@import url('https://fonts.googleapis.com/css2?family=Poppins:wght@300;400;500;600&display=swap');

:root {
    --bg-main: #0f172a;
    --bg-soft: #1e293b;
    --bg-card: #1e293b;

    --primary: #3b82f6;
    --primary-dark: #1d4ed8;

    --border: #334155;

    --text-main: #e2e8f0;
    --text-sub: #94a3b8;

    --radius: 16px;
}

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

body {
    font-family: Poppins, sans-serif;
    background: var(--bg-main);
    color: var(--text-main);
}

/* HEADER */
header {
    text-align: center;
    padding: 50px 20px 30px;
    background: linear-gradient(135deg, #0f172a, #1d4ed8);
    color: #fff;
    box-shadow: 0 10px 30px rgba(0, 0, 0, .5);
}

header h1 {
    font-size: 30px;
    font-weight: 600;
}

header p {
    margin-top: 10px;
    font-size: 14px;
    color: var(--text-sub);
}

/* CONTACT */
.contact-bar {
    display: flex;
    justify-content: center;
    gap: 25px;
    padding: 12px;
    flex-wrap: wrap;
    font-size: 14px;
    color: var(--text-sub);
    background: var(--bg-soft);
    border-bottom: 1px solid var(--border);
}

/* LAYOUT */
.container {
    max-width: 1366px;
    margin: auto;
    padding: 30px 20px;
}

.grid {
    display: grid;
    gap: 25px;
    grid-template-columns: repeat(3, 1fr);
}

/* TAB */
.tabs {
    display: flex;
    justify-content: center;
    gap: 12px;
    margin-bottom: 30px;
    flex-wrap: wrap;
}

/* BUTTON */
.tab-btn {
    padding: 10px 20px;
    border-radius: 999px;
    border: 1px solid var(--border);

    background: rgba(255, 255, 255, 0.03);
    color: var(--text-sub);

    font-weight: 500;
    cursor: pointer;

    transition: all .25s ease;
    backdrop-filter: blur(6px);
}

.tab-btn:hover {
    color: #fff;
    border-color: var(--primary);
    background: rgba(59, 130, 246, 0.15);
    transform: translateY(-2px);
}

.tab-btn.active {
    color: #fff;
    background: linear-gradient(135deg, var(--primary), #60a5fa);
    border-color: var(--primary);
    box-shadow: 0 5px 15px rgba(59, 130, 246, 0.4);
}

.tab-btn:active {
    transform: scale(0.95);
}

.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
}

/* CARD */
.card {
    padding: 20px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    transition: .25s;
    box-shadow: 0 5px 20px rgba(0, 0, 0, .4);
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 35px rgba(0, 0, 0, .6);
}

.card h3 {
    margin-bottom: 10px;
    color: var(--primary);
}

/* GUIDE */
.guide-card {
    border-left: 4px solid var(--primary);
}

/* TEXT */
.subtitle {
    margin-bottom: 6px;
    font-size: 13px;
    color: var(--text-sub);
}

.guide-desc {
    margin: 10px 0 15px;
    font-size: 14px;
    line-height: 1.6;
    color: var(--text-sub);
}

/* LIST */
.tool-list {
    margin: 10px 0 15px;
    padding-left: 18px;
}

.tool-list li {
    margin-bottom: 6px;
    font-size: 14px;
    color: var(--text-sub);
}

/* VIDEO */
.video-wrapper {
    position: relative;
    width: 100%;
    padding-bottom: 56.25%;
    border-radius: 10px;
    overflow: hidden;
}

.video-wrapper iframe {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    border: none;
}

/* TABLE */
table {
    width: 100%;
    border-collapse: collapse;
    font-size: 14px;
}

thead {
    background: #020617;
}

th,
td {
    padding: 10px;
    border-bottom: 1px solid var(--border);
}

td {
    color: var(--text-sub);
}

/* EXTRA */
.underline {
    width: 40px;
    height: 3px;
    background: var(--primary);
    margin-bottom: 15px;
}

.note {
    margin-top: 15px;
    padding: 12px;
    font-size: 13px;
    background: #020617;
    border-left: 4px solid var(--primary);
    border-radius: 10px;
}

/* FOOTER */
.footer {
    margin-top: 40px;
    background: #020617;
    color: var(--text-sub);
}

.footer-container {
    max-width: 1400px;
    margin: auto;
    padding: 30px 20px;
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
}

.footer-col h3,
.footer-col h4 {
    margin-bottom: 10px;
    color: #fff;
}

.footer-col p {
    font-size: 14px;
    margin-bottom: 6px;
}

.footer-bottom {
    text-align: center;
    padding: 12px;
    font-size: 13px;
    border-top: 1px solid var(--border);
}

.footer a {
    color: #3b82f6;
    text-decoration: none;
    transition: 0.2s;
}

.footer a:hover {
    color: #60a5fa;
    text-decoration: underline;
}

/* RESPONSIVE */
@media (max-width: 1000px) {
    .grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 600px) {
    .grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .footer-container {
        grid-template-columns: 1fr;
        text-align: center;
    }
}