/* ============================================
   TextSight.ai - Main Design System
   Version: 2.0
   Last Updated: December 2025
   ============================================ */

/* ============================================
   CSS VARIABLES (Design Tokens)
   ============================================ */
:root {
    /* Primary Colors - Purple */
    --primary-50: #FAF5FF;
    --primary-100: #F3E8FF;
    --primary-200: #E9D5FF;
    --primary-300: #D8B4FE;
    --primary-400: #C084FC;
    --primary-500: #A855F7;
    --primary-600: #9333EA;
    --primary-700: #7E22CE;
    --primary-800: #6B21A8;
    --primary-900: #581C87;
    --primary: #9333EA;
    --primary-hover: #7E22CE;

    /* Semantic Colors */
    --success-50: #ECFDF5;
    --success-100: #D1FAE5;
    --success-500: #10B981;
    --success-600: #059669;
    --success-700: #047857;
    --success: #10B981;

    --warning-50: #FFFBEB;
    --warning-100: #FEF3C7;
    --warning-500: #F59E0B;
    --warning-600: #D97706;
    --warning: #F59E0B;

    --error-50: #FEF2F2;
    --error-100: #FEE2E2;
    --error-500: #EF4444;
    --error-600: #DC2626;
    --error: #EF4444;

    /* Neutral Colors (Light Theme) */
    --gray-50: #F9FAFB;
    --gray-100: #F3F4F6;
    --gray-200: #E5E7EB;
    --gray-300: #D1D5DB;
    --gray-400: #9CA3AF;
    --gray-500: #6B7280;
    --gray-600: #4B5563;
    --gray-700: #374151;
    --gray-800: #1F2937;
    --gray-900: #111827;

    /* Background Colors */
    --bg-primary: #FFFFFF;
    --bg-secondary: #F9FAFB;
    --bg-tertiary: #F3F4F6;

    /* Text Colors */
    --text-primary: #111827;
    --text-secondary: #6B7280;
    --text-tertiary: #9CA3AF;
    --text-inverse: #FFFFFF;

    /* Border Colors */
    --border-light: #E5E7EB;
    --border-default: #D1D5DB;
    --border-dark: #9CA3AF;

    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);

    /* Spacing */
    --space-1: 4px;
    --space-2: 8px;
    --space-3: 12px;
    --space-4: 16px;
    --space-5: 20px;
    --space-6: 24px;
    --space-8: 32px;
    --space-10: 40px;
    --space-12: 48px;

    /* Border Radius */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    --radius-full: 9999px;

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 200ms ease;
    --transition-slow: 300ms ease;

    /* Layout */
    --sidebar-width: 260px;
    --sidebar-collapsed-width: 72px;
    --header-height: 64px;
    --results-panel-width: 360px;
}

/* ============================================
   RESET & BASE STYLES
   ============================================ */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    font-size: 14px;
    line-height: 1.5;
    color: var(--text-primary);
    background-color: var(--bg-secondary);
    min-height: 100vh;
}

a {
    color: inherit;
    text-decoration: none;
}

button {
    font-family: inherit;
    cursor: pointer;
    border: none;
    background: none;
}

input, textarea, select {
    font-family: inherit;
    font-size: inherit;
}

img, svg {
    display: block;
    max-width: 100%;
}

/* ============================================
   TYPOGRAPHY
   ============================================ */
h1, .h1 {
    font-size: 30px;
    font-weight: 700;
    line-height: 1.2;
    color: var(--text-primary);
}

h2, .h2 {
    font-size: 24px;
    font-weight: 600;
    line-height: 1.3;
    color: var(--text-primary);
}

h3, .h3 {
    font-size: 20px;
    font-weight: 600;
    line-height: 1.4;
    color: var(--text-primary);
}

h4, .h4 {
    font-size: 16px;
    font-weight: 600;
    line-height: 1.4;
    color: var(--text-primary);
}

.text-sm {
    font-size: 13px;
}

.text-xs {
    font-size: 12px;
}

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

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

/* ============================================
   APP LAYOUT (3-Column)
   ============================================ */
.app-container {
    display: flex;
    min-height: 100vh;
}

.main-wrapper {
    display: flex;
    flex: 1;
    margin-left: var(--sidebar-width);
    transition: margin-left var(--transition-base);
}

.main-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    background-color: var(--bg-secondary);
}

.content-area {
    flex: 1;
    padding: var(--space-6);
    overflow-y: auto;
}

/* ============================================
   SIDEBAR
   ============================================ */
.sidebar {
    position: fixed;
    top: 0;
    left: 0;
    width: var(--sidebar-width);
    height: 100vh;
    background-color: var(--bg-primary);
    border-right: 1px solid var(--border-light);
    display: flex;
    flex-direction: column;
    z-index: 100;
    transition: width var(--transition-base), transform var(--transition-base);
}

.sidebar-header {
    padding: var(--space-5) var(--space-5);
    border-bottom: 1px solid var(--border-light);
}

.sidebar-logo {
    display: flex;
    align-items: center;
    gap: var(--space-3);
}

.sidebar-logo svg {
    width: 32px;
    height: 32px;
    color: var(--primary);
}

.sidebar-logo-text {
    font-size: 20px;
    font-weight: 700;
    color: var(--text-primary);
}

.sidebar-logo-text span {
    color: var(--primary);
}

/* New Scan Button */
.sidebar-action {
    padding: var(--space-4) var(--space-5);
}

.btn-new-scan {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    width: 100%;
    padding: var(--space-3) var(--space-4);
    background-color: var(--primary);
    color: var(--text-inverse);
    font-size: 14px;
    font-weight: 500;
    border-radius: var(--radius-lg);
    transition: background-color var(--transition-fast), box-shadow var(--transition-fast);
}

.btn-new-scan:hover {
    background-color: var(--primary-hover);
    box-shadow: var(--shadow-md);
}

.btn-new-scan svg {
    width: 18px;
    height: 18px;
}

/* Sidebar Navigation */
.sidebar-nav {
    flex: 1;
    padding: var(--space-4) var(--space-3);
    overflow-y: auto;
}

.nav-section {
    margin-bottom: var(--space-6);
}

.nav-section-title {
    padding: 0 var(--space-3);
    margin-bottom: var(--space-2);
    font-size: 11px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--text-tertiary);
}

.nav-item {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    padding: var(--space-3) var(--space-3);
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    font-size: 14px;
    font-weight: 500;
    transition: all var(--transition-fast);
}

.nav-item:hover {
    background-color: var(--gray-100);
    color: var(--text-primary);
}

.nav-item.active {
    background-color: var(--primary-100);
    color: var(--primary);
}

.nav-item svg {
    width: 20px;
    height: 20px;
    flex-shrink: 0;
}

.nav-item-badge {
    margin-left: auto;
    padding: 2px 8px;
    font-size: 11px;
    font-weight: 600;
    background-color: var(--primary-100);
    color: var(--primary);
    border-radius: var(--radius-full);
}

/* Sidebar Footer */
.sidebar-footer {
    padding: var(--space-4) var(--space-5);
    border-top: 1px solid var(--border-light);
}

.credits-box {
    padding: var(--space-4);
    background-color: var(--gray-50);
    border-radius: var(--radius-lg);
    margin-bottom: var(--space-3);
}

.credits-label {
    font-size: 12px;
    color: var(--text-secondary);
    margin-bottom: var(--space-1);
}

.credits-value {
    font-size: 16px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--space-2);
}

.credits-bar {
    height: 6px;
    background-color: var(--gray-200);
    border-radius: var(--radius-full);
    overflow: hidden;
}

.credits-fill {
    height: 100%;
    background-color: var(--primary);
    border-radius: var(--radius-full);
    transition: width var(--transition-slow);
}

.btn-upgrade {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    width: 100%;
    padding: var(--space-3) var(--space-4);
    background-color: var(--gray-100);
    color: var(--text-primary);
    font-size: 14px;
    font-weight: 500;
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
}

.btn-upgrade:hover {
    background-color: var(--gray-200);
}

.btn-upgrade svg {
    width: 16px;
    height: 16px;
    color: var(--primary);
}

/* ============================================
   HEADER
   ============================================ */
.header {
    position: sticky;
    top: 0;
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: var(--header-height);
    padding: 0 var(--space-6);
    background-color: var(--bg-primary);
    border-bottom: 1px solid var(--border-light);
    z-index: 50;
}

.header-left {
    display: flex;
    align-items: center;
    gap: var(--space-4);
}

.header-title {
    font-size: 18px;
    font-weight: 600;
    color: var(--text-primary);
}

.header-breadcrumb {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    font-size: 14px;
    color: var(--text-secondary);
}

.header-breadcrumb svg {
    width: 16px;
    height: 16px;
}

.header-right {
    display: flex;
    align-items: center;
    gap: var(--space-4);
}

/* Header Icons */
.header-icon-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    transition: all var(--transition-fast);
}

.header-icon-btn:hover {
    background-color: var(--gray-100);
    color: var(--text-primary);
}

.header-icon-btn svg {
    width: 20px;
    height: 20px;
}

/* User Menu */
.user-menu {
    position: relative;
}

.user-menu-trigger {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    padding: var(--space-2) var(--space-3);
    border-radius: var(--radius-md);
    transition: background-color var(--transition-fast);
}

.user-menu-trigger:hover {
    background-color: var(--gray-100);
}

.user-avatar {
    width: 36px;
    height: 36px;
    border-radius: var(--radius-full);
    background-color: var(--primary-100);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 14px;
    font-weight: 600;
    color: var(--primary);
    overflow: hidden;
}

.user-avatar img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.user-info {
    display: none;
}

.user-name {
    font-size: 14px;
    font-weight: 500;
    color: var(--text-primary);
}

.user-plan {
    font-size: 12px;
    color: var(--text-secondary);
}

.user-menu-dropdown {
    position: absolute;
    top: calc(100% + 8px);
    right: 0;
    width: 200px;
    background-color: var(--bg-primary);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-8px);
    transition: all var(--transition-fast);
    z-index: 200;
}

.user-menu.open .user-menu-dropdown {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.user-menu-header {
    padding: var(--space-4);
    border-bottom: 1px solid var(--border-light);
}

.user-menu-header .user-name {
    font-weight: 600;
}

.user-menu-header .user-email {
    font-size: 12px;
    color: var(--text-secondary);
    margin-top: 2px;
}

.user-menu-items {
    padding: var(--space-2);
}

.user-menu-item {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    width: 100%;
    padding: var(--space-2) var(--space-3);
    border-radius: var(--radius-md);
    font-size: 14px;
    color: var(--text-secondary);
    transition: all var(--transition-fast);
}

.user-menu-item:hover {
    background-color: var(--gray-100);
    color: var(--text-primary);
}

.user-menu-item svg {
    width: 16px;
    height: 16px;
}

.user-menu-item.danger {
    color: var(--error);
}

.user-menu-item.danger:hover {
    background-color: var(--error-50);
    color: var(--error);
}

/* ============================================
   CARDS
   ============================================ */
.card {
    background-color: var(--bg-primary);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-lg);
    padding: var(--space-6);
    transition: box-shadow var(--transition-fast);
}

.card:hover {
    box-shadow: var(--shadow-md);
}

.card-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--space-4);
}

.card-title {
    font-size: 16px;
    font-weight: 600;
    color: var(--text-primary);
}

.card-subtitle {
    font-size: 13px;
    color: var(--text-secondary);
    margin-top: 2px;
}

/* ============================================
   BUTTONS
   ============================================ */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    padding: var(--space-3) var(--space-5);
    font-size: 14px;
    font-weight: 500;
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
    cursor: pointer;
    border: none;
}

.btn svg {
    width: 18px;
    height: 18px;
}

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

.btn-primary:hover {
    background-color: var(--primary-hover);
    box-shadow: var(--shadow-md);
}

.btn-primary:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.btn-secondary {
    background-color: var(--gray-100);
    color: var(--text-primary);
}

.btn-secondary:hover {
    background-color: var(--gray-200);
}

.btn-outline {
    background-color: transparent;
    color: var(--text-primary);
    border: 1px solid var(--border-default);
}

.btn-outline:hover {
    background-color: var(--gray-50);
    border-color: var(--border-dark);
}

.btn-ghost {
    background-color: transparent;
    color: var(--text-secondary);
}

.btn-ghost:hover {
    background-color: var(--gray-100);
    color: var(--text-primary);
}

.btn-sm {
    padding: var(--space-2) var(--space-3);
    font-size: 13px;
}

.btn-lg {
    padding: var(--space-4) var(--space-6);
    font-size: 16px;
}

/* ============================================
   FORM ELEMENTS
   ============================================ */
.form-group {
    margin-bottom: var(--space-4);
}

.form-label {
    display: block;
    font-size: 14px;
    font-weight: 500;
    color: var(--text-primary);
    margin-bottom: var(--space-2);
}

.form-input {
    width: 100%;
    padding: var(--space-3) var(--space-4);
    font-size: 14px;
    color: var(--text-primary);
    background-color: var(--bg-primary);
    border: 1px solid var(--border-default);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
}

.form-input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(147, 51, 234, 0.1);
}

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

.form-input:disabled {
    background-color: var(--gray-100);
    cursor: not-allowed;
}

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

.form-helper {
    font-size: 12px;
    color: var(--text-secondary);
    margin-top: var(--space-1);
}

.form-error {
    font-size: 12px;
    color: var(--error);
    margin-top: var(--space-1);
}

/* ============================================
   BADGES
   ============================================ */
.badge {
    display: inline-flex;
    align-items: center;
    padding: 2px 10px;
    font-size: 12px;
    font-weight: 500;
    border-radius: var(--radius-full);
}

.badge-primary {
    background-color: var(--primary-100);
    color: var(--primary);
}

.badge-success {
    background-color: var(--success-100);
    color: var(--success-700);
}

.badge-warning {
    background-color: var(--warning-100);
    color: var(--warning-600);
}

.badge-error {
    background-color: var(--error-100);
    color: var(--error-600);
}

.badge-gray {
    background-color: var(--gray-100);
    color: var(--gray-600);
}

/* ============================================
   LOADING STATES
   ============================================ */
.spinner {
    width: 20px;
    height: 20px;
    border: 2px solid var(--gray-200);
    border-top-color: var(--primary);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

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

.skeleton {
    background: linear-gradient(90deg, var(--gray-200) 25%, var(--gray-100) 50%, var(--gray-200) 75%);
    background-size: 200% 100%;
    animation: skeleton-loading 1.5s infinite;
    border-radius: var(--radius-md);
}

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

/* ============================================
   EMPTY STATE
   ============================================ */
.empty-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: var(--space-12);
    text-align: center;
}

.empty-state-icon {
    width: 64px;
    height: 64px;
    margin-bottom: var(--space-4);
    color: var(--text-tertiary);
}

.empty-state-title {
    font-size: 18px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--space-2);
}

.empty-state-description {
    font-size: 14px;
    color: var(--text-secondary);
    margin-bottom: var(--space-6);
    max-width: 320px;
}

/* ============================================
   TOAST NOTIFICATIONS
   ============================================ */
.toast-container {
    position: fixed;
    bottom: var(--space-6);
    right: var(--space-6);
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
    z-index: 1000;
}

.toast {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    padding: var(--space-4);
    background-color: var(--bg-primary);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    animation: toast-slide-in 0.3s ease;
}

@keyframes toast-slide-in {
    from {
        transform: translateX(100%);
        opacity: 0;
    }
    to {
        transform: translateX(0);
        opacity: 1;
    }
}

.toast-icon {
    width: 20px;
    height: 20px;
    flex-shrink: 0;
}

.toast-success .toast-icon {
    color: var(--success);
}

.toast-error .toast-icon {
    color: var(--error);
}

.toast-warning .toast-icon {
    color: var(--warning);
}

.toast-message {
    font-size: 14px;
    color: var(--text-primary);
}

.toast-close {
    margin-left: auto;
    color: var(--text-tertiary);
    cursor: pointer;
}

.toast-close:hover {
    color: var(--text-secondary);
}

/* ============================================
   MOBILE SIDEBAR TOGGLE
   ============================================ */
.mobile-menu-btn {
    display: none;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border-radius: var(--radius-md);
    color: var(--text-secondary);
}

.mobile-menu-btn svg {
    width: 24px;
    height: 24px;
}

.sidebar-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background-color: rgba(0, 0, 0, 0.5);
    z-index: 90;
}

/* ============================================
   RESPONSIVE STYLES
   ============================================ */
@media (min-width: 1024px) {
    .user-info {
        display: block;
    }
}

@media (max-width: 1023px) {
    .sidebar {
        transform: translateX(-100%);
    }

    .sidebar.open {
        transform: translateX(0);
    }

    .sidebar-overlay.active {
        display: block;
    }

    .main-wrapper {
        margin-left: 0;
    }

    .mobile-menu-btn {
        display: flex;
    }
}

@media (max-width: 767px) {
    .content-area {
        padding: var(--space-4);
    }

    .header {
        padding: 0 var(--space-4);
    }
}

/* ============================================
   UTILITY CLASSES
   ============================================ */
.hidden {
    display: none !important;
}

.flex {
    display: flex;
}

.flex-col {
    flex-direction: column;
}

.items-center {
    align-items: center;
}

.justify-between {
    justify-content: space-between;
}

.justify-center {
    justify-content: center;
}

.gap-2 {
    gap: var(--space-2);
}

.gap-3 {
    gap: var(--space-3);
}

.gap-4 {
    gap: var(--space-4);
}

.gap-6 {
    gap: var(--space-6);
}

.mt-2 {
    margin-top: var(--space-2);
}

.mt-4 {
    margin-top: var(--space-4);
}

.mt-6 {
    margin-top: var(--space-6);
}

.mb-4 {
    margin-bottom: var(--space-4);
}

.mb-6 {
    margin-bottom: var(--space-6);
}

.w-full {
    width: 100%;
}

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

.truncate {
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

/* Scrollbar Styling */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: transparent;
}

::-webkit-scrollbar-thumb {
    background-color: var(--gray-300);
    border-radius: var(--radius-full);
}

::-webkit-scrollbar-thumb:hover {
    background-color: var(--gray-400);
}