:root {
    --gold: #D4AF37;
    --black: #000000;
    --white-trans: rgba(255, 255, 255, 0.9);
    --bg-gradient: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

body {
    background: var(--bg-gradient);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.app-container {
    width: 100%;
    max-width: 480px; /* Mobile-first width */
    min-height: 100vh;
    background: var(--white-trans);
    box-shadow: 0 0 20px rgba(0,0,0,0.1);
    position: relative;
    display: flex;
    flex-direction: column;
}

/* Header Styling */
header {
    background: var(--black);
    color: var(--gold);
    padding: 15px;
    text-align: center;
    font-weight: bold;
    font-size: 1.2rem;
    position: sticky;
    top: 0;
    z-index: 100;
}

/* Form Styling */
.form-group {
    margin-bottom: 15px;
    padding: 0 20px;
}

.form-group label {
    display: block;
    margin-bottom: 5px;
    color: var(--black);
    font-weight: 600;
}

.form-control {
    width: 100%;
    padding: 12px;
    border: 1px solid #ddd;
    border-radius: 8px;
    outline: none;
}

.btn {
    width: calc(100% - 40px);
    margin: 10px 20px;
    padding: 12px;
    border: none;
    border-radius: 8px;
    font-weight: bold;
    cursor: pointer;
    transition: 0.3s;
}

.btn-primary {
    background: var(--gold);
    color: var(--black);
}

.btn-primary:hover {
    background: #b8962e;
}

/* Navigation Bottom Bar */
.nav-bar {
    position: fixed;
    bottom: 0;
    width: 100%;
    max-width: 480px;
    background: var(--black);
    display: flex;
    justify-content: space-around;
    padding: 10px 0;
    z-index: 100;
}

.nav-item {
    color: var(--white-trans);
    text-decoration: none;
    font-size: 0.8rem;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.nav-item.active {
    color: var(--gold);
}

/* Card Styling */
.card {
    background: white;
    margin: 15px 20px;
    padding: 15px;
    border-radius: 12px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.05);
    border-left: 4px solid var(--gold);
}

/* Animations */
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

.animate-fade {
    animation: fadeIn 0.5s ease-out;
}