:root {
    --bg-color: #12141c;
    --container-bg: #1a1d29;
    --border-color: #2a2f42;
    --text-main: #f0f2f5;
    --text-muted: #9fa6b2;
    --accent-color: #4f46e5;
    --accent-hover: #6366f1;
    --alert-color: #ef4444;
    --call-color: #10b981;
    --telemetry-color: #eab308;
    --row-even: #1f2333;
    --highlight-color: #f59e0b;
    --highlight-bg: rgba(245, 158, 11, 0.15);
    --alfa-bg: #0d0f15;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-main);
    line-height: 1.6;
    padding: 280px 1rem 2rem;
    display: flex;
    justify-content: center;
}

.wrapper {
    width: 100%;
    max-width: 1100px;
}

/* ===== TOPO FIXO ===== */
header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background-color: var(--container-bg);
    border-bottom: 1px solid var(--border-color);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.4);
    padding: 0.75rem 1.5rem 0;
}

.header-content {
    max-width: 1100px;
    margin: 0 auto;
    text-align: center;
}

header h1 {
    font-size: 1.5rem;
    font-weight: 700;
    letter-spacing: -0.025em;
    margin-bottom: 0.2rem;
    background: linear-gradient(135deg, #ffffff 0%, #a5b4fc 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

header p {
    color: var(--text-muted);
    font-size: 0.82rem;
    margin-bottom: 0.15rem;
}

header h2 {
    font-size: 0.85rem;
    color: var(--accent-hover);
    font-weight: 600;
    margin-bottom: 0.6rem;
}

/* ===== CAMPO DE BUSCA — 2 CAMPOS COM SETAS ===== */
.search-box {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.6rem;
    margin-top: 0.5rem;
    flex-wrap: wrap;
}

.search-box label {
    color: var(--text-muted);
    font-size: 0.68rem;
    text-align: center;
    max-width: 260px;
    line-height: 1.3;
}

.input-group {
    display: flex;
    align-items: stretch;
}

.input-group input {
    background-color: var(--bg-color);
    border: 1px solid var(--border-color);
    border-left: none;
    border-right: none;
    padding: 0.45rem 0.5rem;
    color: var(--text-main);
    font-size: 1.05rem;
    width: 65px;
    text-align: center;
    letter-spacing: 0.1em;
    font-weight: 600;
    transition: border-color 0.2s, box-shadow 0.2s;
}

.input-group input:focus {
    outline: none;
    border-color: var(--accent-color);
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.15);
    z-index: 1;
    position: relative;
}

.input-group input::placeholder {
    color: var(--text-muted);
    letter-spacing: normal;
    font-weight: 400;
    font-size: 0.78rem;
}

.nav-btn {
    background-color: var(--bg-color);
    border: 1px solid var(--border-color);
    color: var(--text-muted);
    width: 26px;
    font-size: 0.6rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background-color 0.15s, color 0.15s;
    padding: 0;
    user-select: none;
}

.nav-btn:first-child {
    border-radius: 8px 0 0 8px;
}

.nav-btn:last-child {
    border-radius: 0 8px 8px 0;
    border-left: none;
}

.nav-btn:first-child {
    border-right: none;
}

.nav-btn:hover {
    background-color: var(--accent-color);
    color: #ffffff;
}

.nav-btn:active {
    background-color: var(--accent-hover);
}

.search-result {
    margin-top: 0.4rem;
    font-size: 1.64rem;
    min-height: 1.2em;
    font-weight: 700;
    transition: color 0.2s;
}

/* ===== BLOCO ALFABETO FONÉTICO ===== */
.alfa-bar {
    max-width: 1100px;
    margin: 0.75rem auto 0;
    padding: 0.5rem 0 0.6rem;
    border-top: 1px solid var(--border-color);
    display: flex;
    flex-wrap: wrap;
    gap: 0.3rem;
    justify-content: center;
}

.alfa-item {
    display: inline-flex;
    align-items: center;
    gap: 0.3rem;
    padding: 0.2rem 0.55rem;
    border-radius: 6px;
    background-color: var(--alfa-bg);
    border: 1px solid var(--border-color);
    font-size: 0.72rem;
    line-height: 1.3;
    transition: border-color 0.2s, background-color 0.2s;
}

.alfa-item:hover {
    border-color: var(--accent-color);
    background-color: rgba(79, 70, 229, 0.1);
}

.alfa-item .alfa-letra {
    font-weight: 700;
    color: var(--accent-hover);
    font-size: 0.82rem;
}

.alfa-item .alfa-palavra {
    color: var(--text-muted);
}

.alfa-item.alfa-numero .alfa-letra {
    color: var(--call-color);
}

.alfa-sep {
    width: 1px;
    background-color: var(--border-color);
    margin: 0 0.2rem;
}

/* ===== TABELAS ===== */
.grid-tables {
    display: grid;
    grid-template-columns: 1fr;
    gap: 2rem;
    margin-top: 30px;
}

@media (min-width: 900px) {
    .grid-tables {
        grid-template-columns: 1fr 1fr;
    }
}

.table-container {
    background-color: var(--container-bg);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.25);
}

.table-container h2 {
    font-size: 1.1rem;
    padding: 1.25rem;
    background-color: rgba(255, 255, 255, 0.02);
    border-bottom: 1px solid var(--border-color);
    font-weight: 600;
}

table {
    width: 100%;
    border-collapse: collapse;
    text-align: left;
    font-size: 0.9rem;
}

th, td {
    padding: 0.85rem 1.25rem;
    border-bottom: 1px solid var(--border-color);
    vertical-align: top;
}

th {
    background-color: rgba(0, 0, 0, 0.15);
    color: var(--text-muted);
    font-weight: 500;
    text-transform: uppercase;
    font-size: 0.75rem;
    letter-spacing: 0.05em;
}

tr:nth-child(even) {
    background-color: var(--row-even);
}

tr:last-child td {
    border-bottom: none;
}

/* ===== TEXTO DE USO ABAIXO DA FREQ ===== */
.cell-uso {
    font-size: 0.72rem;
    margin-top: 0.25rem;
    line-height: 1.3;
    color: var(--text-muted);
}

.cell-uso .badge {
    font-size: 0.68rem;
    padding: 0.15rem 0.4rem;
}

.cell-uso.note {
    font-style: italic;
}

/* ===== HIGHLIGHT ===== */
tr.highlight {
    background-color: var(--highlight-bg) !important;
    animation: pulse 0.6s ease;
}

tr.highlight td {
    border-color: rgba(245, 158, 11, 0.3);
}

tr.highlight td:first-child {
    border-left: 3px solid var(--highlight-color);
}

td.cell-highlight {
    color: var(--highlight-color);
    font-weight: 700;
    font-size: 1rem;
}

@keyframes pulse {
    0% { background-color: rgba(245, 158, 11, 0.4); }
    100% { background-color: var(--highlight-bg); }
}

/* ===== BADGES ===== */
.badge {
    display: inline-block;
    padding: 0.2rem 0.5rem;
    border-radius: 6px;
    font-size: 0.75rem;
    font-weight: 600;
}

.badge-emergencia { background-color: rgba(239, 68, 68, 0.15); color: var(--alert-color); }
.badge-chamada { background-color: rgba(16, 185, 129, 0.15); color: var(--call-color); }
.badge-dados { background-color: rgba(234, 179, 8, 0.15); color: var(--telemetry-color); }

.note {
    font-size: 0.8rem;
    color: var(--text-muted);
    font-style: italic;
}

/* ===== FOOTER ===== */
footer {
    margin-top: 3rem;
    text-align: center;
    font-size: 0.85rem;
    color: var(--text-muted);
    border-top: 1px solid var(--border-color);
    padding-top: 1.5rem;
}

/* ===== SCROLL OFFSET ===== */
tr.highlight {
    scroll-margin-top: 280px;
}

/* ===== POPUP ALFABETO FONÉTICO ===== */
.alfa-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.85);
    z-index: 2000;
    justify-content: center;
    align-items: center;
    backdrop-filter: blur(4px);
}

.alfa-overlay.active {
    display: flex;
}

.alfa-popup {
    background-color: var(--container-bg);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 2rem;
    max-width: 900px;
    width: 92%;
    max-height: 88vh;
    overflow-y: auto;
    position: relative;
    box-shadow: 0 8px 40px rgba(0, 0, 0, 0.5);
    animation: popupFadeIn 0.3s ease;
}

@keyframes popupFadeIn {
    from { opacity: 0; transform: scale(0.95); }
    to { opacity: 1; transform: scale(1); }
}

.alfa-popup h3 {
    text-align: center;
    font-size: 1.4rem;
    margin-bottom: 1.5rem;
    background: linear-gradient(135deg, #ffffff 0%, #a5b4fc 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.alfa-popup-close {
    position: absolute;
    top: 0.75rem;
    right: 1rem;
    background: none;
    border: none;
    color: var(--text-muted);
    font-size: 2rem;
    cursor: pointer;
    line-height: 1;
    transition: color 0.2s;
}

.alfa-popup-close:hover {
    color: var(--alert-color);
}

.alfa-popup-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
    gap: 0.8rem;
}

.alfa-popup-card {
    background-color: var(--alfa-bg);
    border: 1px solid var(--border-color);
    border-radius: 10px;
    padding: 0.8rem;
    text-align: center;
    transition: border-color 0.2s, transform 0.15s;
}

.alfa-popup-card:hover {
    border-color: var(--accent-color);
    transform: translateY(-2px);
}

.alfa-popup-card .apc-letra {
    font-size: 2rem;
    font-weight: 800;
    color: var(--accent-hover);
    line-height: 1;
    margin-bottom: 0.3rem;
}

.alfa-popup-card .apc-palavra {
    font-size: 1.05rem;
    color: var(--text-main);
    font-weight: 600;
    margin-bottom: 0.4rem;
}

.alfa-popup-card .apc-morse {
    font-size: 0.95rem;
    color: var(--telemetry-color);
    font-family: "Courier New", monospace;
    letter-spacing: 0.15em;
    font-weight: 600;
    padding-top: 0.4rem;
    border-top: 1px solid var(--border-color);
}

.alfa-popup-card.alfa-popup-num .apc-letra {
    color: var(--call-color);
}

/* ===== AJUSTE BARRA ALFA - CURSOR POINTER ===== */
.alfa-item {
    cursor: pointer;
}

/* ===== RESPONSIVO ===== */
@media (max-width: 600px) {
    .alfa-popup-grid {
        grid-template-columns: repeat(auto-fill, minmax(110px, 1fr));
    }

    .alfa-popup-card .apc-letra {
        font-size: 1.6rem;
    }

    .alfa-popup-card .apc-palavra {
        font-size: 0.9rem;
    }

    .alfa-popup-card .apc-morse {
        font-size: 0.8rem;
    }

    .alfa-popup {
        padding: 1.2rem;
    }
}