/* ==========================================================
 * A1 MOBILES - CORE STYLESHEET
 * Premium Mobile-First Design System (Phase 1 & Phase 2)
 * ========================================================== */

:root {
    /* Color Palette */
    --primary: #4f46e5;
    --primary-dark: #3730a3;
    --primary-light: #818cf8;
    --primary-glow: rgba(79, 70, 229, 0.15);
    --accent: #06b6d4;
    
    --bg-page: #f1f5f9;
    --surface: #ffffff;
    --surface-subtle: #f8fafc;
    --surface-border: #e2e8f0;
    
    --text-main: #0f172a;
    --text-muted: #64748b;
    --text-light: #94a3b8;
    
    --success: #10b981;
    --success-bg: #ecfdf5;
    --warning: #f59e0b;
    --warning-bg: #fffbeb;
    --danger: #ef4444;
    --danger-bg: #fef2f2;
    
    --badge-admin-bg: #e0e7ff;
    --badge-admin-color: #3730a3;
    --badge-viewer-bg: #f1f5f9;
    --badge-viewer-color: #475569;
    
    /* Layout & Geometry */
    --max-app-width: 480px;
    --radius-sm: 8px;
    --radius-md: 14px;
    --radius-lg: 20px;
    --radius-full: 9999px;
    
    /* Elevation */
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 12px -2px rgba(15, 23, 42, 0.08);
    --shadow-lg: 0 12px 28px -4px rgba(15, 23, 42, 0.12);
    --shadow-primary: 0 8px 20px -4px rgba(79, 70, 229, 0.35);
    
    /* Transitions */
    --transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

@media (prefers-color-scheme: dark) {
    :root {
        --bg-page: #0b0f19;
        --surface: #161e2e;
        --surface-subtle: #1f293d;
        --surface-border: #27354a;
        --text-main: #f8fafc;
        --text-muted: #94a3b8;
        --badge-viewer-bg: #1e293b;
        --badge-viewer-color: #cbd5e1;
    }
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background-color: var(--bg-page);
    color: var(--text-main);
    line-height: 1.5;
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: flex-start;
}

/* App Shell Container */
.app-viewport {
    width: 100%;
    max-width: var(--max-app-width);
    min-height: 100vh;
    background-color: var(--surface);
    display: flex;
    flex-direction: column;
    position: relative;
    box-shadow: 0 0 40px rgba(0, 0, 0, 0.1);
}

/* Top App Header */
.app-header {
    height: 64px;
    padding: 0 18px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    background: var(--surface);
    border-bottom: 1px solid var(--surface-border);
    position: sticky;
    top: 0;
    z-index: 100;
}

.brand-group {
    display: flex;
    align-items: center;
    gap: 10px;
}

.brand-icon {
    width: 36px;
    height: 36px;
    background: linear-gradient(135deg, var(--primary), #818cf8);
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #ffffff;
    font-weight: 800;
    font-size: 16px;
    box-shadow: var(--shadow-primary);
}

.brand-title {
    font-size: 18px;
    font-weight: 700;
    letter-spacing: -0.3px;
    color: var(--text-main);
}

.header-user-info {
    display: flex;
    align-items: center;
    gap: 10px;
}

.user-meta {
    text-align: right;
}

.user-name {
    font-size: 13px;
    font-weight: 600;
    line-height: 1.2;
}

/* Badges */
.badge {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 2px 8px;
    border-radius: var(--radius-full);
    font-size: 11px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.badge-admin {
    background-color: var(--badge-admin-bg);
    color: var(--badge-admin-color);
}

.badge-viewer {
    background-color: var(--badge-viewer-bg);
    color: var(--badge-viewer-color);
}

.header-actions {
    display: flex;
    align-items: center;
    gap: 8px;
}

.icon-btn {
    width: 36px;
    height: 36px;
    border-radius: 10px;
    border: 1px solid var(--surface-border);
    background: var(--surface-subtle);
    color: var(--text-muted);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    text-decoration: none;
    transition: var(--transition);
}

.icon-btn:hover {
    color: var(--primary);
    border-color: var(--primary-light);
    background: var(--surface);
}

/* Main Content */
.app-content {
    flex: 1;
    padding: 20px 18px 90px 18px;
}

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

.card-gradient {
    background: linear-gradient(135deg, #3730a3, #4f46e5);
    color: #ffffff;
    border: none;
    box-shadow: var(--shadow-primary);
}

.card-title {
    font-size: 12px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.8px;
    opacity: 0.85;
    margin-bottom: 6px;
}

.card-value {
    font-size: 28px;
    font-weight: 800;
    letter-spacing: -0.5px;
    word-break: break-word;
}

.card-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
    margin-bottom: 16px;
}

/* Phone Item Cards */
.phone-card {
    display: flex;
    align-items: center;
    gap: 14px;
    background: var(--surface);
    border: 1px solid var(--surface-border);
    border-radius: var(--radius-md);
    padding: 14px;
    margin-bottom: 12px;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
}

.phone-card:hover {
    border-color: var(--primary-light);
    box-shadow: var(--shadow-md);
}

.phone-card-image {
    width: 72px;
    height: 72px;
    border-radius: 10px;
    overflow: hidden;
    background-color: var(--surface-subtle);
    flex-shrink: 0;
    border: 1px solid var(--surface-border);
}

.phone-card-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}

.phone-card-body {
    flex: 1;
    min-width: 0;
}

.phone-name {
    font-size: 15px;
    font-weight: 700;
    color: var(--text-main);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    margin-bottom: 2px;
}

.phone-price {
    font-size: 14px;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: 2px;
}

.phone-imei {
    font-size: 11px;
    font-family: monospace;
    color: var(--text-muted);
}

.phone-date {
    font-size: 11px;
    color: var(--text-light);
}

.phone-card-action {
    flex-shrink: 0;
}

.btn-sell-placeholder {
    padding: 8px 14px;
    background: var(--surface-subtle);
    border: 1px solid var(--surface-border);
    color: var(--primary);
    border-radius: var(--radius-sm);
    font-size: 12px;
    font-weight: 700;
    cursor: pointer;
    transition: var(--transition);
}

.btn-sell-placeholder:hover {
    background: var(--primary-glow);
    border-color: var(--primary);
}

/* Form Styling */
.form-group {
    display: flex;
    flex-direction: column;
}

.form-label {
    font-size: 13px;
    font-weight: 600;
    color: var(--text-main);
    margin-bottom: 6px;
}

.form-input, .form-input-sm {
    width: 100%;
    padding: 12px 14px;
    font-size: 15px;
    background: var(--surface-subtle);
    border: 1px solid var(--surface-border);
    border-radius: var(--radius-md);
    color: var(--text-main);
    transition: var(--transition);
    appearance: none;
}

.form-input-sm {
    padding: 8px 10px;
    font-size: 13px;
    border-radius: var(--radius-sm);
}

.form-input:focus, .form-input-sm:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px var(--primary-glow);
    background: var(--surface);
}

/* Photo Upload Box */
.photo-upload-zone {
    border: 2px dashed var(--primary-light);
    background: var(--primary-glow);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: var(--transition);
    overflow: hidden;
}

.photo-upload-zone:hover {
    border-color: var(--primary);
    background: rgba(79, 70, 229, 0.08);
}

/* Buttons */
.btn-primary {
    width: 100%;
    padding: 14px;
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    color: #ffffff;
    border: none;
    border-radius: var(--radius-md);
    font-size: 15px;
    font-weight: 700;
    cursor: pointer;
    box-shadow: var(--shadow-primary);
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    text-decoration: none;
}

.btn-primary:hover:not(:disabled) {
    transform: translateY(-1px);
    box-shadow: 0 10px 24px -4px rgba(79, 70, 229, 0.5);
}

.btn-primary:disabled {
    opacity: 0.65;
    cursor: not-allowed;
}

.btn-secondary {
    padding: 8px 16px;
    background: var(--surface-subtle);
    border: 1px solid var(--surface-border);
    color: var(--text-main);
    border-radius: var(--radius-sm);
    font-size: 13px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
}

.btn-secondary:hover {
    background: var(--surface);
    border-color: var(--primary-light);
}

.btn-sm {
    padding: 6px 12px;
    font-size: 12px;
    border-radius: var(--radius-sm);
}

/* Section Titles & Empty State */
.section-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-top: 10px;
    margin-bottom: 14px;
}

.section-title {
    font-size: 16px;
    font-weight: 700;
    color: var(--text-main);
}

.empty-state {
    text-align: center;
    padding: 36px 20px;
    background: var(--surface-subtle);
    border: 1px dashed var(--surface-border);
    border-radius: var(--radius-md);
}

.empty-icon {
    width: 48px;
    height: 48px;
    margin: 0 auto 12px auto;
    color: var(--text-light);
}

.empty-title {
    font-size: 15px;
    font-weight: 600;
    color: var(--text-main);
    margin-bottom: 4px;
}

.empty-desc {
    font-size: 13px;
    color: var(--text-muted);
}

/* Bottom Navigation */
.bottom-nav {
    position: fixed;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 100%;
    max-width: var(--max-app-width);
    height: 68px;
    background: var(--surface);
    border-top: 1px solid var(--surface-border);
    display: flex;
    align-items: center;
    justify-content: space-around;
    z-index: 1000;
    box-shadow: 0 -4px 16px rgba(0, 0, 0, 0.04);
}

.nav-item {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 4px;
    text-decoration: none;
    color: var(--text-muted);
    font-size: 11px;
    font-weight: 600;
    height: 100%;
    transition: var(--transition);
    position: relative;
}

.nav-item svg {
    width: 22px;
    height: 22px;
    transition: var(--transition);
}

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

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

.nav-item.disabled {
    opacity: 0.45;
    cursor: not-allowed;
    pointer-events: none;
}

.nav-item.disabled::after {
    content: "🔒";
    position: absolute;
    top: 10px;
    right: 25%;
    font-size: 10px;
}

/* Login Screen */
.login-wrapper {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    padding: 24px;
    background: linear-gradient(180deg, #1e1b4b 0%, #0f172a 100%);
    color: #ffffff;
}

.login-card {
    background: rgba(30, 41, 59, 0.85);
    backdrop-filter: blur(12px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-lg);
    padding: 32px 24px;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.4);
    text-align: center;
}

.login-brand {
    font-size: 32px;
    font-weight: 800;
    letter-spacing: -0.5px;
    background: linear-gradient(135deg, #a5b4fc, #6366f1);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    margin-bottom: 4px;
}

.login-tagline {
    font-size: 13px;
    color: #94a3b8;
    letter-spacing: 2px;
    text-transform: uppercase;
    margin-bottom: 32px;
}

.pin-container {
    display: flex;
    justify-content: center;
    gap: 12px;
    margin-bottom: 24px;
}

.pin-digit {
    width: 52px;
    height: 60px;
    font-size: 24px;
    font-weight: 700;
    text-align: center;
    background: rgba(15, 23, 42, 0.6);
    border: 2px solid #334155;
    border-radius: var(--radius-md);
    color: #ffffff;
    transition: var(--transition);
    -webkit-text-security: disc;
}

.pin-digit:focus {
    outline: none;
    border-color: var(--primary-light);
    box-shadow: 0 0 0 4px var(--primary-glow);
    background: rgba(15, 23, 42, 0.9);
}

.alert-message {
    padding: 12px 16px;
    border-radius: var(--radius-sm);
    font-size: 14px;
    margin-bottom: 20px;
    display: none;
}

.alert-message.error {
    display: block;
    background-color: var(--danger-bg);
    border: 1px solid rgba(239, 68, 68, 0.3);
    color: var(--danger);
}

.alert-message.success {
    display: block;
    background-color: var(--success-bg);
    border: 1px solid rgba(16, 185, 129, 0.3);
    color: var(--success);
}

/* Spinner */
.spinner {
    width: 20px;
    height: 20px;
    border: 2.5px solid rgba(255, 255, 255, 0.3);
    border-top-color: #ffffff;
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
    display: inline-block;
}

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

/* Toast Notifications */
.toast-container {
    position: fixed;
    bottom: 80px;
    left: 50%;
    transform: translateX(-50%) translateY(20px);
    background: #0f172a;
    color: #ffffff;
    padding: 12px 20px;
    border-radius: var(--radius-full);
    font-size: 13px;
    font-weight: 600;
    box-shadow: var(--shadow-lg);
    z-index: 2000;
    opacity: 0;
    transition: all 0.3s ease;
    pointer-events: none;
}

.toast-container.show {
    opacity: 1;
    transform: translateX(-50%) translateY(0);
}