/*  ==========================================
    CSS VARIABLES (Design Tokens)
    ========================================== */

:root {
    
    /* COLORS */
    --color-primary:#1e73ff;
    --color-primary-dark: #1555cc;
    --color-secondary: #ffffff;
    --color-bg: #f7f9fc;
    --color-text: #222;
    --color-muted: #666;
    --color-danger: #dc3545;
    --color-success: #28a745;
    --color-warning: #ffc107;

    /* SURFACE COLORS */
    --color-card-bg: #ffffff;
    --color-border: #ddd;
    --color-bg-muted: #f0f0f0;
    --shadow-card: 0 4px 10px rgba(0, 0, 0, 0.08);

    /* BORDER RADII */
    --radius-sm: 6px;
    --radius-md: 12px;
    --radius-lg: 20px;

    /* SPACING */
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;

    /* FONTS */
    --font-body: system-ui, -apple-system, sans-serif;
}

/*  ==========================================
    BASE RESET & GLOBAL STYLES
    ========================================== */

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

body {
    font-family: var(--font-body);
    background: var(--color-bg);
    color: var(--color-text);
    line-height: 1.6;
}

/*  ==========================================
    TYPOGRAPHY
    ========================================== */

h1, h2, h3 {
    margin-bottom: var(--spacing-md);
    font-weight: 700;
}

h1 { 
    font-size: 2rem; 
}

h2 { 
    font-size: 1.6rem;
}

h3 { 
    font-size: 1.3rem;
}

p {
    margin: var(--spacing-sm) 0;
    color: var(--color-muted);
}

/*  ==========================================
    LAYOUT
    ========================================== */

.container {
    width: 90%;
    max-width: 1100px;
    margin: 0 auto; 
    padding: var(--spacing-lg) 0;
}

/*  ==========================================
    HEADER & NAVIGATION
    ========================================== */

.site-header {
    padding: var(--spacing-md) 0;
    background: var(--color-card-bg);
    box-shadow: var(--shadow-card);
    position: sticky;
    top: 0;
    z-index: 100;
}

.header-container {
    width: 90%;
    max-width: 1100px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--color-primary);
}

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

.nav-link {
    text-decoration: none;
    color: var(--color-text);
    font-weight: 500;
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-sm);
    transition: background 0.2s;
    cursor: pointer;
}

.nav-link:hover {
    background: var(--color-bg);
}

.new-link.active {
    color: var(--color-primary);
    background: var(--color-bg);
}

.user-info {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);  /* creating a little more space between the name and the button */
    font-size: 0.9rem;
    color: var(--color-muted);
}

.user-info span {
    margin-right: var(--spacing-sm); /* extra space between the name and the button */
}

/*  ==========================================
    BUTTONS
    ========================================== */

    button, .btn {
    border: none;
    cursor: pointer;
    font-family: var(--font-body);
    padding: 0.875rem 1.75rem;
    border-radius: var(--radius-md);
    font-weight: 600;
    font-size: 1rem;
    transition: all 0.2s ease;
    display: inline-block;
    text-decoration: none;
    text-align: center;
}

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

.btn-primary:hover {
    background: var(--color-primary-dark);
}

.btn-secondary {
    background: var(--color-bg-muted);
    color: var(--color-text);
}

.btn-secondary:hover {
    background: #e0e0e0;
}

.btn-danger {
    background: var(--color-danger);
    color: white;
}

.btn-danger:hover {
    color: #c82333;
}

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

.btn-success:hover {
    background: #218838;
}

.btn-block {
    width: 100%
}

.btn-link {
    background: none;
    color: var(--color-primary);
    padding: 0;
    text-decoration: underline;
    font-weight: normal;
}

.btn-link:hover {
    color: var(--color-primary-dark);
}

/* Hero-specific buttons */
.btn-hero-primary {
    background: white;
    color: var(--color-primary);
    padding: 1rem 2.5rem;
    font-size: 1.1rem;
}

.btn-hero-primary:hover {
    background: #f0f0f0;
}

.btn-hero-secondary {
    background: transparent;
    color: white;
    border: 2px solid white;
    padding: 1rem 2.5rem;
    font-size: 1.1rem;
}

.btn-hero-secondary:hover {
    background: rgba(255, 255, 255, 0.1);
}

/*  ==========================================
    FORMS
    ========================================== */

label {
    display: block;
    margin-bottom: var(--spacing-sm);
    font-weight: 600;
    color: var(--color-text);
}

input, select, textarea {
    width: 100%;
    padding: 0.875rem;
    border-radius: var(--radius-md);
    border: 2px solid var(--color-border);
    background: var(--color-secondary);
    font-family: var(--font-body);
    font-size: 1rem;
    margin-bottom: var(--spacing-md);
}

input:focus, select:focus, textarea:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(30, 115, 255, 0.1);
}

.error-message {
    color: var(--color-danger);
    font-size: 0.9rem;
    margin-top: var(--spacingg-sm);
    margin-bottom: var(--spacing-md);
    display: none;
}

.error-message.show {
    display: block;
}

/*  ==========================================
    CARDS
    ========================================== */

.card {
    background: var(--color-card-bg);
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-card);
    margin-bottom: var(--spacing-md);
}

.bet-card {
    background: var(--color-card-bg);
    padding: var(--spacing-lg);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-card);
    margin-bottom: var(--spacing-md);
    border-left: 4px solid var(--color-primary);
}

.bet-card h3 {
    margin-bottom: var(--spacing-sm);
}

.bet-card .bet-amount {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-primary);
    margin: var(--spacing-sm) 0;
}

.bet-card .bet-meta {
    color: var(--color-muted);
    font-size: 0.9rem;
    margin-top: var(--spacing-sm);
}

/*  ==========================================
    GRID SYSTEM
    ========================================== */

.grid-2 {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-md);
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--spacing-lg);
}

/*  ==========================================
    HERO SECTION
    ========================================== */

.hero {
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
    color: var(--color-secondary);
    padding: 4rem 0;
    text-align: center;
}

.hero-container {
    width: 90%;
    max-width: 800px;
    margin: 0 auto;
}

.hero h1 {
    font-size: 3rem;
    margin-bottom: var(--spacing-md);
    color: white;
}

.hero-subtext {
    font-size: 1.3rem;
    color: rgba(255, 255, 255, 0.9);
    margin-bottom: var(--spacing-xl);
}

.hero-buttons {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
    flex-wrap: wrap;
}

/*  ==========================================
    FEATURES SECTION
    ========================================== */

.features-section {
    padding: var(--spacing-xl) 0;
}

.feature-card {
    background: var(--color-card-bg);
    padding: var(--spacing-xl);
    text-align: center;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-card);
    transition: transform 0.2s, box-shadow 0.2s;
}

.feature-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.12);
}

.feature-icon {
    font-size: 3rem;
    margin-bottom: var(--spacing-md);
    color: var(--color-primary);
}

.feature-icon svg {
    color: var(--color-primary);
}

.feature-card h3 {
    margin-bottom: var(--spacing-sm);
    color: var(--color-text);
}

.feature-card p {
    color: var(--color-muted);
    line-height: 1.6;
}

/*  ==========================================
    BADGES
    ========================================== */

.badge {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    border-radius: var(--radius-sm);
    font-size: 0.85rem;
    font-weight: 600;
}

.badge-pending {
    background: var(--color-warning);
    color: #333;
}

.badge-active {
    background: var(--color-success);
    color: white;
}

.badge-settled {
    background: var(--color-muted);
    color: white;
}

/*  ==========================================
    EMPTY STATES
    ========================================== */

.empty-state {
    text-align: center;
    padding: var(--spacing-xl);
    color: var(--color-muted);
}

.empty-state-icon {
    font-size: 3rem;
    margin-bottom: var(--spacing-md);
    color: var(--color-muted);
    opacity: 0.5;
}

.empty-state-icon svg {
    color: var(--color-muted);
}

/*  ==========================================
    AUTH PAGES
    ========================================== */

.auth-container {
    max-width: 450px;
    margin: 3rem auto;
}

/*  ==========================================
    UTILITY CLASSES
    ========================================== */

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

/* SPACING UTILITIES */

.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); }

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

.hidden { 
    display: none; 
}

/*  ==========================================
    PAGE TRANSITIONS
    ========================================== */

.page {
    animation: fadeIn 0.3s ease-in;
}

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

/*  ==========================================
    RESPONSIVE DESIGN
    ========================================== */

@media (max-width: 768px) {
    .nav {
        gap: var(--spacing-sm);
    }
            
    .nav-link {
        padding: var(--spacing-sm);
        font-size: 0.9rem;
    }

    h1 { font-size: 1.75rem; }
    h2 { font-size: 1.4rem; }
    h3 { font-size: 1.2rem; }

    .hero h1 {
        font-size: 2rem;
    }

    .hero-subtext {
        font-size: 1.1rem;
    }

    .hero-buttons {
        flex-direction: column;
        align-items: stretch;
    }

    .features-grid {
        grid-template-columns: 1fr;
    }

    .grid-2 {
        grid-template-columns: 1fr;
    }   
}

/*  ==========================================
    MODAL
    ========================================== */

.modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    animation: fadeIn 0.3s;
}

.modal.show {
    display: flex;
    justify-content: center;
    align-items: center;
}

.modal-content {
    background: var(--color-card-bg);
    border-radius: var(--radius-lg);
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.2);
    max-width: 500px;
    width: 90%;
    max-height: 80vh;
    overflow-y: auto;
}

.modal-header {
    padding: var(--spacing-lg);
    border-bottom: 2px solid var(--color-bg);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.modal-header h2 {
    margin: 0;
}

.btn-close {
    background: none;
    border: none;
    font-size: 2rem;
    cursor: pointer;
    color: var(--color-muted);
    padding: 0;
    width: 40px;
    height: 40px;
    line-height: 1;
}

.btn-close:hover {
    color: var(--color-danger);
}

.modal-body {
    padding: var(--spacing-lg);
}

#user-search-results {
    margin-top: var(--spacing-md);
}

.user-search-result {
    padding: var(--spacing-md);
    background: var(--color-bg);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-sm);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.member-item {
    padding: var(--spacing-md);
    background: var(--color-bg);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-sm);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.member-item button {
    padding: 0.5rem 1rem;
    font-size: 0.9rem;
}