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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Noto Sans JP', sans-serif;
    background: #0a0a0f;
    color: #e2e8f0;
    min-height: 100vh;
}

/* Header - Apps/Reportと統一 */
header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 40px;
    border-bottom: 1px solid rgba(255,255,255,0.1);
    background: rgba(10, 10, 15, 0.95);
    position: sticky;
    top: 0;
    z-index: 100;
    backdrop-filter: blur(10px);
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 1.3rem;
    font-weight: 700;
    color: #a78bfa;
    text-decoration: none;
}

nav {
    display: flex;
    gap: 8px;
}

nav a {
    color: rgba(255,255,255,0.7);
    text-decoration: none;
    padding: 8px 16px;
    border-radius: 6px;
    transition: all 0.3s;
}

nav a:hover, nav a.active {
    background: rgba(167, 139, 250, 0.2);
    color: #fff;
}

/* Page Header */
.page-header {
    text-align: center;
    max-width: 1100px;
    margin: 60px auto 40px;
    padding: 0 20px;
}

.page-header h1 {
    font-size: 3rem;
    margin-bottom: 16px;
    background: linear-gradient(135deg, #fbbf24, #22d3ee);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.page-header p {
    color: rgba(255,255,255,0.5);
    font-size: 1.1rem;
}

/* Date Navigation */
.date-nav {
    display: flex;
    gap: 12px;
    justify-content: center;
    margin: 20px auto 40px;
    max-width: 1100px;
    padding: 0 20px;
}

.nav-btn {
    padding: 10px 20px;
    background: rgba(255,255,255,0.05);
    border: 1px solid rgba(255,255,255,0.1);
    border-radius: 10px;
    color: rgba(255,255,255,0.7);
    text-decoration: none;
    transition: all 0.3s;
    font-size: 0.9rem;
}

.nav-btn:hover {
    background: rgba(255,255,255,0.1);
    border-color: rgba(34, 211, 238, 0.4);
    color: #fff;
}

.nav-btn.current {
    background: rgba(167, 139, 250, 0.2);
    border-color: rgba(167, 139, 250, 0.5);
    color: #a78bfa;
    cursor: default;
}

/* Main Content */
main {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 20px 60px;
}

.section {
    background: rgba(255,255,255,0.03);
    border: 1px solid rgba(255,255,255,0.08);
    border-radius: 20px;
    padding: 40px;
    margin-bottom: 32px;
    transition: all 0.3s;
}

.section:hover {
    border-color: rgba(255,255,255,0.15);
}

.section-title {
    font-size: 1.8rem;
    margin-bottom: 30px;
    color: #fff;
    display: flex;
    align-items: center;
    gap: 12px;
    padding-bottom: 16px;
    border-bottom: 2px solid rgba(167, 139, 250, 0.3);
}

/* News Items */
.news-item {
    margin-bottom: 28px;
    padding-bottom: 28px;
    border-bottom: 1px solid rgba(255,255,255,0.05);
}

.news-item:last-child {
    border-bottom: none;
    margin-bottom: 0;
    padding-bottom: 0;
}

.news-title {
    font-size: 1.2rem;
    font-weight: 600;
    margin-bottom: 10px;
    line-height: 1.4;
}

.news-title a {
    color: #fff;
    text-decoration: none;
    transition: color 0.3s;
}

.news-title a:hover {
    color: #22d3ee;
}

.news-meta {
    font-size: 0.85rem;
    color: rgba(255,255,255,0.4);
    margin-bottom: 12px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.news-summary {
    font-size: 0.95rem;
    line-height: 1.7;
    color: rgba(255,255,255,0.7);
}

/* History Items */
.history-item {
    margin-bottom: 24px;
    padding-left: 24px;
    border-left: 3px solid #a78bfa;
    position: relative;
}

.history-item::before {
    content: '';
    position: absolute;
    left: -6px;
    top: 6px;
    width: 9px;
    height: 9px;
    background: #a78bfa;
    border-radius: 50%;
}

.history-year {
    font-weight: 700;
    color: #a78bfa;
    font-size: 1.2rem;
    margin-bottom: 6px;
}

.history-event {
    color: rgba(255,255,255,0.85);
    line-height: 1.7;
}

/* Learning Cards */
.learning-card {
    background: rgba(255,255,255,0.05);
    border: 1px solid rgba(255,255,255,0.08);
    border-radius: 16px;
    padding: 28px;
    margin-bottom: 20px;
    transition: all 0.3s;
}

.learning-card:hover {
    background: rgba(255,255,255,0.08);
    border-color: rgba(34, 211, 238, 0.3);
}

.learning-card:last-child {
    margin-bottom: 0;
}

.word-title {
    font-size: 1.4rem;
    font-weight: 700;
    color: #fff;
    margin-bottom: 10px;
}

.word-pronunciation {
    font-size: 0.95rem;
    color: rgba(255,255,255,0.5);
    font-style: italic;
    margin-bottom: 16px;
}

.word-definition {
    font-size: 0.95rem;
    line-height: 1.8;
    color: rgba(255,255,255,0.85);
    margin-bottom: 16px;
}

.word-definition strong {
    color: #22d3ee;
}

.word-example {
    font-size: 0.9rem;
    line-height: 1.7;
    color: rgba(255,255,255,0.65);
    font-style: italic;
    padding-left: 20px;
    border-left: 3px solid rgba(34, 211, 238, 0.4);
}

/* Tech Items */
.tech-item {
    display: flex;
    gap: 20px;
    margin-bottom: 24px;
    padding-bottom: 24px;
    border-bottom: 1px solid rgba(255,255,255,0.05);
}

.tech-item:last-child {
    border-bottom: none;
    margin-bottom: 0;
    padding-bottom: 0;
}

.tech-rank {
    font-size: 2rem;
    font-weight: 700;
    background: linear-gradient(135deg, #fbbf24, #22d3ee);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    min-width: 50px;
    text-align: center;
}

.tech-content {
    flex: 1;
}

.tech-name {
    font-size: 1.15rem;
    font-weight: 600;
    margin-bottom: 8px;
}

.tech-name a {
    color: #fff;
    text-decoration: none;
    transition: color 0.3s;
}

.tech-name a:hover {
    color: #22d3ee;
}

.tech-desc {
    font-size: 0.9rem;
    color: rgba(255,255,255,0.7);
    line-height: 1.6;
    margin-bottom: 8px;
}

.tech-stats {
    font-size: 0.85rem;
    color: rgba(255,255,255,0.4);
}

/* Archive Grid */
.archive-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: 20px;
    margin-top: 40px;
}

.archive-card {
    background: rgba(255,255,255,0.03);
    border: 1px solid rgba(255,255,255,0.08);
    border-radius: 16px;
    padding: 24px;
    text-decoration: none;
    color: inherit;
    transition: all 0.3s;
}

.archive-card:hover {
    background: rgba(255,255,255,0.08);
    border-color: rgba(34, 211, 238, 0.4);
    transform: translateY(-4px);
}

.archive-date {
    font-size: 1.3rem;
    font-weight: 700;
    color: #fff;
    margin-bottom: 8px;
}

.archive-meta {
    font-size: 0.85rem;
    color: rgba(255,255,255,0.5);
}

/* Footer */
footer {
    text-align: center;
    padding: 40px 20px;
    color: rgba(255,255,255,0.3);
    font-size: 0.9rem;
}

footer a {
    color: #a78bfa;
    text-decoration: none;
    transition: color 0.3s;
}

footer a:hover {
    color: #22d3ee;
}

/* Responsive */
@media (max-width: 768px) {
    body { padding: 0; }
    header { 
        flex-direction: column; 
        gap: 16px;
        padding: 16px 20px;
    }
    .page-header h1 { font-size: 2rem; }
    .section { padding: 24px; }
    .date-nav { flex-wrap: wrap; }
    .tech-item { flex-direction: column; gap: 12px; }
    .tech-rank { font-size: 1.5rem; }
    .archive-grid { grid-template-columns: 1fr; }
}