@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;900&display=swap');

:root {

    /* Modern neutral + accent palette */
    --bg: #f8fafc;
    --surface: rgba(255,255,255,0.7);
    --surface-solid: #ffffff;

    --primary: #0f172a;
    --secondary: #334155;

    --accent: #3b82f6;
    --accent-soft: #60a5fa;

    --border: rgba(0,0,0,0.06);

    --shadow-sm: 0 4px 12px rgba(0,0,0,0.04);
    --shadow-md: 0 8px 24px rgba(0,0,0,0.06);
    --shadow-lg: 0 20px 50px rgba(0,0,0,0.08);

    --radius-sm: 10px;
    --radius-md: 16px;
    --radius-lg: 22px;

}

/* RESET */

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

body {

    font-family: "Inter", sans-serif;
    background: linear-gradient(to bottom, #ffffff, var(--bg));
    color: var(--primary);

    -webkit-font-smoothing: antialiased;
}

/* HEADER */

header {

    background:
        linear-gradient(120deg, rgba(15,23,42,0.95), rgba(30,41,59,0.92));

    color: white;

    padding: 80px 20px 60px 20px;

    text-align: center;

}

header h1 {

    font-size: clamp(2.2rem, 4vw, 3.2rem);

    font-weight: 800;

    letter-spacing: -0.02em;

    margin-bottom: 12px;
}

header p {

    font-size: 1.1rem;

    opacity: 0.85;

}

/* NAVBAR */

nav {

    position: sticky;

    top: 0;

    z-index: 1000;

    backdrop-filter: blur(12px);

    background: rgba(255,255,255,0.75);

    border-bottom: 1px solid var(--border);

    padding: 14px;

    text-align: center;

}

nav a {

    color: var(--secondary);

    margin: 0 16px;

    text-decoration: none;

    font-weight: 500;

    padding: 8px 14px;

    border-radius: var(--radius-sm);

    transition: all 0.25s ease;

}

nav a:hover {

    background: rgba(59,130,246,0.08);

    color: var(--accent);

}

/* HERO */

.hero {

    padding: 110px 20px 90px 20px;

    text-align: center;

    max-width: 900px;

    margin: auto;

}

.hero h1 {

    font-size: clamp(2rem, 4vw, 3rem);

    font-weight: 800;

    letter-spacing: -0.02em;

    margin-bottom: 20px;

}

.hero p {

    font-size: 1.2rem;

    color: var(--secondary);

    margin-bottom: 35px;

}

/* BUTTON */

.btn {

    display: inline-block;

    padding: 14px 28px;

    border-radius: 999px;

    background: linear-gradient(
        135deg,
        var(--accent),
        var(--accent-soft)
    );

    color: white;

    text-decoration: none;

    font-weight: 600;

    transition: all 0.25s ease;

    box-shadow: var(--shadow-sm);

}

.btn:hover {

    transform: translateY(-2px);

    box-shadow: var(--shadow-md);

}

/* CONTAINER */

.container {

    max-width: 1100px;

    margin: auto;

    padding: 60px 20px;

}

/* SPEAKER CARDS */

.speaker-grid {

    display: grid;

    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));

    gap: 26px;

}

.speaker {

    background: var(--surface-solid);

    padding: 28px;

    border-radius: var(--radius-md);

    border: 1px solid var(--border);

    box-shadow: var(--shadow-sm);

    transition: all 0.25s ease;

}

.speaker:hover {

    transform: translateY(-6px);

    box-shadow: var(--shadow-lg);

}

.speaker img {

    width: 90px;

    height: 90px;

    border-radius: 50%;

    margin-bottom: 14px;

}

/* TABLE */

table {

    width: 100%;

    border-collapse: collapse;

    background: var(--surface-solid);

    border-radius: var(--radius-md);

    overflow: hidden;

    box-shadow: var(--shadow-sm);

}

th {

    text-align: left;

    padding: 16px;

    font-weight: 600;

    background: rgba(59,130,246,0.08);

}

td {

    padding: 16px;

    border-top: 1px solid var(--border);

}

tr:hover {

    background: rgba(59,130,246,0.04);

}

/* FORM */

form {

    background: var(--surface-solid);

    padding: 32px;

    border-radius: var(--radius-md);

    border: 1px solid var(--border);

    box-shadow: var(--shadow-sm);

}

input,
textarea {

    width: 100%;

    padding: 12px 14px;

    border-radius: var(--radius-sm);

    border: 1px solid var(--border);

    margin-bottom: 18px;

    font-family: inherit;

    transition: all 0.2s ease;

}

input:focus,
textarea:focus {

    outline: none;

    border-color: var(--accent);

    box-shadow: 0 0 0 3px rgba(59,130,246,0.1);

}

/* FOOTER */

footer {

    margin-top: 80px;

    padding: 30px;

    text-align: center;

    color: var(--secondary);

    border-top: 1px solid var(--border);

}

/* RESPONSIVE */

@media (max-width: 768px) {

    .hero {

        padding: 70px 20px;

    }

}