:root {
    --bg-base: #0a0a0c;
    --bg-surface: #141417;
    --bg-surface-hover: #1c1c21;
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --accent-blue: #7dd3fc;
    --accent-blue-hover: #38bdf8;
    --border-color: #27272a;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--bg-base);
    color: var(--text-secondary);
    line-height: 1.7;
    -webkit-font-smoothing: antialiased;
}

.container {
    width: 90%;
    max-width: 900px;
    margin: 0 auto;
    padding: 0 15px;
}

h1, h2, h3 {
    color: var(--text-primary);
    line-height: 1.3;
}

h2 {
    text-align: center;
    font-size: 2rem;
    margin-bottom: 3rem;
    font-weight: 800;
    letter-spacing: -0.02em;
}

section {
    padding: 6rem 0;
}

/* Botoes */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.875rem 1.5rem;
    border-radius: 8px;
    font-weight: 600;
    text-decoration: none;
    transition: var(--transition);
    min-height: 48px; /* Touch target size */
    font-size: 1rem;
    cursor: pointer;
    border: none;
}

.btn-primary {
    background-color: var(--accent-blue);
    color: #000;
}

.btn-primary:hover {
    background-color: var(--accent-blue-hover);
    transform: translateY(-2px);
    box-shadow: 0 4px 20px rgba(125, 211, 252, 0.3);
}

.btn-secondary {
    background-color: transparent;
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

.btn-secondary:hover {
    background-color: var(--bg-surface-hover);
    border-color: var(--text-secondary);
}

/* Cards */
.card {
    background-color: var(--bg-surface);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 2.5rem;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.4);
}

.card p {
    margin-bottom: 1.5rem;
}

.card p:last-child {
    margin-bottom: 0;
}

.text-center {
    text-align: center;
}

/* Hero Section */
.hero {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    padding: 4rem 0;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(125, 211, 252, 0.05) 0%, transparent 60%);
    z-index: -1;
}

.hero-logo {
    max-width: 280px;
    width: 100%;
    height: auto;
    margin-bottom: 2.5rem;
    filter: drop-shadow(0 0 20px rgba(255,255,255,0.1));
}

.hero h1 {
    font-size: clamp(1.5rem, 4vw, 2.5rem);
    margin-bottom: 1.5rem;
    max-width: 800px;
}

.hero-info {
    margin-bottom: 3rem;
    font-size: 1.125rem;
}

.hero-info .date {
    color: var(--accent-blue);
    font-weight: 600;
}

/* Timeline Programacao */
.timeline {
    position: relative;
    max-width: 800px;
    margin: 0 auto;
}

.timeline-day {
    margin-bottom: 4rem;
}

.timeline-day h3 {
    font-size: 1.5rem;
    margin-bottom: 2rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid var(--border-color);
    color: var(--accent-blue);
}

.schedule-list {
    list-style: none;
    position: relative;
    padding-left: 2rem;
}

.schedule-list::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    height: 100%;
    width: 2px;
    background-color: var(--border-color);
}

.schedule-list li {
    position: relative;
    margin-bottom: 2rem;
    display: flex;
    flex-direction: column;
}

.schedule-list li::before {
    content: '';
    position: absolute;
    left: -2.35rem;
    top: 0.4rem;
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background-color: var(--bg-surface);
    border: 2px solid var(--accent-blue);
    transition: var(--transition);
}

.schedule-list li:hover::before {
    background-color: var(--accent-blue);
    box-shadow: 0 0 10px var(--accent-blue);
}

.time {
    font-weight: 600;
    color: var(--text-primary);
    font-size: 1.1rem;
    margin-bottom: 0.25rem;
}

.event {
    color: var(--text-secondary);
}

/* Comite Cientifico */
.comite-list {
    list-style: none;
    margin-bottom: 2rem;
}

.comite-list li {
    padding: 1rem 0;
    border-bottom: 1px solid var(--border-color);
    color: var(--text-primary);
    font-weight: 600;
}

.comite-list li:last-child {
    border-bottom: none;
}

.organizacao {
    font-size: 0.875rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-secondary);
}

/* Submissoes */
.submissoes-card {
    text-align: center;
    border: 1px solid var(--accent-blue);
    position: relative;
    overflow: hidden;
}

.highlight-info {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    margin-bottom: 2rem;
    background-color: rgba(125, 211, 252, 0.05);
    padding: 1.5rem;
    border-radius: 8px;
}

.highlight-info p {
    margin: 0;
    font-size: 1.125rem;
    color: var(--text-primary);
}

.highlight-info strong {
    color: var(--accent-blue);
}

.instrucao {
    font-size: 1rem;
    margin-bottom: 2.5rem !important;
}

.action-buttons {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
}

/* Footer */
footer {
    text-align: center;
    padding: 3rem 0;
    border-top: 1px solid var(--border-color);
    font-size: 0.875rem;
}

/* Animacoes de Scroll (JS) */
.section-reveal {
    opacity: 0;
    transform: translateY(40px);
    transition: opacity 0.8s cubic-bezier(0.5, 0, 0, 1), transform 0.8s cubic-bezier(0.5, 0, 0, 1);
}

.section-reveal.active {
    opacity: 1;
    transform: translateY(0);
}

/* Media Queries (Mobile First ja aplicado, ajustes para Desktop) */
@media (min-width: 768px) {
    .schedule-list li {
        flex-direction: row;
        align-items: baseline;
    }
    
    .time {
        min-width: 80px;
        margin-bottom: 0;
        margin-right: 1.5rem;
    }
    
    .highlight-info {
        flex-direction: row;
        justify-content: space-around;
    }
}