/* ===================================
   FLS Empire - Main Styles
   Modern, Premium Design System
   =================================== */

/* CSS Variables - Design Tokens */
:root {
    /* Colors - Premium Palette */
    --color-primary: hsl(260, 85%, 58%);
    --color-primary-light: hsl(260, 85%, 68%);
    --color-primary-dark: hsl(260, 85%, 48%);
    --color-secondary: hsl(340, 82%, 52%);
    --color-accent: hsl(45, 100%, 51%);
    
    /* Gradients */
    --gradient-primary: linear-gradient(135deg, hsl(260, 85%, 58%) 0%, hsl(280, 85%, 68%) 100%);
    --gradient-secondary: linear-gradient(135deg, hsl(340, 82%, 52%) 0%, hsl(360, 82%, 62%) 100%);
    --gradient-gold: linear-gradient(135deg, hsl(45, 100%, 51%) 0%, hsl(35, 100%, 61%) 100%);
    --gradient-dark: linear-gradient(135deg, hsl(240, 20%, 12%) 0%, hsl(260, 25%, 18%) 100%);
    
    /* Background Colors */
    --bg-primary: hsl(240, 20%, 8%);
    --bg-secondary: hsl(240, 18%, 12%);
    --bg-tertiary: hsl(240, 16%, 16%);
    --bg-elevated: hsl(240, 18%, 14%);
    
    /* Text Colors */
    --text-primary: hsl(0, 0%, 98%);
    --text-secondary: hsl(0, 0%, 75%);
    --text-tertiary: hsl(0, 0%, 55%);
    
    /* UI Colors */
    --border-color: hsla(0, 0%, 100%, 0.1);
    --border-color-hover: hsla(0, 0%, 100%, 0.2);
    --shadow-sm: 0 2px 8px hsla(0, 0%, 0%, 0.3);
    --shadow-md: 0 4px 16px hsla(0, 0%, 0%, 0.4);
    --shadow-lg: 0 8px 32px hsla(0, 0%, 0%, 0.5);
    --shadow-glow: 0 0 20px hsla(260, 85%, 58%, 0.3);
    
    /* Typography */
    --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-display: 'Outfit', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    
    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    
    /* Border Radius */
    --radius-sm: 0.5rem;
    --radius-md: 0.75rem;
    --radius-lg: 1rem;
    --radius-xl: 1.5rem;
    --radius-full: 9999px;
    
    /* Transitions */
    --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-base: 250ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 350ms cubic-bezier(0.4, 0, 0.2, 1);
    
    /* Z-index */
    --z-base: 1;
    --z-dropdown: 100;
    --z-modal: 1000;
    --z-toast: 2000;
    --z-loading: 9999;
}

/* ===================================
   Reset & Base Styles
   =================================== */

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

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

body {
    font-family: var(--font-primary);
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
    min-height: 100vh;
    position: relative;
}

/* Animated Background */
body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: 
        radial-gradient(circle at 20% 30%, hsla(260, 85%, 58%, 0.15) 0%, transparent 50%),
        radial-gradient(circle at 80% 70%, hsla(340, 82%, 52%, 0.15) 0%, transparent 50%);
    z-index: -1;
    animation: backgroundPulse 15s ease-in-out infinite;
}

@keyframes backgroundPulse {
    0%, 100% { opacity: 0.5; }
    50% { opacity: 0.8; }
}

/* ===================================
   Loading Screen
   =================================== */

.loading-screen {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--gradient-dark);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: var(--z-loading);
    animation: fadeIn var(--transition-base);
}

.loading-content {
    text-align: center;
    padding: var(--spacing-xl);
}

.empire-logo {
    margin-bottom: var(--spacing-xl);
    animation: logoFloat 3s ease-in-out infinite;
}

.logo-icon {
    font-size: 5rem;
    margin-bottom: var(--spacing-md);
    filter: drop-shadow(0 0 20px hsla(45, 100%, 51%, 0.5));
}

.logo-text {
    font-family: var(--font-display);
    font-size: 2.5rem;
    font-weight: 800;
    background: var(--gradient-gold);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    letter-spacing: 0.05em;
}

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

.loading-bar {
    width: 300px;
    height: 6px;
    background: var(--bg-tertiary);
    border-radius: var(--radius-full);
    overflow: hidden;
    margin: 0 auto var(--spacing-md);
}

.loading-progress {
    height: 100%;
    background: var(--gradient-primary);
    border-radius: var(--radius-full);
    width: 0%;
    animation: loadingProgress 2s ease-out forwards;
    box-shadow: 0 0 10px var(--color-primary);
}

@keyframes loadingProgress {
    to { width: 100%; }
}

.loading-text {
    color: var(--text-secondary);
    font-size: 0.875rem;
    animation: pulse 2s ease-in-out infinite;
}

/* ===================================
   App Container
   =================================== */

.app-container {
    display: flex;
    flex-direction: column;
    height: 100vh;
    max-width: 100%;
    margin: 0 auto;
    overflow: hidden;
}

/* ===================================
   Header
   =================================== */

.app-header {
    background: var(--bg-elevated);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-color);
    padding: var(--spacing-md);
    display: flex;
    align-items: center;
    justify-content: space-between;
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: var(--shadow-sm);
}

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

.empire-icon {
    font-size: 2rem;
    filter: drop-shadow(0 2px 4px rgba(0, 0, 0, 0.3));
}

.empire-info {
    display: flex;
    flex-direction: column;
}

.empire-name {
    font-family: var(--font-display);
    font-size: 1.125rem;
    font-weight: 700;
    color: var(--text-primary);
    line-height: 1.2;
}

.empire-level {
    font-size: 0.75rem;
    color: var(--text-tertiary);
    font-weight: 500;
}

.header-right {
    display: flex;
    gap: var(--spacing-sm);
}

.currency-display {
    display: flex;
    gap: var(--spacing-sm);
}

.currency-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-xs) var(--spacing-md);
    background: var(--bg-tertiary);
    border-radius: var(--radius-full);
    border: 1px solid var(--border-color);
    transition: all var(--transition-base);
}

.currency-item:hover {
    border-color: var(--border-color-hover);
    transform: translateY(-2px);
    box-shadow: var(--shadow-sm);
}

.currency-item.fls {
    background: linear-gradient(135deg, hsla(45, 100%, 51%, 0.1) 0%, transparent 100%);
}

.currency-item.ton {
    background: linear-gradient(135deg, hsla(260, 85%, 58%, 0.1) 0%, transparent 100%);
}

.currency-icon {
    font-size: 1.125rem;
}

.currency-amount {
    font-weight: 700;
    font-size: 0.875rem;
    color: var(--text-primary);
}

/* ===================================
   Tab Content
   =================================== */

.tab-content {
    flex: 1;
    overflow-y: auto;
    overflow-x: hidden;
    position: relative;
}

.tab-pane {
    display: none;
    animation: fadeIn var(--transition-base);
}

.tab-pane.active {
    display: block;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ===================================
   Bottom Navigation
   =================================== */

.bottom-nav {
    display: flex;
    background: var(--bg-elevated);
    border-top: 1px solid var(--border-color);
    padding: var(--spacing-sm) 0;
    position: sticky;
    bottom: 0;
    z-index: 100;
    box-shadow: 0 -2px 8px hsla(0, 0%, 0%, 0.3);
}

.nav-btn {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-sm);
    background: transparent;
    border: none;
    color: var(--text-tertiary);
    cursor: pointer;
    transition: all var(--transition-base);
    position: relative;
}

.nav-btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 0;
    height: 3px;
    background: var(--gradient-primary);
    border-radius: 0 0 var(--radius-sm) var(--radius-sm);
    transition: width var(--transition-base);
}

.nav-btn.active::before {
    width: 60%;
}

.nav-btn.active {
    color: var(--text-primary);
}

.nav-btn:hover:not(.active) {
    color: var(--text-secondary);
    transform: translateY(-2px);
}

.nav-icon {
    font-size: 1.5rem;
    transition: transform var(--transition-base);
}

.nav-btn.active .nav-icon {
    transform: scale(1.1);
    filter: drop-shadow(0 0 8px var(--color-primary));
}

.nav-label {
    font-size: 0.75rem;
    font-weight: 600;
    letter-spacing: 0.02em;
}

/* ===================================
   Utility Classes
   =================================== */

.hidden {
    display: none !important;
}

.fade-in {
    animation: fadeIn var(--transition-base);
}

.slide-up {
    animation: slideUp var(--transition-base);
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.pulse {
    animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.6; }
}

/* ===================================
   Scrollbar Styling
   =================================== */

::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: var(--bg-secondary);
}

::-webkit-scrollbar-thumb {
    background: var(--bg-tertiary);
    border-radius: var(--radius-full);
    border: 2px solid var(--bg-secondary);
}

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

/* ===================================
   Responsive Design
   =================================== */

@media (max-width: 768px) {
    .empire-name {
        font-size: 1rem;
    }
    
    .currency-amount {
        font-size: 0.75rem;
    }
    
    .nav-label {
        font-size: 0.625rem;
    }
}

@media (max-width: 480px) {
    .app-header {
        padding: var(--spacing-sm);
    }
    
    .currency-item {
        padding: var(--spacing-xs) var(--spacing-sm);
    }
    
    .logo-text {
        font-size: 2rem;
    }
}