/* =========================
   CURRENCY CONVERTER CSS
   ========================= */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800;900&display=swap');

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

:root {
    --bg: #080d1a;
    --surface: rgba(255, 255, 255, 0.04);
    --surface-2: rgba(255, 255, 255, 0.07);
    --surface-hover: rgba(255, 255, 255, 0.09);
    --border: rgba(255, 255, 255, 0.08);
    --border-focus: rgba(99, 102, 241, 0.6);
    --text-primary: #f1f5f9;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;
    --accent: #6366f1;
    --accent-2: #818cf8;
    --accent-glow: rgba(99, 102, 241, 0.28);
    --green: #10b981;
    --green-light: rgba(16, 185, 129, 0.14);
    --red: #ef4444;
    --red-light: rgba(239, 68, 68, 0.12);
    --orange: #f59e0b;
    --card-radius: 24px;
    --input-radius: 14px;
    --ease: cubic-bezier(0.4, 0, 0.2, 1);
    --t: 0.22s;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', system-ui, sans-serif;
    background: var(--bg);
    color: var(--text-primary);
    min-height: 100vh;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
}

/* ── Utility ── */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
}

/* ── Background Blobs ── */
.bg-blobs {
    position: fixed;
    inset: 0;
    pointer-events: none;
    overflow: hidden;
    z-index: 0;
}

.blob {
    position: absolute;
    border-radius: 50%;
    filter: blur(100px);
    animation: drift 20s ease-in-out infinite alternate;
}

.blob-1 {
    width: 580px;
    height: 580px;
    background: radial-gradient(circle, rgba(99, 102, 241, 0.22) 0%, transparent 70%);
    top: -200px;
    left: -200px;
}

.blob-2 {
    width: 440px;
    height: 440px;
    background: radial-gradient(circle, rgba(16, 185, 129, 0.16) 0%, transparent 70%);
    bottom: -160px;
    right: -160px;
    animation-delay: -10s;
}

.blob-3 {
    width: 320px;
    height: 320px;
    background: radial-gradient(circle, rgba(245, 158, 11, 0.1) 0%, transparent 70%);
    top: 45%;
    left: 60%;
    animation-delay: -5s;
}

@keyframes drift {
    0% {
        transform: translate(0, 0) scale(1);
    }

    100% {
        transform: translate(50px, 35px) scale(1.1);
    }
}

/* ── Main Card ── */
.converter-card {
    position: relative;
    z-index: 1;
    max-width: 820px;
    margin: 2.5rem auto;
    padding: 0 1rem 3rem;
}

/* ── Header ── */
header {
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--border);
    border-radius: var(--card-radius);
    padding: 1.5rem 2rem 2rem;
    margin-bottom: 1.25rem;
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
}

.header-top {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
}

.header-badges {
    display: flex;
    gap: 0.5rem;
    align-items: center;
}

.badge {
    font-size: 0.7rem;
    font-weight: 700;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    padding: 0.3rem 0.75rem;
    border-radius: 50px;
    display: flex;
    align-items: center;
    gap: 0.35rem;
}

.badge-live {
    background: rgba(16, 185, 129, 0.15);
    color: var(--green);
    border: 1px solid rgba(16, 185, 129, 0.3);
}

.live-dot {
    width: 7px;
    height: 7px;
    border-radius: 50%;
    background: var(--green);
    animation: pulse-dot 1.8s ease-in-out infinite;
}

@keyframes pulse-dot {

    0%,
    100% {
        opacity: 1;
        transform: scale(1);
    }

    50% {
        opacity: 0.5;
        transform: scale(0.7);
    }
}

.badge-updated {
    background: var(--surface-2);
    color: var(--text-muted);
    border: 1px solid var(--border);
    font-weight: 500;
    text-transform: none;
    letter-spacing: 0;
    font-size: 0.72rem;
}

.btn-refresh {
    background: var(--surface-2);
    border: 1px solid var(--border);
    border-radius: 10px;
    color: var(--text-secondary);
    cursor: pointer;
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.1rem;
    transition: all var(--t) var(--ease);
}

.btn-refresh:hover {
    background: var(--accent-glow);
    border-color: var(--accent);
    color: var(--accent-2);
}

.refresh-icon {
    display: inline-block;
    transition: transform 0.6s var(--ease);
}

.btn-refresh:active .refresh-icon,
.refresh-icon.spinning {
    animation: spin 0.6s linear;
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

.title-area {
    text-align: center;
}

.title-icon {
    font-size: 2.8rem;
    line-height: 1;
    margin-bottom: 0.5rem;
}

h1 {
    font-size: clamp(1.6rem, 4vw, 2.2rem);
    font-weight: 800;
    background: linear-gradient(135deg, #f1f5f9, var(--accent-2), var(--green));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    line-height: 1.1;
    margin-bottom: 0.4rem;
}

header p {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* ── Conversion Panel ── */
.conversion-panel {
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--border);
    border-radius: var(--card-radius);
    padding: 2rem;
    margin-bottom: 1.25rem;
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
}

/* Amount Input */
.amount-group {
    margin-bottom: 1.5rem;
}

.amount-wrapper {
    position: relative;
    display: flex;
    align-items: center;
    background: var(--surface-2);
    border: 2px solid var(--border);
    border-radius: var(--input-radius);
    overflow: hidden;
    transition: border-color var(--t) var(--ease), box-shadow var(--t) var(--ease);
}

.amount-wrapper:focus-within {
    border-color: var(--accent);
    box-shadow: 0 0 0 4px var(--accent-glow);
    background: rgba(99, 102, 241, 0.06);
}

.amount-input {
    width: 100%;
    background: transparent;
    border: none;
    outline: none;
    color: var(--text-primary);
    font-family: inherit;
    font-size: 2rem;
    font-weight: 700;
    padding: 1rem 1.25rem 1rem 1.25rem;
    letter-spacing: -0.02em;
}

.amount-input::placeholder {
    color: var(--text-muted);
    font-weight: 400;
    font-size: 1.5rem;
}

input[type=number]::-webkit-inner-spin-button,
input[type=number]::-webkit-outer-spin-button {
    -webkit-appearance: none;
    margin: 0;
}

input[type=number] {
    -moz-appearance: textfield;
}

.amount-currency-hint {
    padding: 0 1.25rem;
    font-size: 1rem;
    font-weight: 700;
    color: var(--accent-2);
    white-space: nowrap;
    border-left: 1px solid var(--border);
    height: 100%;
    display: flex;
    align-items: center;
}

/* Selectors Row */
.selectors-row {
    display: grid;
    grid-template-columns: 1fr auto 1fr;
    gap: 0.75rem;
    align-items: end;
    margin-bottom: 1.5rem;
}

.currency-select-group {
    display: flex;
    flex-direction: column;
    gap: 0.4rem;
}

.select-label {
    font-size: 0.78rem;
    font-weight: 700;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.07em;
}

.select-wrapper {
    display: flex;
    align-items: center;
    gap: 0;
    background: var(--surface-2);
    border: 1.5px solid var(--border);
    border-radius: var(--input-radius);
    overflow: hidden;
    transition: border-color var(--t), box-shadow var(--t);
}

.select-wrapper:focus-within {
    border-color: var(--accent);
    box-shadow: 0 0 0 3px var(--accent-glow);
}

.currency-flag {
    padding: 0 0.5rem 0 0.9rem;
    font-size: 1.3rem;
    pointer-events: none;
}

.currency-select {
    flex: 1;
    background: transparent;
    border: none;
    outline: none;
    color: var(--text-primary);
    font-family: inherit;
    font-size: 1rem;
    font-weight: 600;
    padding: 0.8rem 0.5rem 0.8rem 0;
    cursor: pointer;
    appearance: none;
    -webkit-appearance: none;
}

.currency-select option {
    background: #1a2035;
    color: var(--text-primary);
}

/* Swap Button */
.swap-btn {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    cursor: pointer;
    align-self: center;
    background: linear-gradient(135deg, var(--accent), #7c3aed);
    border: none;
    color: #fff;
    font-size: 1.2rem;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 4px 20px rgba(99, 102, 241, 0.4);
    transition: transform var(--t) var(--ease), box-shadow var(--t) var(--ease), filter var(--t);
    margin-top: 1.4rem;
}

.swap-btn:hover {
    transform: rotate(180deg) scale(1.1);
    box-shadow: 0 6px 28px rgba(99, 102, 241, 0.55);
}

.swap-btn:active {
    transform: rotate(180deg) scale(0.96);
}

.swap-icon {
    display: inline-block;
    transition: transform 0.4s var(--ease);
}

/* Result Display */
.result-display {
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.1), rgba(99, 102, 241, 0.04));
    border: 1px solid rgba(99, 102, 241, 0.3);
    border-radius: 16px;
    padding: 1.75rem 1.5rem;
    text-align: center;
    margin-bottom: 1.5rem;
    min-height: 110px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.result-content {
    display: flex;
    flex-direction: column;
    gap: 0.35rem;
    width: 100%;
}

.result-amount {
    font-size: clamp(2rem, 5vw, 3rem);
    font-weight: 900;
    letter-spacing: -0.03em;
    background: linear-gradient(135deg, var(--text-primary), var(--accent-2));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    line-height: 1.1;
}

.result-rate {
    font-size: 0.9rem;
    color: var(--text-secondary);
    font-weight: 500;
}

.result-inverse {
    font-size: 0.8rem;
    color: var(--text-muted);
}

.result-error {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
    color: var(--red);
    font-size: 0.9rem;
}

.error-icon {
    font-size: 1.5rem;
}

/* Skeleton */
.result-skeleton {
    width: 100%;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    align-items: center;
}

.skeleton-line {
    background: linear-gradient(90deg, rgba(255, 255, 255, 0.06) 25%, rgba(255, 255, 255, 0.12) 50%, rgba(255, 255, 255, 0.06) 75%);
    background-size: 200% 100%;
    border-radius: 8px;
    animation: shimmer 1.4s infinite;
}

.skeleton-lg {
    width: 60%;
    height: 40px;
}

.skeleton-sm {
    width: 40%;
    height: 16px;
}

@keyframes shimmer {
    0% {
        background-position: -200% 0;
    }

    100% {
        background-position: 200% 0;
    }
}

/* Quick Select */
.quick-select {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    flex-wrap: wrap;
}

.quick-label {
    font-size: 0.75rem;
    font-weight: 700;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.07em;
    white-space: nowrap;
}

.quick-buttons {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
}

.quick-btn {
    padding: 0.4rem 0.85rem;
    border-radius: 50px;
    border: 1.5px solid var(--border);
    background: var(--surface);
    color: var(--text-secondary);
    cursor: pointer;
    font-family: inherit;
    font-size: 0.8rem;
    font-weight: 600;
    transition: all var(--t) var(--ease);
    white-space: nowrap;
}

.quick-btn:hover {
    border-color: var(--accent);
    color: var(--text-primary);
    background: var(--accent-glow);
}

.quick-btn.active {
    border-color: var(--accent);
    background: rgba(99, 102, 241, 0.2);
    color: var(--accent-2);
}

/* ── Chart Section ── */
.chart-section {
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--border);
    border-radius: var(--card-radius);
    padding: 1.75rem 2rem 1.5rem;
    margin-bottom: 1.25rem;
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
}

.chart-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
    flex-wrap: wrap;
    gap: 0.75rem;
}

.chart-header h2 {
    font-size: 1rem;
    font-weight: 700;
    color: var(--text-secondary);
}

/* Period Toggle */
.period-toggle {
    display: flex;
    gap: 0.3rem;
}

.period-btn {
    padding: 0.35rem 0.75rem;
    border-radius: 8px;
    border: 1.5px solid var(--border);
    background: transparent;
    color: var(--text-muted);
    cursor: pointer;
    font-family: inherit;
    font-size: 0.78rem;
    font-weight: 700;
    letter-spacing: 0.04em;
    transition: all var(--t) var(--ease);
}

.period-btn:hover {
    border-color: var(--accent);
    color: var(--text-primary);
}

.period-btn.active {
    background: var(--accent);
    border-color: var(--accent);
    color: #fff;
}

/* Chart Stats */
.chart-stats {
    display: flex;
    gap: 1.5rem;
    margin-bottom: 1rem;
    flex-wrap: wrap;
    background: var(--surface);
    border-radius: 10px;
    padding: 0.75rem 1rem;
}

.stat-item {
    display: flex;
    flex-direction: column;
    gap: 0.15rem;
}

.stat-label {
    font-size: 0.65rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.07em;
    color: var(--text-muted);
}

.stat-value {
    font-size: 0.9rem;
    font-weight: 700;
    color: var(--text-primary);
    font-variant-numeric: tabular-nums;
}

.stat-high {
    color: var(--green);
}

.stat-low {
    color: var(--red);
}

/* Chart Container */
.chart-container {
    position: relative;
    height: 200px;
}

.chart-loading {
    position: absolute;
    inset: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
    color: var(--text-muted);
    font-size: 0.85rem;
}

.spinner {
    width: 28px;
    height: 28px;
    border: 3px solid var(--border);
    border-top-color: var(--accent);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

/* ── Popular Pairs ── */
.popular-pairs {
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--border);
    border-radius: var(--card-radius);
    padding: 1.75rem 2rem;
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
}

.popular-pairs h2 {
    font-size: 1rem;
    font-weight: 700;
    color: var(--text-secondary);
    margin-bottom: 1rem;
}

.pairs-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 0.75rem;
}

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

/* Pair Card */
.pair-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 14px;
    padding: 1rem;
    cursor: pointer;
    transition: all var(--t) var(--ease);
}

.pair-card:hover {
    background: var(--surface-hover);
    border-color: var(--accent);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.2);
}

.pair-card-label {
    font-size: 0.75rem;
    font-weight: 700;
    color: var(--text-muted);
    margin-bottom: 0.3rem;
}

.pair-card-rate {
    font-size: 1.05rem;
    font-weight: 800;
    color: var(--text-primary);
    font-variant-numeric: tabular-nums;
}

.pair-card-change {
    font-size: 0.72rem;
    font-weight: 600;
    margin-top: 0.2rem;
}

.pair-card-change.up {
    color: var(--green);
}

.pair-card-change.down {
    color: var(--red);
}

.pair-skeleton {
    background: linear-gradient(90deg, rgba(255, 255, 255, 0.04) 25%, rgba(255, 255, 255, 0.08) 50%, rgba(255, 255, 255, 0.04) 75%);
    background-size: 200% 100%;
    border-radius: 14px;
    height: 80px;
    animation: shimmer 1.4s infinite;
}

/* ── Responsive ── */
@media (max-width: 640px) {

    .conversion-panel,
    .chart-section,
    .popular-pairs {
        padding: 1.25rem;
    }

    header {
        padding: 1.25rem 1.25rem 1.5rem;
    }

    .selectors-row {
        grid-template-columns: 1fr auto 1fr;
        gap: 0.5rem;
    }

    .amount-input {
        font-size: 1.5rem;
    }

    .result-amount {
        font-size: 1.8rem;
    }

    .swap-btn {
        width: 40px;
        height: 40px;
        font-size: 1rem;
    }
}

@media (max-width: 420px) {
    .selectors-row {
        grid-template-columns: 1fr;
        gap: 0.75rem;
    }

    .swap-btn {
        margin: 0 auto;
    }

    .chart-stats {
        gap: 0.75rem;
    }
}