/* ============================================================
   VzlaRate — BCV Exchange Rate Viewer & Converter
   Modern, clean, responsive design
   ============================================================ */

/* ----- CSS Custom Properties ----- */
:root {
    /* Colors */
    --color-bg:            #f0f4f8;
    --color-surface:       #ffffff;
    --color-primary:       #2563eb;
    --color-primary-dark:  #1d4ed8;
    --color-primary-light: #dbeafe;
    --color-secondary:     #7c3aed;
    --color-usd:           #059669;
    --color-usd-light:     #d1fae5;
    --color-eur:           #2563eb;
    --color-eur-light:     #dbeafe;
    --color-error:         #dc2626;
    --color-error-light:   #fef2f2;
    --color-success:       #059669;
    --color-success-light: #ecfdf5;
    --color-text:          #1e293b;
    --color-text-muted:    #64748b;
    --color-text-light:    #94a3b8;
    --color-border:        #e2e8f0;

    /* Shadows */
    --shadow-sm:   0 1px 2px rgba(0,0,0,0.05);
    --shadow-md:   0 4px 6px -1px rgba(0,0,0,0.07), 0 2px 4px -2px rgba(0,0,0,0.05);
    --shadow-lg:   0 10px 15px -3px rgba(0,0,0,0.08), 0 4px 6px -4px rgba(0,0,0,0.04);
    --shadow-xl:   0 20px 25px -5px rgba(0,0,0,0.08), 0 8px 10px -6px rgba(0,0,0,0.04);

    /* Borders */
    --radius-sm:  8px;
    --radius-md:  12px;
    --radius-lg:  16px;
    --radius-xl:  20px;

    /* Transitions */
    --transition: 200ms ease;
    --transition-slow: 350ms ease;
}

/* ----- Reset & Base ----- */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background: var(--color-bg);
    color: var(--color-text);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.container {
    width: 100%;
    max-width: 900px;
    margin: 0 auto;
    padding: 0 20px;
}

/* ----- Header ----- */
.header {
    background: linear-gradient(135deg, #1e293b 0%, #334155 100%);
    color: #fff;
    padding: 14px 0;
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: var(--shadow-lg);
}

.header-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
}

.logo-section {
    display: flex;
    align-items: center;
    gap: 14px;
}

.logo-icon {
    font-size: 2.4rem;
    line-height: 1;
}

.logo-title {
    font-size: 1.5rem;
    font-weight: 700;
    letter-spacing: -0.02em;
    line-height: 1.2;
}

.logo-subtitle {
    font-size: 0.8rem;
    color: #94a3b8;
    font-weight: 400;
}

.bcv-link {
    display: flex;
    align-items: center;
    gap: 8px;
    text-decoration: none;
    color: #cbd5e1;
    font-size: 0.85rem;
    padding: 8px 14px;
    border-radius: var(--radius-sm);
    border: 1px solid #475569;
    transition: all var(--transition);
}

.bcv-link:hover {
    background: rgba(255,255,255,0.08);
    color: #fff;
    border-color: #64748b;
}

.bcv-badge {
    background: var(--color-primary);
    color: #fff;
    font-weight: 700;
    font-size: 0.7rem;
    padding: 2px 6px;
    border-radius: 4px;
    letter-spacing: 0.05em;
}

.bcv-text {
    white-space: nowrap;
}

/* ----- Main Content ----- */
main {
    flex: 1;
    padding: 24px 0 32px;
}

/* ----- Error Banner ----- */
.error-banner {
    display: flex;
    align-items: center;
    gap: 10px;
    background: var(--color-error-light);
    border: 1px solid #fecaca;
    color: var(--color-error);
    padding: 14px 18px;
    border-radius: var(--radius-md);
    margin-bottom: 20px;
    font-size: 0.9rem;
    animation: slideDown 0.3s ease;
}

.error-icon {
    font-size: 1.2rem;
    flex-shrink: 0;
}

@keyframes slideDown {
    from { opacity: 0; transform: translateY(-8px); }
    to   { opacity: 1; transform: translateY(0); }
}

/* ----- Update Bar ----- */
.update-bar {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 14px;
    flex-wrap: wrap;
}

.refresh-btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    color: var(--color-text);
    padding: 8px 16px;
    border-radius: var(--radius-sm);
    font-size: 0.85rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition);
    box-shadow: var(--shadow-sm);
}

.refresh-btn:hover {
    background: var(--color-primary-light);
    border-color: var(--color-primary);
    color: var(--color-primary);
    box-shadow: var(--shadow-md);
}

.refresh-btn:active {
    transform: scale(0.97);
}

.refresh-icon {
    transition: transform 0.6s ease;
}

.refresh-btn:hover .refresh-icon {
    transform: rotate(180deg);
}

.update-date {
    font-size: 0.82rem;
    color: var(--color-text-muted);
    margin-left: auto;
}

.update-date strong {
    color: var(--color-text);
}

/* Mini spinner */
.mini-spinner {
    width: 16px;
    height: 16px;
    border: 2px solid var(--color-border);
    border-top-color: var(--color-primary);
    border-radius: 50%;
    animation: spin 0.7s linear infinite;
}

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

/* ----- Rates Grid ----- */
.rates-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
    margin-bottom: 20px;
}

@media (max-width: 640px) {
    .rates-grid {
        grid-template-columns: 1fr;
    }
}

/* ----- Rate Cards ----- */
.rate-card {
    background: var(--color-surface);
    border-radius: var(--radius-lg);
    padding: 16px 24px;
    box-shadow: var(--shadow-md);
    text-align: center;
    position: relative;
    overflow: hidden;
    transition: transform var(--transition-slow), box-shadow var(--transition-slow);
}

.rate-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-xl);
}

.rate-card-usd {
    border-top: 4px solid var(--color-usd);
}

.rate-card-eur {
    border-top: 4px solid var(--color-eur);
}

.rate-card-usd::before {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0;
    height: 80px;
    background: radial-gradient(ellipse at 50% 0%, rgba(5,150,105,0.06) 0%, transparent 70%);
    pointer-events: none;
}

.rate-card-eur::before {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0;
    height: 80px;
    background: radial-gradient(ellipse at 50% 0%, rgba(37,99,235,0.06) 0%, transparent 70%);
    pointer-events: none;
}

.card-flag {
    font-size: 1.6rem;
    margin-bottom: 4px;
    line-height: 1;
}

.card-header {
    margin-bottom: 8px;
}

.card-currency {
    font-size: 1rem;
    font-weight: 700;
    letter-spacing: 0.05em;
    color: var(--color-text);
}

.card-label {
    font-size: 0.75rem;
    color: var(--color-text-muted);
}

.card-rate {
    display: flex;
    align-items: baseline;
    justify-content: center;
    gap: 4px;
    margin-bottom: 2px;
}

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

.rate-value {
    font-size: 1.6rem;
    font-weight: 800;
    letter-spacing: -0.02em;
    color: var(--color-text);
    font-variant-numeric: tabular-nums;
}

.card-sub {
    font-size: 0.75rem;
    color: var(--color-text-light);
}

/* ----- Skeleton Loading ----- */
.skeleton {
    background: var(--color-surface);
    border-radius: var(--radius-lg);
    padding: 28px 24px;
    box-shadow: var(--shadow-sm);
    text-align: center;
    animation: pulse 1.5s ease-in-out infinite;
}

.skeleton-line {
    background: var(--color-border);
    border-radius: 4px;
    margin: 0 auto;
}

.skeleton-title {
    width: 56px;
    height: 12px;
    margin-bottom: 12px;
}

.skeleton-value {
    width: 112px;
    height: 24px;
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50%      { opacity: 0.5; }
}

/* ----- Converter Section ----- */
.converter-section {
    background: var(--color-surface);
    border-radius: var(--radius-xl);
    padding: 24px;
    box-shadow: var(--shadow-md);
}

.section-header {
    margin-bottom: 16px;
}

.section-title {
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--color-text);
    margin-bottom: 4px;
}

.section-desc {
    font-size: 0.85rem;
    color: var(--color-text-muted);
}

/* ----- Currency Radio Cards ----- */
.currency-radio-group {
    display: flex;
    gap: 12px;
    margin-bottom: 14px;
}

@media (max-width: 700px) {
    .currency-radio-group {
        flex-direction: column;
    }
}

.currency-radio-card {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 2px;
    padding: 12px;
    border: 2px solid var(--color-border);
    border-radius: var(--radius-md);
    background: var(--color-surface);
    cursor: pointer;
    user-select: none;
    transition: all var(--transition);
}

.currency-radio-card:hover {
    border-color: var(--color-primary);
    background: var(--color-primary-light);
}

.currency-radio-card.selected {
    border-color: var(--color-primary);
    background: var(--color-primary-light);
    box-shadow: var(--shadow-md);
}

.currency-radio-card:focus-within {
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(37,99,235,0.15);
}

/* Visually hidden radio, still keyboard-focusable */
.currency-radio-card input[type="radio"] {
    position: absolute;
    width: 1px;
    height: 1px;
    opacity: 0;
    overflow: hidden;
    clip: rect(0 0 0 0);
    white-space: nowrap;
}

.radio-icon {
    font-size: 2rem;
    line-height: 1;
}

.radio-code {
    font-size: 1rem;
    font-weight: 700;
    letter-spacing: 0.05em;
    color: var(--color-text);
}

.radio-name {
    font-size: 0.75rem;
    color: var(--color-text-muted);
}

/* ----- Amount Input ----- */
.amount-group {
    margin-bottom: 14px;
}

.input-label {
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--color-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.input-field {
    width: 100%;
    padding: 12px 16px;
    border: 2px solid var(--color-border);
    border-radius: var(--radius-md);
    font-size: 1rem;
    color: var(--color-text);
    background: var(--color-surface);
    transition: all var(--transition);
    font-family: inherit;
    outline: none;
    -moz-appearance: textfield;
}

.input-field::-webkit-inner-spin-button,
.input-field::-webkit-outer-spin-button {
    -webkit-appearance: none;
    margin: 0;
}

.input-field:focus {
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(37,99,235,0.1);
}

input.input-field::placeholder {
    color: var(--color-text-light);
}

/* ----- Convert Button ----- */
.convert-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    width: 100%;
    padding: 14px 24px;
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
    color: #fff;
    border: none;
    border-radius: var(--radius-md);
    font-size: 1.05rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition);
    box-shadow: 0 4px 12px rgba(37,99,235,0.3);
    font-family: inherit;
}

.convert-btn:hover {
    transform: translateY(-1px);
    box-shadow: 0 6px 20px rgba(37,99,235,0.4);
}

.convert-btn:active {
    transform: translateY(0);
    box-shadow: 0 2px 8px rgba(37,99,235,0.3);
}

.btn-text {
    letter-spacing: 0.02em;
}

/* ----- Result Area ----- */
.result-area {
    margin-top: 16px;
    min-height: 80px;
}

.result-placeholder {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 10px;
    padding: 24px;
    color: var(--color-text-light);
    font-size: 0.9rem;
    border: 2px dashed var(--color-border);
    border-radius: var(--radius-lg);
    text-align: center;
}

.placeholder-icon {
    flex-shrink: 0;
}

/* Result card */
.result-card {
    padding: 24px;
    border-radius: var(--radius-lg);
    animation: slideUp 0.35s ease;
}

@keyframes slideUp {
    from { opacity: 0; transform: translateY(12px); }
    to   { opacity: 1; transform: translateY(0); }
}

.result-error {
    background: var(--color-error-light);
    border: 2px solid #fecaca;
    display: flex;
    align-items: center;
    gap: 12px;
    color: var(--color-error);
}

.result-error-icon {
    font-size: 1.4rem;
    flex-shrink: 0;
}

/* ----- Conversion Results ----- */
.conversion-results {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
}

@media (max-width: 640px) {
    .conversion-results {
        grid-template-columns: 1fr;
    }
}

.conversion-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 2px;
    padding: 14px 12px;
    background: var(--color-surface);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-lg);
    text-align: center;
    animation: slideUp 0.35s ease;
}

.conversion-card.source {
    border-color: var(--color-primary);
    background: var(--color-primary-light);
    box-shadow: var(--shadow-md);
}

.conversion-flag {
    font-size: 2rem;
    line-height: 1;
    margin-bottom: 4px;
}

.conversion-code {
    font-size: 0.85rem;
    font-weight: 700;
    letter-spacing: 0.05em;
    color: var(--color-text);
}

.conversion-label {
    font-size: 0.7rem;
    color: var(--color-text-muted);
    margin-bottom: 8px;
}

.conversion-amount {
    font-size: 1.35rem;
    font-weight: 800;
    color: var(--color-text);
    font-variant-numeric: tabular-nums;
}

.conversion-badge {
    margin-top: 8px;
    font-size: 0.65rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--color-primary);
    background: rgba(37,99,235,0.1);
    padding: 3px 8px;
    border-radius: 999px;
}

/* ----- Loading Spinner ----- */
.loading-spinner-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
    padding: 24px;
    color: var(--color-text-muted);
    font-size: 0.85rem;
}

.loading-spinner {
    width: 36px;
    height: 36px;
    border: 3px solid var(--color-border);
    border-top-color: var(--color-primary);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

/* HTMX indicator: hidden by default, shown during requests */
.htmx-indicator {
    display: none;
}

.htmx-request .htmx-indicator,
.htmx-request.htmx-indicator {
    display: flex;
}

/* Hide placeholder when requesting */
.htmx-request #result-placeholder {
    display: none;
}

/* ----- Footer ----- */
.footer {
    background: #1e293b;
    color: #94a3b8;
    padding: 14px 0;
    margin-top: auto;
    font-size: 0.8rem;
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 8px;
}

.footer a {
    color: #cbd5e1;
    text-decoration: none;
    transition: color var(--transition);
}

.footer a:hover {
    color: #fff;
}

.footer-disclaimer {
    font-size: 0.75rem;
    color: #64748b;
}

.footer-version {
    font-size: 0.75rem;
    color: #64748b;
}

@media (max-width: 500px) {
    .footer-content {
        flex-direction: column;
        text-align: center;
    }
}

/* ----- Utility: hide element ----- */
.htmx-request .hide-on-request {
    display: none;
}