/* ==========================================================================
   Unified CSS Stylesheet for joywhy.space
   ========================================================================== */

/* Google Fonts Import */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@200;300;400;500;600;700&family=Space+Mono:wght@400;700&display=swap');

/* ==========================================================================
   CSS Variables (Design System)
   ========================================================================== */
:root {
    /* Colors */
    --color-bg-primary: #040404;
    --color-bg-secondary: #0f0f0f;
    --color-bg-card: #1a1a1a;
    --color-bg-input: #2a2a2a;
    --color-text-light: #fefefe;
    --color-text-muted: #8e8e8e;
    --color-text-dark: #333333;
    --color-accent-blue: #00eaff;
    --color-accent-purple: #a879e6;
    --color-border-subtle: #1e1e1e;
    --color-success: #00ff88;
    --color-warning: #ffaa00;
    --color-error: #ff4757;
    
    /* Typography */
    --font-family-primary: 'Inter', sans-serif;
    --font-family-mono: 'Space Mono', monospace;
    --font-size-base: 1.05rem;
    --font-size-small: 0.85rem;
    --font-size-large: 1.25rem;
    --font-size-xl: 1.5rem;
    --font-size-xxl: 2rem;
    --line-height-base: 1.65;
    --line-height-tight: 1.2;
    
    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-xxl: 3rem;
    
    /* Layout */
    --border-radius: 8px;
    --border-radius-large: 12px;
    --max-width-container: 1200px;
    --max-width-form: 400px;
    
    /* Animation */
    --transition-speed-fast: 0.2s;
    --transition-speed-medium: 0.4s;
    --transition-ease: cubic-bezier(0.2, 0.8, 0.4, 1);
    
    /* Z-index scale */
    --z-dropdown: 1000;
    --z-sticky: 1010;
    --z-fixed: 1020;
    --z-modal-backdrop: 1030;
    --z-modal: 1040;
    --z-popover: 1050;
    --z-tooltip: 1060;
}

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

html {
    font-size: var(--font-size-base);
    scroll-behavior: smooth;
    height: 100%;
}

body {
    font-family: var(--font-family-primary);
    line-height: var(--line-height-base);
    background: var(--color-bg-primary);
    color: var(--color-text-light);
    min-height: 100vh;
    overflow-x: hidden;
}

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

h1 { font-size: var(--font-size-xxl); }
h2 { font-size: var(--font-size-xl); }
h3 { font-size: var(--font-size-large); }
h4, h5, h6 { font-size: var(--font-size-base); }

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

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

a:hover {
    color: var(--color-accent-purple);
}

/* ==========================================================================
   Layout Components
   ========================================================================== */
.container {
    max-width: var(--max-width-container);
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

.main-content {
    min-height: 100vh;
    padding: var(--spacing-xl) 0;
}

.card {
    background: var(--color-bg-card);
    border-radius: var(--border-radius);
    border: 1px solid var(--color-border-subtle);
    padding: var(--spacing-lg);
    margin-bottom: var(--spacing-md);
    transition: transform var(--transition-speed-fast) var(--transition-ease),
                box-shadow var(--transition-speed-fast) var(--transition-ease);
}

.card:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 32px rgba(0, 234, 255, 0.1);
}

/* ==========================================================================
   Forms
   ========================================================================== */
.form-container {
    max-width: var(--max-width-form);
    margin: 0 auto;
    padding: var(--spacing-xl);
    background: var(--color-bg-card);
    border-radius: var(--border-radius-large);
    border: 1px solid var(--color-border-subtle);
}

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

.form-label {
    display: block;
    font-size: var(--font-size-small);
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    color: var(--color-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.1em;
}

.form-input,
.form-textarea,
.form-select {
    width: 100%;
    padding: var(--spacing-md);
    font-size: var(--font-size-base);
    font-family: var(--font-family-primary);
    background: var(--color-bg-input);
    border: 1px solid var(--color-border-subtle);
    border-radius: var(--border-radius);
    color: var(--color-text-light);
    transition: border-color var(--transition-speed-fast) var(--transition-ease),
                box-shadow var(--transition-speed-fast) var(--transition-ease);
}

.form-input:focus,
.form-textarea:focus,
.form-select:focus {
    outline: none;
    border-color: var(--color-accent-blue);
    box-shadow: 0 0 0 3px rgba(0, 234, 255, 0.1);
}

.form-textarea {
    min-height: 100px;
    resize: vertical;
}

/* ==========================================================================
   Buttons
   ========================================================================== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md) var(--spacing-lg);
    font-size: var(--font-size-base);
    font-weight: 500;
    font-family: var(--font-family-primary);
    text-align: center;
    text-decoration: none;
    border: none;
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: all var(--transition-speed-fast) var(--transition-ease);
    white-space: nowrap;
}

.btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

/* Button Variants */
.btn-primary {
    background: linear-gradient(135deg, var(--color-accent-blue), var(--color-accent-purple));
    color: var(--color-text-light);
}

.btn-primary:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(0, 234, 255, 0.3);
}

.btn-secondary {
    background: var(--color-bg-card);
    color: var(--color-text-light);
    border: 1px solid var(--color-border-subtle);
}

.btn-secondary:hover:not(:disabled) {
    background: var(--color-bg-secondary);
    border-color: var(--color-accent-blue);
}

.btn-success {
    background: var(--color-success);
    color: var(--color-bg-primary);
}

.btn-warning {
    background: var(--color-warning);
    color: var(--color-bg-primary);
}

.btn-error {
    background: var(--color-error);
    color: var(--color-text-light);
}

.btn-google {
    background: #dd4b39;
    color: white;
}

.btn-google:hover:not(:disabled) {
    background: #c23321;
}

/* Button Sizes */
.btn-small {
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: var(--font-size-small);
}

.btn-large {
    padding: var(--spacing-lg) var(--spacing-xl);
    font-size: var(--font-size-large);
}

.btn-full {
    width: 100%;
}

/* ==========================================================================
   Navigation & Header
   ========================================================================== */
.page-header {
    position: relative;
    padding: var(--spacing-xl) var(--spacing-lg);
    border-bottom: 1px solid var(--color-border-subtle);
    margin-bottom: var(--spacing-xl);
    min-height: 120px;
}

.page-header .back-link {
    position: absolute;
    top: var(--spacing-lg);
    left: var(--spacing-lg);
    color: var(--color-accent-blue);
    text-decoration: none;
    font-family: var(--font-family-mono);
    font-size: var(--font-size-small);
    text-transform: uppercase;
    letter-spacing: 0.1em;
    transition: color var(--transition-speed-fast) var(--transition-ease);
    z-index: 10;
}

.page-header .back-link:hover {
    color: var(--color-text-light);
}

.nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-md) 0;
    border-bottom: 1px solid var(--color-border-subtle);
    margin-bottom: var(--spacing-xl);
}

.nav-brand {
    font-size: var(--font-size-large);
    font-weight: 700;
    color: var(--color-text-light);
}

.nav-links {
    display: flex;
    gap: var(--spacing-lg);
    list-style: none;
}

.nav-link {
    color: var(--color-text-muted);
    transition: color var(--transition-speed-fast) var(--transition-ease);
}

.nav-link:hover,
.nav-link.active {
    color: var(--color-accent-blue);
}

/* ==========================================================================
   Messages & Alerts
   ========================================================================== */
.message {
    padding: var(--spacing-md);
    border-radius: var(--border-radius);
    margin-bottom: var(--spacing-md);
    font-weight: 500;
}

.message-success {
    background: rgba(0, 255, 136, 0.1);
    color: var(--color-success);
    border: 1px solid rgba(0, 255, 136, 0.2);
}

.message-error {
    background: rgba(255, 71, 87, 0.1);
    color: var(--color-error);
    border: 1px solid rgba(255, 71, 87, 0.2);
}

.message-warning {
    background: rgba(255, 170, 0, 0.1);
    color: var(--color-warning);
    border: 1px solid rgba(255, 170, 0, 0.2);
}

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

.text-small { font-size: var(--font-size-small); }
.text-large { font-size: var(--font-size-large); }
.text-xl { font-size: var(--font-size-xl); }

.text-muted { color: var(--color-text-muted); }
.text-success { color: var(--color-success); }
.text-warning { color: var(--color-warning); }
.text-error { color: var(--color-error); }

.font-mono { font-family: var(--font-family-mono); }

.mb-0 { margin-bottom: 0; }
.mb-sm { margin-bottom: var(--spacing-sm); }
.mb-md { margin-bottom: var(--spacing-md); }
.mb-lg { margin-bottom: var(--spacing-lg); }
.mb-xl { margin-bottom: var(--spacing-xl); }

.mt-0 { margin-top: 0; }
.mt-sm { margin-top: var(--spacing-sm); }
.mt-md { margin-top: var(--spacing-md); }
.mt-lg { margin-top: var(--spacing-lg); }
.mt-xl { margin-top: var(--spacing-xl); }

.hidden { display: none !important; }
.visible { display: block !important; }

/* ==========================================================================
   Specific Components
   ========================================================================== */

/* Trip Cards */
.trip-item {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border-subtle);
    border-radius: var(--border-radius);
    padding: var(--spacing-lg);
    margin-bottom: var(--spacing-md);
    cursor: pointer;
    transition: all var(--transition-speed-fast) var(--transition-ease);
}

.trip-item:hover {
    transform: translateY(-2px);
    border-color: var(--color-accent-blue);
    box-shadow: 0 8px 32px rgba(0, 234, 255, 0.1);
}

.trip-route {
    display: flex;
    align-items: center;
    margin-bottom: var(--spacing-sm);
}

.trip-origin,
.trip-destination {
    font-weight: 600;
    font-size: var(--font-size-large);
}

/* Divider */
.divider {
    display: flex;
    align-items: center;
    margin: var(--spacing-lg) 0;
    color: var(--color-text-muted);
}

.divider::before,
.divider::after {
    content: '';
    flex: 1;
    height: 1px;
    background: var(--color-border-subtle);
}

.divider span {
    padding: 0 var(--spacing-md);
}

/* Loading States */
.loading {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 2px solid var(--color-border-subtle);
    border-radius: 50%;
    border-top-color: var(--color-accent-blue);
    animation: spin 0.8s ease-in-out infinite;
}

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

/* ==========================================================================
   Responsive Design
   ========================================================================== */
@media (max-width: 768px) {
    :root {
        --font-size-base: 1rem;
        --spacing-md: 0.75rem;
        --spacing-lg: 1rem;
        --spacing-xl: 1.5rem;
    }
    
    .container {
        padding: 0 var(--spacing-sm);
    }
    
    .form-container {
        padding: var(--spacing-lg);
    }
    
    .nav {
        flex-direction: column;
        gap: var(--spacing-md);
    }
    
    .nav-links {
        gap: var(--spacing-md);
    }
    
    .btn {
        padding: var(--spacing-sm) var(--spacing-md);
        font-size: var(--font-size-small);
    }
}

@media (max-width: 480px) {
    .trip-route {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--spacing-xs);
    }

    .form-input,
    .form-textarea,
    .form-select {
        font-size: 16px; /* Prevent zoom on iOS */
    }
}

/* ==========================================================================
   Theme Toggle Button
   ========================================================================== */
.theme-toggle {
    position: fixed;
    top: 20px;
    right: 20px;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    background: var(--color-bg-card);
    border: 2px solid var(--color-border-subtle);
    border-radius: var(--border-radius);
    color: var(--color-text-light);
    font-size: 0.875rem;
    font-weight: 500;
    font-family: var(--font-family-primary);
    cursor: pointer;
    z-index: var(--z-fixed);
    transition: all var(--transition-speed-fast) var(--transition-ease);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
    user-select: none;
}

.theme-toggle:hover {
    transform: translateY(-2px);
    border-color: var(--color-accent-blue);
    box-shadow: 0 4px 16px rgba(0, 234, 255, 0.2);
}

.theme-toggle:active {
    transform: translateY(0);
}

.theme-toggle-icon {
    width: 18px;
    height: 18px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: transform var(--transition-speed-medium) var(--transition-ease);
}

.theme-toggle:hover .theme-toggle-icon {
    transform: rotate(180deg);
}

/* Mobile adjustments */
@media (max-width: 768px) {
    .theme-toggle {
        top: 15px;
        right: 15px;
        padding: 0.4rem 0.75rem;
        font-size: 0.8rem;
    }

    .theme-toggle-icon {
        width: 16px;
        height: 16px;
    }
}