-weight: bold;
}

.footer-socials a {
    margin: 0 var(--spacing-unit);
    font-size: 1.5rem;
}

/* セクション間の視覚的区切り */
.hero-section {
    background: linear-gradient(135deg, var(--primary-bg) 0%, var(--secondary-bg) 100%);
    padding: calc(var(--spacing-unit) * 6) 0;
    min-height: 80vh;
    display: flex;
    align-items: center;
}

.profile-section {
    background: linear-gradient(
        rgba(26, 26, 26, 0.6), 
        rgba(26, 26, 26, 0.4)
    ), url('../images/sections/profile-bg.jpg');
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    padding: calc(var(--spacing-unit) * 6) 0;
    border-top: 1px solid var(--border-color);
    position: relative;
    overflow: hidden;
    min-height: 100vh;
    z-index: 1;
    background-attachment: scroll;
}

.profile-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(
        135deg,
        rgba(26, 26, 26, 0.6) 0%,
        rgba(26, 26, 26, 0.4) 30%,
        rgba(26, 26, 26, 0.2) 50%,
        rgba(26, 26, 26, 0.4) 70%,
        rgba(26, 26, 26, 0.6) 100%
    );
    pointer-events: none;
    z-index: 1;
}

.profile-section .container {
    position: relative;
    z-index: 2;
}

.projects-section {
    background: linear-gradient(
        rgba(26, 26, 26, 0.7), 
        rgba(26, 26, 26, 0.5)
    ), url('../images/backgrounds/1753107830014.jpg');
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    background-attachment: scroll;
    padding: calc(var(--spacing-unit) * 5) 0;
    border-top: 1px solid var(--border-color);
    position: relative;
    z-index: 1;
}

.contact-section {
    background-color: var(--secondary-bg);
    padding: calc(var(--spacing-unit) * 2) 0;
    border-top: 1px solid var(--border-color);
}

/* About Me タイムライン専用スタイル */
.about-timeline {
    margin: calc(var(--spacing-unit) * 2) 0;
}

.about-item {
    display: grid;
    grid-template-columns: 200px 1fr;
    gap: calc(var(--spacing-unit) * 2);
    margin-bottom: calc(var(--spacing-unit) * 3);
    padding-bottom: calc(var(--spacing-unit) * 2);
    border-bottom: 1px solid var(--border-color);
}

.about-year {
    font-weight: 700;
    color: var(--accent-primary);
    padding: calc(var(--spacing-unit) * 0.5);
    background-color: var(--primary-bg);
    border-radius: 8px;
    text-align: center;
    align-self: start;
}

.about-content h4 {
    color: var(--text-primary);
    margin-bottom: calc(var(--spacing-unit) * 0.5);
    font-size: 1.1rem;
    background-color: rgba(128, 128, 128, 0.3);
    padding: calc(var(--spacing-unit) * 0.5) calc(var(--spacing-unit) * 1);
    border-radius: 6px;
    backdrop-filter: blur(5px);
}

.about-highlight {
    background-color: rgba(128, 128, 128, 0.25);
    padding: calc(var(--spacing-unit) * 1);
    border-radius: 8px;
    margin-top: calc(var(--spacing-unit) * 1);
    border-left: 4px solid var(--accent-primary);
    backdrop-filter: blur(5px);
}

.about-mission {
    background-color: rgba(128, 128, 128, 0.25);
    padding: calc(var(--spacing-unit) * 2);
    border-radius: 12px;
    margin-top: calc(var(--spacing-unit) * 3);
    border: 2px solid var(--accent-primary);
    backdrop-filter: blur(5px);
}