@import url('https://fonts.googleapis.com/css2?family=IBM+Plex+Serif:ital,wght@0,100;0,200;0,300;0,400;0,500;0,600;0,700;1,100;1,200;1,300;1,400;1,500;1,600;1,700&display=swap');
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&display=swap');

:root {
    --theme-color: #41b0fe;
    --theme-color-light: color-mix(in srgb, var(--theme-color) 80%, white);
    --theme-color-dark: color-mix(in srgb, var(--theme-color) 80%, black);
}

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

body {
    font-family: "Inter", system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, sans-serif;
    background-color: #fefcf7;
    color: #333;
    line-height: 1.6;
    position: relative;
    overflow-x: hidden;
}

html {
    scroll-padding-top: 50px;
}

h1, h2, h3, h4, h5, h6 {
    font-family: "IBM Plex Serif", serif;
    letter-spacing: -0.01em;
}

/* Scrolling Grid Background */
body::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    background-image: 
        linear-gradient(color-mix(in srgb, var(--theme-color) 10%, transparent) 1px, transparent 1px),
        linear-gradient(90deg, color-mix(in srgb, var(--theme-color) 10%, transparent) 1px, transparent 1px);
    background-size: 40px 40px;
    pointer-events: none;
}

/* Navigation Bar */
nav {
    background-color: #ffffff;
    box-shadow: 0 2px 10px color-mix(in srgb, var(--theme-color) 20%, transparent);
    position: sticky;
    top: 0;
    z-index: 100;
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 70px;
}

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--theme-color);
    text-decoration: none;
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 2rem;
}

.nav-links a {
    text-decoration: none;
    color: #333;
    font-weight: 500;
    transition: color 0.3s ease;
    padding: 0.5rem 1rem;
    border-radius: 8px;
}

.nav-links a:hover {
    color: var(--theme-color);
    background-color: #fefcf7;
}

/* Dropdown Menu */
.dropdown {
    position: relative;
    display: inline-block;
}

.dropdown-content {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    background-color: #ffffff;
    min-width: 200px;
    box-shadow: 0 8px 32px color-mix(in srgb, var(--theme-color) 20%, transparent);
    border: 1px solid color-mix(in srgb, var(--theme-color) 30%, transparent);
    border-radius: 12px;
    z-index: 1000;
    padding: 8px 0;
    margin-top: 4px;
}

.dropdown:hover .dropdown-content {
    display: block;
}

.dropdown-content a {
    color: #333 !important;
    padding: 12px 16px !important;
    text-decoration: none;
    display: block;
    transition: background-color 0.3s ease;
    border-radius: 8px !important;
    margin: 2px 8px;
    font-weight: 500;
}

.dropdown-content a:hover {
    background-color: color-mix(in srgb, var(--theme-color) 10%, transparent);
    color: var(--theme-color) !important;
}

.dropdown > a::after {
    content: ' ▼';
    font-size: 0.7rem;
    margin-left: 0.5rem;
    opacity: 0.7;
}

/* Mobile Nav */
.menu-toggle {
    display: none;
    background: none;
    border: 0;
    padding: 12px;
    border-radius: 8px;
    cursor: pointer;
    font-size: 1.5rem;
    color: #333;
    transition: background-color 0.3s ease;
}

.menu-toggle:hover {
    background-color: color-mix(in srgb, var(--theme-color) 10%, transparent);
}

.menu-toggle:focus-visible { box-shadow: 0 0 0 4px color-mix(in srgb, var(--theme-color) 25%, transparent); }

@media (max-width: 768px) {
    .menu-toggle { display: block; }
    .nav-links { display: none; position: absolute; top: 70px; right: 16px; left: 16px; flex-direction: column; gap: 0; background: #ffffff; border: 1px solid color-mix(in srgb, var(--theme-color) 30%, transparent); border-radius: 12px; padding: 8px; box-shadow: 0 12px 36px color-mix(in srgb, var(--theme-color) 20%, transparent); }
    .nav-links.open { display: flex; }
    .nav-links li a { padding: 12px 14px; border-radius: 8px; }
    
    /* Mobile dropdown adjustments */
    .dropdown-content {
        position: static;
        display: none;
        box-shadow: none;
        border: none;
        background-color: color-mix(in srgb, var(--theme-color) 5%, transparent);
        border-radius: 8px;
        margin: 4px 0;
    }
    
    .dropdown.open .dropdown-content {
        display: block;
    }
}

/* Main Content */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 40px 20px;
}

.hero {
    text-align: center;
    margin-bottom: 60px;
}

.hero h1 {
    font-size: 3.25rem;
    font-weight: 800;
    color: #0f172a;
    margin-bottom: 1rem;
}

.hero p {
    font-size: 1.125rem;
    color: #475569;
    max-width: 700px;
    margin: 0 auto;
}

/* Calendar Section */
.calendar-section {
    margin: 80px 0;
    padding: 40px 0;
    background: linear-gradient(180deg, rgba(241,245,249,0.25), rgba(255,255,255,0));
    border-radius: 24px;
}

.calendar-title {
    text-align: center;
    font-size: 2.25rem;
    font-weight: 800;
    color: #0f172a;
    margin-bottom: 2rem;
}

.calendar-container {
    max-width: 1000px;
    margin: 0 auto;
    padding: 0 20px;
}

.calendar-event {
    background: #ffffff;
    border-radius: 16px;
    padding: 2rem;
    margin-bottom: 1.5rem;
    box-shadow: 0 6px 18px color-mix(in srgb, var(--theme-color) 15%, transparent);
    border: 1px solid color-mix(in srgb, var(--theme-color) 30%, transparent);
    transition: transform 0.3s ease, box-shadow 0.3s ease, border-color 0.3s ease;
    display: grid;
    grid-template-columns: 140px 1fr;
    gap: 2rem;
    align-items: start;
}

.calendar-event:hover {
    transform: translateY(-4px);
    box-shadow: 0 12px 36px color-mix(in srgb, var(--theme-color) 25%, transparent);
    border-color: var(--theme-color);
}

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

.calendar-date {
    text-align: center;
    padding: 1rem;
    background: linear-gradient(135deg, var(--theme-color), var(--theme-color-light));
    color: white;
    border-radius: 12px;
    position: relative;
}

.calendar-date .month-year {
    font-size: 0.85rem;
    font-weight: 500;
    opacity: 0.9;
    margin-bottom: 0.25rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.calendar-date .day {
    font-size: 2rem;
    font-weight: 800;
    line-height: 1;
    font-family: "IBM Plex Serif", serif;
}

.calendar-content {
    padding-top: 0.25rem;
}

.calendar-content .title {
    font-size: 1.5rem;
    font-weight: 700;
    color: #0f172a;
    margin-bottom: 0.75rem;
    font-family: "IBM Plex Serif", serif;
}

.calendar-content .speaker {
    font-size: 1rem;
    font-weight: 600;
    color: var(--theme-color);
    margin-bottom: 1rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}


.calendar-content .abstract {
    color: #475569;
    font-size: 1rem;
    line-height: 1.6;
    max-width: none;
}

.calendar-content .abstract p {
    margin-bottom: 1rem;
}

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

@media (max-width: 768px) {
    .calendar-event {
        grid-template-columns: 1fr;
        gap: 1.5rem;
        padding: 1.5rem;
    }

    .calendar-date {
        justify-self: center;
        width: 120px;
    }

    .calendar-content .title {
        font-size: 1.3rem;
    }
}

/* Cards Section */
.cards-section {
    margin-top: 60px;
}

.lecture-cards {
    display: flex;
    flex-direction: row;
    align-items: stretch;
    justify-content: center;
    gap: 2rem;
    margin-bottom: 2rem;
    max-width: 1000px;
    margin-left: auto;
    margin-right: auto;
}

.lecture-cards .card {
    padding: 1.5rem;
    flex: 1;
    max-width: 450px;
    min-height: 200px;
    display: flex;
    flex-direction: column;
}

@media (max-width: 768px) {
    .lecture-cards {
        flex-direction: column;
        align-items: center;
    }

    .lecture-cards .card {
        max-width: 100%;
    }
}

.lecture-cards .card h3 {
    font-size: 1.35rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    line-height: 1.3;
}

.lecture-cards .card-meta {
    font-size: 0.85rem;
    color: #94a3b8;
    margin-bottom: 0.75rem;
    font-weight: 500;
}

.lecture-cards .card-speaker {
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--theme-color);
    margin-bottom: 1.25rem;
    display: flex;
    align-items: center;
    gap: 0.4rem;
}


.lecture-cards .card-icon {
    width: 36px;
    height: 36px;
    margin-bottom: 0.75rem;
    font-size: 1rem;
}

.lecture-cards .btn {
    padding: 0.7rem 1.4rem;
    font-size: 0.9rem;
    font-weight: 600;
    margin-top: auto;
    align-self: flex-start;
    width: auto;
}


.card {
    background: #ffffff;
    border-radius: 16px;
    padding: 2rem;
    box-shadow: 0 6px 18px color-mix(in srgb, var(--theme-color) 15%, transparent);
    border: 1px solid rgba(192, 200, 204, 0.3);
    transition: transform 0.3s ease, box-shadow 0.3s ease, border-color 0.3s ease;
    position: relative;
}

.card:hover {
    transform: translateY(-6px);
    box-shadow: 0 12px 36px color-mix(in srgb, var(--theme-color) 25%, transparent);
    border-color: var(--theme-color);
}

.card-icon {
    width: 56px;
    height: 56px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1.25rem;
    font-size: 1.4rem;
    box-shadow: inset 0 0 0 1px rgba(255,255,255,0.25);
}

.card-icon.next {
    background: linear-gradient(135deg, var(--theme-color), var(--theme-color-light));
    color: white;
}

.card-icon.previous {
    background: linear-gradient(135deg, var(--theme-color), var(--theme-color-light));
    color: white;
}

.card-icon.join {
    background: linear-gradient(135deg, #F5E6A3, #E8D078);
    color: #333;
}

.card h3 {
    font-size: 1.45rem;
    font-weight: 700;
    color: #111827;
    margin-bottom: 0.75rem;
}

.card p {
    color: #475569;
    margin-bottom: 1.25rem;
}

.card-meta {
    font-size: 0.9rem;
    color: #94a3b8;
    margin-bottom: 1rem;
}

.btn {
    display: inline-block;
    padding: 12px 24px;
    border-radius: 8px;
    text-decoration: none;
    font-weight: 600;
    transition: all 0.3s ease;
    border: none;
    cursor: pointer;
    font-size: 1rem;
    position: relative;
    outline: none;
}

.btn-primary {
    background: linear-gradient(135deg, var(--theme-color), var(--theme-color-light));
    color: white;
}

.btn-primary:hover {
    background: linear-gradient(135deg, var(--theme-color-light), var(--theme-color-dark));
    transform: translateY(-2px);
}

.btn-primary:active {
    transform: translateY(0);
    filter: brightness(0.95);
}

.btn-primary:focus-visible {
    box-shadow: 0 0 0 4px color-mix(in srgb, var(--theme-color) 25%, transparent);
}

.btn-secondary {
    background: #fefcf7;
    color: #475569;
    border: 1px solid color-mix(in srgb, var(--theme-color) 30%, transparent);
}

.btn-secondary:hover {
    background: #f7f4ed;
    border-color: var(--theme-color);
}

.btn-secondary:active {
    transform: translateY(0);
    filter: brightness(0.98);
}

.btn-secondary:focus-visible {
    box-shadow: 0 0 0 4px rgba(15, 23, 42, 0.15);
}

/* Proof Writing Workshop Section */
.proofwriting-section {
    margin: 80px 0;
    padding: 40px 0;
    background: linear-gradient(180deg, rgba(241,245,249,0.25), rgba(255,255,255,0));
    border-radius: 24px;
}

.proofwriting-title {
    text-align: center;
    font-size: 2.25rem;
    font-weight: 800;
    color: #0f172a;
    margin-bottom: 1rem;
    font-family: "IBM Plex Serif", serif;
}

.proofwriting-description {
    text-align: center;
    font-size: 1.125rem;
    color: #475569;
    max-width: 800px;
    margin: 0 auto 2rem;
    line-height: 1.6;
}

.proofwriting-container {
    max-width: 1000px;
    margin: 0 auto;
    padding: 0 20px;
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 2rem;
}

.workshop-card {
    background: #ffffff;
    border-radius: 16px;
    padding: 2rem;
    box-shadow: 0 6px 18px color-mix(in srgb, var(--theme-color) 15%, transparent);
    border: 1px solid color-mix(in srgb, var(--theme-color) 30%, transparent);
    transition: transform 0.3s ease, box-shadow 0.3s ease, border-color 0.3s ease;
    display: flex;
    flex-direction: column;
}

.workshop-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 12px 36px color-mix(in srgb, var(--theme-color) 25%, transparent);
    border-color: var(--theme-color);
}

.workshop-week {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--theme-color);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 0.5rem;
}

.workshop-title {
    font-size: 1.35rem;
    font-weight: 700;
    color: #0f172a;
    margin-bottom: 1rem;
    font-family: "IBM Plex Serif", serif;
}

.workshop-info {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    margin-bottom: 1.5rem;
    color: #475569;
    font-size: 0.95rem;
}

.workshop-info-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.workshop-info-item strong {
    color: #0f172a;
    font-weight: 600;
}

.workshop-card .btn {
    margin-top: auto;
    align-self: flex-start;
}

@media (max-width: 768px) {
    .proofwriting-container {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }
    
    .workshop-card {
        padding: 1.5rem;
    }
}

/* Leadership Section */
.leadership-section {
    margin: 80px 0;
    padding: 40px 0;
    background: linear-gradient(180deg, rgba(241,245,249,0.25), rgba(255,255,255,0));
    border-radius: 24px;
}

.leadership-title {
    text-align: center;
    font-size: 2.25rem;
    font-weight: 800;
    color: #0f172a;
    margin-bottom: 2rem;
    font-family: "IBM Plex Serif", serif;
}

.leadership-container {
    max-width: 1000px;
    margin: 0 auto;
    padding: 0 20px;
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 2rem;
}

.leader-card {
    background: #ffffff;
    border-radius: 16px;
    padding: 2rem;
    box-shadow: 0 6px 18px color-mix(in srgb, var(--theme-color) 15%, transparent);
    border: 1px solid color-mix(in srgb, var(--theme-color) 30%, transparent);
    transition: transform 0.3s ease, box-shadow 0.3s ease, border-color 0.3s ease;
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
}

.leader-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 12px 36px color-mix(in srgb, var(--theme-color) 25%, transparent);
    border-color: var(--theme-color);
}

.leader-image {
    width: 150px;
    height: 150px;
    border-radius: 50%;
    overflow: hidden;
    margin-bottom: 1.5rem;
    border: 3px solid var(--theme-color);
    box-shadow: 0 4px 12px color-mix(in srgb, var(--theme-color) 20%, transparent);
}

.leader-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.leader-image-empty {
    background: linear-gradient(135deg, #f1f5f9, #e2e8f0);
    border: 3px solid color-mix(in srgb, var(--theme-color) 30%, transparent);
}

.leader-info {
    width: 100%;
}

.leader-name {
    font-size: 1.35rem;
    font-weight: 700;
    color: #0f172a;
    margin-bottom: 0.5rem;
    font-family: "IBM Plex Serif", serif;
}

.leader-title {
    font-size: 1rem;
    font-weight: 600;
    color: var(--theme-color);
    margin-bottom: 1rem;
}

.leader-bio {
    font-size: 0.95rem;
    color: #475569;
    line-height: 1.6;
    margin: 0;
}

@media (max-width: 768px) {
    .leadership-container {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }
    
    .leader-card {
        padding: 1.5rem;
    }
    
    .leader-image {
        width: 120px;
        height: 120px;
    }
}

/* Contact Section */
.contact-section {
    margin: 80px 0;
    padding: 60px 0;
    background: linear-gradient(180deg, rgba(241,245,249,0.25), rgba(255,255,255,0));
    border-radius: 24px;
}

.contact-container {
    max-width: 800px;
    margin: 0 auto;
    padding: 0 20px;
    text-align: center;
}

.contact-title {
    font-size: 2.25rem;
    font-weight: 800;
    color: #0f172a;
    margin-bottom: 2rem;
    font-family: "IBM Plex Serif", serif;
}

.contact-content {
    background: #ffffff;
    border-radius: 16px;
    padding: 2rem;
    box-shadow: 0 6px 18px color-mix(in srgb, var(--theme-color) 15%, transparent);
    border: 1px solid color-mix(in srgb, var(--theme-color) 30%, transparent);
}

.contact-content p {
    font-size: 1.125rem;
    color: #475569;
    margin: 0;
    line-height: 1.6;
}

.contact-content a {
    color: var(--theme-color);
    text-decoration: none;
    font-weight: 600;
    transition: color 0.3s ease;
}

.contact-content a:hover {
    color: #7BC8F5;
    text-decoration: underline;
}

/* Instagram embed styling */
.instagram-embed {
    display: flex;
    justify-content: center;
    margin: 2rem 0;
}

.instagram-media {
    margin: 0 auto !important;
}

/* Responsive Design */
@media (max-width: 768px) {
    .nav-links {
        gap: 1rem;
    }

    .nav-links a {
        padding: 0.5rem;
    }

    .hero h1 {
        font-size: 2rem;
    }

    .cards-section {
        grid-template-columns: 1fr;
    }

    .container {
        padding: 20px 15px;
    }

    .contact-title {
        font-size: 1.75rem;
    }

    .contact-content {
        padding: 1.5rem;
    }

    .contact-content p {
        font-size: 1rem;
    }
}