:root {
    --bg-color: #f4f6f8;
    --card-bg: #ffffff;
    --text-color: #333333;
    --text-muted: #666666;
    --primary-color: #d70f64; /* Official Foodpanda Pink */
    --input-border: #e2e8f0;
    --input-focus: #ffcbd1;
    --result-bg: #f8f9fa;
    --remit-bg: #fff0f5;
    --card-shadow: 0 10px 30px rgba(215, 15, 100, 0.05);
    --footer-text: #888888;
}

[data-theme="dark"] {
    --bg-color: #0f0f11;
    --card-bg: #18181c;
    --text-color: #f3f4f6;
    --text-muted: #9ca3af;
    --input-border: #2d2d34;
    --input-focus: #4c172c;
    --result-bg: #202024;
    --remit-bg: #2d121e;
    --card-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
    --footer-text: #555555;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
    transition: background-color 0.25s ease, color 0.25s ease, border-color 0.25s ease;
}

body {
    background-color: var(--bg-color);
    color: var(--text-color);
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    padding: 20px;
}

.app-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 20px;
    width: 100%;
    max-width: 440px;
}

/* Install Button CSS */
.install-btn {
    width: 100%;
    background-color: var(--primary-color);
    color: white;
    border: none;
    padding: 14px;
    border-radius: 14px;
    font-size: 1rem;
    font-weight: 700;
    cursor: pointer;
    box-shadow: 0 4px 12px rgba(215, 15, 100, 0.2);
    margin-bottom: 5px;
    text-align: center;
    outline: none;
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0% { transform: scale(1); }
    50% { transform: scale(1.02); }
    100% { transform: scale(1); }
}

.calculator-card {
    background-color: var(--card-bg);
    border-radius: 24px;
    box-shadow: var(--card-shadow);
    width: 100%;
    padding: 32px;
    border: 1px solid rgba(215, 15, 100, 0.08);
}

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

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

.panda-logo {
    width: 46px;
    height: 46px;
    object-fit: cover;
    border-radius: 12px;
}

.title-text h1 {
    font-size: 1.4rem;
    color: var(--primary-color);
    font-weight: 800;
    letter-spacing: -0.5px;
}

.subtitle {
    font-size: 0.8rem;
    color: var(--text-muted);
    font-weight: 500;
}

.divider {
    border: 0;
    height: 1px;
    background: var(--input-border);
    margin: 24px 0;
}

/* Toggle Switch CSS */
.theme-switch {
    display: inline-block;
    height: 28px;
    position: relative;
    width: 54px;
}

.theme-switch input { display: none; }

.slider {
    background-color: #e2e8f0;
    border-radius: 34px;
    bottom: 0;
    cursor: pointer;
    left: 0;
    position: absolute;
    right: 0;
    top: 0;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 6px;
}

[data-theme="dark"] .slider { background-color: #2d2d34; }

.slider:before {
    background-color: white;
    border-radius: 50%;
    bottom: 3px;
    content: "";
    height: 22px;
    left: 3px;
    position: absolute;
    transition: transform 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    width: 22px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    z-index: 2;
}

input:checked + .slider:before { transform: translateX(26px); }
.mode-icon { font-size: 0.85rem; z-index: 1; user-select: none; }

/* Input Elements */
.input-group { margin-bottom: 20px; }
label { display: block; margin-bottom: 8px; font-size: 0.9rem; font-weight: 600; }
.label-desc { font-size: 0.75rem; color: var(--text-muted); font-weight: 400; }
.input-wrapper { position: relative; }
.currency-symbol { position: absolute; left: 16px; top: 50%; transform: translateY(-50%); font-weight: 600; color: var(--text-muted); }

input[type="number"] {
    width: 100%;
    padding: 14px 16px 14px 36px;
    border: 2px solid var(--input-border);
    border-radius: 12px;
    background-color: var(--card-bg);
    color: var(--text-color);
    font-size: 1.05rem;
    font-weight: 500;
    outline: none;
}
input[type="number"]:focus { border-color: var(--primary-color); box-shadow: 0 0 0 4px var(--input-focus); }

/* Output Panels */
.results-panel { background-color: var(--result-bg); border-radius: 16px; padding: 20px; margin-top: 24px; }
.result-row { display: flex; justify-content: space-between; align-items: center; margin-bottom: 14px; font-size: 0.9rem; font-weight: 500; }
.result-label { color: var(--text-muted); }
.result-val { font-weight: 600; }
.text-danger { color: #eb5757; }
.text-success { color: #27ae60; }

.remit-box {
    background-color: var(--remit-bg);
    border-radius: 12px;
    padding: 16px;
    margin-top: 18px;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
    border: 1px dashed rgba(215, 15, 100, 0.2);
}
.remit-label { font-size: 0.75rem; font-weight: 700; color: var(--primary-color); letter-spacing: 0.5px; }
.remit-val { font-size: 1.6rem; font-weight: 800; color: var(--primary-color); }

/* Footer */
.app-footer { width: 100%; text-align: center; font-size: 0.75rem; color: var(--footer-text); padding: 10px 0; letter-spacing: 0.2px; }
.app-footer strong { color: var(--primary-color); }