:root {
    --primary: #3b82f6;
    --primary-hover: #2563eb;
    --bg: #0f172a;
    --surface: #1e293b;
    --border: #334155;
    --text: #f8fafc;
    --text-muted: #94a3b8;
    --success: #10b981;
    --info: #06b6d4;
    --warning: #f59e0b;
    --radius: 16px;
    --card-shadow: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
}

* {
    -webkit-tap-highlight-color: transparent;
    box-sizing: border-box;
}

body {
    font-family: 'Inter', system-ui, -apple-system, sans-serif;
    background-color: var(--bg);
    color: var(--text);
    margin: 0;
    padding: 0;
    -webkit-font-smoothing: antialiased;
    overflow-x: hidden;
    /* Prevent rubber-banding on iOS if needed, but usually better to let it be */
}

/* App Shell Structure */
.app-shell {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    max-width: 480px;
    margin: 0 auto;
    background: var(--bg);
    position: relative;
}

.app-bar {
    position: sticky;
    top: 0;
    z-index: 1000;
    background: rgba(15, 23, 42, 0.8);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border);
    padding-top: calc(8px + env(safe-area-inset-top));
}

.app-content {
    flex: 1;
    padding-bottom: calc(90px + env(safe-area-inset-bottom)) !important;
}

/* Bottom Navigation */
.bottom-nav {
    position: fixed;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 100%;
    max-width: 480px;
    height: calc(70px + env(safe-area-inset-bottom));
    background: rgba(30, 41, 59, 0.95);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-top: 1px solid var(--border);
    display: flex;
    justify-content: space-around;
    align-items: center;
    padding-bottom: env(safe-area-inset-bottom);
    z-index: 1050;
}

.bottom-nav .nav-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-decoration: none;
    color: var(--text-muted);
    font-size: 0.65rem;
    font-weight: 500;
    transition: all 0.2s;
    flex: 1;
    padding: 8px 0;
}

.bottom-nav .nav-item svg {
    margin-bottom: 4px;
    width: 24px;
    height: 24px;
    transition: transform 0.2s ease;
}

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

.bottom-nav .nav-item.active svg {
    transform: translateY(-2px);
    stroke: var(--primary);
}

/* Cards & Stats */
.card-stat {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 20px;
    margin-bottom: 16px;
    box-shadow: var(--card-shadow);
}

.stat-label {
    font-size: 0.7rem;
    color: var(--text-muted);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.stat-value {
    font-size: 1.75rem;
    font-weight: 700;
    margin: 4px 0;
    color: var(--text);
}

.progress-thin {
    height: 8px;
    background-color: var(--border);
    border-radius: 10px;
    overflow: hidden;
    margin-top: 8px;
}

.progress-bar-inner {
    height: 100%;
    background-color: var(--primary);
    transition: width 0.6s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.btn-primary-custom {
    background-color: var(--primary);
    color: white;
    border: none;
    border-radius: var(--radius);
    padding: 16px 24px;
    font-weight: 700;
    width: 100%;
    box-shadow: 0 4px 12px rgba(59, 130, 246, 0.3);
}

.btn-primary-custom:active {
    transform: scale(0.98);
}

.log-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 16px;
    background: var(--surface);
    border-radius: var(--radius);
    margin-bottom: 10px;
    border: 1px solid var(--border);
}

.modal-content {
    background-color: var(--surface);
    border-radius: 24px;
    border: 1px solid var(--border);
}

.form-control {
    background-color: var(--bg);
    border-radius: 12px;
    border: 1px solid var(--border);
    padding: 14px 16px;
    color: var(--text);
    font-size: 1rem; /* Prevent zoom on iOS */
}

/* Custom Utilities */
.x-small { font-size: 0.75rem; }
.text-info { color: var(--info) !important; }
.text-warning { color: var(--warning) !important; }
.bg-info { background-color: var(--info) !important; }
.bg-warning { background-color: var(--warning) !important; }

#reminders-row::-webkit-scrollbar { display: none; }

/* Supplement buttons */
.supplement-toggle-btn {
    border-radius: 12px !important;
    font-weight: 600 !important;
    padding: 8px 16px !important;
}

/* Gallery adjustments */
#gallery-container .card {
    border-radius: var(--radius);
    overflow: hidden;
    border: 1px solid var(--border);
    background: var(--surface);
}

/* Hide Bootstrap Tab Nav as we use Bottom Nav now */
#mainTab {
    display: none !important;
}

@media (min-width: 481px) {
    body {
        background-color: #000;
    }
    .app-shell {
        box-shadow: 0 0 40px rgba(0,0,0,0.5);
    }
}