/* ===== CSS Variables & Theme ===== */
:root {
    --bg: #1a1a1a;
    --bg-secondary: #2a2a2a;
    --text: #f0f0f0;
    --accent: #f74c00;          /* Rust orange */
    --accent-hover: #ff6a00;
    --border: #333;
    --mono: 'Courier New', monospace;
}

/* ===== Reset & Base ===== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}
html {
    scroll-behavior: smooth;
}
body {
    font-family: system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
    background-color: var(--bg);
    color: var(--text);
    line-height: 1.6;
    min-height: 100vh;
}
a {
    color: var(--accent);
    text-decoration: none;
    transition: color 0.2s;
}
a:hover {
    text-decoration: underline;
}
img {
    max-width: 100%;
    display: block;
}

/* ===== Subtle Circuit Board Pattern ===== */
body::before {
    content: "";
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image:
        linear-gradient(rgba(255,255,255,0.02) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255,255,255,0.02) 1px, transparent 1px);
    background-size: 24px 24px;
    pointer-events: none;
    z-index: -1;
}

/* ===== Header ===== */
header {
    position: sticky;
    top: 0;
    background-color: rgba(26,26,26,0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border);
    z-index: 100;
}
.header-container {
    max-width: 1000px;
    margin: 0 auto;
    padding: 1rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}
.logo {
    font-family: var(--mono);
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--accent);
    display: flex;
    align-items: center;
    gap: 0.3rem;
}
.logo span {
    color: var(--text);
}
nav ul {
    list-style: none;
    display: flex;
    gap: 1.5rem;
}
nav a {
    color: var(--text);
    font-weight: 500;
    font-size: 1rem;
}
nav a:hover {
    color: var(--accent);
}
.menu-toggle {
    display: none;
    background: none;
    border: none;
    color: var(--text);
    font-size: 1.8rem;
    cursor: pointer;
    line-height: 1;
}

/* ===== Hero Section with Banner Image ===== */
.hero {
    position: relative;
    overflow: hidden;
    background-color: #111; /* fallback */
}
.hero-bg {
    position: absolute;
    inset: 0;
    background-size: cover;
    background-position: center;
    opacity: 0.35;
}
.hero-overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(
        to bottom,
        rgba(0,0,0,0.6),
        rgba(0,0,0,0.8)
    );
}
.hero-content {
    position: relative;
    z-index: 1;
    max-width: 1000px;
    margin: 0 auto;
    padding: 5rem 1rem;
    text-align: center;
}
.hero h1 {
    font-family: var(--mono);
    font-size: 3.5rem;
    margin-bottom: 0.5rem;
    color: var(--accent);
    text-shadow: 2px 2px 4px rgba(0,0,0,0.5);
}
.hero p {
    font-size: 1.2rem;
    margin-bottom: 1rem;
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
}
.hero .btn-group {
    margin-top: 2rem;
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
}
.btn {
    display: inline-block;
    padding: 0.5rem 1rem;          /* Reduced padding for smaller buttons */
    border-radius: 6px;
    font-weight: bold;
    transition: all 0.3s;
    cursor: pointer;
    text-decoration: none;
    font-size: 0.9rem;             /* Slightly smaller font */
}
.btn-primary {
    background-color: var(--accent);
    color: #fff;
    border: 2px solid var(--accent);
}
.btn-primary:hover {
    background-color: var(--accent-hover);
    border-color: var(--accent-hover);
    text-decoration: none;
}
.btn-secondary {
    background: transparent;
    border: 2px solid var(--accent);
    color: var(--accent);
}
.btn-secondary:hover {
    background: var(--accent);
    color: #fff;
    text-decoration: none;
}
.btn-sm {
    padding: 0.3rem 0.6rem;
    font-size: 0.8rem;
}

/* ===== Section Styling ===== */
section {
    padding: 4rem 0;
}
.container {
    max-width: 1000px;
    margin: 0 auto;
    padding: 0 1rem;
}
h2 {
    font-family: var(--mono);
    font-size: 2.2rem;
    margin-bottom: 1.5rem;
    color: var(--accent);
    text-align: center;
    letter-spacing: -0.5px;
}

/* ===== About Section ===== */
.about-text {
    max-width: 750px;
    margin: 0 auto;
    text-align: center;
    font-size: 1.15rem;
    line-height: 1.8;
}

/* ===== Upcoming Meetup ===== */
.upcoming-card {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 2.5rem;
    text-align: center;
    max-width: 600px;
    margin: 0 auto;
    box-shadow: 0 4px 15px rgba(0,0,0,0.3);
}
.upcoming-card .date {
    font-family: var(--mono);
    font-size: 1.6rem;
    color: var(--accent);
    font-weight: bold;
    margin-bottom: 1.5rem;
}
.upcoming-card .topic {
    margin-bottom: 2rem;           /* Increased space before buttons */
}
.upcoming-card .topic h3 {
    font-size: 1.5rem;
    margin-bottom: 0.75rem;
}
.upcoming-card .topic p {
    margin-bottom: 0.3rem;
    opacity: 0.9;
}
.upcoming-card .topic strong {
    color: var(--accent);
}

/* ===== Calendar Buttons ===== */
.calendar-buttons {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 0.5rem;
    margin-top: 1rem;
}
.calendar-buttons .btn {
    margin: 0;                    /* remove any extra margin */
}
/* Force the first button (RSVP) to take full width, pushing the next two onto a new row */
.calendar-buttons .btn:first-child {
    flex-basis: 100%;
    margin-bottom: 0.25rem;       /* optional tiny space below RSVP */
}
/* Both calendar buttons use the secondary (theme) style */
.btn-calendar,
.btn-ics {
    background: transparent;
    border: 2px solid var(--accent);
    color: var(--accent);
}
.btn-calendar:hover,
.btn-ics:hover {
    background: var(--accent);
    color: #fff;
    text-decoration: none;
}

/* ===== Past Talks ===== */
.talks-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
}
.talk-card {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 1.5rem;
    text-align: center;            /* Center all text inside talk cards */
    transition: transform 0.2s, border-color 0.2s;
}
.talk-card:hover {
    transform: translateY(-3px);
    border-color: var(--accent);
}
.talk-card h3 {
    color: var(--accent);
    margin-bottom: 0.5rem;
    font-size: 1.2rem;
}
.talk-card p {
    font-size: 0.9rem;
    opacity: 0.8;
    margin-bottom: 0.8rem;
}
.talk-card .btn {
    margin-top: 0.5rem;            /* Space above YouTube button */
}

/* ===== Community / Contact ===== */
.community-links {
    display: flex;
    justify-content: center;
    gap: 2.5rem;
    flex-wrap: wrap;
}
.community-link {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.6rem;
    font-size: 1.2rem;
    color: var(--text);
}
.community-link .icon {
    width: 70px;
    height: 70px;
    border-radius: 50%;
    background-color: var(--accent);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    color: #fff;
    transition: background-color 0.3s, transform 0.2s;
}
.community-link:hover .icon {
    background-color: var(--accent-hover);
    transform: scale(1.1);
}
.community-link:hover {
    text-decoration: none;
}

/* ===== Footer ===== */
footer {
    background-color: var(--bg-secondary);
    border-top: 1px solid var(--border);
    padding: 2rem 0;
    text-align: center;
    font-size: 0.9rem;
    opacity: 0.8;
}
footer .container p {
    margin: 0.3rem 0;
}

/* ===== Responsive ===== */
@media (max-width: 768px) {
    .header-container {
        flex-wrap: wrap;
    }
    .menu-toggle {
        display: block;
    }
    nav {
        width: 100%;
    }
    nav ul {
        display: none;
        flex-direction: column;
        gap: 0;
        padding: 1rem 0;
        background-color: var(--bg);
        border-top: 1px solid var(--border);
        margin-top: 1rem;
    }
    nav ul.active {
        display: flex;
    }
    nav li {
        text-align: center;
        padding: 0.7rem 0;
    }
    .hero h1 {
        font-size: 2.2rem;
    }
    .hero p {
        font-size: 1rem;
    }
    .hero-content {
        padding: 3rem 1rem;
    }
    h2 {
        font-size: 1.8rem;
    }
    .community-links {
        gap: 1.5rem;
    }
    .community-link .icon {
        width: 60px;
        height: 60px;
        font-size: 1.5rem;
    }
}