/* Base Styles */
:root {
    /* Colors */
    --primary-color: #1a365d;
    --secondary-color: #2c5282;
    --accent-pink: #EB6EA5;
    --accent-blue: #2162C1;
    --color-white: #ffffff;
    --color-black: #1a202c;

    /* Spacing System */
    --space-unit: 1rem;
    --space-xxs: calc(0.25 * var(--space-unit));
    --space-xs: calc(0.5 * var(--space-unit));
    --space-sm: calc(0.75 * var(--space-unit));
    --space-md: var(--space-unit);
    --space-lg: calc(1.5 * var(--space-unit));
    --space-xl: calc(2 * var(--space-unit));
    --space-xxl: calc(3 * var(--space-unit));

    /* Typography */
    --text-base: clamp(0.875rem, 0.8rem + 0.4vw, 1rem);
    /* 14px to 16px */
    --text-sm: clamp(0.8125rem, 0.75rem + 0.3vw, 0.875rem);
    /* 13px to 14px */
    --text-lg: clamp(1rem, 0.9rem + 0.5vw, 1.25rem);
    /* 16px to 20px */
    --text-xl: clamp(1.125rem, 1rem + 0.625vw, 1.5rem);
    /* 18px to 24px */
    --text-2xl: clamp(1.25rem, 1.1rem + 0.75vw, 1.75rem);
    /* 20px to 28px */
    --text-3xl: clamp(1.5rem, 1.2rem + 1.5vw, 2.25rem);
    /* 24px to 36px */

    box-sizing: border-box;
}

html {
    scroll-padding-top: 5rem;
    scroll-behavior: smooth;
}

@media (min-width: 768px) {
    html {
        scroll-padding-top: 6rem;
    }
}

@media (min-width: 1024px) {
    html {
        scroll-padding-top: 8rem;
    }
}

body {
    font-family: 'Noto Sans JP', sans-serif;
    font-size: var(--text-base);
    color: var(--color-white);
    line-height: 1.6;
    background:
        linear-gradient(to bottom,
            rgba(66, 106, 179, 0.7),
            rgba(241, 115, 172, 0.7)),
        url("../images/main_bg_img.jpg");
    background-size: cover;
    background-position: center;
    background-attachment: fixed;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    padding-top: 5rem;
    margin: 0;
    letter-spacing: 0.025rem;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    text-rendering: optimizeLegibility;
    overflow-x: hidden;

    @media (min-width: 768px) {
        padding-top: 6rem;
    }

    @media (min-width: 1024px) {
        padding-top: 8rem;
    }
}

body#page {
    background: none;
    padding-top: 0;
}

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--space-md);
    box-sizing: border-box;

    @media (min-width: 768px) {
        padding: 0 var(--space-lg);
    }
}

a {
    text-decoration: none;
}

section {
    padding: 2rem;
    color: var(--color-black);
}

h2 {
    font-size: var(--text-3xl);
    font-weight: 600;
    letter-spacing: 0;
    line-height: 1.4;
    text-transform: none;
}

h3 {
    background-color: var(--color-black);
    color: var(--color-white);
    font-size: var(--text-lg);
    font-weight: 500;
    border-radius: 4px;
    padding: var(--space-xs);
    margin-top: var(--space-xxl);
}

/* Regarding Section */
.regarding .container,
.access .container {
    background-color: rgba(255, 255, 255, 0.6);
    padding: var(--space-xl);
    border-radius: 4px;
}

.greeting {
    display: flex;
    gap: 3rem;
}

.greeting>div:first-child {
    flex: 0 0 calc(70% - 1.5rem);
    text-align: left;
}

.greeting>div:first-child p:last-child {
    text-align: right;
}

.greeting>div:last-child {
    flex: 0 0 calc(30% - 1.5rem);
    text-align: center;
}

.greeting img {
    max-width: 70%;
    height: auto;
    overflow: hidden;
}
.greeting p {
    text-align: left;
}

.org-list,
.committee-member {
    text-align: center;
}

.org-list p,
.committee-member p {
    text-align: left;
    font-size: var(--text-lg);
    display: inline-block;
}
.committee-member p {
    font-size: var(--text-base);
}

.org-list strong {
    display: inline-block;
    width: 350px;
    text-align: left;
}

.supporting-list {
    display: flex;
    gap: 2rem;
    justify-content: space-between;
}

.supporting-list ul {
    flex: 1;
    text-align: left;
    list-style: none;
    padding: 0;
    margin: 0;
}

.supporting-list li {
    position: relative;
    padding-left: 1.5em;
    margin-bottom: 0.5em;
    font-size: 0.9em;
}

.supporting-list li::before {
    content: '●';
    color: var(--accent-blue);
    position: absolute;
    left: 5px;
    top: 50%;
    transform: translateY(-50%);
    font-size: 0.5em;
}

.vice-chairman {
    display: flex;
    flex-wrap: wrap;
    gap: 2rem;
    justify-content: center;
    align-items: center;
    margin: var(--space-xl) 0;
}

.vice-chairman p {
    text-align: left;
    flex: 0 0 auto;
}

.vice-chairman img {
    max-width: 130px;
    height: auto;
    flex: 0 0 auto;
}

.access .map {
    width: 100%;
    margin-top: var(--space-xxl);
}

.access .map iframe {
    width: 100%;
    height: 400px;
}

.access .map p {
    text-align: center;
    margin-top: var(--space-xl);
}

/* Header */
.site-header {
    background-color: rgba(0, 0, 0, 0.9);
    position: fixed;
    width: 100%;
    top: 0;
    left: 0;
    padding: 0 var(--space-md);
    z-index: 1000;
    backdrop-filter: blur(5px);
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: relative;
    max-width: 1200px;
    margin: 0 auto;
}

.header-gnav {
    display: flex;
    gap: var(--space-xxl);
    padding: var(--space-sm);
    align-items: center;
    flex-wrap: wrap;
    justify-content: flex-end;
}

.header-gnav a {
    color: var(--color-white);
    transition: all 0.3s ease;
}

.header-gnav a.disabled {
    pointer-events: none;
    color: #888;
    cursor: not-allowed;
}

.header-gnav a:hover {
    color: var(--accent-pink);
    transform: translateY(-2px);
}

.hamburger-toggle {
    display: none;
}

.hamburger-icon {
    display: none;
    flex-direction: column;
    cursor: pointer;
    padding: var(--space-sm);
    z-index: 1001;
    position: relative;
}

.hamburger-icon span {
    width: 25px;
    height: 3px;
    background-color: var(--color-white);
    margin: 3px 0;
    transition: 0.3s;
}

@media (max-width: 767px) {
    .header-gnav {
        position: fixed;
        top: 0;
        right: -100%;
        width: 240px;
        gap: 0;
        padding: 0;
        height: 100vh;
        flex-direction: column;
        justify-content: flex-start;
        padding-top: 100px;
        background-color: rgba(0, 0, 0, 0.95);
        transition: right 0.3s ease;
        z-index: 999;
    }

    .header-gnav a {
        padding: var(--space-md) 0;
        display: block;
        width: 100%;
        text-align: center;
        border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    }

    .hamburger-icon {
        display: flex;
    }

    #hamburger-toggle:checked ~ .header-gnav {
        right: 0;
    }

    #hamburger-toggle:checked ~ .header-content .hamburger-icon span:nth-child(1) {
        transform: rotate(-45deg) translate(-6px, 6px);
    }

    #hamburger-toggle:checked ~ .header-content .hamburger-icon span:nth-child(2) {
        opacity: 0;
    }

    #hamburger-toggle:checked ~ .header-content .hamburger-icon span:nth-child(3) {
        transform: rotate(45deg) translate(-6px, -6px);
    }
}

.header-nav {
    display: flex;
    gap: var(--space-sm);
    align-items: center;
    flex-wrap: wrap;
    justify-content: flex-end;
}

.logo-link {
    text-decoration: none;
    background-color: white;
    padding: var(--space-xxs) var(--space-md);
    height: 60px;
}

.logo-img {
    height: 100%;
    display: flex;
    align-items: center;
}

.logo-img img {
    height: 100%;
    width: auto;
    max-height: 45px;
    object-fit: contain;
}

.logo-main {
    font-size: var(--text-2xl);
    font-weight: 700;
    color: var(--accent-pink);
}

.logo-sub {
    font-size: var(--text-sm);
    color: var(--color-white);
    margin-left: 10px;
}

/* Buttons */
.btn {
    padding: var(--space-sm) var(--space-xl);
    border-radius: 100vh;
    transition: all 0.3s ease;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    line-height: 1.2;
}

.btn.s-btn {
    padding: var(--space-xs) var(--space-unit);
    font-size: var(--text-sm);
    font-weight: 400;
    min-height: auto;
    letter-spacing: 0;
}

.btn-pink,
.btn-blue {
    font-size: var(--text-base);
    color: #FFF;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.4);
    position: relative;
    padding: var(--space-sm) var(--space-xl) var(--space-sm) var(--space-lg);
    white-space: nowrap;
    min-height: 44px;
    /* Minimum touch target size for mobile */

    @media (min-width: 768px) {
        font-size: var(--text-lg);
        padding: var(--space-sm) var(--space-xxl) var(--space-sm) var(--space-xl);
    }
}

.btn-pink {
    background-color: var(--accent-pink);
}

.btn-blue {
    background-color: var(--accent-blue);
}

.btn-outline-pink,
.btn-outline-blue {
    padding: var(--space-xs) var(--space-lg);
    border: 2px solid;
    background: transparent;
    transition: all 0.3s ease;
}

.btn-outline-pink {
    border-color: var(--accent-pink);
    color: var(--accent-pink);
}

.btn-outline-blue {
    border-color: var(--accent-blue);
    color: var(--accent-blue);
}

.btn-pink::after,
.btn-blue::after {
    content: 'arrow_forward_ios';
    font-family: 'Material Icons';
    font-weight: normal;
    font-style: normal;
    font-size: var(--text-base);
    line-height: 1;
    position: absolute;
    top: 0;
    right: 1rem;
    transition: transform 0.3s ease;
    display: flex;
    align-items: center;
    height: 100%;
}

.s-btn.btn-pink::after,
.s-btn.btn-blue::after {
    display: none;
}

.btn-pink:hover::after,
.btn-blue:hover::after {
    transform: translateX(4px);
}

.btn:hover {
    opacity: 0.9;
    transform: translateY(-2px);
}

.btn-outline-pink:hover,
.btn-outline-blue:hover {
    transform: none;
    opacity: 0.7;
}

/* Hero Section */
.hero {
    flex: 1;
    padding: var(--space-lg) 0;
    text-align: center;
    width: 100%;
    box-sizing: border-box;
    padding-top: 40px;
    /* Space for fixed header */
}

.announcement-banner {
    position: relative;
    padding: var(--space-sm) 0;
    text-align: center;
    margin: 0 auto var(--space-xl);
    overflow: hidden;
    max-width: 100%;
    width: 100%;
}

.announcement-text {
    position: relative;
    display: inline-block;
    color: white;
    font-weight: 600;
    background-color: var(--color-black);
    font-size: var(--text-xl);
    padding: var(--space-xs) var(--space-md);
    margin: 0;
    max-width: 100%;
    box-sizing: border-box;

    @media (min-width: 768px) {
        font-size: var(--text-2xl);
        padding: var(--space-xs) var(--space-lg);
    }

    @media (min-width: 1024px) {
        font-size: var(--text-3xl);
    }
}

.announcement-text::before,
.announcement-text::after {
    content: '';
    position: absolute;
    top: 0;
    width: 30px;
    height: 100%;
    background-color: var(--color-black);
    transform: skewX(-15deg);
}

.announcement-text::before {
    left: -15px;
    transform: skewX(15deg);
}

.announcement-text::after {
    right: -15px;
}

.tagline {
    font-size: var(--text-2xl);
    font-weight: 700;
    margin: 0 auto var(--space-xl);
    line-height: 1.4;
    text-shadow: 0 2px 3px rgba(0, 0, 0, 0.7);
    max-width: 100%;
    letter-spacing: 0;

    @media (min-width: 768px) {
        font-size: var(--text-3xl);
    }
}

.tagline span {
    font-size: var(--text-lg);
    margin-top: var(--space-sm);

    @media (min-width: 768px) {
        font-size: var(--text-xl);
    }
}

.logo-container {
    margin-bottom: var(--space-xxl);
    width: 100%;
    padding: 0 var(--space-md);
    box-sizing: border-box;
}

.logo {
    max-width: 100%;
    width: 100%;
    margin: 0 auto;
    padding: 0 var(--space-md);
    box-sizing: border-box;

    @media (min-width: 768px) {
        max-width: 80%;
        padding: 0;
    }

    @media (min-width: 1024px) {
        max-width: 740px;
    }
}

.logo img {
    width: 100%;
    height: auto;
    max-width: 100%;
    filter:
        drop-shadow(0 0 6px rgba(255, 255, 255, 0.9)) drop-shadow(0 0 12px rgba(255, 255, 255, 0.6));
}

.event-details {
    max-width: 740px;
    width: 100%;
    margin: 0 auto var(--space-xxl);
    text-align: left;
    padding: 0 var(--space-md);
    box-sizing: border-box;

    @media (min-width: 768px) {
        padding: 0;
    }
}

.event-detail {
    display: flex;
    flex-direction: column;
    margin-bottom: var(--space-lg);
    font-weight: 700;

    @media (min-width: 480px) {
        flex-direction: row;
        align-items: center;
    }
}

.event-detail:last-child {
    margin-bottom: 0;
}

.label {
    width: auto;
    text-align: left;
    font-size: var(--text-base);
    border-radius: 4px;
    background-color: var(--color-black);
    color: #FFF;
    padding: var(--space-xxs) var(--space-sm);
    margin: 0 0 var(--space-xs);
    display: inline-block;

    @media (min-width: 480px) {
        width: 80px;
        text-align: center;
        margin: 0 var(--space-lg) 0 0;
    }

    @media (min-width: 768px) {
        font-size: var(--text-lg);
        padding: var(--space-xs) var(--space-sm);
    }
}

.value {
    font-size: var(--text-xl);
    text-shadow: 0 2px 3px rgba(0, 0, 0, 0.7);
    letter-spacing: 0.1em;
    line-height: 1.3;

    @media (min-width: 768px) {
        font-size: var(--text-2xl);
    }
}

.value span {
    font-size: var(--text-3xl);

    @media (min-width: 768px) {
        font-size: 3rem;
    }
}

.cta-buttons {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-md);
    margin: 0 auto var(--space-xxl);
    width: 100%;
    max-width: 400px;
    padding: 0 var(--space-md);
    box-sizing: border-box;

    @media (min-width: 640px) {
        flex-direction: row;
        justify-content: center;
        max-width: 100%;
        gap: var(--space-xl);
    }

    @media (min-width: 1024px) {
        gap: 60px;
    }

    .btn {
        width: 100%;
        max-width: 280px;

        @media (min-width: 480px) {
            max-width: 320px;
        }

        @media (min-width: 640px) {
            width: auto;
            min-width: 200px;
        }
    }
}

/* Footer */
.footer {
    position: relative;
    padding: var(--space-xxl) 0 var(--space-xl);
    text-align: center;
    font-size: var(--text-sm);
    line-height: 1.8;
    overflow: hidden;
    clip-path: polygon(0 15%, 100% 0, 100% 100%, 0 100%);
    background-color: #000;
    margin-top: var(--space-xxl);

    @media (min-width: 768px) {
        padding: 80px 0 40px;
        clip-path: polygon(0 25%, 100% 0, 100% 100%, 0 100%);
        font-size: 0.9rem;
    }
}

.footer .container {
    position: relative;
    z-index: 1;
    transform: none;
    padding: 0 var(--space-md);

    @media (min-width: 768px) {
        padding: 0 var(--space-lg);
    }
}

.footer p {
    margin: var(--space-xs) 0;
    line-height: 1.6;
}

.copyright {
    margin-top: var(--space-lg);
    opacity: 0.7;
    font-size: var(--text-sm);

    @media (min-width: 768px) {
        margin-top: var(--space-xl);
    }
}

/* Responsive Design */
@media (max-width: 767px) {
    .header-nav {
        flex-direction: column;
        width: 100%;
        gap: var(--space-xs);
        margin-top: var(--space-sm);
        min-height: 30px;

        .btn {
            display: none;
        }
    }

    .hero {padding-top: 20px;}

    .logo {
        text-align: center;

        img {
            margin: 0 auto;
        }
    }

    .event-details .event-detail {
        flex-direction: column;
        align-items: flex-start;

        .label {
            margin-bottom: var(--space-xs);
        }
    }

    .footer {
        clip-path: polygon(0 10%, 100% 0, 100% 100%, 0 100%);
        padding: var(--space-xl) 0 var(--space-lg);
    }

    .greeting {
        flex-direction: column;
    }

    .greeting>div {
        flex: none;
    }

    .supporting-list {
        flex-direction: column;
    }

    .contents-img {
        height: 15rem;
    }

    .contents-img h1 {
        font-size: 2rem;
        font-weight: 300;
        letter-spacing: 0;
        line-height: 1.4;
        text-transform: none;
    }

    .org-list strong {
        width: auto;
        display: block;
    }
}

.contents-img {
    align-items: center;
    color: var(--color-white);
    display: flex;
    height: 21rem;
    padding-top: var(--space-xl);
    margin-top: 5rem;
    position: relative;
    z-index: 0;
}

.contents-img:before {
    content: "";
    height: 100%;
    left: 0;
    position: absolute;
    top: 0;
    width: 100%;
    z-index: -1;
    background-color: rgba(0, 0, 0, 80%);
}

.contents-img h1 {
    font-size: 4rem;
    font-weight: 300;
    letter-spacing: 0;
    line-height: 1.4;
    text-align: center;
    text-transform: none;
    color: var(--color-white);
}

.contents .contents-img {
    background-image: url(../images/main_bg_img.jpg);
    background-size: cover;
    background-position: center center;
}

/* Topnews Styles */
.topnews > div {
    margin: var(--space-xl) auto;
    background-color: rgba(0, 0, 0, 0.5);
    padding: var(--space-md) var(--space-xl);
    border-radius: 4px;
}

.topnews h4 {
    font-size: var(--text-xl);
    margin: var(--space-md) 0;
    color: var(--color-white);
    font-weight: bold;
    text-shadow: 0 2px 3px rgba(0, 0, 0, 0.7);
    text-align: left;
    border-bottom: 1px solid #FFF;
}

.topnews ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.topnews li {
    display: flex;
    align-items: flex-start;
    text-align: left;
    margin-bottom: var(--space-sm);
    color: var(--color-white);
}

.topnews li a {
    color: var(--accent-pink);
    text-decoration: underline;
}
.topnews li a:hover {
    opacity: 0.8;
    text-decoration: none;
}
.news-date {
    flex-shrink: 0;
    width: 120px;
    font-weight: bold;
    margin-right: var(--space-md);
}

@media (max-width: 767px) {
    .topnews li {
        flex-direction: column;
    }
    .news-date {
        width: auto;
        margin-right: 0;
        margin-bottom: var(--space-xs);
    }
}