:root {
    --primary: #6366F1;
    --primary-hover: #818CF8;
    --accent: #F59E0B;

    --bg-app: #0B0E14;
    --glass-bg: rgba(18, 24, 38, 0.4);
    --glass-border: rgba(255, 255, 255, 0.08);
    --card-bg: rgba(25, 33, 50, 0.6);

    --text-main: #F8FAFC;
    --text-muted: #94A3B8;
    --text-dark: #64748B;

    --success: #10B981;
    --error: #EF4444;

    --font-sans: 'Inter', system-ui, sans-serif;
    --font-mono: 'JetBrains Mono', monospace;

    --radius-sm: 8px;
    --radius: 12px;
    --radius-lg: 16px;
}

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

body {
    font-family: var(--font-sans);
    background: var(--bg-app);
    color: var(--text-main);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    padding: 2rem 1rem;
}

.glass {
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--glass-border);
}

.app-container {
    width: 100%;
    max-width: 900px;
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

/* Header */
.top-nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 1.5rem;
    border-radius: var(--radius-lg);
}

.brand {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    color: var(--primary);
}

.brand svg {
    width: 24px;
    height: 24px;
}

.brand h1 {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--text-main);
    letter-spacing: -0.01em;
}

.docs-link {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--text-muted);
    text-decoration: none;
    font-size: 0.875rem;
    font-weight: 500;
    transition: color 0.2s;
}

.docs-link:hover {
    color: var(--text-main);
}

/* Raw Input Section */
.section-card {
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
}

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

.section-header h2 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.arn-input-wrapper {
    position: relative;
    display: flex;
    align-items: center;
}

.arn-input {
    width: 100%;
    background: rgba(0, 0, 0, 0.4);
    border: 1px solid var(--primary);
    border-radius: var(--radius);
    padding: 1.25rem 3.5rem 1.25rem 1.25rem;
    color: var(--accent);
    font-family: var(--font-mono);
    font-size: 1.125rem;
    font-weight: 500;
    box-shadow: 0 0 0 4px rgba(99, 102, 241, 0.1);
    transition: all 0.2s;
}

.arn-input:focus {
    outline: none;
    box-shadow: 0 0 0 4px rgba(99, 102, 241, 0.3);
}

.arn-input.error {
    border-color: var(--error);
    box-shadow: 0 0 0 4px rgba(239, 68, 68, 0.1);
    color: var(--error);
}

.arn-status {
    position: absolute;
    right: 1.25rem;
    display: flex;
    align-items: center;
    justify-content: center;
}

.status-icon {
    width: 24px;
    height: 24px;
}

.status-icon.wait {
    color: var(--text-dark);
}

.error-text {
    color: var(--error);
    font-size: 0.875rem;
    font-weight: 500;
    display: none;
}

/* ARN Token Breakdown */
.arn-tokens {
    display: flex;
    overflow-x: auto;
    gap: 4px;
    padding: 0.5rem 0;
    align-items: stretch;
}

.token {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
    background: var(--card-bg);
    border: 1px solid var(--glass-border);
    padding: 0.5rem 0.75rem;
    border-radius: var(--radius-sm);
    min-width: 60px;
    transition: all 0.2s ease;
    cursor: pointer;
}

.token:hover,
.token.active {
    background: rgba(99, 102, 241, 0.15);
    border-color: var(--primary);
    transform: translateY(-2px);
}

.token .label {
    font-size: 0.65rem;
    color: var(--text-dark);
    font-weight: 600;
    text-transform: uppercase;
}

.token .value {
    font-family: var(--font-mono);
    font-size: 0.875rem;
    color: var(--text-main);
    white-space: nowrap;
    font-weight: 500;
}

.token[data-target="prefix"] .value {
    color: var(--text-muted);
}

.token[data-target="resource"] .value {
    color: var(--primary);
}

.colon {
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: var(--font-mono);
    color: var(--text-dark);
    font-weight: 700;
    font-size: 1.25rem;
    padding: 0 2px;
}

/* Builder Grid */
.builder-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1.5rem;
}

.builder-card {
    background: var(--card-bg);
    padding: 1.5rem;
    border-radius: var(--radius-lg);
    display: flex;
    flex-direction: column;
    gap: 1rem;
    transition: all 0.2s;
    outline: none;
}

.builder-card:focus-within,
.builder-card.active {
    border-color: var(--primary);
    box-shadow: 0 8px 24px rgba(99, 102, 241, 0.15);
    background: rgba(25, 33, 50, 0.8);
}

.resource-span {
    grid-column: 1 / -1;
}

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

.card-header h3 {
    font-size: 0.9375rem;
    font-weight: 600;
    color: var(--text-main);
}

.info-badge {
    font-size: 0.6875rem;
    font-weight: 600;
    text-transform: uppercase;
    background: rgba(239, 68, 68, 0.15);
    color: var(--error);
    padding: 0.125rem 0.375rem;
    border-radius: 4px;
}

.info-badge.info {
    background: rgba(99, 102, 241, 0.15);
    color: var(--primary);
}

.premium-input {
    width: 100%;
    background: rgba(0, 0, 0, 0.2);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-sm);
    padding: 0.75rem 1rem;
    color: var(--text-main);
    font-family: var(--font-sans);
    font-size: 0.9375rem;
    transition: all 0.2s;
}

.premium-input:focus {
    outline: none;
    border-color: var(--primary);
}

.resource-inputs {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.res-sep {
    font-family: var(--font-mono);
    color: var(--text-muted);
    font-weight: 700;
    font-size: 1.25rem;
}

.helper-text {
    font-size: 0.75rem;
    color: var(--text-dark);
    line-height: 1.4;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    font-family: var(--font-sans);
    font-weight: 500;
    border-radius: var(--radius-sm);
    border: 1px solid transparent;
    cursor: pointer;
    transition: all 0.2s;
}

.ghost-btn {
    background: transparent;
    color: var(--text-muted);
    border: 1px solid var(--glass-border);
}

.ghost-btn:hover {
    background: rgba(255, 255, 255, 0.05);
    color: var(--text-main);
}

.btn.small {
    padding: 0.4rem 0.8rem;
    font-size: 0.8125rem;
}

/* Toast */
.toast {
    position: fixed;
    bottom: 24px;
    right: 24px;
    background: var(--primary);
    color: white;
    padding: 12px 24px;
    border-radius: var(--radius-sm);
    font-size: 0.875rem;
    font-weight: 500;
    box-shadow: 0 10px 25px rgba(99, 102, 241, 0.4);
    transform: translateY(100px);
    opacity: 0;
    transition: all 0.3s cubic-bezier(0.68, -0.55, 0.265, 1.55);
    z-index: 100;
}

.toast.show {
    transform: translateY(0);
    opacity: 1;
}

@media (max-width: 768px) {
    .builder-grid {
        grid-template-columns: 1fr;
    }

    .resource-inputs {
        flex-direction: column;
        align-items: stretch;
    }

    .res-sep {
        display: none;
    }
}