:root {
    --bg-color: #0f172a;
    --card-bg: rgba(30, 41, 59, 0.7);
    --primary: #8b5cf6;
    --primary-hover: #7c3aed;
    --primary-light: #c4aefd;
    --text-main: #f8fafc;
    --text-muted: #94a3b8;
    --border-color: rgba(148, 163, 184, 0.1);
    --glass-border: rgba(255, 255, 255, 0.1);
    --font-family: 'Outfit', sans-serif;
}

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

body {
    font-family: var(--font-family);
    background-color: var(--bg-color);
    background-image:
        radial-gradient(circle at 10% 20%, rgba(139, 92, 246, 0.15) 0%, transparent 40%),
        radial-gradient(circle at 90% 80%, rgba(56, 189, 248, 0.15) 0%, transparent 40%);
    color: var(--text-main);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    padding: 2rem;
}

.app-container {
    width: 100%;
    max-width: 900px;
}

/* Header */
.main-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 3rem;
    padding: 1rem;
    background: rgba(15, 23, 42, 0.6);
    backdrop-filter: blur(10px);
    border-radius: 16px;
    border: 1px solid var(--glass-border);
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-weight: 700;
    font-size: 1.25rem;
    color: var(--primary);
}

.nav-tabs {
    display: flex;
    gap: 0.5rem;
    background: rgba(0, 0, 0, 0.2);
    padding: 0.25rem;
    border-radius: 12px;
}

.nav-btn {
    background: transparent;
    border: none;
    color: var(--text-muted);
    padding: 0.5rem 1.25rem;
    border-radius: 8px;
    cursor: pointer;
    font-weight: 600;
    transition: all 0.3s ease;
}

.nav-btn.active {
    background: var(--primary);
    color: white;
    box-shadow: 0 4px 12px rgba(139, 92, 246, 0.3);
}

/* Cards & Glassmorphism */
.glass-panel {
    background: var(--card-bg);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 1px solid var(--glass-border);
    border-radius: 24px;
    padding: 2.5rem;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.2);
}

h2 {
    font-size: 1.75rem;
    margin-bottom: 0.5rem;
}

.subtitle {
    color: var(--text-muted);
    margin-bottom: 2rem;
}

/* Sections */
.view {
    display: none;
    animation: fadeIn 0.4s ease-out;
}

.view.active {
    display: block;
}

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

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Glass Panel Light (for Top Rows) */
.glass-panel-light {
    background: rgba(30, 41, 59, 0.4);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--glass-border);
    border-radius: 16px;
    padding: 1.5rem;
    margin-bottom: 2rem;
}

.pap-bar h3 {
    margin-bottom: 0.5rem;
    font-size: 0.85rem;
    color: var(--primary-light);
}

.pap-bar .form-row.compact {
    max-width: 400px;
    margin-bottom: 0;
}

/* Converter Grid */
.converter-grid {
    display: grid;
    grid-template-columns: 1fr auto 1fr;
    gap: 2rem;
    align-items: center;
}

.exchange-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.05);
    color: var(--text-muted);
}

h3 {
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--text-muted);
    margin-bottom: 1rem;
}

/* Forms */
label {
    display: block;
    font-size: 0.85rem;
    margin-bottom: 0.5rem;
    color: var(--text-main);
}

.select-wrapper {
    position: relative;
    margin-bottom: 1.5rem;
}

select,
input {
    width: 100%;
    padding: 0.75rem 1rem;
    background: rgba(0, 0, 0, 0.2);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    color: var(--text-main);
    font-family: inherit;
    font-size: 1rem;
    transition: border-color 0.2s;
}

select:focus,
input:focus {
    outline: none;
    border-color: var(--primary);
}

.inputs-container,
.outputs-container {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.read-only-field {
    padding: 0.75rem 1rem;
    background: rgba(139, 92, 246, 0.1);
    border: 1px solid rgba(139, 92, 246, 0.2);
    border-radius: 8px;
    color: var(--primary-light);
    font-weight: 600;
}

/* PAP Adjuster */
.pap-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
    margin-bottom: 2rem;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
    margin-bottom: 1rem;
}

.primary-btn {
    width: 100%;
    padding: 1rem;
    background: var(--primary);
    border: none;
    border-radius: 12px;
    color: white;
    font-size: 1rem;
    font-weight: 700;
    cursor: pointer;
    box-shadow: 0 4px 12px rgba(139, 92, 246, 0.4);
    transition: transform 0.2s, box-shadow 0.2s;
}

.primary-btn:hover {
    background: var(--primary-hover);
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(139, 92, 246, 0.5);
}

/* Improved PAP Result Box */
.action-group-compact {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    margin-top: 1.5rem;
}

.result-box-compact {
    padding: 1.25rem;
    background: rgba(139, 92, 246, 0.15);
    border: 1px solid var(--primary);
    border-radius: 12px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    animation: fadeIn 0.3s ease-out;
}

.result-box-compact.hidden {
    display: none;
}

.result-box-compact .result-label {
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--primary-light);
    margin-bottom: 0.25rem;
}

.result-box-compact .result-value {
    font-size: 1.75rem;
    font-weight: 700;
    color: #fff;
    margin-top: 0;
    text-shadow: 0 2px 10px rgba(139, 92, 246, 0.5);
}


/* Responsive */
@media (max-width: 768px) {
    .converter-grid {
        grid-template-columns: 1fr;
    }

    .exchange-icon {
        transform: rotate(90deg);
        margin: 0 auto;
    }

    .pap-grid {
        grid-template-columns: 1fr;
    }
}