/* Variables CSS */
:root {
    --bg: #0f172a;
    --panel: #1e293b;
    --accent: #38bdf8;
    --accent-alt: #a78bfa;
    --text: #f1f5f9;
    --muted: #94a3b8;
}

/* Base styles */
body {
    margin: 0;
    font-family: system-ui, Arial, sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.45;
}

/* Header */
header {
    padding: 2.5rem 1.25rem 1rem;
    text-align: center;
}

h1 {
    margin: 0 0 .75rem;
    font-size: 2.1rem;
    background: linear-gradient(90deg, var(--accent), var(--accent-alt));
    -webkit-background-clip: text;
    color: transparent;
}

p.lead {
    max-width: 760px;
    margin: .5rem auto 1.5rem;
    font-size: 1.05rem;
    color: var(--muted);
}

/* Main content */
main {
    max-width: 1040px;
    margin: 0 auto;
    padding: 0 1.25rem 3rem;
}

section {
    margin-top: 2.5rem;
}

h2 {
    font-size: 1.3rem;
    margin: 0 0 .75rem;
    letter-spacing: .5px;
}

/* Lists */
ul.clean {
    list-style: none;
    margin: 0;
    padding: 0;
    display: grid;
    gap: .75rem;
}

ul.clean li {
    background: var(--panel);
    padding: .9rem 1rem;
    border-radius: 10px;
    border: 1px solid #334155;
    position: relative;
    overflow: hidden;
}

ul.clean li:before {
    content: "";
    position: absolute;
    inset: 0;
    background: linear-gradient(120deg, transparent 0%, rgba(255, 255, 255, 0.04) 40%, transparent 70%);
    pointer-events: none;
}

/* Tags and buttons */
.tag {
    display: inline-block;
    background: #334155;
    color: var(--muted);
    font-size: .66rem;
    letter-spacing: 1px;
    padding: .25rem .5rem;
    border-radius: 20px;
    text-transform: uppercase;
    margin-bottom: .4rem;
}

a.btn {
    display: inline-block;
    background: var(--accent);
    color: #082f49;
    text-decoration: none;
    font-weight: 600;
    padding: .75rem 1.1rem;
    border-radius: 8px;
    box-shadow: 0 4px 12px -2px rgba(56, 189, 248, .35);
    transition: .25s;
}

a.btn:hover {
    background: var(--accent-alt);
    color: #1e1e2e;
}

/* Grid layouts */
.grid-portal {
    display: grid;
    gap: 1rem;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
}

/* Portal cards with hover effects */
.portal-card {
    position: relative;
    overflow: hidden;
}

.portal-card::before {
    content: "";
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, rgba(56, 189, 248, 0.05) 0%, rgba(167, 139, 250, 0.05) 100%);
    opacity: 0;
    transition: opacity 0.3s ease;
    pointer-events: none;
}

.portal-card:hover {
    transform: translateY(-4px);
    border-color: var(--accent) !important;
    box-shadow: 0 8px 24px -4px rgba(56, 189, 248, 0.3);
}

.portal-card:hover::before {
    opacity: 1;
}

.portal-card:hover .portal-flag {
    transform: scale(1.2) rotate(5deg);
}

/* Grid específico para objetivos (flexible para 10 elementos) */
.objectives-grid {
    display: grid;
    gap: 1.2rem;
    grid-template-columns: repeat(5, 1fr);
}

@media (max-width: 1200px) {
    .objectives-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

@media (max-width: 768px) {
    .objectives-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 480px) {
    .objectives-grid {
        grid-template-columns: 1fr;
    }
}

/* Footer */
footer {
    text-align: center;
    padding: 2rem 1rem;
    color: var(--muted);
    font-size: .75rem;
}

/* Inline elements */
.inline-links a {
    color: var(--accent);
    text-decoration: none;
}

.inline-links a:hover {
    text-decoration: underline;
}

code {
    background: #0f2539;
    padding: .15rem .4rem;
    border-radius: 4px;
    font-size: .75rem;
}

.meta {
    font-size: .7rem;
    opacity: .75;
    margin-top: 2rem;
}

img.responsive {
    max-width: 100%;
    height: auto;
}

/* Media queries - Tablet */
@media (max-width: 900px) {
    h1 {
        font-size: 1.9rem;
    }

    p.lead {
        font-size: .98rem;
    }

    section {
        margin-top: 2rem;
    }
}

/* Media queries - Mobile */
@media (max-width: 640px) {
    header {
        padding: 1.75rem 1rem .5rem;
    }

    h1 {
        font-size: 1.65rem;
    }

    p.lead {
        margin: .5rem auto 1.1rem;
    }

    .grid-portal {
        grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    }

    ul.clean li {
        padding: .75rem .85rem;
    }
}

/* Media queries - Small mobile */
@media (max-width: 480px) {
    h1 {
        font-size: 1.45rem;
    }

    h2 {
        font-size: 1.15rem;
    }

    a.btn {
        padding: .6rem .9rem;
        font-size: .85rem;
    }

    header {
        padding: 1.4rem .85rem .4rem;
    }

    .meta {
        font-size: .62rem;
    }
}

/* Accessibility */
@media (prefers-reduced-motion: reduce) {
    a.btn {
        transition: none;
    }
}