:root {
    --bg-gradient: radial-gradient(circle at top right, #064e3b 0%, #020617 40%, #000000 100%);
    --card-bg: rgba(255, 255, 255, 0.04);
    --card-border: rgba(16, 185, 129, 0.2);
    --text-main: #f8fafc;
    --text-muted: #94a3b8;
    --primary: #10b981;
    --primary-hover: #059669;
    --accent: #0ea5e9;
    --success: #10b981;
    --success-bg: rgba(16, 185, 129, 0.1);
    --danger: #ef4444;
    --danger-bg: rgba(239, 68, 68, 0.1);
}

/* Light Theme Overrides */
/* Light Theme Overrides */
body.light-theme {
    --bg-gradient: radial-gradient(circle at top right, #94a3b8 0%, #cbd5e1 40%, #e2e8f0 100%);
    --card-bg: rgba(241, 245, 249, 0.85);
    --card-border: rgba(0, 0, 0, 0.15);
    --text-main: #0f172a;
    --text-muted: #334155;
    --primary: #059669;
    --accent: #0284c7;
    /* In light mode, background pattern is subtle dark lines */
    background: 
        var(--bg-gradient),
        linear-gradient(rgba(0,0,0,0.04) 1px, transparent 1px),
        linear-gradient(90deg, rgba(0,0,0,0.04) 1px, transparent 1px);
    background-size: 100% 100%, 30px 30px, 30px 30px;
}
body.light-theme .glass-card {
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.05);
}
body.light-theme .brand-text {
    background: linear-gradient(135deg, #065f46 0%, #0369a1 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}
body.light-theme .rate-item {
    background: rgba(248, 250, 252, 0.9);
    border: 1px solid rgba(0, 0, 0, 0.12);
    box-shadow: 0 2px 4px rgba(0,0,0,0.03);
}
body.light-theme input, 
body.light-theme select {
    background: rgba(0, 0, 0, 0.05);
    border: 1px solid rgba(0, 0, 0, 0.15);
}
body.light-theme .ticker-container {
    background: rgba(226, 232, 240, 0.85);
    border-top: 1px solid rgba(0,0,0,0.08);
    border-bottom: 1px solid rgba(0,0,0,0.08);
    color: #0f172a;
}
body.light-theme .news-item { border-bottom-color: rgba(0,0,0,0.1); }
body.light-theme .share-buttons { border-top-color: rgba(0,0,0,0.1); }
body.light-theme .tab-btn:hover { background: rgba(0,0,0,0.05); color: var(--text-main); }
body.light-theme .trend-badge { background: rgba(0,0,0,0.05); color: #0f172a; border-color: rgba(0,0,0,0.1); }
body.light-theme .trend-up-bg { background: var(--success-bg); color: var(--success); border-color: var(--success); }
body.light-theme .trend-down-bg { background: var(--danger-bg); color: var(--danger); border-color: var(--danger); }

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

body {
    font-family: 'Inter', system-ui, -apple-system, sans-serif;
    background: 
        var(--bg-gradient),
        linear-gradient(rgba(255,255,255,0.015) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255,255,255,0.015) 1px, transparent 1px);
    background-size: 100% 100%, 30px 30px, 30px 30px;
    color: var(--text-main);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    padding: 20px;
    background-attachment: fixed;
}

header {
    text-align: center;
    margin-bottom: 2rem;
    padding: 20px 0;
}

header h1 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
}

.brand-text {
    background: linear-gradient(to right, var(--primary), var(--accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.ad-banner {
    background: var(--card-bg);
    border: 1px dashed var(--card-border);
    border-radius: 12px;
    padding: 20px;
    text-align: center;
    color: var(--text-muted);
    margin-bottom: 2rem;
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 90px;
}

main {
    max-width: 800px;
    margin: 0 auto;
    width: 100%;
    flex: 1;
}

/* Glassmorphism Tabs */
.tabs {
    display: flex;
    gap: 10px;
    margin-bottom: 1.5rem;
    background: var(--card-bg);
    padding: 8px;
    border-radius: 16px;
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid var(--card-border);
}

.tab-btn {
    flex: 1;
    background: transparent;
    border: none;
    color: var(--text-muted);
    padding: 12px 20px;
    border-radius: 10px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
}

.tab-btn.active {
    background: rgba(255, 255, 255, 0.1);
    color: var(--text-main);
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

.tab-btn:hover:not(.active) {
    background: rgba(255, 255, 255, 0.05);
}

.tab-content {
    display: none;
    animation: fadeIn 0.4s ease forwards;
}

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

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

/* Ticker (Son Dakika) */
.ticker-wrap {
    display: flex;
    align-items: center;
    background: var(--card-bg);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid var(--card-border);
    border-radius: 12px;
    margin-bottom: 1.5rem;
    overflow: hidden;
    height: 40px;
}

.ticker-heading {
    background: linear-gradient(135deg, var(--primary), var(--accent));
    color: #fff;
    padding: 0 15px;
    font-weight: 700;
    font-size: 0.85rem;
    line-height: 40px;
    white-space: nowrap;
    z-index: 2;
    box-shadow: 2px 0 5px rgba(0,0,0,0.2);
}

.ticker {
    flex: 1;
    overflow: hidden;
    position: relative;
    white-space: nowrap;
}

.ticker-content {
    display: inline-block;
    padding-left: 100%;
    animation: tickerScroll 45s linear infinite;
    line-height: 40px;
    font-size: 0.9rem;
}

.ticker-content:hover {
    animation-play-state: paused;
}

@keyframes tickerScroll {
    0% { transform: translate3d(0, 0, 0); }
    100% { transform: translate3d(-100%, 0, 0); }
}

.ticker-item {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    margin-right: 2rem;
}

.trend-up {
    color: var(--success);
}
.trend-down {
    color: var(--danger);
}
.trend-flat {
    color: var(--text-muted);
}

/* Cards */
.glass-card {
    background: var(--card-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--card-border);
    border-top: 1px solid rgba(255, 255, 255, 0.15);
    border-radius: 16px;
    padding: 24px;
    box-shadow: 0 15px 35px rgba(0, 0, 0, 0.4), inset 0 1px 0 rgba(255, 255, 255, 0.1), 0 0 20px rgba(16, 185, 129, 0.05);
}

/* Rates Grid */
.rates-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 16px;
    margin-top: 20px;
}

.rate-item {
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--card-border);
    border-radius: 12px;
    padding: 16px;
    text-align: center;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    overflow: hidden;
}

.rate-item::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: radial-gradient(circle at center, rgba(255,255,255,0.1) 0%, transparent 70%);
    opacity: 0;
    transition: opacity 0.3s;
}

.rate-item:hover {
    transform: translateY(-5px) scale(1.02);
    background: rgba(255, 255, 255, 0.08);
    box-shadow: 0 10px 20px rgba(0,0,0,0.2);
}

.rate-item:hover::before {
    opacity: 1;
}

.rate-item .price {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-main);
    transition: color 0.3s;
}

/* Flash Animations */
@keyframes flashUp {
    0% { background-color: var(--success-bg); }
    50% { background-color: rgba(16, 185, 129, 0.3); }
    100% { background-color: transparent; }
}

@keyframes flashDown {
    0% { background-color: var(--danger-bg); }
    50% { background-color: rgba(239, 68, 68, 0.3); }
    100% { background-color: transparent; }
}

.flash-up {
    animation: flashUp 1s ease-out;
}

.flash-down {
    animation: flashDown 1s ease-out;
}

.rate-item .code {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: 4px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
}

.rate-item .trend-badge {
    font-size: 0.75rem;
    padding: 2px 6px;
    border-radius: 6px;
    font-weight: 600;
}

.rate-item .trend-up-bg { background: var(--success-bg); color: var(--success); }
.rate-item .trend-down-bg { background: var(--danger-bg); color: var(--danger); }
.rate-item .trend-flat-bg { background: rgba(255,255,255,0.1); color: var(--text-muted); }

.rate-item .name {
    font-size: 0.8rem;
    color: var(--text-muted);
    margin-bottom: 12px;
}

.rate-item .price {
    font-size: 1.15rem;
    font-weight: 600;
    animation: valueUpdate 0.5s ease-out;
}

@keyframes valueUpdate {
    0% { transform: scale(0.95); opacity: 0.5; }
    100% { transform: scale(1); opacity: 1; }
}

/* Converter Form */
.converter-form {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.form-group label {
    font-size: 0.9rem;
    color: var(--text-muted);
}

.form-row {
    display: flex;
    gap: 16px;
    align-items: center;
}

@media (max-width: 600px) {
    .form-row {
        flex-direction: column;
        align-items: stretch;
    }
}

select, input {
    width: 100%;
    padding: 14px;
    background: rgba(0, 0, 0, 0.2);
    border: 1px solid var(--card-border);
    border-radius: 10px;
    color: var(--text-main);
    font-size: 1rem;
    outline: none;
    transition: border-color 0.3s;
}

select option {
    background-color: #1e293b;
    color: #f8fafc;
}

select:focus, input:focus {
    border-color: var(--primary);
}

.swap-btn {
    background: rgba(255, 255, 255, 0.1);
    border: none;
    color: var(--text-main);
    width: 44px;
    height: 44px;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s;
    margin-top: 24px;
}

@media (max-width: 600px) {
    .swap-btn {
        margin-top: 0;
        align-self: center;
        transform: rotate(90deg);
    }
}

.swap-btn:hover {
    background: var(--primary);
}

.result-box {
    margin-top: 10px;
    padding: 20px;
    background: rgba(0, 0, 0, 0.2);
    border-radius: 12px;
    text-align: center;
    border: 1px solid var(--card-border);
}

.result-box h3 {
    font-size: 2rem;
    color: var(--success);
    word-break: break-all;
}

/* Loader */
.loader {
    text-align: center;
    padding: 40px;
    color: var(--text-muted);
}

/* Share Buttons */
.share-buttons {
    display: flex;
    gap: 12px;
    justify-content: center;
    margin-top: 20px;
    padding-top: 20px;
    border-top: 1px solid var(--card-border);
}

.share-btn {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 10px 20px;
    border-radius: 8px;
    border: none;
    color: white;
    font-weight: 600;
    cursor: pointer;
    transition: transform 0.2s, opacity 0.2s;
}

.share-btn:hover {
    transform: translateY(-2px);
    opacity: 0.9;
}

.share-btn.whatsapp {
    background-color: #25D366;
}

.share-btn.twitter {
    background-color: #000000;
    border: 1px solid rgba(255,255,255,0.2);
}

/* News List */
.news-list {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.news-item {
    background: rgba(255,255,255,0.03);
    border: 1px solid var(--card-border);
    padding: 15px;
    border-radius: 8px;
    transition: background 0.2s;
}

.news-item:hover {
    background: rgba(255,255,255,0.08);
}

.news-item a {
    color: var(--primary);
    text-decoration: none;
    font-weight: 600;
    font-size: 1.05rem;
    display: block;
    margin-bottom: 6px;
}

.news-item a:hover {
    text-decoration: underline;
}

.news-item p {
    font-size: 0.85rem;
    color: var(--text-muted);
    line-height: 1.4;
}

.news-item small {
    display: block;
    margin-top: 8px;
    font-size: 0.75rem;
    color: rgba(255,255,255,0.4);
}

/* Footer */
footer {
    text-align: center;
    padding: 20px 0;
    margin-top: auto;
    color: var(--text-muted);
    font-size: 0.85rem;
}