:root {
    --bg-color: #0d1117;
    --card-bg: #161b22;
    --input-bg: #21262d;
    --primary: #238636;
    --accent: #2f81f7;
    --gold: #d2a106;
    --text-main: #f0f6fc;
    --text-sub: #8b949e;
    --border: 1px solid #30363d;
    --buy-green: #2ea043;
    --sell-red: #da3633;
}

* { margin: 0; padding: 0; box-sizing: border-box; font-family: 'Poppins', 'Padauk', sans-serif; }
body { background-color: var(--bg-color); color: var(--text-main); min-height: 100vh; display: flex; flex-direction: column; }

/* Navbar */
.navbar { background: var(--card-bg); border-bottom: var(--border); padding: 15px 0; }
.nav-container { max-width: 600px; margin: 0 auto; padding: 0 20px; display: flex; justify-content: space-between; align-items: center; }
.brand { display: flex; align-items: center; gap: 10px; }
.brand-icon { font-size: 1.5rem; color: var(--gold); }
.brand-text h1 { font-size: 1.1rem; font-weight: 700; }
.brand-text span { font-size: 0.7rem; color: var(--text-sub); }
.date-display { display: flex; align-items: center; gap: 6px; font-size: 0.75rem; color: var(--text-sub); background: rgba(255,255,255,0.05); padding: 5px 10px; border-radius: 20px; }
.status-dot { width: 8px; height: 8px; border-radius: 50%; background: #555; }
.status-dot.online { background: var(--buy-green); box-shadow: 0 0 8px var(--buy-green); }

/* Container */
.main-container { max-width: 600px; margin: 20px auto; padding: 0 15px; flex: 1; }
.hidden { display: none; }
.fade-in { animation: fadeIn 0.4s ease; }
@keyframes fadeIn { from { opacity: 0; transform: translateY(10px); } to { opacity: 1; transform: translateY(0); } }

/* Tabs */
.tabs { display: flex; gap: 10px; margin-bottom: 20px; background: var(--card-bg); padding: 4px; border-radius: 12px; border: var(--border); }
.tab-btn { flex: 1; background: none; border: none; color: var(--text-sub); padding: 10px; border-radius: 8px; font-weight: 500; cursor: pointer; display: flex; align-items: center; justify-content: center; gap: 6px; font-size: 0.9rem; transition: 0.3s; }
.tab-btn.active { background: var(--accent); color: white; }

/* Cards */
.card { background: var(--card-bg); border: var(--border); border-radius: 16px; padding: 20px; margin-bottom: 20px; }
.card-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 15px; }
.card-header h3 { font-size: 1rem; font-weight: 600; }
.status-live { font-size: 0.7rem; color: var(--buy-green); }

/* Grid Table */
.table-grid-header { display: grid; grid-template-columns: 1fr 1fr 1fr; padding-bottom: 10px; border-bottom: 1px solid rgba(255,255,255,0.1); margin-bottom: 10px; }
.table-grid-body .grid-row { display: grid; grid-template-columns: 1fr 1fr 1fr; padding: 12px 0; border-bottom: 1px solid rgba(255,255,255,0.05); align-items: center; }
.col-curr { font-size: 0.8rem; color: var(--text-sub); text-transform: uppercase; }
.col-val { font-size: 0.8rem; color: var(--text-sub); text-transform: uppercase; }
.text-right { text-align: right; }
.grid-row img { vertical-align: middle; margin-right: 8px; border-radius: 3px; }
.grid-row .val-buy { color: var(--buy-green); font-weight: 600; text-align: right; }
.grid-row .val-sell { color: var(--sell-red); font-weight: 600; text-align: right; }
.loading-row { text-align: center; padding: 20px; color: #555; font-style: italic; }

/* --- POLISHED CALCULATOR --- */
.calc-body { display: flex; flex-direction: column; gap: 15px; }

/* 1. Input Container */
.input-container {
    display: flex; align-items: center;
    background: var(--input-bg);
    border: 1px solid #30363d;
    border-radius: 12px;
    padding: 10px 15px;
    position: relative;
    transition: 0.2s;
}
.input-container:focus-within { border-color: var(--accent); }

.input-container input {
    background: transparent; border: none; color: white;
    font-size: 1.6rem; font-weight: 600; width: 100%; outline: none;
}

/* 2. Custom Select (The "Smooth" Dropdown) */
.currency-picker {
    display: flex; align-items: center; gap: 8px;
    padding: 8px 12px;
    background: rgba(255,255,255,0.05);
    border-radius: 8px;
    cursor: pointer;
    position: relative;
}
.currency-picker span { font-weight: 700; color: var(--accent); }
.currency-picker i { font-size: 0.8rem; color: var(--text-sub); }
/* The actual select is invisible but covers the area */
.currency-picker select {
    position: absolute; top: 0; left: 0; width: 100%; height: 100%;
    opacity: 0; cursor: pointer;
}

/* 3. Result Container */
.result-container {
    background: rgba(47, 129, 247, 0.05);
    border-radius: 12px;
    padding: 15px;
    text-align: center;
    border: 1px dashed rgba(47, 129, 247, 0.3);
}
.result-container .label { font-size: 0.7rem; color: var(--text-sub); text-transform: uppercase; letter-spacing: 1px; }
.result-container .value { font-size: 1.8rem; font-weight: 700; color: var(--text-main); line-height: 1.2; }
.result-container .unit { font-size: 0.9rem; font-weight: 600; color: var(--accent); }

.rate-info { text-align: center; font-size: 0.8rem; color: var(--text-sub); margin-bottom: 5px; }

/* 4. SEGMENTED CONTROL (Toggle) */
.segmented-control {
    display: flex; position: relative;
    background: var(--input-bg);
    border-radius: 30px; /* Pill shape */
    padding: 4px;
    border: 1px solid #30363d;
    height: 60px;
}
.control-bg {
    position: absolute; top: 4px; left: 4px;
    width: calc(50% - 4px); height: calc(100% - 8px);
    background: var(--buy-green);
    border-radius: 25px;
    transition: transform 0.3s cubic-bezier(0.2, 0.8, 0.2, 1), background 0.3s;
    z-index: 0;
    box-shadow: 0 4px 12px rgba(0,0,0,0.3);
}
.control-item {
    flex: 1; z-index: 1;
    display: flex; align-items: center; justify-content: center; gap: 10px;
    cursor: pointer; color: var(--text-sub);
    transition: color 0.2s;
}
.control-item.active { color: white; }
.control-item .icon { font-size: 1.2rem; }
.control-item .text { display: flex; flex-direction: column; line-height: 1.1; }
.control-item .title { font-size: 0.75rem; font-weight: 500; opacity: 0.9; }
.control-item .sub { font-size: 0.9rem; font-weight: 700; }

/* Logic States */
/* Mode BUY: Left Side (Default 0) */
.mode-buy .control-bg { transform: translateX(0); background: var(--buy-green); }
.mode-buy .control-item:first-child { color: white; }

/* Mode SELL: Right Side */
.mode-sell .control-bg { transform: translateX(100%); background: var(--sell-red); }
.mode-sell .control-item:last-child { color: white; }

/* Other Cards */
.gold-card { text-align: center; border-top: 3px solid var(--gold); }
.gold-icon { font-size: 2rem; color: var(--gold); margin-bottom: 10px; }
.price-big-display { font-size: 2rem; font-weight: 700; color: white; }
.row-item { display: flex; justify-content: space-between; padding: 10px 0; border-bottom: 1px solid rgba(255,255,255,0.05); }
.data-table { width: 100%; }
.data-table td { padding: 12px 0; border-bottom: 1px solid rgba(255,255,255,0.05); }

footer { text-align: center; padding: 20px; font-size: 0.8rem; color: #555; margin-top: auto; }