/* Core Design System - Variables, Base Styles, Typography */

/* CSS Variables & Design System */
:root {
    /* Brand Colors - Consistent across themes */
    --primary: #2563EB;
    --primary-dark: #1D4ED8;
    --primary-light: #3B82F6;
    --primary-alpha: rgba(37, 99, 235, 0.08);
    
    --secondary: #8B5CF6;
    --secondary-dark: #7C3AED;
    --secondary-light: #A78BFA;
    
    --accent: #06B6D4;
    --accent-dark: #0891B2;
    --accent-light: #22D3EE;
    
    --success: #10B981;
    --warning: #F59E0B;
    --danger: #EF4444;
    --danger-dark: #DC2626;
    --info: #06B6D4;
    
    /* Light Theme Colors */
    --gray-900: #0F172A;
    --gray-800: #1E293B;
    --gray-700: #334155;
    --gray-600: #475569;
    --gray-500: #64748B;
    --gray-400: #94A3B8;
    --gray-300: #CBD5E1;
    --gray-200: #E2E8F0;
    --gray-100: #F1F5F9;
    --gray-50: #F8FAFC;
    
    --white: #FFFFFF;
    --black: #000000;
    
    /* Theme-aware Semantic Colors - Light Mode Defaults */
    --background: #FFFFFF;
    --surface: #FFFFFF;
    --surface-hover: #F8FAFC;
    --surface-elevated: #FFFFFF;
    --text-primary: #0F172A;
    --text-secondary: #475569;
    --text-tertiary: #64748B;
    --border: rgba(15, 23, 42, 0.06);
    --border-strong: rgba(15, 23, 42, 0.12);
    --input-bg: #FFFFFF;
    --card-bg: #FFFFFF;
    --shadow-color: rgba(15, 23, 42, 0.1);
    
    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
    --font-mono: 'SF Mono', Monaco, 'Cascadia Code', 'Roboto Mono', monospace;
    
    /* Font Sizes */
    --text-xs: 0.75rem;
    --text-sm: 0.875rem;
    --text-base: 1rem;
    --text-lg: 1.125rem;
    --text-xl: 1.25rem;
    --text-2xl: 1.5rem;
    --text-3xl: 1.875rem;
    --text-4xl: 2.25rem;
    
    /* Font Weights */
    --font-light: 300;
    --font-regular: 400;
    --font-medium: 500;
    --font-semibold: 600;
    --font-bold: 700;
    
    /* Spacing */
    --space-xs: 0.25rem;
    --space-sm: 0.5rem;
    --space-md: 1rem;
    --space-lg: 1.5rem;
    --space-xl: 2rem;
    --space-2xl: 3rem;
    --space-3xl: 4rem;
    
    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-2xl: 1.5rem;
    --radius-full: 9999px;
    
    /* Shadows - Theme-aware */
    --shadow-xs: 0 1px 2px var(--shadow-color);
    --shadow-sm: 0 2px 4px var(--shadow-color), 0 1px 2px var(--shadow-color);
    --shadow-md: 0 4px 6px var(--shadow-color), 0 2px 4px var(--shadow-color);
    --shadow-lg: 0 10px 15px var(--shadow-color), 0 4px 6px var(--shadow-color);
    --shadow-xl: 0 20px 25px var(--shadow-color), 0 10px 10px var(--shadow-color);
    --shadow-2xl: 0 25px 50px var(--shadow-color);
    
    /* Transitions */
    --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-base: 200ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 300ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-theme: 200ms cubic-bezier(0.4, 0, 0.2, 1);
    
    /* Z-index */
    --z-base: 0;
    --z-dropdown: 100;
    --z-sticky: 200;
    --z-fixed: 300;
    --z-modal-backdrop: 400;
    --z-modal: 500;
    --z-popover: 600;
    --z-tooltip: 700;
}

/* Dark Theme - Manual Toggle Support */
[data-theme="dark"] {
    --background: #0F0F0F;
    --surface: #1A1A1A;
    --surface-hover: #262626;
    --surface-elevated: #2A2A2A;
    --text-primary: #FAFAFA;
    --text-secondary: #A3A3A3;
    --text-tertiary: #737373;
    --border: rgba(255, 255, 255, 0.1);
    --border-strong: rgba(255, 255, 255, 0.2);
    --input-bg: #1A1A1A;
    --card-bg: #1A1A1A;
    --shadow-color: rgba(0, 0, 0, 0.5);
    
    /* Adjust brand colors for dark mode */
    --primary-alpha: rgba(37, 99, 235, 0.15);
    --success: #22C55E;
    --warning: #F59E0B;
    --danger: #EF4444;
}

/* System Preference Dark Mode */
@media (prefers-color-scheme: dark) {
    :root:not([data-theme]) {
        --background: #0F0F0F;
        --surface: #1A1A1A;
        --surface-hover: #262626;
        --surface-elevated: #2A2A2A;
        --text-primary: #FAFAFA;
        --text-secondary: #A3A3A3;
        --text-tertiary: #737373;
        --border: rgba(255, 255, 255, 0.1);
        --border-strong: rgba(255, 255, 255, 0.2);
        --input-bg: #1A1A1A;
        --card-bg: #1A1A1A;
        --shadow-color: rgba(0, 0, 0, 0.5);
        
        /* Adjust brand colors for dark mode */
        --primary-alpha: rgba(37, 99, 235, 0.15);
        --success: #22C55E;
        --warning: #F59E0B;
        --danger: #EF4444;
    }
}

/* Reset & Base */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

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

body {
    font-family: var(--font-family);
    font-size: var(--text-base);
    font-weight: var(--font-regular);
    line-height: 1.5;
    color: var(--text-primary);
    background-color: var(--background);
    overflow-x: hidden;
    transition: color var(--transition-theme), background-color var(--transition-theme);
}

/* Ensure form controls use the app's default typography */
input, select, textarea {
    font-family: var(--font-family) !important;
    font-size: var(--text-base) !important;
    font-weight: var(--font-regular) !important;
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-weight: var(--font-semibold);
    line-height: 1.2;
    letter-spacing: -0.02em;
}

h1 { font-size: var(--text-4xl); }
h2 { font-size: var(--text-3xl); }
h3 { font-size: var(--text-2xl); }
h4 { font-size: var(--text-xl); }
h5 { font-size: var(--text-lg); }
h6 { font-size: var(--text-base); }

p {
    line-height: 1.6;
    color: var(--text-secondary);
}

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

a:hover {
    color: var(--primary-dark);
}

/* Utility Classes */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

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

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

.hidden { display: none; }
.block { display: block; }
.flex { display: flex; }
.grid { display: grid; }

/* Special Effects */
.glow {
    box-shadow: 0 0 20px rgba(0, 122, 255, 0.4);
}

.gradient-text {
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.glass {
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
}

/* Loading */
.skeleton {
    background: linear-gradient(90deg, var(--gray-100) 25%, var(--gray-200) 50%, var(--gray-100) 75%);
    background-size: 200% 100%;
    animation: loading 1.5s ease-in-out infinite;
}

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

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

@keyframes fadeInUp {
    from { opacity: 0; transform: translateY(30px) scale(0.95); }
    to { opacity: 1; transform: translateY(0) scale(1); }
}

@keyframes slideInFromRight {
    from { opacity: 0; transform: translateX(30px); }
    to { opacity: 1; transform: translateX(0); }
}

@keyframes scaleIn {
    from { opacity: 0; transform: scale(0.8); }
    to { opacity: 1; transform: scale(1); }
}

@keyframes slideUp {
    from { transform: translateY(100px); opacity: 0; }
    to { transform: translateY(0); opacity: 1; }
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* Theme-aware Base Styles */
* {
    transition: color var(--transition-theme), background-color var(--transition-theme), border-color var(--transition-theme), box-shadow var(--transition-theme);
}

/* Text Elements */
h1, h2, h3, h4, h5, h6 {
    color: var(--text-primary);
}

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

a {
    color: var(--primary);
}

/* Form Elements */
input, select, textarea {
    color: var(--text-primary);
    background: var(--input-bg);
    border-color: var(--border);
}

input::placeholder, textarea::placeholder {
    color: var(--text-tertiary);
    opacity: 0.7;
}

label {
    color: var(--text-primary);
}

/* Button Elements - Preserve white text on primary buttons */
.btn-primary, .btn-create, .btn-save, .upload-btn, .edit-btn-primary {
    color: white !important;
}

.btn-secondary, .btn-cancel, .edit-btn-secondary {
    color: var(--text-secondary);
    background: var(--surface);
    border-color: var(--border);
}

.btn-secondary:hover, .btn-cancel:hover, .edit-btn-secondary:hover {
    color: var(--text-primary);
    background: var(--surface-hover);
}

/* Complete Scrollbar Removal - Hide all scrollbars while maintaining scroll functionality */
/* Global scrollbar hiding for all elements */
* {
    scrollbar-width: none; /* Firefox */
    -ms-overflow-style: none; /* IE and Edge */
}

/* Webkit-based browsers (Chrome, Safari, Edge) - Hide scrollbars completely */
::-webkit-scrollbar {
    display: none;
    width: 0;
    height: 0;
    background: transparent;
}

::-webkit-scrollbar-track {
    display: none;
    background: transparent;
}

::-webkit-scrollbar-thumb {
    display: none;
    background: transparent;
}

::-webkit-scrollbar-corner {
    display: none;
    background: transparent;
}

::-webkit-resizer {
    display: none;
    background: transparent;
}

/* Ensure body and html don't show scrollbars */
html, body {
    overflow-x: hidden;
    scrollbar-width: none; /* Firefox */
    -ms-overflow-style: none; /* IE and Edge */
}

html::-webkit-scrollbar,
body::-webkit-scrollbar {
    display: none;
}

/* Hide scrollbars on all containers while maintaining scroll functionality */
.main-content,
.page-section,
.contacts-grid,
.contacts-list,
.reminders-list,
.dashboard-content,
.contact-form,
.modal-content,
.settings-content,
.primary-scroll,
.thin-scroll,
.invisible-scroll {
    scrollbar-width: none; /* Firefox */
    -ms-overflow-style: none; /* IE and Edge */
}

.main-content::-webkit-scrollbar,
.page-section::-webkit-scrollbar,
.contacts-grid::-webkit-scrollbar,
.contacts-list::-webkit-scrollbar,
.reminders-list::-webkit-scrollbar,
.dashboard-content::-webkit-scrollbar,
.contact-form::-webkit-scrollbar,
.modal-content::-webkit-scrollbar,
.settings-content::-webkit-scrollbar,
.primary-scroll::-webkit-scrollbar,
.thin-scroll::-webkit-scrollbar,
.invisible-scroll::-webkit-scrollbar {
    display: none;
    width: 0;
    height: 0;
}

/* Theme-aware scrollbar hiding */
[data-theme="dark"] *,
@media (prefers-color-scheme: dark) {
    :root:not([data-theme]) * {
        scrollbar-width: none;
        -ms-overflow-style: none;
    }
}

/* High contrast mode - keep scrollbars hidden for consistency */
@media (prefers-contrast: high) {
    * {
        scrollbar-width: none;
        -ms-overflow-style: none;
    }
    
    ::-webkit-scrollbar {
        display: none;
    }
}

/* Page Sections */
.page-section {
    width: 100%;
    min-height: 60vh;
}

/* Empty State Styles */
.empty-state {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 400px;
    padding: var(--space-3xl);
}

.empty-state-content {
    text-align: center;
    max-width: 400px;
}

.empty-state-icon {
    margin-bottom: var(--space-xl);
    opacity: 0.6;
}

.empty-state-title {
    font-size: var(--text-xl);
    font-weight: var(--font-semibold);
    color: var(--text-primary);
    margin-bottom: var(--space-sm);
}

.empty-state-description {
    font-size: var(--text-base);
    color: var(--text-secondary);
    margin-bottom: var(--space-xl);
    line-height: 1.6;
}

/* AI Interface Styles */
/* AI Chatbot Page - Clean & Simple */
.ai-chat-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 100%;
    padding: var(--space-2xl);
    gap: var(--space-2xl);
}

.ai-blob-container {
    position: relative;
    width: 280px;
    height: 280px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.ai-blob {
    position: relative;
    width: 100%;
    height: 100%;
}

.ai-blob svg {
    width: 100%;
    height: 100%;
    filter: drop-shadow(0 20px 40px rgba(37, 99, 235, 0.3));
}

.ai-blob-icon {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    z-index: 10;
    animation: float 3s ease-in-out infinite;
}

.ai-welcome {
    text-align: center;
    max-width: 500px;
}

.ai-welcome-title {
    font-size: var(--text-3xl);
    font-weight: var(--font-bold);
    color: var(--text-primary);
    margin-bottom: var(--space-sm);
    letter-spacing: -0.02em;
}

.ai-welcome-text {
    font-size: var(--text-lg);
    color: var(--text-secondary);
    line-height: 1.6;
    margin: 0;
}

.ai-coming-soon {
    display: inline-flex;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-sm) var(--space-lg);
    background: var(--gray-100);
    border-radius: var(--radius-full);
    font-size: var(--text-sm);
    font-weight: var(--font-semibold);
    color: var(--text-secondary);
}

.ai-coming-soon svg {
    opacity: 0.7;
}

@keyframes float {
    0%, 100% {
        transform: translate(-50%, -50%) translateY(0px);
    }
    50% {
        transform: translate(-50%, -50%) translateY(-10px);
    }
}

.reminder-counter {
    font-size: var(--text-sm);
    color: var(--text-tertiary);
    font-weight: var(--font-medium);
}

/* Animations */
@keyframes pulse {
    0%, 100% {
        transform: scale(1);
        opacity: 1;
    }
    50% {
        transform: scale(1.05);
        opacity: 0.7;
    }
}

@keyframes glow {
    0% {
        opacity: 0.5;
        transform: scale(1);
    }
    100% {
        opacity: 0.8;
        transform: scale(1.1);
    }
}