/* ===================================
   DealTender Mobile Native App Styles
   Mobile-First Responsive Design
   =================================== */

/* CSS Variables for Theming */
:root {
    /* Colors - Light Mode */
    --primary-color: #007AFF;
    --primary-dark: #0056b3;
    --primary-light: #4DA6FF;
    --secondary-color: #FF9500;
    --accent-color: #FF3B30;
    --success-color: #34C759;
    --warning-color: #FF9500;
    --danger-color: #FF3B30;

    /* Backgrounds */
    --bg-primary: #FFFFFF;
    --bg-secondary: #F2F2F7;
    --bg-tertiary: #E5E5EA;
    --bg-modal: rgba(0, 0, 0, 0.5);

    /* Text Colors */
    --text-primary: #000000;
    --text-secondary: #3C3C43;
    --text-tertiary: #8E8E93;
    --text-inverse: #FFFFFF;

    /* Borders */
    --border-color: #C6C6C8;
    --divider-color: #E5E5EA;

    /* Shadows */
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.15);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.2);
    --shadow-card: 0 2px 8px rgba(0, 0, 0, 0.08);

    /* Spacing */
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;

    /* Typography */
    --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Helvetica Neue', Arial, sans-serif;
    --font-size-xs: 12px;
    --font-size-sm: 14px;
    --font-size-base: 16px;
    --font-size-lg: 18px;
    --font-size-xl: 20px;
    --font-size-2xl: 24px;
    --font-size-3xl: 30px;

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 250ms ease;
    --transition-slow: 350ms ease;

    /* Border Radius */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 20px;
    --radius-full: 9999px;

    /* Z-Index Layers */
    --z-dropdown: 1000;
    --z-sticky: 1020;
    --z-fixed: 1030;
    --z-modal-backdrop: 1040;
    --z-modal: 1050;
    --z-toast: 1060;

    /* Touch Targets */
    --touch-target: 48px;

    /* Safe Areas for iOS */
    --safe-area-top: env(safe-area-inset-top);
    --safe-area-bottom: env(safe-area-inset-bottom);
    --safe-area-left: env(safe-area-inset-left);
    --safe-area-right: env(safe-area-inset-right);
}

/* Dark Mode */
@media (prefers-color-scheme: dark) {
    :root {
        --bg-primary: #000000;
        --bg-secondary: #1C1C1E;
        --bg-tertiary: #2C2C2E;
        --text-primary: #FFFFFF;
        --text-secondary: #EBEBF5;
        --text-tertiary: #8E8E93;
        --border-color: #38383A;
        --divider-color: #38383A;
    }
}

/* Manual Dark Mode Toggle */
body.dark-mode {
    --bg-primary: #000000;
    --bg-secondary: #1C1C1E;
    --bg-tertiary: #2C2C2E;
    --text-primary: #FFFFFF;
    --text-secondary: #EBEBF5;
    --text-tertiary: #8E8E93;
    --border-color: #38383A;
    --divider-color: #38383A;
}

/* ===================================
   Reset & Base Styles
   =================================== */

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    -webkit-tap-highlight-color: transparent;
}

html {
    font-size: 16px;
    -webkit-text-size-adjust: 100%;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    line-height: 1.5;
    color: var(--text-primary);
    background-color: var(--bg-secondary);
    overflow-x: hidden;
    min-height: 100vh;
    padding-bottom: calc(60px + var(--safe-area-bottom)); /* Space for bottom nav */
}

/* ===================================
   Typography
   =================================== */

h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: 1.2;
    margin-bottom: var(--spacing-md);
}

h1 { font-size: var(--font-size-3xl); }
h2 { font-size: var(--font-size-2xl); }
h3 { font-size: var(--font-size-xl); }
h4 { font-size: var(--font-size-lg); }
h5 { font-size: var(--font-size-base); }
h6 { font-size: var(--font-size-sm); }

p {
    margin-bottom: var(--spacing-md);
}

a {
    color: var(--primary-color);
    text-decoration: none;
    transition: color var(--transition-fast);
}

a:active {
    opacity: 0.7;
}

/* ===================================
   Header & Navigation
   =================================== */

.app-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: calc(56px + var(--safe-area-top));
    background: var(--bg-primary);
    border-bottom: 1px solid var(--divider-color);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--safe-area-top) var(--spacing-md) 0;
    z-index: var(--z-sticky);
    box-shadow: var(--shadow-sm);
}

.header-title {
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--text-primary);
    flex: 1;
    text-align: center;
}

/* Hamburger Menu Button */
.hamburger-btn {
    width: 40px;
    height: 40px;
    background: transparent;
    border: none;
    cursor: pointer;
    padding: 8px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 5px;
    position: relative;
    z-index: var(--z-modal);
}

.hamburger-btn span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--text-primary);
    transition: all var(--transition-base);
    border-radius: 2px;
}

.hamburger-btn.active span:nth-child(1) {
    transform: rotate(45deg) translate(6px, 6px);
}

.hamburger-btn.active span:nth-child(2) {
    opacity: 0;
}

.hamburger-btn.active span:nth-child(3) {
    transform: rotate(-45deg) translate(6px, -6px);
}

/* Mobile Menu Overlay */
.mobile-menu {
    position: fixed;
    top: 0;
    left: -100%;
    width: 80%;
    max-width: 320px;
    height: 100vh;
    background: var(--bg-primary);
    z-index: var(--z-fixed);
    transition: left var(--transition-base);
    overflow-y: auto;
    padding: calc(var(--safe-area-top) + 60px) var(--spacing-md) var(--spacing-lg);
    box-shadow: var(--shadow-lg);
}

.mobile-menu.active {
    left: 0;
}

.menu-backdrop {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--bg-modal);
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-base);
    z-index: var(--z-modal-backdrop);
}

.menu-backdrop.active {
    opacity: 1;
    visibility: visible;
}

.mobile-menu nav ul {
    list-style: none;
}

.mobile-menu nav ul li {
    margin-bottom: var(--spacing-sm);
}

.mobile-menu nav ul li a {
    display: flex;
    align-items: center;
    padding: var(--spacing-md);
    color: var(--text-primary);
    font-size: var(--font-size-base);
    font-weight: 500;
    border-radius: var(--radius-md);
    transition: background var(--transition-fast);
}

.mobile-menu nav ul li a:active {
    background: var(--bg-secondary);
}

/* Desktop Navigation (hidden on mobile) */
.desktop-nav {
    display: none;
}

/* ===================================
   Bottom Navigation Bar (Mobile)
   =================================== */

.bottom-nav {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    height: calc(60px + var(--safe-area-bottom));
    background: var(--bg-primary);
    border-top: 1px solid var(--divider-color);
    display: flex;
    justify-content: space-around;
    align-items: flex-start;
    padding: var(--spacing-sm) 0 var(--safe-area-bottom);
    z-index: var(--z-sticky);
    box-shadow: 0 -2px 8px rgba(0, 0, 0, 0.08);
}

.bottom-nav-item {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 4px;
    padding: var(--spacing-xs);
    color: var(--text-tertiary);
    font-size: var(--font-size-xs);
    font-weight: 500;
    text-decoration: none;
    transition: color var(--transition-fast);
    min-height: var(--touch-target);
}

.bottom-nav-item:active {
    opacity: 0.6;
}

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

.bottom-nav-item svg,
.bottom-nav-item .icon {
    width: 24px;
    height: 24px;
}

/* ===================================
   Main Content Area
   =================================== */

.app-content {
    margin-top: calc(56px + var(--safe-area-top));
    padding: var(--spacing-md);
    min-height: calc(100vh - 56px - 60px - var(--safe-area-top) - var(--safe-area-bottom));
}

/* ===================================
   Cards & Containers
   =================================== */

.card {
    background: var(--bg-primary);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    margin-bottom: var(--spacing-md);
    box-shadow: var(--shadow-card);
    transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.card:active {
    transform: scale(0.98);
}

.card-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--spacing-md);
}

.card-title {
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--text-primary);
}

.card-body {
    color: var(--text-secondary);
}

.card-footer {
    margin-top: var(--spacing-md);
    padding-top: var(--spacing-md);
    border-top: 1px solid var(--divider-color);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

/* ===================================
   Buttons
   =================================== */

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: 12px 24px;
    font-size: var(--font-size-base);
    font-weight: 600;
    border: none;
    border-radius: var(--radius-full);
    cursor: pointer;
    transition: all var(--transition-fast);
    min-height: var(--touch-target);
    text-decoration: none;
    white-space: nowrap;
}

.btn:active {
    transform: scale(0.95);
}

.btn-primary {
    background: var(--primary-color);
    color: var(--text-inverse);
}

.btn-primary:active {
    background: var(--primary-dark);
}

.btn-secondary {
    background: var(--bg-tertiary);
    color: var(--text-primary);
}

.btn-secondary:active {
    background: var(--border-color);
}

.btn-success {
    background: var(--success-color);
    color: var(--text-inverse);
}

.btn-danger {
    background: var(--danger-color);
    color: var(--text-inverse);
}

.btn-outline {
    background: transparent;
    border: 2px solid var(--primary-color);
    color: var(--primary-color);
}

.btn-outline:active {
    background: var(--primary-color);
    color: var(--text-inverse);
}

.btn-block {
    width: 100%;
    display: flex;
}

.btn-sm {
    padding: 8px 16px;
    font-size: var(--font-size-sm);
    min-height: 36px;
}

.btn-lg {
    padding: 16px 32px;
    font-size: var(--font-size-lg);
    min-height: 56px;
}

/* Icon Buttons */
.btn-icon {
    width: var(--touch-target);
    height: var(--touch-target);
    padding: 0;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
}

/* ===================================
   Forms
   =================================== */

.form-group {
    margin-bottom: var(--spacing-md);
}

.form-label {
    display: block;
    margin-bottom: var(--spacing-sm);
    font-size: var(--font-size-sm);
    font-weight: 600;
    color: var(--text-secondary);
}

.form-control {
    width: 100%;
    padding: 12px 16px;
    font-size: var(--font-size-base);
    font-family: var(--font-family);
    color: var(--text-primary);
    background: var(--bg-primary);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    transition: border-color var(--transition-fast);
    min-height: var(--touch-target);
}

.form-control:focus {
    outline: none;
    border-color: var(--primary-color);
}

.form-control::placeholder {
    color: var(--text-tertiary);
}

textarea.form-control {
    resize: vertical;
    min-height: 120px;
}

select.form-control {
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%238E8E93' d='M6 9L1 4h10z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 16px center;
    padding-right: 40px;
}

.form-help {
    font-size: var(--font-size-xs);
    color: var(--text-tertiary);
    margin-top: var(--spacing-xs);
}

.form-error {
    font-size: var(--font-size-xs);
    color: var(--danger-color);
    margin-top: var(--spacing-xs);
}

/* ===================================
   Lists
   =================================== */

.list-group {
    background: var(--bg-primary);
    border-radius: var(--radius-md);
    overflow: hidden;
    margin-bottom: var(--spacing-md);
}

.list-item {
    display: flex;
    align-items: center;
    padding: var(--spacing-md);
    border-bottom: 1px solid var(--divider-color);
    transition: background var(--transition-fast);
    min-height: var(--touch-target);
}

.list-item:last-child {
    border-bottom: none;
}

.list-item:active {
    background: var(--bg-secondary);
}

.list-item-content {
    flex: 1;
}

.list-item-title {
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 4px;
}

.list-item-subtitle {
    font-size: var(--font-size-sm);
    color: var(--text-tertiary);
}

.list-item-action {
    margin-left: var(--spacing-md);
}

/* ===================================
   Badges & Labels
   =================================== */

.badge {
    display: inline-flex;
    align-items: center;
    padding: 4px 12px;
    font-size: var(--font-size-xs);
    font-weight: 600;
    border-radius: var(--radius-full);
    white-space: nowrap;
}

.badge-primary {
    background: var(--primary-light);
    color: var(--primary-dark);
}

.badge-success {
    background: rgba(52, 199, 89, 0.15);
    color: var(--success-color);
}

.badge-warning {
    background: rgba(255, 149, 0, 0.15);
    color: var(--warning-color);
}

.badge-danger {
    background: rgba(255, 59, 48, 0.15);
    color: var(--danger-color);
}

/* ===================================
   Loading States
   =================================== */

.loading-spinner {
    display: inline-block;
    width: 40px;
    height: 40px;
    border: 4px solid var(--bg-tertiary);
    border-top-color: var(--primary-color);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

.skeleton {
    background: linear-gradient(
        90deg,
        var(--bg-tertiary) 25%,
        var(--bg-secondary) 50%,
        var(--bg-tertiary) 75%
    );
    background-size: 200% 100%;
    animation: loading 1.5s ease-in-out infinite;
    border-radius: var(--radius-sm);
}

@keyframes loading {
    0% { background-position: 200% 0; }
    100% { background-position: -200% 0; }
}

/* ===================================
   Pull to Refresh
   =================================== */

.pull-to-refresh {
    position: fixed;
    top: calc(56px + var(--safe-area-top));
    left: 50%;
    transform: translateX(-50%) translateY(-60px);
    transition: transform var(--transition-base);
    z-index: var(--z-sticky);
    opacity: 0;
    pointer-events: none;
}

.pull-to-refresh.active {
    transform: translateX(-50%) translateY(10px);
    opacity: 1;
}

/* ===================================
   Modals & Overlays
   =================================== */

.modal-backdrop {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--bg-modal);
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-base);
    z-index: var(--z-modal-backdrop);
}

.modal-backdrop.active {
    opacity: 1;
    visibility: visible;
}

.modal {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background: var(--bg-primary);
    border-radius: var(--radius-lg) var(--radius-lg) 0 0;
    padding: var(--spacing-lg);
    padding-bottom: calc(var(--spacing-lg) + var(--safe-area-bottom));
    transform: translateY(100%);
    transition: transform var(--transition-base);
    z-index: var(--z-modal);
    max-height: 90vh;
    overflow-y: auto;
}

.modal.active {
    transform: translateY(0);
}

.modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--spacing-lg);
    padding-bottom: var(--spacing-md);
    border-bottom: 1px solid var(--divider-color);
}

.modal-title {
    font-size: var(--font-size-xl);
    font-weight: 600;
}

.modal-close {
    width: 32px;
    height: 32px;
    border: none;
    background: transparent;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-tertiary);
    font-size: 24px;
}

/* ===================================
   Tabs
   =================================== */

.tabs {
    display: flex;
    background: var(--bg-secondary);
    border-radius: var(--radius-md);
    padding: 4px;
    margin-bottom: var(--spacing-md);
}

.tab {
    flex: 1;
    padding: var(--spacing-sm) var(--spacing-md);
    border: none;
    background: transparent;
    color: var(--text-secondary);
    font-size: var(--font-size-sm);
    font-weight: 600;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.tab.active {
    background: var(--bg-primary);
    color: var(--primary-color);
    box-shadow: var(--shadow-sm);
}

/* ===================================
   Toast Notifications
   =================================== */

.toast {
    position: fixed;
    top: calc(var(--safe-area-top) + 70px);
    left: var(--spacing-md);
    right: var(--spacing-md);
    background: var(--text-primary);
    color: var(--text-inverse);
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    transform: translateY(-100px);
    opacity: 0;
    transition: all var(--transition-base);
    z-index: var(--z-toast);
}

.toast.active {
    transform: translateY(0);
    opacity: 1;
}

/* ===================================
   Grid System
   =================================== */

.grid {
    display: grid;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-md);
}

.grid-cols-2 {
    grid-template-columns: repeat(2, 1fr);
}

.grid-cols-3 {
    grid-template-columns: repeat(3, 1fr);
}

/* ===================================
   Utility Classes
   =================================== */

.text-center { text-align: center; }
.text-right { text-align: right; }
.text-left { text-align: left; }

.font-bold { font-weight: 700; }
.font-semibold { font-weight: 600; }
.font-medium { font-weight: 500; }

.text-primary { color: var(--text-primary); }
.text-secondary { color: var(--text-secondary); }
.text-tertiary { color: var(--text-tertiary); }
.text-success { color: var(--success-color); }
.text-danger { color: var(--danger-color); }

.mt-0 { margin-top: 0; }
.mt-1 { margin-top: var(--spacing-xs); }
.mt-2 { margin-top: var(--spacing-sm); }
.mt-3 { margin-top: var(--spacing-md); }
.mt-4 { margin-top: var(--spacing-lg); }

.mb-0 { margin-bottom: 0; }
.mb-1 { margin-bottom: var(--spacing-xs); }
.mb-2 { margin-bottom: var(--spacing-sm); }
.mb-3 { margin-bottom: var(--spacing-md); }
.mb-4 { margin-bottom: var(--spacing-lg); }

.p-0 { padding: 0; }
.p-1 { padding: var(--spacing-xs); }
.p-2 { padding: var(--spacing-sm); }
.p-3 { padding: var(--spacing-md); }
.p-4 { padding: var(--spacing-lg); }

.d-none { display: none; }
.d-block { display: block; }
.d-flex { display: flex; }
.d-grid { display: grid; }

.flex-col { flex-direction: column; }
.flex-row { flex-direction: row; }
.items-center { align-items: center; }
.justify-between { justify-content: space-between; }
.justify-center { justify-content: center; }
.gap-1 { gap: var(--spacing-xs); }
.gap-2 { gap: var(--spacing-sm); }
.gap-3 { gap: var(--spacing-md); }

.w-full { width: 100%; }
.h-full { height: 100%; }

.rounded { border-radius: var(--radius-md); }
.rounded-full { border-radius: var(--radius-full); }

.shadow-sm { box-shadow: var(--shadow-sm); }
.shadow-md { box-shadow: var(--shadow-md); }
.shadow-lg { box-shadow: var(--shadow-lg); }

/* ===================================
   Responsive Breakpoints
   =================================== */

/* Tablet (768px and up) */
@media (min-width: 768px) {
    :root {
        --font-size-base: 17px;
    }

    .app-content {
        padding: var(--spacing-lg);
        max-width: 768px;
        margin-left: auto;
        margin-right: auto;
    }

    .grid-cols-2 {
        grid-template-columns: repeat(2, 1fr);
    }

    .grid-cols-3 {
        grid-template-columns: repeat(3, 1fr);
    }

    .card {
        padding: var(--spacing-lg);
    }

    .bottom-nav {
        display: none;
    }

    body {
        padding-bottom: 0;
    }

    .desktop-nav {
        display: flex;
        gap: var(--spacing-md);
    }

    .hamburger-btn {
        display: none;
    }
}

/* Desktop (1024px and up) */
@media (min-width: 1024px) {
    .app-content {
        max-width: 1200px;
    }

    .modal {
        left: 50%;
        right: auto;
        transform: translateX(-50%) translateY(100%);
        width: 600px;
        border-radius: var(--radius-lg);
    }

    .modal.active {
        transform: translateX(-50%) translateY(50px);
    }
}

/* ===================================
   Dark Mode Toggle Button
   =================================== */

.dark-mode-toggle {
    position: fixed;
    bottom: calc(70px + var(--safe-area-bottom));
    right: var(--spacing-md);
    width: 56px;
    height: 56px;
    border-radius: 50%;
    background: var(--primary-color);
    color: var(--text-inverse);
    border: none;
    box-shadow: var(--shadow-lg);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    z-index: var(--z-sticky);
    transition: transform var(--transition-fast);
}

.dark-mode-toggle:active {
    transform: scale(0.9);
}

@media (min-width: 768px) {
    .dark-mode-toggle {
        bottom: var(--spacing-lg);
    }
}

/* ===================================
   Animations
   =================================== */

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes slideUp {
    from { transform: translateY(20px); opacity: 0; }
    to { transform: translateY(0); opacity: 1; }
}

@keyframes slideDown {
    from { transform: translateY(-20px); opacity: 0; }
    to { transform: translateY(0); opacity: 1; }
}

.fade-in {
    animation: fadeIn var(--transition-base);
}

.slide-up {
    animation: slideUp var(--transition-base);
}

.slide-down {
    animation: slideDown var(--transition-base);
}