:root {
    --primary-color: #d4af37;
    /* Gold */
    --secondary-color: #0a192f;
    /* Deep Navy */
    --text-color: #e6f1ff;
    /* Off-white */
    --text-muted: #8892b0;
    --bg-gradient: linear-gradient(135deg, #020c1b 0%, #0a192f 100%);
    --glass-bg: rgba(255, 255, 255, 0.05);
    --glass-border: rgba(255, 255, 255, 0.1);
    --glass-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.37);
    --font-main: 'Noto Sans JP', sans-serif;
    --font-serif: 'Noto Serif JP', serif;
}

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

body {
    font-family: var(--font-main);
    background: var(--bg-gradient);
    color: var(--text-color);
    line-height: 1.6;
    min-height: 100vh;
}

a {
    text-decoration: none;
    color: inherit;
    transition: all 0.3s ease;
}

ul {
    list-style: none;
}

/* Utilities */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

.btn {
    display: inline-block;
    padding: 12px 30px;
    border-radius: 50px;
    font-weight: 700;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s ease;
}

.btn-primary {
    background: linear-gradient(45deg, #d4af37, #f2d06b);
    color: #0a192f;
    box-shadow: 0 4px 15px rgba(212, 175, 55, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(212, 175, 55, 0.5);
}

.btn-secondary {
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid var(--primary-color);
    color: var(--primary-color);
}

.btn-youtube {
    background-color: #FF0000;
    color: #ffffff;
    border-radius: 10px;
    padding: 12px 24px;
    font-weight: bold;
    display: inline-flex;
    align-items: center;
    gap: 10px;
    transition: all 0.3s ease;
    box-shadow: 0 4px 6px rgba(255, 0, 0, 0.2);
    border: none;
    text-decoration: none;
    margin-top: 30px;
}

.btn-youtube:hover {
    background-color: #cc0000;
    transform: translateY(-2px);
    box-shadow: 0 6px 12px rgba(255, 0, 0, 0.3);
    color: #ffffff;
}

.section-title {
    font-family: var(--font-serif);
    font-size: 2.5rem;
    text-align: center;
    margin-bottom: 40px;
    color: var(--primary-color);
    position: relative;
    display: inline-block;
    left: 50%;
    transform: translateX(-50%);
    white-space: nowrap;
}

.section-title::after {
    content: '';
    display: block;
    width: 60px;
    height: 3px;
    background: var(--primary-color);
    margin: 10px auto 0;
}

.section-desc {
    text-align: center;
    margin-bottom: 20px;
}

.glass-card {
    background: var(--glass-bg);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid var(--glass-border);
    border-radius: 20px;
    padding: 40px;
    box-shadow: var(--glass-shadow);
}

/* Header */
.header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    background: rgba(10, 25, 47, 0.85);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--glass-border);
}

.header-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 15px 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo img {
    height: 40px;
    width: auto;
}

.nav {
    display: flex;
    align-items: center;
    gap: 30px;
}

.nav a {
    font-size: 0.95rem;
    font-weight: 500;
}

.nav a:not(.btn):hover {
    color: var(--primary-color);
}

/* Hero */
.hero {
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
    padding-top: 80px;
}

.hero-background {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: url('hero_bg.png');
    background-size: cover;
    background-position: center;
    opacity: 0.6;
    z-index: -1;
}

.hero-content {
    text-align: center;
    max-width: 800px;
    padding: 0 20px;
    z-index: 1;
}

.hero-subtitle {
    font-size: 1.2rem;
    letter-spacing: 0.2em;
    color: var(--primary-color);
    margin-bottom: 20px;
    font-weight: 700;
}

.hero-title {
    font-family: var(--font-serif);
    font-size: 4rem;
    line-height: 1.2;
    margin-bottom: 30px;
    background: linear-gradient(to right, #fff, #a5a5a5);
    background-clip: text;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero-text {
    font-size: 1.1rem;
    color: var(--text-muted);
    margin-bottom: 40px;
}

/* Concept */
.concept-content {
    text-align: center;
    max-width: 800px;
    margin: 0 auto;
}

.concept p {
    margin-bottom: 20px;
    font-size: 1.1rem;
}

.highlight-text {
    font-size: 1.5rem !important;
    gap: 40px;
    align-items: center;
    max-width: 1000px;
    margin: 0 auto;
}

.lecturer-image {
    flex: 0 0 400px;
    height: 400px;
    border-radius: 15px;
    overflow: hidden;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
}

.lecturer-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}

.lecturer-info {
    flex: 1;
}

.lecturer-info h3 {
    font-family: var(--font-serif);
    font-size: 2rem;
    margin-bottom: 25px;
    color: var(--primary-color);
}

.lecturer-bio {
    font-size: 1rem;
    color: var(--text-muted);
    text-align: left;
}

.lecturer-info .position {
    font-size: 1rem;
    font-family: var(--font-main);
    color: var(--text-muted);
    font-weight: 400;
}

.lecturer-catch {
    font-size: 1.2rem;
    font-weight: 700;
    margin-bottom: 30px;
    color: var(--text-muted);
    margin-top: -30px;
}

.seminar-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(450px, 1fr));
    gap: 30px;
}

.seminar-card {
    display: flex;
    flex-direction: column;
    height: 100%;
    transition: transform 0.3s ease;
}

.seminar-card:hover {
    transform: translateY(-5px);
    border-color: var(--primary-color);
}

.seminar-header {
    margin-bottom: 25px;
    text-align: center;
}

.tag {
    display: inline-block;
    padding: 5px 15px;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 700;
    margin-bottom: 15px;
}

.tag.beginner {
    background: #4caf50;
    color: #fff;
    font-size: 1.2rem
}

.tag.intermediate {
    background: #ff9800;
    color: #fff;
    font-size: 1.2rem
}

.seminar-header h3 {
    font-family: var(--font-serif);
    font-size: 1.8rem;
    line-height: 1.4;
}

.seminar-body {
    flex: 1;
    display: flex;
    flex-direction: column;
}

.recommend-box {
    background: rgba(255, 255, 255, 0.03);
    padding: 20px;
    border-radius: 10px;
    margin-bottom: 25px;
}

.recommend-box h4 {
    color: var(--primary-color);
    margin-bottom: 10px;
    font-size: 1rem;
}

.recommend-box ul li {
    position: relative;
    padding-left: 20px;
    margin-bottom: 8px;
    font-size: 0.9rem;
}

.recommend-box ul li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--primary-color);
}

.seminar-desc {
    margin-bottom: 30px;
    font-size: 0.95rem;
    color: #ccc;
}

.schedule-list {
    margin-top: 30px;
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.schedule-item {
    background: rgba(10, 25, 47, 0.6);
    padding: 15px;
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 10px;
    border: 1px solid rgba(255, 255, 255, 0.05);
}

.schedule-item .date {
    font-weight: 1000;
    color: var(--primary-color);
}

.schedule-item .time {
    font-size: 0.9rem;
}

.schedule-item .place {
    display: inline-block;
    padding: 4px 10px;
    border: 1px solid var(--primary-color);
    background: rgba(212, 175, 55, 0.1);
    color: #fff;
    border-radius: 4px;
    font-size: 0.9rem;
    font-weight: 500;
    margin-right: auto;
}

.schedule-item .place_taimen {
    display: inline-block;
    padding: 4px 10px;
    background: rgba(212, 175, 55, 0.1);
    border: 1px solid #0005f7;
    border-radius: 4px;
    color: #fff;
    font-size: 0.9rem;
    font-weight: 500;
    margin-right: auto;
    text-decoration: none;
    transition: opacity 0.3s;
}

.schedule-item .place_taimen:hover {
    opacity: 0.8;
}

.seminar-desc h4 {
    font-size: 1.2rem;
    text-align: center;
}

.note {
    font-size: 0.8rem;
    color: var(--text-muted);
    margin-top: 20px;
}

.note a {
    text-decoration: underline;
    color: var(--primary-color);
}

.note a:hover {
    text-decoration: none;
}

/* Company */
.company-content {
    text-align: center;
    max-width: 800px;
    margin: 0 auto;
}

.company-content h3 {
    font-size: 1.5rem;
    margin-bottom: 20px;
    color: #ffccff;
}

.company-content p {
    margin-bottom: 30px;
    text-align: left;
    color: var(--text-muted);
}

.company-links {
    display: flex;
    justify-content: center;
    gap: 30px;
}

.text-link {
    color: var(--primary-color);
    text-decoration: underline;
}

.text-link:hover {
    color: #fff;
}

/* Footer */
.footer {
    background: #020c1b;
    padding: 60px 0 30px;
    border-top: 1px solid var(--glass-border);
    font-size: 0.8rem;
    color: #555;
}

.disclaimer {
    max-width: 900px;
    margin: 0 auto 40px;
    color: #fff;
}

.disclaimer h4 {
    color: #fff;
    margin-bottom: 15px;
}

.disclaimer p {
    margin-bottom: 20px;
    line-height: 1.5;
}

.copyright {
    text-align: center;
    color: #444;
}

/* Responsive */
@media (max-width: 768px) {
    .container {
        padding: 0 15px;
    }

    .glass-card {
        padding: 20px;
        border-radius: 15px;
    }

    .header-container {
        flex-direction: column;
        gap: 15px;
    }

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

    /* Hero adjustments for mobile */
    .hero {
        height: auto;
        min-height: 100vh;
        padding-top: 140px;
        padding-bottom: 60px;
    }

    .hero-title {
        font-size: 2.5rem;
    }

    .section-title {
        font-size: 1.5rem;
    }

    .seminar-header h3 {
        font-size: 1.4rem;
    }

    .lecturer-card {
        flex-direction: column;
        text-align: center;
    }

    .lecturer-image {
        flex: 0 0 auto;
        width: 100%;
        max-width: 300px;
    }

    .lecturer-catch {
        border-left: none;
        border-top: 4px solid var(--primary-color);
        padding-top: 15px;
        padding-left: 0;
    }

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

    /* Schedule adjustments for mobile */
    /* Schedule adjustments for mobile */
    .schedule-item {
        flex-direction: row;
        flex-wrap: wrap;
        text-align: left;
        align-items: center;
        gap: 10px;
        padding: 20px;
    }

    .schedule-item .date {
        font-size: 1.1rem;
        width: 100%;
        border-bottom: 1px solid rgba(255, 255, 255, 0.1);
        padding-bottom: 5px;
        margin-bottom: 5px;
    }

    .schedule-item .time {
        width: 100%;
    }

    .schedule-item .place,
    .schedule-item .place_taimen {
        margin-right: auto;
        font-size: 0.95rem;
    }

    .schedule-item .btn {
        margin-left: 0;
        margin-top: 0;
    }
}

/* Map & Office Locations */
.office-locations {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 30px;
    margin: 40px 0;
    text-align: left;
}

.office-item h4 {
    color: #ffccff;
    margin-bottom: 10px;
    font-size: 1.1rem;
}

.office-item p {
    font-size: 0.9rem;
    color: var(--text-muted);
    margin-bottom: 15px;
}

.map-container {
    border-radius: 10px;
    overflow: hidden;
    border: 1px solid var(--glass-border);
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.3);
}

@media (max-width: 768px) {
    .office-locations {
        grid-template-columns: 1fr;
    }
}

/* Concept Section */
.concept-content p {
    font-size: 0.95rem;
    line-height: 1.8;
    margin-bottom: 20px;
    text-align: center;
}

.text-highlight {
    font-weight: 700;
    color: var(--primary-color);
}

.concept-list {
    margin: 20px auto;
    padding-left: 0;
    list-style: none;
    width: fit-content;
}

.concept-list li {
    margin-bottom: 10px;
    position: relative;
    padding-left: 15px;
    text-align: left;
}

.concept-list li::before {
    content: '\2022';
    color: var(--primary-color);
    position: absolute;
    left: 0;
    font-weight: bold;
}