/* Babytop Seminar Site - Base Layout and Structure */

/* CSS Custom Properties for theming */
:root {
    /* Layout */
    --container-width: 50%;
    --container-max-width: 600px;
    --container-min-width: 400px;
    --container-padding: 20px;
    --container-margin: 20px 0;
    
    /* Typography */
    --font-family-primary: "Times New Roman", Times, serif;
    --font-size-small: 13px;
    --font-size-normal: 14px;
    --font-size-large: 17px;
    --font-size-title: 29px;
    --font-size-semester-title: 36px;
    --font-size-semester-title-mobile: 20px;
    --font-size-title-mobile: 24px;
    --font-size-talk-title: 16px;
    --font-size-talk-title-mobile: 14px;
    --font-size-talk-speaker: 14px;
    --font-size-talk-speaker-mobile: 13px;
    
    /* Spacing */
    --spacing-xs: 5px;
    --spacing-sm: 10px;
    --spacing-md: 15px;
    --spacing-lg: 20px;
    --spacing-xl: 25px;
    --spacing-xxl: 30px;
    --spacing-xxxl: 40px;
    
    /* Border radius */
    --border-radius-sm: 3px;
    
    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease-out;
    
    /* Z-index */
    --z-dropdown: 1000;
}

/* Base styles */
body {
    margin: 0;
    padding: 0;
    min-height: 100vh;
    display: flex;
    justify-content: center;
}

.container {
    width: var(--container-width);
    max-width: var(--container-max-width);
    min-width: var(--container-min-width);
    padding: var(--container-padding);
    margin: var(--container-margin);
    position: relative;
}

/* Logo styling */
.logos {
    position: fixed;
    top: var(--spacing-sm);
    left: var(--spacing-sm);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
    z-index: var(--z-dropdown);
}

.logo-link {
    display: block;
}

.logo {
    height: 48px;
    width: auto;
}

.harvard-logo {
    height: 26.4px; /* 55% of 48px */
}

.mit-logo {
    height: 36px; /* 75% of 48px */
}

/* Title box styling */
.title-box {
    width: 100%;
    height: 30px;
    display: flex;
    margin-bottom: var(--spacing-lg);
}

.title-box-left,
.title-box-right {
    flex: 1;
    background-color: rgba(163, 31, 52, 0.05);
    margin: 0 2px;
    display: flex;
    align-items: center;
    justify-content: center;
    text-decoration: none;
    color: var(--text-color);
    font-weight: bold;
    transition: background-color 0.3s ease;
}

.title-box-left:hover,
.title-box-right:hover {
    background-color: rgba(163, 31, 52, 0.15);
}

.title-box-left.active,
.title-box-right.active {
    border-top: 1px solid rgba(0, 0, 0, 0.6);
    border-bottom: 1px solid rgba(0, 0, 0, 0.6);
}

.title {
    text-align: center;
    font-size: var(--font-size-title);
    font-weight: bold;
    margin: 0 0 10px 0;
    padding-top: 80px;
}

/* Navigation */
.nav {
    text-align: center;
    margin: var(--spacing-lg) 0;
}

.nav a {
    text-decoration: none;
    margin: 0 var(--spacing-md);
    font-weight: bold;
}

/* Content areas */
.content {
    text-align: center;
}

.semester-info {
    margin-bottom: var(--spacing-xxl);
}

.semester-title {
    font-size: var(--font-size-semester-title);
    font-weight: bold;
    margin-bottom: 2px;
    padding-top: 15px;
}

.semester-description {
    margin: 0 auto 8px auto;
    max-width: 72%;
    text-align: justify;
    text-align-last: center;
    line-height: 1;
}

.organizer-info {
    margin-bottom: 12px;
    font-style: italic;
    font-size: var(--font-size-normal);
}

.meeting-info {
    margin: 0 auto 5px auto;
    max-width: 72%;
    text-align: justify;
    text-align-last: center;
}

.calendar-link {
    text-decoration: none;
    font-size: var(--font-size-normal);
    display: inline-block;
    width: 35%;
    line-height: 1;
}

/* Talk styles */
.talks-container {
    margin-bottom: var(--spacing-xxl);
    text-align: left;
}

.talk {
    margin-bottom: var(--spacing-xl);
    padding: var(--spacing-lg);
    border: 1px solid #dc3545;
    border-radius: 0;
    background-color: #fafafa;
    transition: all var(--transition-normal);
    position: relative;
    cursor: pointer;
}

.talk:hover {
    border-color: #c82333;
    box-shadow: 0 2px 8px rgba(220, 53, 69, 0.2);
}

.talk-header {
    padding: 0;
    margin: 0;
    transition: all var(--transition-fast);
    position: relative;
    height: auto;
    min-height: auto;
}

.talk-header:hover {
    transform: translateY(-1px);
}

.talk-date {
    font-size: var(--font-size-small);
    color: #666;
    font-weight: 500;
    margin-bottom: var(--spacing-xs);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.talk-title {
    font-size: var(--font-size-talk-title);
    font-weight: 600;
    margin: var(--spacing-sm) 0;
    line-height: 1.3;
    color: #000000;
    position: relative;
    transition: all var(--transition-fast);
}

.talk-speaker {
    font-size: var(--font-size-talk-speaker);
    font-weight: 500;
    margin: var(--spacing-sm) 0 0 0;
    color: #666666;
    font-style: italic;
}

.talk-affiliation {
    color: #666666;
    font-weight: normal;
}

.talk-expand-indicator {
    position: absolute;
    left: -51px;
    top: 50%;
    transform: translateY(-50%);
    font-size: 20px;
    color: #bdc3c7;
    transition: transform var(--transition-fast);
    z-index: 10;
}

.talk-title:hover .talk-expand-indicator {
    /* Color change removed - keeping original color */
}

.talk-abstract {
    max-height: 0;
    overflow: hidden;
    transition: all var(--transition-normal);
    padding: 0;
    margin: 0;
    border-radius: var(--border-radius-sm);
    background-color: #ffffff;
    border: none;
    height: 0;
}

.talk-abstract.expanded {
    max-height: 1000px;
    height: auto;
    padding: var(--spacing-lg);
    margin-top: var(--spacing-md);
}

.talk-abstract-content {
    font-size: 14px;
    line-height: 1.1;
    color: #2c3e50;
    text-align: left;
    transition: opacity 0.1s ease;
    font-family: 'Courier New', monospace;
}

.talk-abstract-content::first-letter {
    font-size: 1.2em;
    font-weight: 600;
    color: #34495e;
}

/* Scrambled text effect */
.talk-abstract-content.scrambling {
    animation: glitch 0.1s infinite;
}

@keyframes glitch {
    0% { transform: translate(0); }
    20% { transform: translate(-1px, 1px); }
    40% { transform: translate(-1px, -1px); }
    60% { transform: translate(1px, 1px); }
    80% { transform: translate(1px, -1px); }
    100% { transform: translate(0); }
}

/* Past seminars page */
.past-semester {
    margin-bottom: var(--spacing-lg);
    padding: var(--spacing-md);
    border: 1px solid #ddd;
    text-align: left;
}

.past-semester h3 {
    margin-bottom: var(--spacing-xs);
    font-size: 18px;
}

.past-semester p {
    margin-bottom: var(--spacing-sm);
}

.past-semester a {
    text-decoration: none;
    font-weight: bold;
}

/* Loading and error states */
.loading {
    text-align: center;
    padding: var(--spacing-xxxl);
    font-style: italic;
}

.error {
    padding: var(--spacing-sm);
    border-radius: var(--border-radius-sm);
    margin: var(--spacing-lg) 0;
    text-align: center;
}

/* Responsive design */
@media (max-width: 768px) {
    .container {
        width: 90%;
        margin: var(--spacing-sm);
        padding: var(--spacing-md);
    }
    
    .nav a {
        display: block;
        margin-bottom: var(--spacing-xs);
    }
    
    .title {
        font-size: var(--font-size-title-mobile);
    }
    
    .semester-title {
        font-size: var(--font-size-semester-title-mobile);
    }
    
    .talk {
        padding: var(--spacing-md);
        margin-bottom: var(--spacing-lg);
    }
    
    .talk-title {
        font-size: var(--font-size-talk-title-mobile);
    }
    
    .talk-speaker {
        font-size: var(--font-size-talk-speaker-mobile);
    }
    
    .talk-expand-indicator {
        font-size: 16px;
    }
    
    .talk-abstract.expanded {
        padding: var(--spacing-md);
    }
    
    .logo {
        height: 36px;
    }
    
    .harvard-logo {
        height: 19.8px; /* 55% of 36px */
    }
    
    .mit-logo {
        height: 27px; /* 75% of 36px */
    }
    
    .logos {
        display: none;
    }
}