:root {
    --bg: #f0f2f5;
    --surface: #ffffff;
    --text: #212529;
    --text-secondary: #6c757d;
    --border: #dee2e6;
    --shadow: 0 2px 8px rgba(0,0,0,0.07);
    --primary: #2563eb;
    --secondary: #003366;
    --accent: #ffc107;
    --cor-sucesso: #28a745;
    --cor-erro: #dc3545;
    --accent-light: #fff3cd;
    --radius: 12px;
    --radius-sm: 8px;
    --font: 'Segoe UI', system-ui, -apple-system, sans-serif;
    --transition: 0.3s ease;
}

body.dark-theme {
    --bg: #0a1929;
    --surface: #112233;
    --text: #e9ecef;
    --text-secondary: #8696a7;
    --border: #334b61;
    --shadow: 0 1px 3px rgba(0,0,0,0.4);
    --primary: #3b82f6;
}

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

body {
    font-family: var(--font);
    background-color: var(--bg);
    color: var(--text);
    line-height: 1.6;
    transition: background-color var(--transition), color var(--transition);
    overflow-x: hidden;
    overflow-y: auto;
    min-height: 100dvh;
    width: 100%;
    max-width: 100%;
}

.app-container { display: flex; flex-direction: column; min-height: 100vh; width: 100%; max-width: 100%; overflow-x: hidden; }

/* ─── HEADER ─── */
.app-header {
    background: linear-gradient(145deg, #0f172a 0%, #1e3a5f 50%, #1a365d 100%);
    color: white;
    padding: 0.9rem 1rem;
    box-shadow: 0 2px 8px rgba(0,0,0,0.12);
    z-index: 1000;
    position: sticky;
    top: 0;
}

/* Botão Menu Hambúrguer (100% CSS Puro) */
.menu-hamburguer {
    display: inline-flex;
    flex-direction: column;
    justify-content: space-between;
    width: 20px;
    height: 15px;
    background: transparent;
    border: none;
    cursor: pointer;
    padding: 0;
    box-sizing: border-box;
    vertical-align: middle;
}

.menu-hamburguer span {
    display: block;
    width: 100%;
    height: 2px;
    background-color: #ffffff;
    border-radius: 2px;
    transition: opacity 0.2s ease, transform 0.2s ease;
}

.menu-hamburguer:hover span { opacity: 0.8; }
.menu-hamburguer:active span { transform: scale(0.92); }

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    max-width: 1600px;
    margin: 0 auto;
}

.header-content h1 {
    font-size: 1rem;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin: 0;
    color: white;
}

.theme-switcher { display: flex; align-items: center; gap: .5rem; }

.switch { position: relative; display: inline-block; width: 50px; height: 26px; }
.switch input { opacity: 0; width: 0; height: 0; }
.slider { position: absolute; cursor: pointer; top: 0; left: 0; right: 0; bottom: 0; background-color: rgba(255,255,255,0.25); transition: .4s; border-radius: 26px; }
.slider:before { position: absolute; content: ""; height: 20px; width: 20px; left: 3px; bottom: 3px; background-color: white; transition: .4s; border-radius: 50%; }
input:checked + .slider { background-color: var(--accent); }
input:checked + .slider:before { transform: translateX(24px); }

/* ─── FULLSCREEN MENU ─── */
.fullscreen-menu {
    position: fixed; top: 0; left: 0; width: 100%; height: 100%;
    background-color: var(--surface); z-index: 9999;
    display: flex; flex-direction: column; justify-content: center; align-items: center;
    opacity: 0; pointer-events: none; transition: all var(--transition);
    transform: translateY(-10px); overflow-x: hidden;
}
.fullscreen-menu.active { opacity: 1; pointer-events: auto; transform: translateY(0); }
.fullscreen-menu .close-btn { position: absolute; top: 1.5rem; right: 1.5rem; font-size: 2.5rem; color: var(--text); background: none; border: none; cursor: pointer; z-index: 1; }
.overlay-nav { display: flex; flex-direction: column; gap: 0.75rem; text-align: left; width: 92%; max-width: 480px; max-height: 80vh; overflow-y: auto; overflow-x: hidden; padding: 1rem 0; }
.overlay-nav h3 {
    color: var(--text-secondary); font-size: 0.7rem; text-transform: uppercase; letter-spacing: 0.1em;
    padding: 0.75rem 0.85rem 0.25rem; margin-top: 0.5rem; border-top: 1px solid var(--border); font-weight: 700;
}
.overlay-nav .nav-link, .overlay-nav a[data-nav], .overlay-nav a[data-table] {
    font-size: 0.95rem; font-weight: bold; color: var(--text); text-decoration: none;
    padding: 0.7rem 0.85rem; border-radius: var(--radius-sm); transition: all 0.2s ease;
    display: flex; align-items: center; justify-content: flex-start; gap: 0.75rem;
    border: 2px solid var(--border); background-color: var(--bg); box-sizing: border-box; width: 100%; word-break: break-word; overflow-wrap: break-word; white-space: normal;
}
.overlay-nav a[data-nav] i, .overlay-nav a[data-table] i { flex-shrink: 0; width: 1.2rem; text-align: center; }
.overlay-nav a[data-nav]:hover, .overlay-nav a[data-nav].active,
.overlay-nav a[data-table]:hover, .overlay-nav a[data-table].active {
    background-color: var(--primary); color: white; border-color: var(--primary);
}

@media (max-width: 480px) {
    .overlay-nav { width: 94%; gap: 0.6rem; }
    .overlay-nav a[data-nav], .overlay-nav a[data-table] { font-size: 0.88rem; padding: 0.6rem 0.7rem; gap: 0.6rem; }
    .fullscreen-menu .close-btn { top: 1rem; right: 1rem; font-size: 2rem; }
}

/* ─── LAYOUT ─── */
.app-main {
    flex-grow: 1;
    display: grid;
    grid-template-columns: 1fr;
    gap: 1rem;
    padding: 1rem;
    width: 100%;
}

#inputs-column, #outputs-column {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    min-width: 0;
    width: 100%;
}

/* ─── CARDS ─── */
.card {
    background-color: var(--surface);
    padding: 1.5rem;
    border-radius: var(--radius-sm);
    border: 1px solid var(--border);
    box-shadow: var(--shadow);
    transition: all var(--transition);
    display: flex;
    flex-direction: column;
    min-width: 0;
    max-width: 100%;
    overflow: hidden;
}

.card h2 {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--primary);
    margin: 0 0 1.5rem 0;
    padding-bottom: 0.75rem;
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

body.dark-theme .card h2 { color: var(--text); }

.card p {
    color: var(--text-secondary);
    font-size: 0.9rem;
    line-height: 1.6;
}

/* ─── INPUTS ─── */
.input-group { margin-bottom: 1rem; width: 100%; }
.input-group:last-child { margin-bottom: 0; }

.input-group label {
    display: block;
    font-size: .8rem;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: .4rem;
}

.input-group select,
.input-group input[type="text"],
.input-group input[type="number"] {
    width: 100%;
    padding: .7rem .85rem;
    border: 2px solid var(--border);
    border-radius: var(--radius-sm);
    background-color: var(--bg);
    color: var(--text);
    font-size: .9rem;
    font-family: var(--font);
    transition: border-color .2s, box-shadow .2s;
    -webkit-appearance: none;
    appearance: none;
}

.input-group select:disabled,
.input-group input:disabled { opacity: 0.6; cursor: not-allowed; }

.input-group select:focus,
.input-group input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.15);
}

.radio-group { display: flex; flex-wrap: wrap; gap: 0.5rem; align-items: center; margin: 1rem 0; }
.radio-group label { display: flex; align-items: center; gap: 0.4rem; cursor: pointer; font-size: 0.85rem; color: var(--text-secondary); }
.radio-group label input { width: auto; }

/* ─── BUTTONS ─── */
.main-button {
    padding: .85rem; border: none; border-radius: var(--radius-sm); font-size: .9rem;
    font-weight: bold; cursor: pointer; transition: all var(--transition);
    display: inline-flex; align-items: center; justify-content: center; gap: 0.5rem; flex: 1;
    font-family: var(--font); background-color: var(--primary); color: white; width: 100%; margin-top: 0.5rem;
}

.main-button:hover { opacity: 0.9; transform: translateY(-1px); }

/* ─── RESULTS ─── */
#results-card .card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
    padding-bottom: 0.75rem;
    border-bottom: 1px solid var(--border);
}

#results-card .card-header h2 { border: none; margin: 0; padding: 0; }

.result-placeholder {
    text-align: center;
    padding: 2rem;
    color: var(--text-secondary);
    font-size: .9rem;
}

.result-placeholder i {
    font-size: 2.5rem;
    margin-bottom: .75rem;
    display: block;
    color: var(--border);
}

.result-content {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.result-header {
    background: var(--accent-light);
    border-radius: var(--radius-sm);
    padding: 1rem;
    text-align: center;
    border: 1px solid var(--accent);
    position: relative;
}

.result-header .label {
    display: block;
    font-size: .75rem;
    font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: .04em;
}

.result-header .designation-value {
    display: block;
    font-size: 1.75rem;
    font-weight: 800;
    color: var(--primary);
    line-height: 1.2;
    word-break: break-word;
}

body.dark-theme .result-header .designation-value { color: var(--accent); }

.result-header .copy-btn {
    position: absolute; top: 0.5rem; right: 0.5rem;
    background: var(--primary); color: white; border: none;
    width: 32px; height: 32px; border-radius: 6px;
    cursor: pointer; font-size: 0.9rem;
    display: flex; align-items: center; justify-content: center;
    transition: opacity 0.2s;
}
.result-header .copy-btn:hover { opacity: 0.85; }

/* ─── TABLES ─── */
.table-container { overflow-x: auto; width: 100%; max-width: 100%; }
table { width: 100%; border-collapse: collapse; text-align: left; }
th, td { padding: 0.65rem 1rem; border-bottom: 1px solid var(--border); vertical-align: middle; }
thead { background-color: var(--bg); }
thead th { font-weight: 700; color: var(--text); font-size: 0.8rem; text-transform: uppercase; letter-spacing: 0.04em; }
tbody tr { transition: background-color .15s ease; }
tbody tr:hover { background-color: var(--bg); }
.calc-title { font-size: 1.15rem; font-weight: 700; color: var(--primary); margin-bottom: 1rem; }

/* Primeira coluna com destaque (símbolos, nomes, códigos) */
.table-container table tbody tr td:first-child {
    font-weight: 700;
    font-size: 1.1rem;
    text-align: center;
    white-space: nowrap;
}

/* Group / subgroup headers em tabelas complexas (desktop) */
.complex-table-wrapper tbody tr.group-header td {
    background: var(--primary);
    color: white;
    font-weight: 800;
    text-align: center;
    padding: 0.5rem 0.75rem;
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    border-bottom: none;
}
.complex-table-wrapper tbody tr.subgroup-header td {
    background: var(--bg);
    font-weight: 700;
    text-align: left;
    padding: 0.4rem 0.75rem;
    font-size: 0.75rem;
    border-bottom: 2px solid var(--primary);
    color: var(--text);
}

/* ─── TOASTS ─── */
.toast-container { position: fixed; right: 20px; bottom: 20px; display: flex; flex-direction: column; gap: 10px; z-index: 9999; }
.toast { background: rgba(0,0,0,0.85); color: #fff; padding: 10px 14px; border-radius: 8px; box-shadow: 0 6px 18px rgba(0,0,0,0.3); font-weight: 500; opacity: 0; transform: translateY(10px); transition: all 0.25s ease; }
.toast.show { opacity: 1; transform: translateY(0); }

/* ─── THEME OVERRIDES ─── */
body.dark-theme .result-placeholder i { color: var(--text-secondary); }
body.dark-theme .table-container table { background-color: var(--surface); }
body.dark-theme table th, body.dark-theme table td { border-color: var(--border); }
body.dark-theme .complex-table-wrapper tbody tr.group-header td { background: #1e3a5f !important; }
body.dark-theme .complex-table-wrapper tbody tr.subgroup-header td { border-bottom-color: #3b82f6; }

/* ─── RESPONSIVE (DESKTOP) ─── */
@media (min-width: 1024px) {
    .app-main { grid-template-columns: 1fr 1fr; gap: 1.5rem; padding: 1.5rem; max-width: 1600px; margin: 0 auto; }
    #inputs-column, #outputs-column { gap: 1.5rem; }
}

/* ─── RESPONSIVE UNIFICADO (TABLETS E MOBILE) ─── */
@media (max-width: 768px) {
    .card { padding: 1rem; }
    .app-main { padding: 0.75rem; gap: 0.75rem; }
    #inputs-column, #outputs-column { gap: 0.75rem; }
    .result-header .designation-value { font-size: 1.4rem; }

    /* --- TODAS AS TABELAS: SCROLLÁVEL IGUAL DESKTOP --- */
    .table-container,
    .complex-table-wrapper {
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
        margin: 0.5rem 0;
        border-radius: var(--radius-sm);
        border: 1px solid var(--border);
    }

    .table-container table,
    .complex-table-wrapper table {
        font-size: 0.85rem;
        border-collapse: separate;
        border-spacing: 0;
        width: auto;
        min-width: 480px;
    }

    .table-container table th,
    .table-container table td,
    .complex-table-wrapper table th,
    .complex-table-wrapper table td {
        white-space: nowrap;
        padding: 0.5rem 0.7rem;
        text-align: center;
    }

    .table-container table th,
    .complex-table-wrapper table th {
        font-size: 0.75rem;
    }

    /* Coluna fixa (primeira) com sombra de transição */
    .table-container table th:first-child,
    .table-container table td:first-child,
    .complex-table-wrapper table th:first-child,
    .complex-table-wrapper table td:first-child {
        text-align: left;
        font-weight: 700;
        background: var(--surface);
        position: sticky;
        left: 0;
        z-index: 2;
    }

    .table-container table td:first-child::after,
    .table-container table th:first-child::after,
    .complex-table-wrapper table td:first-child::after,
    .complex-table-wrapper table th:first-child::after {
        content: '';
        position: absolute;
        right: -6px;
        top: 0;
        bottom: 0;
        width: 6px;
        background: linear-gradient(to right, rgba(0,0,0,0.08), transparent);
        pointer-events: none;
    }
    body.dark-theme .table-container table td:first-child::after,
    body.dark-theme .table-container table th:first-child::after,
    body.dark-theme .complex-table-wrapper table td:first-child::after,
    body.dark-theme .complex-table-wrapper table th:first-child::after {
        background: linear-gradient(to right, rgba(255,255,255,0.06), transparent);
    }

    /* Group / subgroup header em tabelas complexas no mobile */
    .complex-table-wrapper tbody tr.group-header td {
        background: var(--primary) !important;
        color: white !important;
        font-weight: 800;
        text-align: center;
        padding: 0.45rem 0.7rem;
        font-size: 0.78rem;
        text-transform: uppercase;
        letter-spacing: 0.06em;
    }
    body.dark-theme .complex-table-wrapper tbody tr.group-header td {
        background: #1e3a5f !important;
    }

    .complex-table-wrapper tbody tr.subgroup-header td {
        background: var(--bg) !important;
        color: var(--text) !important;
        font-weight: 700;
        text-align: left;
        padding: 0.35rem 0.7rem;
        font-size: 0.72rem;
        border-bottom: 2px solid var(--primary);
    }

    /* Ajuste dos subtítulos e listas dentro das tabelas */
    .complex-table-wrapper h4 {
        font-size: 0.85rem;
        margin-bottom: 0.5rem;
        padding: 0 0.25rem;
    }
    .complex-table-wrapper ul {
        margin-top: 0.75rem;
        padding-left: 1.25rem;
        font-size: 0.82rem;
    }

    /* Calc title no mobile */
    .calc-title {
        font-size: 1rem;
        margin-bottom: 0.75rem;
    }
}

/* ─── MICRO-TWEAKS PARA TELAS MINÚSCULAS ─── */
@media (max-width: 480px) {
    .card { padding: 0.75rem; }
    .app-main { padding: 0.5rem; gap: 0.5rem; }
    #inputs-column, #outputs-column { gap: 0.5rem; }
    .card h2 { font-size: 1rem; gap: 0.5rem; }
    input, select { font-size: 0.85rem; padding: 0.6rem 0.7rem; }
    .main-button { font-size: 0.85rem; padding: 0.7rem; }
    .result-header .designation-value { font-size: 1.2rem; }

    .table-container table,
    .complex-table-wrapper table {
        min-width: 360px;
        font-size: 0.78rem;
    }
    .table-container table th,
    .table-container table td,
    .complex-table-wrapper table th,
    .complex-table-wrapper table td {
        padding: 0.4rem 0.5rem;
    }
}