:root {
    --p-dark: #003B73;
    --p-deep: #0074B7;
    --p-med: #60A3D9;
    --accent: #FFC107;
    --bg: #F5F8FC;
    --card: #FFFFFF;
    --text: #1C2B3A;
    --muted: #6C7D8E;
    --shadow: 0 10px 30px rgba(0, 59, 115, 0.08);
}

.dark-mode {
    --bg: #0C1A2B;
    --card: #18283C;
    --text: #E2E8F0;
    --muted: #A0AEC0;
}

* { margin: 0; padding: 0; box-sizing: border-box; font-family: 'Inter', sans-serif; }
body { background: var(--bg); color: var(--text); padding-bottom: 100px; transition: background 0.3s; }

/* Header & Info */
.main-header { background: var(--p-dark); padding: 30px 20px 100px; position: relative; }
.header-content { display: flex; justify-content: space-between; align-items: center; color: white; }
.header-info { display: flex; flex-direction: column; }
.info-text { font-size: 0.7rem; opacity: 0.7; font-weight: 500; text-transform: uppercase; letter-spacing: 0.5px; }
.info-row { display: flex; align-items: center; gap: 12px; margin-top: 2px; }
.info-time { font-size: 1.3rem; font-weight: 800; }
.info-weather { font-size: 0.8rem; background: rgba(255,255,255,0.2); padding: 3px 10px; border-radius: 10px; font-weight: 600; }

.header-btn { background: rgba(255,255,255,0.15); border: none; color: white; width: 42px; height: 42px; border-radius: 14px; cursor: pointer; }

/* Search Box */
.curve-container { position: absolute; bottom: 0; left: 0; width: 100%; line-height: 0; }
.curve { width: 100%; height: auto; }
.search-box { 
    position: absolute; bottom: -28px; left: 20px; right: 20px; 
    background: var(--card); height: 60px; border-radius: 18px; 
    display: flex; align-items: center; padding: 0 20px; box-shadow: 0 12px 30px rgba(0,0,0,0.1);
}
.search-icon { color: var(--p-deep); margin-right: 15px; font-size: 1.2rem; }
.search-box input { border: none; width: 100%; outline: none; background: transparent; color: var(--text); font-size: 1rem; font-weight: 500; }

/* Welcome Section */
.welcome-section { text-align: center; padding: 80px 40px; }
.welcome-icon { font-size: 4rem; color: var(--p-dark); opacity: 0.1; margin-bottom: 15px; }
.welcome-section h2 { font-size: 1.4rem; font-weight: 800; margin-bottom: 8px; }
.welcome-section p { font-size: 0.9rem; color: var(--muted); line-height: 1.5; }

/* Grid & Cards */
.app-body { padding-top: 50px; }
.product-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 15px; padding: 0 20px; }
.product-card { background: var(--card); border-radius: 22px; padding: 18px; box-shadow: var(--shadow); border: 1px solid rgba(0,0,0,0.02); }
.po-name { font-size: 0.7rem; font-weight: 800; color: var(--p-deep); text-transform: uppercase; display: block; margin-bottom: 4px; }
.dest-name { font-size: 1.1rem; font-weight: 700; margin-bottom: 12px; }
.time-tag { font-size: 0.9rem; font-weight: 600; display: flex; align-items: center; gap: 6px; color: var(--text); }
.price-tag { font-size: 1rem; font-weight: 800; color: var(--p-dark); margin-top: 10px; display: block; }

.buy-btn { width: 100%; background: var(--bg); color: var(--p-dark); border: 1px solid var(--p-light); padding: 12px; border-radius: 14px; font-weight: 700; margin-top: 15px; cursor: pointer; transition: 0.2s; font-size: 0.8rem; }
.buy-btn:active { transform: scale(0.95); }

/* Modal */
.modal { display: none; position: fixed; top:0; left:0; width:100%; height:100%; background:rgba(0,0,0,0.8); z-index:2000; padding:20px; align-items: center; justify-content: center; backdrop-filter: blur(5px); }
.modal-content { background: var(--card); padding: 25px; border-radius: 28px; width: 100%; max-width: 400px; position: relative; }
.close-modal { position: absolute; top: 15px; right: 15px; border: none; background: none; font-size: 1.8rem; color: var(--text); cursor: pointer; }

/* Bottom Nav */
.bottom-nav { position: fixed; bottom: 0; width: 100%; height: 75px; background: var(--card); display: flex; justify-content: space-around; align-items: center; border-top: 1px solid rgba(0,0,0,0.05); z-index: 1000; box-shadow: 0 -5px 20px rgba(0,0,0,0.03); }
.nav-item { text-decoration: none; color: var(--muted); display: flex; flex-direction: column; align-items: center; flex: 1; }
.nav-item.active { color: var(--p-dark); }
.nav-item i { font-size: 1.2rem; margin-bottom: 4px; }
.nav-item span { font-size: 0.65rem; font-weight: 700; text-transform: uppercase; }

@media (min-width: 768px) { .product-grid { grid-template-columns: repeat(3, 1fr); } }