/* ==========================================================================
   PU Food Express - Global Styles (Mobile First)
   ========================================================================== */

:root {
    --color-primary: #166534;
    --color-primary-hover: #14532d;
    --color-primary-light: #f0fdf4;
    --color-bg: #f3f4f6;
    --color-white: #ffffff;
    --color-text: #111827;
    --color-muted: #6b7280;
    --color-border: #e5e7eb;
    --color-success: #15803d;
    --color-warning: #b45309;
    --color-danger: #b91c1c;
    
    --radius-md: 12px;
    --radius-sm: 8px;
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.1);
    --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.1);
    --bottom-nav-height: 64px;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background-color: var(--color-bg);
    color: var(--color-text);
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
}

/* Typography */
h1, h2, h3, h4 { color: var(--color-text); font-weight: 600; }
a { text-decoration: none; color: var(--color-primary); }
.text-muted { color: var(--color-muted); font-size: 0.875rem; }
.text-danger { color: var(--color-danger); }

/* App Layout */
.app-header {
    background-color: var(--color-white);
    border-bottom: 1px solid var(--color-border);
    position: sticky;
    top: 0;
    z-index: 40;
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px 16px;
    max-width: 768px;
    margin: 0 auto;
}

.brand { display: flex; align-items: center; gap: 8px; }
.brand-mark {
    background: var(--color-primary);
    color: var(--color-white);
    font-weight: bold;
    padding: 4px 8px;
    border-radius: 6px;
    font-size: 14px;
}
.brand-text { font-weight: 600; font-size: 18px; color: var(--color-primary); }
.header-profile { color: var(--color-text); padding: 4px; }

.app-main {
    max-width: 768px;
    margin: 0 auto;
    padding: 16px;
    padding-bottom: calc(var(--bottom-nav-height) + 24px + env(safe-area-inset-bottom));
    min-height: calc(100vh - 60px);
}

/* Forms & Inputs */
.form-group { margin-bottom: 16px; }
.form-label {
    display: block;
    font-size: 14px;
    font-weight: 500;
    margin-bottom: 6px;
    color: var(--color-text);
}
.form-control {
    width: 100%;
    padding: 12px 16px;
    font-size: 16px;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    background-color: var(--color-white);
    transition: border-color 0.2s;
}
.form-control:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px var(--color-primary-light);
}
.form-text { font-size: 12px; color: var(--color-muted); margin-top: 4px; }

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 12px 24px;
    font-size: 16px;
    font-weight: 600;
    border-radius: var(--radius-md);
    border: none;
    cursor: pointer;
    width: 100%;
    transition: background-color 0.2s;
}
.btn-primary {
    background-color: var(--color-primary);
    color: var(--color-white);
}
.btn-primary:hover { background-color: var(--color-primary-hover); }
.btn-outline {
    background-color: transparent;
    color: var(--color-primary);
    border: 1px solid var(--color-primary);
}
.btn-danger { background-color: var(--color-danger); color: var(--color-white); }

/* Cards */
.card {
    background-color: var(--color-white);
    border-radius: var(--radius-md);
    border: 1px solid var(--color-border);
    padding: 20px;
    box-shadow: var(--shadow-sm);
    margin-bottom: 16px;
}

/* Flash Messages */
.flash-stack { margin-bottom: 16px; }
.flash {
    padding: 12px 16px;
    border-radius: var(--radius-md);
    font-size: 14px;
    font-weight: 500;
    margin-bottom: 8px;
}
.flash-success { background: #dcfce7; color: var(--color-success); border: 1px solid #bbf7d0; }
.flash-danger  { background: #fee2e2; color: var(--color-danger); border: 1px solid #fecaca; }
.flash-warning { background: #fef3c7; color: var(--color-warning); border: 1px solid #fde68a; }
.flash-info    { background: #e0f2fe; color: #0369a1; border: 1px solid #bae6fd; }

/* Bottom Navigation */
.bottom-nav {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    height: var(--bottom-nav-height);
    background-color: var(--color-white);
    border-top: 1px solid var(--color-border);
    display: flex;
    justify-content: space-around;
    align-items: center;
    padding-bottom: env(safe-area-inset-bottom);
    z-index: 50;
}
.nav-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    color: var(--color-muted);
    font-size: 10px;
    font-weight: 500;
    gap: 4px;
    width: 100%;
    height: 100%;
}
.nav-item i { width: 24px; height: 24px; }
.nav-item.active { color: var(--color-primary); }
.nav-item:active { background-color: var(--color-primary-light); }