/* --- 1. SETUP VARIABLES (THEMING) --- */
:root {
    /* Font */
    --font-main: 'Plus Jakarta Sans', sans-serif;

    /* Light Mode Colors (Default) */
    --bg-app: #f8fafc;
    --bg-card: #ffffff;
    --text-primary: #0f172a;
    --text-secondary: #64748b;
    --border-color: #e2e8f0;
    --primary: #4f46e5;
    --primary-hover: #4338ca;
    --primary-light: #eef2ff;
    --input-bg: #ffffff;
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.05), 0 2px 4px -1px rgba(0, 0, 0, 0.03);
    --upload-bg: #f8fafc;
    --upload-border: #cbd5e1;
}

/* Dark Mode Overrides */
[data-theme="dark"] {
    --bg-app: #0f172a;
    --bg-card: #1e293b;
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --border-color: #334155;
    --primary: #6366f1;
    --primary-hover: #818cf8;
    --primary-light: rgba(99, 102, 241, 0.1);
    --input-bg: #0f172a;
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.3);
    --upload-bg: #0f172a;
    --upload-border: #475569;
}

/* --- 2. GLOBAL RESET --- */
* { box-sizing: border-box; margin: 0; padding: 0; transition: background-color 0.3s ease, border-color 0.3s ease, color 0.3s ease; }

body {
    font-family: var(--font-main);
    background-color: var(--bg-app);
    color: var(--text-primary);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* --- 3. NAVBAR & BUTTON TOGGLE --- */
.navbar {
    display: flex; justify-content: space-between; align-items: center;
    padding: 1rem 2rem; background: var(--bg-card);
    border-bottom: 1px solid var(--border-color);
}
.nav-brand { display: flex; align-items: center; gap: 10px; font-weight: 700; font-size: 1.2rem; }
.logo-icon { color: var(--primary); }

.theme-btn {
    background: var(--input-bg); border: 1px solid var(--border-color);
    color: var(--text-primary); width: 40px; height: 40px;
    border-radius: 10px; cursor: pointer; display: flex; align-items: center; justify-content: center;
    font-size: 1.1rem;
}
.theme-btn:hover { border-color: var(--primary); color: var(--primary); }

/* --- 4. LAYOUT GRID --- */
.main-container {
    max-width: 1200px; width: 100%; margin: 0 auto;
    padding: 2rem; flex: 1; display: flex; flex-direction: column;
}

.grid-layout {
    display: grid; grid-template-columns: 1fr 1fr; gap: 2rem; flex: 1;
}

/* --- 5. CARD STYLING --- */
.card {
    background: var(--bg-card); border-radius: 20px;
    box-shadow: var(--shadow); border: 1px solid var(--border-color);
    display: flex; flex-direction: column; overflow: hidden;
}
.card-header { padding: 1.5rem; border-bottom: 1px solid var(--border-color); }
.card-header h2 { font-size: 1.25rem; font-weight: 700; margin-bottom: 0.25rem; }
.card-header p { font-size: 0.875rem; color: var(--text-secondary); }
.card-body { padding: 1.5rem; flex: 1; display: flex; flex-direction: column; gap: 1.25rem; }

/* --- 6. FORM ELEMENTS --- */
.tabs-container {
    display: flex; 
    background: var(--bg-app);
    padding: 4px;
    border-radius: 12px; 
    gap: 1px; 
    margin-bottom: 20px;
    border: 1px solid var(--border-color);
}
.tab-btn {
    flex: 1; 
    border: none; 
    background: transparent; 
    padding: 12px;
    font-weight: 600; 
    color: var(--text-secondary); 
    cursor: pointer;
    border-radius: 8px; 
    font-size: 0.95rem;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
}
.tab-btn.active { 
    background: var(--bg-card); 
    color: var(--primary);      
    box-shadow: 0 2px 5px rgba(0,0,0,0.08); 
    border: 1px solid var(--border-color);
}
.tab-btn:not(.active):hover {
    background: rgba(0,0,0,0.03);
    color: var(--text-primary);
}

.input-label { display: block; font-size: 0.9rem; font-weight: 600; margin-bottom: 8px; color: var(--text-primary); }
.form-input, .form-select {
    width: 100%; padding: 12px 16px; border-radius: 10px;
    border: 1px solid var(--border-color); background: var(--input-bg);
    color: var(--text-primary); font-size: 1rem; outline: none;
}
.form-input:focus, .form-select:focus { border-color: var(--primary); box-shadow: 0 0 0 3px var(--primary-light); }

.input-wrapper { position: relative; }
.prefix {
    position: absolute; left: 16px; top: 50%; transform: translateY(-50%);
    color: var(--text-secondary); font-weight: 600;
}
.input-wrapper input { padding-left: 45px; }

/* Upload Zone */
.upload-zone {
    border: 2px dashed var(--upload-border); background: var(--upload-bg);
    border-radius: 12px; padding: 2rem; text-align: center; cursor: pointer;
    transition: 0.2s; display: block;
}
.upload-zone:hover { border-color: var(--primary); background: var(--primary-light); }
.upload-content { display: flex; flex-direction: column; gap: 8px; color: var(--text-secondary); }
.status-pill {
    background: #dcfce7; color: #166534; padding: 6px 12px;
    border-radius: 20px; font-size: 0.8rem; font-weight: 700;
    display: inline-flex; align-items: center; gap: 5px; margin-top: 10px;
}
input[type="file"] { display: none; }

/* Fee Grid */
.fee-grid { display: grid; grid-template-columns: 120px 1fr; gap: 10px; }
.badge-optional {
    background: var(--bg-app); color: var(--text-secondary);
    font-size: 0.7rem; padding: 2px 6px; border-radius: 4px; margin-left: 5px;
}

/* Primary Button */
.btn-primary {
    background: var(--primary); color: white; border: none;
    padding: 14px; border-radius: 10px; font-weight: 700; font-size: 1rem;
    cursor: pointer; margin-top: auto;
}
.btn-primary:hover { background: var(--primary-hover); transform: translateY(-1px); }

.btn-secondary {
    background: transparent; color: var(--text-primary); border: 1px solid var(--border-color);
    padding: 10px 14px; border-radius: 10px; font-weight: 600; font-size: 0.9rem;
    cursor: pointer;
}
.btn-secondary:hover { background: var(--bg-app); border-color: var(--primary); color: var(--primary); }
.btn-danger {
    background: transparent; color: #ef4444; border: 1px solid #fecaca;
    padding: 8px 12px; border-radius: 8px; font-weight: 600; font-size: 0.85rem;
    cursor: pointer;
}
.btn-danger:hover { background: #fee2e2; border-color: #ef4444; }

/* --- 7. OUTPUT STYLING --- */
.result-body { justify-content: center; align-items: center; text-align: center; }

.empty-state { color: var(--text-secondary); }
.empty-icon {
    font-size: 4rem; opacity: 0.2; margin-bottom: 1rem;
}

.icon-xs { font-size: 0.8rem; display: inline-block; vertical-align: middle; }
.icon-sm { font-size: 1rem; display: inline-block; vertical-align: middle; }
.icon-lg { font-size: 2rem; display: inline-block; vertical-align: middle; }
.icon-xl { font-size: 4rem; display: inline-block; vertical-align: middle; }

[data-icon] { display: inline-flex; align-items: center; justify-content: center; }

.qr-wrapper {
    background: white; 
    padding: 20px;
    border-radius: 16px;
    border: 1px solid var(--border-color); 
    display: inline-block;
    margin-bottom: 1.5rem;
    box-shadow: var(--shadow);
}
#qr-container img { max-width: 100%; height: auto !important; }

.nominal-display { font-size: 1.8rem; font-weight: 800; color: var(--text-primary); margin-bottom: 5px; }
.valid-text { color: #10b981; font-weight: 600; font-size: 0.9rem; margin-bottom: 2rem; }

.action-grid { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 10px; width: 100%; }
.btn-outline {
    background: transparent; border: 1px solid var(--border-color);
    color: var(--text-primary); padding: 12px; border-radius: 8px;
    font-weight: 600; cursor: pointer; display: flex; align-items: center; justify-content: center; gap: 8px;
}
.btn-outline:hover { background: var(--bg-app); border-color: var(--text-secondary); }

/* Saved Items List */
.saved-list {
    display: flex; flex-direction: column; gap: 10px; max-height: 250px; overflow-y: auto; margin-top: 15px; padding-right: 5px;
}
.saved-item {
    display: flex; justify-content: space-between; align-items: center;
    background: var(--bg-app); padding: 12px 15px; border-radius: 10px;
    border: 1px solid var(--border-color);
}
.saved-item-info { display: flex; flex-direction: column; text-align: left;}
.saved-item-name { font-weight: 700; font-size: 0.95rem; color: var(--text-primary); }
.saved-item-qris { font-size: 0.8rem; color: var(--text-secondary); margin-top: 2px;}
.saved-item-actions { display: flex; gap: 8px; }

/* Footer */
.footer { text-align: center; padding-top: 2rem; color: var(--text-secondary); font-size: 0.9rem; }
.footer a { color: var(--primary); text-decoration: none; font-weight: 600; }

.hidden { display: none !important; }

/* --- MODAL FULLSCREEN PREVIEW --- */
.modal {
    position: fixed; top: 0; left: 0; width: 100%; height: 100%;
    background: rgba(0,0,0,0.9); z-index: 2000;
    display: flex; align-items: center; justify-content: center;
}
.modal.hidden { display: none !important; }
.modal-content { position: relative; max-width: 95%; max-height: 95%; display: flex; justify-content: center; align-items: center; }
.modal-content img { max-width: 100%; max-height: 90vh; border-radius: 12px; }
.close-btn { position: absolute; top: -40px; right: 0; background: transparent; border: none; color: white; font-size: 2.5rem; cursor: pointer; }

/* --- RESPONSIVE --- */
@media (max-width: 850px) {
    .grid-layout { grid-template-columns: 1fr; }
}
@media (max-width: 500px) {
    .action-grid { grid-template-columns: 1fr; }
}