/* ========================================
   PH Symposium 2026 - Style Sheet
   Pharmaco-Hematology Symposium
   ======================================== */

/* CSS Variables */
:root {
    --color-primary: #5b2c6f;
    --color-primary-dark: #3d1a4a;
    --color-primary-light: #7d3c98;
    --color-accent: #9b59b6;
    --color-accent-light: #d7bde2;
    --color-secondary: #1a5276;
    --color-bg: #ffffff;
    --color-bg-alt: #f8f5fa;
    --color-bg-dark: #1a1a2e;
    --color-text: #1e293b;
    --color-text-light: #64748b;
    --color-text-muted: #94a3b8;
    --color-border: #e2e8f0;
    
    --font-display: 'Playfair Display', 'Outfit', serif;
    --font-heading: 'Outfit', sans-serif;
    --font-body: 'Noto Sans JP', sans-serif;
    
    --transition-fast: 0.2s ease;
    --transition-medium: 0.3s ease;
    --transition-slow: 0.5s ease;
    
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
}

/* Reset & Base */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: var(--font-body);
    color: var(--color-text);
    background-color: #f5f0f7;
    line-height: 1.8;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* 固定背景 */
body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, 
        #f5eef8 0%, 
        #ebdef0 25%, 
        #d7bde2 50%,
        #bb8fce 75%,
        #9b59b6 100%
    );
    opacity: 0.3;
    z-index: -10;
    pointer-events: none;
}

body::after {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: 
        radial-gradient(ellipse at 30% 20%, rgba(255, 255, 255, 0.8) 0%, transparent 50%),
        radial-gradient(ellipse at 70% 80%, rgba(91, 44, 111, 0.1) 0%, transparent 40%);
    z-index: -9;
    pointer-events: none;
}

a {
    text-decoration: none;
    color: inherit;
    transition: color var(--transition-fast);
}

ul {
    list-style: none;
}

img {
    max-width: 100%;
    height: auto;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

/* ========================================
   Header & Navigation
   ======================================== */

.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: transparent;
    transition: all var(--transition-medium);
}

.header.scrolled {
    background: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow-md);
}

.nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 40px;
    max-width: 1400px;
    margin: 0 auto;
}

.nav-logo {
    display: flex;
    align-items: baseline;
    gap: 4px;
}

.logo-text {
    font-family: var(--font-display);
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--color-primary);
    letter-spacing: -0.02em;
}

.logo-sub {
    font-family: var(--font-heading);
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--color-primary-light);
    margin-left: 2px;
}

.logo-year {
    font-family: var(--font-heading);
    font-size: 0.875rem;
    font-weight: 400;
    color: var(--color-text-light);
    margin-left: 8px;
}

.nav-links {
    display: flex;
    gap: 32px;
}

.nav-links a {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--color-text);
    position: relative;
    padding: 4px 0;
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--color-primary);
    transition: width var(--transition-fast);
}

.nav-links a:hover::after {
    width: 100%;
}

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 5px;
}

.nav-toggle span {
    width: 24px;
    height: 2px;
    background: var(--color-text);
    transition: all var(--transition-fast);
}

/* ========================================
   Hero Section
   ======================================== */

.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

.hero-bg {
    display: none;
}

.hero-content {
    position: relative;
    text-align: center;
    padding: 40px 24px;
    animation: fadeInUp 1s ease-out;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.hero-badge {
    display: inline-block;
    font-family: var(--font-heading);
    font-size: 0.75rem;
    font-weight: 500;
    letter-spacing: 0.05em;
    color: var(--color-primary);
    background: rgba(91, 44, 111, 0.1);
    padding: 10px 24px;
    border-radius: 100px;
    margin-bottom: 32px;
}

.hero-title {
    display: flex;
    flex-direction: column;
    align-items: center;
    margin-bottom: 32px;
}

.title-sub {
    font-family: var(--font-heading);
    font-size: clamp(1rem, 2vw, 1.25rem);
    font-weight: 500;
    color: var(--color-text-light);
    letter-spacing: 0.1em;
    margin-bottom: 8px;
}

.title-main {
    font-family: var(--font-heading);
    font-size: clamp(2.5rem, 8vw, 5rem);
    font-weight: 700;
    color: var(--color-primary);
    letter-spacing: -0.02em;
    line-height: 1.1;
}

.title-year {
    font-family: var(--font-heading);
    font-size: clamp(1.25rem, 3vw, 2rem);
    font-weight: 300;
    color: var(--color-text-light);
    letter-spacing: 0.15em;
    margin-top: 8px;
}

.hero-theme {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    margin-bottom: 40px;
    padding: 24px 32px;
    background: rgba(255, 255, 255, 0.8);
    border-radius: 8px;
    border-left: 4px solid var(--color-primary);
}

.theme-label {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--color-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.1em;
}

.theme-text {
    font-size: clamp(1rem, 2.5vw, 1.375rem);
    font-weight: 500;
    color: var(--color-text);
    line-height: 1.6;
}

.hero-info {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 32px;
    margin-bottom: 48px;
}

.hero-date,
.hero-venue {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 6px;
}

.hero-info .label {
    font-size: 0.6875rem;
    font-weight: 500;
    color: var(--color-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.15em;
}

.hero-info .value {
    font-size: 1.125rem;
    font-weight: 500;
    color: var(--color-text);
}

.hero-divider {
    width: 1px;
    height: 40px;
    background: var(--color-border);
}

.hero-cta {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: var(--color-primary);
    color: white;
    padding: 16px 36px;
    border-radius: 4px;
    font-weight: 500;
    font-size: 0.9375rem;
    letter-spacing: 0.02em;
    transition: all var(--transition-fast);
    box-shadow: var(--shadow-lg);
}

.hero-cta:hover {
    background: var(--color-primary-dark);
    transform: translateY(-2px);
    box-shadow: var(--shadow-xl);
}

.hero-scroll {
    position: absolute;
    bottom: 40px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    color: var(--color-text-muted);
    font-size: 0.6875rem;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    animation: fadeIn 1s ease-out 0.5s both;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

.scroll-line {
    width: 1px;
    height: 40px;
    background: linear-gradient(to bottom, var(--color-text-muted), transparent);
    animation: scrollBounce 2s ease-in-out infinite;
}

@keyframes scrollBounce {
    0%, 100% { transform: scaleY(1); }
    50% { transform: scaleY(0.6); }
}

/* ========================================
   Section Common Styles
   ======================================== */

.section {
    padding: 60px 0;
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.8s ease-out;
}

.section.visible {
    opacity: 1;
    transform: translateY(0);
}

.section-header {
    margin-bottom: 32px;
}

.section-title {
    font-family: var(--font-heading);
    font-size: 1.75rem;
    font-weight: 600;
    color: var(--color-text);
    letter-spacing: -0.01em;
}

/* ========================================
   About Section
   ======================================== */

.about {
    background: transparent;
}

.about-content {
    max-width: 800px;
    margin: 0 auto;
    background: var(--color-bg);
    padding: 48px;
    border-radius: 8px;
    box-shadow: var(--shadow-md);
}

.about-content p {
    font-size: 1rem;
    line-height: 2;
    color: var(--color-text);
    margin-bottom: 24px;
}

.about-content p:last-child {
    margin-bottom: 0;
}

.about-content .note {
    font-size: 0.875rem;
    color: var(--color-text-light);
    padding-top: 16px;
    border-top: 1px solid var(--color-border);
    margin-top: 24px;
}

/* ========================================
   Info Section
   ======================================== */

.info {
    background: transparent;
}

.info-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
    margin-bottom: 40px;
}

.info-card {
    background: var(--color-bg);
    padding: 32px;
    border-radius: 8px;
    box-shadow: var(--shadow-sm);
    border-top: 3px solid var(--color-primary);
}

.info-card h3 {
    font-family: var(--font-heading);
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--color-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.1em;
    margin-bottom: 12px;
}

.info-main {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: 4px;
}

.info-sub {
    font-size: 0.9375rem;
    color: var(--color-text-light);
}

.info-note {
    font-size: 0.8125rem;
    color: var(--color-text-muted);
    margin-top: 8px;
}

.participation-info {
    background: var(--color-bg);
    padding: 48px;
    border-radius: 8px;
    box-shadow: var(--shadow-sm);
}

.participation-info h3 {
    font-family: var(--font-heading);
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: 24px;
}

.participation-list {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.participation-list li {
    position: relative;
    padding-left: 24px;
    font-size: 0.9375rem;
    color: var(--color-text-light);
    line-height: 1.7;
}

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

.fee-list li {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 16px 24px;
    background: var(--color-bg-alt);
    border-radius: 4px;
}

.fee-list li::before {
    display: none;
}

.fee-category {
    font-weight: 500;
    color: var(--color-text);
}

.fee-amount {
    font-weight: 600;
    color: var(--color-primary);
}

.participation-info .note {
    font-size: 0.8125rem;
    color: var(--color-text-muted);
    margin-top: 20px;
    padding-top: 20px;
    border-top: 1px solid var(--color-border);
}

/* ========================================
   Program Section
   ======================================== */

.program {
    background: transparent;
}

.program-block {
    background: var(--color-bg);
    padding: 40px;
    border-radius: 8px;
    box-shadow: var(--shadow-sm);
    margin-bottom: 32px;
}

.program-block:last-child {
    margin-bottom: 0;
}

.program-block-title {
    font-family: var(--font-heading);
    font-size: 1.375rem;
    font-weight: 600;
    color: var(--color-primary);
    margin-bottom: 8px;
}

.program-block-subtitle {
    font-size: 0.875rem;
    color: var(--color-text-light);
    margin-bottom: 24px;
}

.speaker-card {
    background: var(--color-bg-alt);
    padding: 24px 32px;
    border-radius: 8px;
    border-left: 4px solid var(--color-accent);
}

.speaker-card.featured {
    background: linear-gradient(135deg, var(--color-bg-alt) 0%, rgba(155, 89, 182, 0.1) 100%);
    border-left-color: var(--color-primary);
}

.speaker-name {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: 4px;
}

.speaker-affiliation {
    font-size: 0.9375rem;
    color: var(--color-text-light);
}

.symposium-theme {
    font-size: 1.125rem;
    font-weight: 500;
    color: var(--color-text);
    padding: 20px 24px;
    background: rgba(91, 44, 111, 0.08);
    border-radius: 8px;
    margin-bottom: 24px;
    text-align: center;
}

.speakers-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
}

.award {
    border-left: 4px solid var(--color-accent);
}

.award-description {
    font-size: 1rem;
    color: var(--color-text);
    line-height: 1.8;
}

/* ========================================
   Registration Section
   ======================================== */

.registration {
    background: transparent;
}

.registration-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 32px;
}

.registration-card {
    background: var(--color-bg);
    padding: 48px;
    border-radius: 8px;
    box-shadow: var(--shadow-md);
    position: relative;
}

.deadline-badge {
    display: flex;
    flex-direction: column;
    gap: 4px;
    margin-bottom: 20px;
    padding: 16px 20px;
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-light) 100%);
    border-radius: 8px;
    color: white;
}

.deadline-badge.secondary {
    background: linear-gradient(135deg, var(--color-secondary) 0%, #2874a6 100%);
}

.deadline-label {
    font-size: 0.75rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    opacity: 0.9;
}

.deadline-date {
    font-size: 1.125rem;
    font-weight: 600;
}

.registration-card h3 {
    font-family: var(--font-heading);
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: 16px;
}

.registration-card > p {
    font-size: 0.9375rem;
    color: var(--color-text-light);
    margin-bottom: 24px;
    line-height: 1.7;
}

.registration-actions {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: 24px;
}

.btn-register {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: var(--color-primary);
    color: white;
    padding: 14px 28px;
    border-radius: 4px;
    font-weight: 500;
    transition: all var(--transition-fast);
}

.btn-register:hover {
    background: var(--color-primary-dark);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-register svg {
    transition: transform var(--transition-fast);
}

.btn-register:hover svg {
    transform: translate(2px, -2px);
}

.abstract-info {
    background: var(--color-bg);
    padding: 48px;
    border-radius: 8px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    border: 1px solid var(--color-border);
}

.abstract-info h3 {
    font-family: var(--font-heading);
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: 20px;
}

.fee-details {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.fee-details li {
    font-size: 0.9375rem;
    color: var(--color-text-light);
    padding-left: 20px;
    position: relative;
}

.fee-details li::before {
    content: '•';
    position: absolute;
    left: 0;
    color: var(--color-primary);
}

.abstract-info .note {
    font-size: 0.8125rem;
    color: var(--color-text-muted);
    margin-top: 20px;
    padding-top: 16px;
    border-top: 1px solid var(--color-border);
}

/* ========================================
   Contact Section
   ======================================== */

.contact {
    background: transparent;
}

.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 24px;
    margin-bottom: 56px;
}

.organizer-card {
    background: var(--color-bg-alt);
    padding: 40px;
    border-radius: 8px;
    text-align: center;
}

.organizer-card h3 {
    font-family: var(--font-heading);
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--color-text-muted);
    margin-bottom: 16px;
    text-transform: uppercase;
    letter-spacing: 0.1em;
}

.organizer-name {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: 8px;
}

.organizer-title {
    font-size: 0.9375rem;
    color: var(--color-text-light);
}

.contact-info {
    text-align: center;
}

.contact-info h3 {
    font-family: var(--font-heading);
    font-size: 1rem;
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: 24px;
}

.contact-details {
    display: flex;
    justify-content: center;
    gap: 24px;
    flex-wrap: wrap;
}

.contact-item {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 0.9375rem;
    color: var(--color-text);
    padding: 16px 24px;
    background: var(--color-bg-alt);
    border-radius: 4px;
    transition: all var(--transition-fast);
}

.contact-item.address {
    flex-direction: column;
    align-items: flex-start;
    gap: 4px;
}

.contact-label {
    font-family: var(--font-heading);
    font-size: 0.6875rem;
    font-weight: 600;
    color: var(--color-primary);
    text-transform: uppercase;
    letter-spacing: 0.1em;
}

.contact-value {
    color: var(--color-text);
}

a.contact-item:hover {
    background: var(--color-primary);
}

a.contact-item:hover .contact-label,
a.contact-item:hover .contact-value {
    color: white;
}

/* ========================================
   Footer
   ======================================== */

.footer {
    background: var(--color-bg-dark);
    color: white;
    padding: 64px 0 40px;
}

.footer-content {
    text-align: center;
    margin-bottom: 40px;
}

.footer-logo {
    display: inline-flex;
    align-items: baseline;
    gap: 4px;
    margin-bottom: 16px;
}

.footer .logo-text {
    color: white;
}

.footer .logo-sub {
    color: rgba(255, 255, 255, 0.7);
}

.footer .logo-year {
    color: rgba(255, 255, 255, 0.6);
}

.footer-text {
    font-size: 0.875rem;
    color: rgba(255, 255, 255, 0.6);
}

.footer-venue {
    font-size: 0.8125rem;
    color: rgba(255, 255, 255, 0.4);
    margin-top: 8px;
}

.copyright {
    text-align: center;
    font-size: 0.75rem;
    color: rgba(255, 255, 255, 0.3);
    padding-top: 24px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

/* ========================================
   Responsive Design
   ======================================== */

@media (max-width: 1024px) {
    .registration-content {
        grid-template-columns: 1fr;
    }
    
    .speakers-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .nav {
        padding: 16px 24px;
    }
    
    .nav-links {
        position: fixed;
        top: 0;
        right: -100%;
        width: 280px;
        height: 100vh;
        background: var(--color-bg);
        flex-direction: column;
        padding: 80px 40px 40px;
        gap: 24px;
        transition: right var(--transition-medium);
        box-shadow: var(--shadow-xl);
    }
    
    .nav-links.active {
        right: 0;
    }
    
    .nav-toggle {
        display: flex;
        z-index: 100;
    }
    
    .nav-toggle.active span:nth-child(1) {
        transform: rotate(45deg) translate(5px, 5px);
    }
    
    .nav-toggle.active span:nth-child(2) {
        opacity: 0;
    }
    
    .nav-toggle.active span:nth-child(3) {
        transform: rotate(-45deg) translate(5px, -5px);
    }
    
    .hero-info {
        flex-direction: column;
        gap: 20px;
    }
    
    .hero-divider {
        width: 40px;
        height: 1px;
    }
    
    .hero-theme {
        padding: 20px 24px;
    }
    
    .section {
        padding: 48px 0;
    }
    
    .section-title {
        font-size: 1.5rem;
    }
    
    .info-grid {
        grid-template-columns: 1fr;
    }
    
    .contact-grid {
        grid-template-columns: 1fr;
    }
    
    .contact-details {
        flex-direction: column;
        align-items: center;
        gap: 12px;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 16px;
    }
    
    .about-content,
    .participation-info {
        padding: 28px;
    }
    
    .program-block {
        padding: 28px;
    }
    
    .registration-card,
    .abstract-info {
        padding: 28px;
    }
    
    .fee-list li {
        flex-direction: column;
        align-items: flex-start;
        gap: 4px;
    }
}