/* =========================
   CSS VARIABLES
========================= */
:root {
    --bg-main: #0f172a;
    --bg-table: #020617;
    --bg-row: #1e293b;
    --bg-row-hover: #334155;
    --bg-card: #1e293b;
    --bg-card-hover: #334155;
    --text-main: #f8fafc;
    --text-muted: #cbd5e1;
    --accent: #38bdf8;
}

/* =========================
   GLOBAL RESET
========================= */
* {
    box-sizing: border-box;
}

/* =========================
   BODY
========================= */
body {
    background-color: var(--bg-main);
    color: var(--text-main);
    font-family: 'Montserrat', sans-serif;
    margin: 0;
    line-height: 1.6;
}

/* =========================
   NAVIGATION
========================= */
.nav-link {
    color: var(--text-muted);
    font-weight: 600;
}

.nav-link:hover {
    color: var(--accent);
}

.nav-pills .nav-link {
    background-color: var(--bg-card);
    margin: 0 5px;
    padding: 10px 20px;
    border-radius: 0;
    transition: 0.2s;
}

.nav-pills .nav-link:hover {
    color: var(--accent);
    background-color: var(--bg-card-hover);
}

.nav-pills .nav-link.active {
    background-color: #0ea5e9;
    color: #020617;
}

/* =========================
   PAGE TITLE & LEAD
========================= */
.page-title {
    font-family: 'Playfair Display', serif;
    font-size: clamp(1.8rem, 4vw, 3rem);
    margin-bottom: 1rem;
}

.lead {
    max-width: 900px;
    margin: 0 auto;
    color: var(--text-muted);
}

/* =========================
   TABLE
========================= */
.comparison-table {
    width: 100%;
}

.comparison-table thead th {
    background-color: var(--bg-table);
    text-transform: uppercase;
    font-size: 0.85rem;
    letter-spacing: 0.05em;
    border-bottom: none;
}

.comparison-table tbody tr {
    background-color: var(--bg-row);
}

.comparison-table tbody tr:hover {
    background-color: var(--bg-row-hover);
}

.comparison-table th,
.comparison-table td {
    vertical-align: middle;
    padding: 0.45rem;
}

/* =========================
   SORTABLE COLUMNS
========================= */
th.sortable {
    cursor: pointer;
    color: var(--accent);
    transition: color 0.2s;
}

th.sortable:hover {
    color: #fff;
    text-decoration: underline;
}

/* =========================
   PROVIDER CARDS
========================= */
.provider-card {
    position: relative;
    padding: 20px;
    text-align: center;
    color: var(--text-main);
    font-weight: 600;
    border-radius: 15px;
    background: linear-gradient(145deg, #1e293b, #27334d);
    box-shadow: 0 6px 15px rgba(0,0,0,0.5);
    transition: transform 0.3s ease, box-shadow 0.3s ease, background 0.3s ease;
    overflow: hidden;
}

.provider-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 14px 30px rgba(56, 189, 248, 0.6);
    background: linear-gradient(145deg, #2c3e50, #3a4a62);
}

.provider-card img {
    width: 80px;
    height: 80px;
    object-fit: contain;
    margin-bottom: 12px;
}

.provider-card h5 {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    margin: 0;
    padding: 6px 0;
    background: rgba(0, 0, 0, 0.5);
    font-size: 1rem;
    font-weight: 700;
    letter-spacing: 0.5px;
}

/* =========================
   FOOTER
========================= */
footer {
    margin-top: 4rem;
    padding-top: 2rem;
    font-size: 0.9rem;
    color: var(--text-muted);
}

/* =========================
   RESPONSIVE RULES
========================= */

/* TABLET (≤ 992px): name, price, GB, units */
@media (max-width: 992px) {
    .comparison-table th:nth-child(n+5),
    .comparison-table td:nth-child(n+5) {
        display: none;
    }
}


/* MOBILE (≤ 768px): name, price, GB */
@media (max-width: 768px) {
    .comparison-table th:nth-child(n+4),
    .comparison-table td:nth-child(n+4) {
        display: none;
    }

    .page-title {
        font-size: 1.6rem;
    }

    .lead {
        font-size: 0.95rem;
        padding: 0 10px;
    }
}


/* LARGE SCREENS (≥ 1200px): subtle card scaling */
@media (min-width: 1200px) {
    .provider-card {
        padding: 28px;
    }

    .provider-card img {
        width: 90px;
        height: 90px;
    }

    .provider-card h5 {
        font-size: 1.05rem;
    }

    footer {
        margin-top: 6rem;
    }
}