/* styles.css */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Inter', Arial, sans-serif;
    line-height: 1.6;
    color: #333;
    background: linear-gradient(135deg, #f5f7fa 0%, #e8ecf0 100%);
    padding: 20px;
    min-height: 100vh;
}

.container {
    max-width: 1000px;
    margin: 0 auto;
    background: white;
    border-radius: 12px;
    box-shadow: 0 8px 32px rgba(0,0,0,0.12);
    overflow: hidden;
    animation: fadeInUp 0.6s ease-out;
}

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

.header {
    background: linear-gradient(135deg, #2c3e50 0%, #34495e 100%);
    color: white;
    padding: 30px 20px;
    text-align: center;
    position: relative;
    box-shadow: 0 4px 20px rgba(44, 62, 80, 0.3);
}

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

.supporter-link {
    display: inline-block !important;
    margin: 0 8px;
    padding: 8px 16px;
    background: white !important;
    color: #2c3e50 !important;
    text-decoration: none !important;
    border-radius: 4px;
    font-size: 14px !important;
    font-weight: 600 !important;
    transition: all 0.2s ease;
    visibility: visible !important;
    opacity: 1 !important;
    position: relative !important;
    z-index: 999 !important;
}

.supporter-link:hover {
    background: #f8f9fa !important;
    transform: translateY(-1px);
}

h1 {
    font-size: 4.0rem;
    font-weight: 900;
    margin: 0;
    color: rgba(255, 255, 255, 0.4);
    text-shadow: 0 4px 8px rgba(0,0,0,0.4);
    line-height: 0.8;
    letter-spacing: -0.02em;
    text-transform: uppercase;
    animation: titleGlow 2s ease-in-out infinite alternate;
}

@keyframes titleGlow {
    from {
        text-shadow: 0 4px 8px rgba(0,0,0,0.4);
    }
    to {
        text-shadow: 0 4px 8px rgba(0,0,0,0.4), 0 0 20px rgba(255,255,255,0.1);
    }
}

.version {
    position: absolute;
    top: 5px;
    right: 10px;
    font-size: 10px;
    color: rgba(255,255,255,0.4);
    padding: 0;
}

.content {
    padding: 30px;
}

.year-section {
    margin-bottom: 20px;
    border: 1px solid #e9ecef;
    border-radius: 8px;
    overflow: hidden;
    background: white;
    transition: all 0.3s ease;
    animation: slideInFromLeft 0.5s ease-out;
    animation-fill-mode: both;
}

.year-section:nth-child(1) { animation-delay: 0.1s; }
.year-section:nth-child(2) { animation-delay: 0.2s; }
.year-section:nth-child(3) { animation-delay: 0.3s; }
.year-section:nth-child(4) { animation-delay: 0.4s; }
.year-section:nth-child(5) { animation-delay: 0.5s; }

.year-section:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(0,0,0,0.1);
}

@keyframes slideInFromLeft {
    from {
        opacity: 0;
        transform: translateX(-30px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

.year-header {
    background: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%);
    padding: 15px 20px;
    font-weight: 700;
    font-size: 1.2rem;
    color: #2c3e50;
    cursor: pointer;
    border-bottom: 1px solid #e9ecef;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}


.year-header-left {
    display: flex;
    align-items: center;
    gap: 20px;
}

.year-supporters {
    display: flex;
    gap: 45px;
}

.year-supporter-link {
    color: #2c3e50 !important;
    text-decoration: none !important;
    font-size: 0.7rem;
    font-weight: 400;
    transition: color 0.2s ease;
}

.year-supporter-link:hover {
    color: #007bff !important;
}

.year-header:hover {
    background: linear-gradient(135deg, #e9ecef 0%, #dee2e6 100%);
}

.year-content {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

.year-content.active {
    max-height: 2000px;
    animation: expandContent 0.4s ease-out;
}

@keyframes expandContent {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.year-inner {
    padding: 20px;
}

.session {
    margin-bottom: 20px;
    padding: 20px;
    background: linear-gradient(135deg, #f8f9fa 0%, #ffffff 100%);
    border-radius: 8px;
    border-left: 4px solid #2c3e50;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    overflow: hidden;
    animation: slideInUp 0.5s ease-out;
}

.session::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, rgba(52, 152, 219, 0.05) 0%, rgba(41, 128, 185, 0.05) 100%);
    opacity: 0;
    transition: opacity 0.3s ease;
    z-index: 0;
}

.session:hover {
    transform: translateY(-3px) scale(1.01);
    box-shadow: 0 12px 30px rgba(0,0,0,0.15);
    border-left-color: #3498db;
}

.session:hover::before {
    opacity: 1;
}

.session > * {
    position: relative;
    z-index: 1;
}

@keyframes slideInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.session:last-child {
    margin-bottom: 0;
}

.session-time {
    color: #d2691e;
    font-weight: 700;
    font-size: 0.85rem;
    margin-bottom: 8px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    text-shadow: 0 1px 2px rgba(210, 105, 30, 0.2);
}

.session-speaker {
    color: #2c3e50;
    font-size: 1.2rem;
    margin-bottom: 10px;
    font-weight: 700;
    transition: color 0.3s ease;
}

.session:hover .session-speaker {
    color: #3498db;
}

.session-description {
    color: #555;
    font-size: 0.95rem;
    line-height: 1.7;
    transition: color 0.3s ease;
}

.session:hover .session-description {
    color: #444;
}

.lunch {
    background: linear-gradient(135deg, #e8f5e8 0%, #d4edda 100%);
    color: #2d5a2d;
    text-align: center;
    padding: 18px;
    border-radius: 8px;
    font-weight: 700;
    margin: 15px 0;
    border-left: 4px solid #28a745;
    transition: all 0.3s ease;
    animation: pulse 2s ease-in-out infinite;
}

.lunch:hover {
    transform: scale(1.02);
    box-shadow: 0 8px 20px rgba(40, 167, 69, 0.2);
}

@keyframes pulse {
    0%, 100% {
        transform: scale(1);
    }
    50% {
        transform: scale(1.01);
    }
}

.arrow {
    transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    font-size: 1.2rem;
    color: #3498db;
}

.year-header.active .arrow {
    transform: rotate(90deg);
    color: #2980b9;
}

@media (max-width: 768px) {
    body {
        padding: 10px;
        background: linear-gradient(135deg, #f5f7fa 0%, #e8ecf0 100%);
    }
    
    .container {
        border-radius: 8px;
        box-shadow: 0 4px 20px rgba(0,0,0,0.1);
    }
    
    .header {
        padding: 20px 15px;
        background: linear-gradient(135deg, #2c3e50 0%, #34495e 100%);
    }
    
    .content {
        padding: 20px 15px;
    }
    
    h1 {
        font-size: 2.5rem;
        line-height: 0.85;
        font-weight: 900;
    }
    
    .year-supporters {
        flex-direction: column;
        gap: 15px;
        margin-top: 10px;
    }
    
    .year-header-left {
        flex-direction: column;
        align-items: flex-start;
        gap: 10px;
    }
    
    .version {
        position: static;
        margin-top: 10px;
        display: inline-block;
    }
    
    .year-content.active {
        max-height: 5000px;
    }
    
    .session {
        padding: 15px;
        margin-bottom: 15px;
    }
    
    .session:hover {
        transform: translateY(-1px) scale(1.005);
    }
    
    .year-section:hover {
        transform: translateY(-1px);
    }
}