/**
 * PlanMate Main Stylesheet
 * Base styles and color palette
 */

:root {
    /* Primary Colors */
    --color-electric-blue: #1E90FF;
    --color-deep-indigo: #0D1B2A;
    
    /* Accent Colors */
    --color-cyan: #00FFD1;
    --color-neon-purple: #9B59FF;
    --color-magenta: #FF3CAC;
    
    /* Neutral Colors */
    --color-dark-gray: #121212;
    --color-light-gray: #E0E0E0;
    --color-white: #FFFFFF;
    
    /* Background Colors */
    --bg-primary: var(--color-deep-indigo);
    --bg-secondary: var(--color-dark-gray);
    --bg-card: rgba(18, 18, 18, 0.8);
    
    /* Text Colors */
    --text-primary: var(--color-white);
    --text-secondary: var(--color-light-gray);
    --text-muted: rgba(224, 224, 224, 0.6);
    
    /* Border Colors */
    --border-color: rgba(30, 144, 255, 0.2);
    
    /* Shadows */
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 8px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 8px 16px rgba(0, 0, 0, 0.5);
    --shadow-glow: 0 0 20px rgba(0, 255, 209, 0.3);
    
    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    
    /* Border Radius */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    
    /* Transitions */
    --transition-fast: 0.15s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background: var(--bg-primary);
    background-image: 
        radial-gradient(at 20% 30%, rgba(30, 144, 255, 0.1) 0px, transparent 50%),
        radial-gradient(at 80% 70%, rgba(0, 255, 209, 0.1) 0px, transparent 50%),
        radial-gradient(at 50% 50%, rgba(155, 89, 255, 0.05) 0px, transparent 50%);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

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

h1 { font-size: 2.5rem; }
h2 { font-size: 2rem; }
h3 { font-size: 1.5rem; }
h4 { font-size: 1.25rem; }

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

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

a:hover {
    color: var(--color-cyan);
}

/* Layout */
.main-content {
    padding: var(--spacing-xl);
    max-width: 1400px;
    margin: 0 auto;
    padding-top: calc(80px + var(--spacing-xl));
}

.page-header {
    margin-bottom: var(--spacing-xl);
    position: relative;
    padding-bottom: var(--spacing-md);
}

.page-header::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 60px;
    height: 3px;
    background: linear-gradient(90deg, var(--color-electric-blue), var(--color-cyan));
    border-radius: 2px;
}

.page-title {
    font-size: 2.5rem;
    background: linear-gradient(135deg, var(--color-electric-blue), var(--color-cyan), var(--color-neon-purple));
    background-size: 200% 200%;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    animation: gradientShift 3s ease infinite;
    font-weight: 700;
    letter-spacing: -0.5px;
    text-shadow: 0 0 30px rgba(0, 255, 209, 0.3);
    position: relative;
    display: inline-block;
}

@keyframes gradientShift {
    0%, 100% {
        background-position: 0% 50%;
    }
    50% {
        background-position: 100% 50%;
    }
}

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

/* Loading State */
.loading {
    text-align: center;
    padding: var(--spacing-xl);
    color: var(--text-muted);
    font-size: 1rem;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
}

.loading::before {
    content: '⏳';
    font-size: 1.5rem;
    animation: pulse 1.5s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% {
        opacity: 1;
        transform: scale(1);
    }
    50% {
        opacity: 0.6;
        transform: scale(0.95);
    }
}

/* Skeleton Loading Screens */
.skeleton {
    background: linear-gradient(
        90deg,
        rgba(18, 18, 18, 0.5) 0%,
        rgba(30, 144, 255, 0.1) 50%,
        rgba(18, 18, 18, 0.5) 100%
    );
    background-size: 200% 100%;
    animation: skeleton-loading 1.5s ease-in-out infinite;
    border-radius: var(--radius-md);
}

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

.skeleton-card {
    height: 120px;
    margin-bottom: var(--spacing-md);
    border: 1px solid rgba(30, 144, 255, 0.1);
}

.skeleton-line {
    height: 16px;
    margin-bottom: var(--spacing-sm);
    border-radius: var(--radius-sm);
}

.skeleton-line.short {
    width: 60%;
}

.skeleton-line.medium {
    width: 80%;
}

.skeleton-line.long {
    width: 100%;
}

.skeleton-circle {
    width: 40px;
    height: 40px;
    border-radius: 50%;
}

/* Progress Indicator */
.progress-indicator {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md);
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.progress-spinner {
    width: 20px;
    height: 20px;
    border: 2px solid rgba(0, 255, 209, 0.2);
    border-top-color: var(--color-cyan);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

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

.progress-bar {
    width: 100%;
    height: 4px;
    background: rgba(18, 18, 18, 0.5);
    border-radius: 2px;
    overflow: hidden;
    margin-top: var(--spacing-xs);
}

.progress-bar-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--color-cyan), var(--color-electric-blue));
    border-radius: 2px;
    animation: progress-animate 2s ease-in-out infinite;
    width: 60%;
}

@keyframes progress-animate {
    0%, 100% {
        transform: translateX(-100%);
    }
    50% {
        transform: translateX(400%);
    }
}

/* Error State with Retry */
.error-state {
    text-align: center;
    padding: var(--spacing-xl);
    color: var(--color-magenta);
}

.error-state-icon {
    font-size: 3rem;
    margin-bottom: var(--spacing-md);
    opacity: 0.7;
}

.error-state-message {
    margin-bottom: var(--spacing-lg);
    color: var(--text-primary);
}

.retry-button {
    background: linear-gradient(135deg, var(--color-magenta), var(--color-neon-purple));
    color: white;
    border: none;
    padding: var(--spacing-sm) var(--spacing-lg);
    border-radius: var(--radius-md);
    cursor: pointer;
    font-weight: 600;
    transition: all 0.3s;
}

.retry-button:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(255, 60, 172, 0.4);
}

/* Utility Classes */
.text-center { text-align: center; }
.text-muted { color: var(--text-muted); }
.mt-sm { margin-top: var(--spacing-sm); }
.mt-md { margin-top: var(--spacing-md); }
.mt-lg { margin-top: var(--spacing-lg); }
.mb-sm { margin-bottom: var(--spacing-sm); }
.mb-md { margin-bottom: var(--spacing-md); }
.mb-lg { margin-bottom: var(--spacing-lg); }

/* Auth Page */
.auth-page {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    background: linear-gradient(135deg, var(--color-deep-indigo) 0%, var(--color-dark-gray) 100%);
}

.auth-container {
    width: 100%;
    max-width: 450px;
    padding: var(--spacing-xl);
}

.auth-card {
    background: var(--bg-card);
    backdrop-filter: blur(10px);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-xl);
    padding: var(--spacing-xl);
    box-shadow: var(--shadow-lg);
}

.auth-header {
    text-align: center;
    margin-bottom: var(--spacing-xl);
}

.app-title {
    font-size: 2.5rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--color-electric-blue), var(--color-cyan));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: var(--spacing-sm);
}

.app-tagline {
    color: var(--text-muted);
    font-size: 1rem;
}

.auth-tabs {
    display: flex;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-lg);
    background: var(--bg-secondary);
    padding: var(--spacing-xs);
    border-radius: var(--radius-md);
}

.tab-btn {
    flex: 1;
    padding: var(--spacing-sm) var(--spacing-md);
    background: transparent;
    border: none;
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
    cursor: pointer;
    transition: all var(--transition-fast);
    font-weight: 500;
}

.tab-btn.active {
    background: linear-gradient(135deg, var(--color-electric-blue), var(--color-cyan));
    color: var(--color-white);
}

.auth-form {
    display: none;
}

.auth-form.active {
    display: block;
}

/* Responsive - Tablet */
@media (max-width: 1024px) {
    .main-content {
        padding: var(--spacing-lg);
        padding-top: calc(70px + var(--spacing-lg));
    }
}

/* Responsive - Mobile */
@media (max-width: 768px) {
    :root {
        --spacing-xs: 0.25rem;
        --spacing-sm: 0.5rem;
        --spacing-md: 0.75rem;
        --spacing-lg: 1rem;
        --spacing-xl: 1.5rem;
    }
    
    .main-content {
        padding: var(--spacing-md);
        padding-top: calc(70px + var(--spacing-md));
    }
    
    h1 { font-size: 1.75rem; }
    h2 { font-size: 1.5rem; }
    h3 { font-size: 1.25rem; }
    
    .page-header {
        margin-bottom: var(--spacing-lg);
    }
    
    .page-title {
        font-size: 2rem;
    }
    
    .auth-container {
        padding: var(--spacing-md);
    }
    
    .auth-card {
        padding: var(--spacing-lg);
        max-width: 100%;
    }
    
    .auth-tabs button {
        padding: var(--spacing-sm) var(--spacing-md);
        font-size: 0.9rem;
    }
}

/* Responsive - Small Mobile */
@media (max-width: 480px) {
    h1 { font-size: 1.5rem; }
    h2 { font-size: 1.25rem; }
    h3 { font-size: 1.1rem; }
    
    .page-title {
        font-size: 1.75rem;
    }
    
    .main-content {
        padding: var(--spacing-sm);
        padding-top: calc(65px + var(--spacing-sm));
    }
}