/* CSS variables for Design Tokens */
:root {
    /* Dark Theme (Default) */
    --bg-primary: #0a0f1d;
    --bg-secondary: rgba(16, 23, 42, 0.75);
    --border-color: rgba(255, 255, 255, 0.08);
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    
    /* Global Colors */
    --color-accent: #d4af37; /* FIFA Gold */
    --color-accent-glow: rgba(212, 175, 55, 0.15);
    --color-success: #10b981; /* Green */
    --color-success-bg: rgba(16, 185, 129, 0.1);
    --color-danger: #ef4444; /* Red */
    --color-danger-bg: rgba(239, 68, 68, 0.1);
    --color-draw: #64748b; /* Grey */
    --color-card-hover: rgba(30, 41, 59, 0.85);
    --shadow-premium: 0 10px 30px -10px rgba(0, 0, 0, 0.5), 0 1px 3px rgba(255, 255, 255, 0.05);
    
    /* Fonts */
    --font-primary: 'Outfit', 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    
    /* Layout */
    --border-radius-sm: 8px;
    --border-radius-md: 16px;
    --border-radius-lg: 24px;
    --transition-smooth: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Light Theme overrides */
body.light-theme {
    --bg-primary: #f1f5f9;
    --bg-secondary: rgba(255, 255, 255, 0.85);
    --border-color: rgba(0, 0, 0, 0.08);
    --text-primary: #0f172a;
    --text-secondary: #64748b;
    --color-card-hover: rgba(241, 245, 249, 0.95);
    --color-accent-glow: rgba(212, 175, 55, 0.1);
    --shadow-premium: 0 10px 30px -10px rgba(15, 23, 42, 0.08), 0 1px 3px rgba(0, 0, 0, 0.02);
}

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

body {
    background-color: var(--bg-primary);
    color: var(--text-primary);
    font-family: var(--font-primary);
    min-height: 100vh;
    transition: background-color 0.4s ease, color 0.4s ease;
    overflow-x: hidden;
    position: relative;
}

/* Confetti Canvas overlay */
#confetti-canvas {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 9999;
}

/* Container */
.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 1.5rem;
}

/* Header */
.main-header {
    background: linear-gradient(180deg, rgba(0, 0, 0, 0.4) 0%, rgba(0, 0, 0, 0) 100%);
    padding: 1.5rem 0;
    border-bottom: 1px solid var(--border-color);
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1rem;
}

.logo-area {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.logo-icon {
    font-size: 2.5rem;
    filter: drop-shadow(0 0 10px var(--color-accent));
}

.logo-area h1 {
    font-size: 1.5rem;
    font-weight: 800;
    letter-spacing: 1.5px;
    background: linear-gradient(135deg, #fff 0%, var(--color-accent) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    text-transform: uppercase;
}

.subtitle {
    font-size: 0.85rem;
    color: var(--text-secondary);
    font-weight: 400;
}

.controls-area {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

/* Buttons */
.btn {
    font-family: var(--font-primary);
    font-size: 0.9rem;
    font-weight: 600;
    padding: 0.6rem 1.2rem;
    border: 1px solid transparent;
    border-radius: var(--border-radius-sm);
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    transition: var(--transition-smooth);
}

.btn-icon {
    font-size: 1.1rem;
}

.btn-primary {
    background: linear-gradient(135deg, var(--color-accent) 0%, #a68420 100%);
    color: #111;
    box-shadow: 0 4px 15px rgba(212, 175, 55, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(212, 175, 55, 0.5);
    background: linear-gradient(135deg, #ffdc69 0%, var(--color-accent) 100%);
}

.btn-secondary {
    background-color: transparent;
    border-color: var(--border-color);
    color: var(--text-primary);
}

.btn-secondary:hover {
    background-color: var(--border-color);
    transform: translateY(-2px);
}

.btn-icon-only {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    border: 1px solid var(--border-color);
    background-color: transparent;
    color: var(--text-primary);
    font-size: 1.2rem;
    cursor: pointer;
    transition: var(--transition-smooth);
}

.btn-icon-only:hover {
    background-color: var(--border-color);
    transform: rotate(15deg);
}

/* Navigation Tabs */
.nav-tabs-container {
    margin: 1.5rem auto;
}

.nav-tabs {
    display: flex;
    gap: 0.5rem;
    border-bottom: 2px solid var(--border-color);
    padding-bottom: 0.5rem;
}

.tab-link {
    font-family: var(--font-primary);
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-secondary);
    background: none;
    border: none;
    padding: 0.75rem 1.5rem;
    cursor: pointer;
    border-radius: var(--border-radius-sm);
    display: flex;
    align-items: center;
    gap: 0.5rem;
    transition: var(--transition-smooth);
}

.tab-link:hover {
    color: var(--text-primary);
    background-color: rgba(255, 255, 255, 0.03);
}

body.light-theme .tab-link:hover {
    background-color: rgba(0, 0, 0, 0.03);
}

.tab-link.active {
    color: var(--color-accent);
    background-color: var(--color-accent-glow);
    border-bottom: 2px solid var(--color-accent);
}

/* Main Panels */
.tab-panel {
    display: none;
}

.tab-panel.active {
    display: block;
    animation: fadeIn 0.4s ease;
}

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

/* Groups Layout (Tab 1) */
.groups-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
    gap: 1.5rem;
    margin-bottom: 3rem;
}

/* Group Card */
.group-card {
    background: var(--bg-secondary);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-md);
    box-shadow: var(--shadow-premium);
    overflow: hidden;
    transition: var(--transition-smooth);
}

.group-card:hover {
    border-color: rgba(212, 175, 55, 0.25);
    box-shadow: 0 15px 35px -10px rgba(0, 0, 0, 0.6), 0 1px 3px rgba(212, 175, 55, 0.05);
}

.group-header {
    background: linear-gradient(90deg, rgba(212, 175, 55, 0.15) 0%, rgba(0,0,0,0) 100%);
    padding: 1rem 1.25rem;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.group-title {
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--text-primary);
    letter-spacing: 0.5px;
}

/* Standing Table */
.standings-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.8rem;
    margin-bottom: 0.5rem;
}

.standings-table th, 
.standings-table td {
    padding: 0.6rem 0.5rem;
    text-align: center;
}

.standings-table th {
    color: var(--text-secondary);
    font-weight: 600;
    border-bottom: 1px solid var(--border-color);
    text-transform: uppercase;
    font-size: 0.7rem;
}

.standings-table td.team-name-col {
    text-align: left;
    font-weight: 500;
    font-size: 0.85rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    max-width: 120px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.standings-table th.col-pts,
.standings-table td.col-pts {
    font-weight: 700;
    color: var(--text-primary);
    font-size: 0.85rem;
}

.standings-table tr {
    transition: var(--transition-smooth);
}

/* Highlights for Qualified Teams (Top 2) */
.standings-table tr.qualified-1 {
    background-color: rgba(16, 185, 129, 0.04);
}

.standings-table tr.qualified-2 {
    background-color: rgba(16, 185, 129, 0.02);
}

.standings-table tr.qualified-1 td.pos-num {
    color: var(--color-success);
    font-weight: 700;
}

.standings-table tr.qualified-2 td.pos-num {
    color: #34d399;
    font-weight: 700;
}

/* Flags styling */
.flag-icon {
    width: 20px;
    height: 14px;
    object-fit: cover;
    border-radius: 2px;
    box-shadow: 0 1px 3px rgba(0,0,0,0.3);
    flex-shrink: 0;
}

/* Group Matches section */
.group-matches {
    border-top: 1px solid var(--border-color);
    padding: 0.75rem 1.25rem 1.25rem;
}

.matches-section-title {
    font-size: 0.75rem;
    text-transform: uppercase;
    color: var(--text-secondary);
    margin-bottom: 0.75rem;
    letter-spacing: 0.5px;
    font-weight: 600;
}

.group-match-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.5rem 0;
    border-bottom: 1px dashed var(--border-color);
}

.group-match-row:last-child {
    border-bottom: none;
}

.match-team {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    flex: 1;
    font-size: 0.85rem;
}

.match-team.team-home {
    justify-content: flex-end;
    text-align: right;
}

.match-team.team-away {
    justify-content: flex-start;
    text-align: left;
}

.team-abbr {
    display: none;
    font-weight: 600;
    font-size: 0.8rem;
}

.score-inputs {
    display: flex;
    align-items: center;
    gap: 0.4rem;
    padding: 0 0.5rem;
}

.score-input {
    width: 28px;
    height: 28px;
    text-align: center;
    font-family: var(--font-primary);
    font-size: 0.9rem;
    font-weight: 700;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-sm);
    background-color: rgba(0, 0, 0, 0.25);
    color: var(--text-primary);
    outline: none;
    transition: var(--transition-smooth);
}

body.light-theme .score-input {
    background-color: rgba(0,0,0,0.05);
}

.score-input:focus {
    border-color: var(--color-accent);
    box-shadow: 0 0 8px rgba(212, 175, 55, 0.3);
}

/* Chrome, Safari, Edge, Opera: Remove spin buttons */
.score-input::-webkit-outer-spin-button,
.score-input::-webkit-inner-spin-button {
    -webkit-appearance: none;
    margin: 0;
}

/* Firefox: Remove spin buttons */
.score-input[type=number] {
    -moz-appearance: textfield;
}

.vs-divider {
    font-size: 0.7rem;
    font-weight: 600;
    color: var(--text-secondary);
}

/* Brackets Layout (Tab 2) */
.bracket-wrapper {
    overflow-x: auto;
    padding-bottom: 2rem;
    margin-bottom: 3rem;
}

.bracket-container {
    display: flex;
    gap: 3rem;
    min-width: 1200px;
    padding: 1.5rem 0.5rem;
    align-items: stretch;
}

.bracket-column {
    display: flex;
    flex-direction: column;
    width: 260px;
    flex-shrink: 0;
}

.round-title {
    font-size: 1.1rem;
    font-weight: 800;
    text-align: center;
    margin-bottom: 2rem;
    color: var(--color-accent);
    text-transform: uppercase;
    letter-spacing: 1px;
    position: relative;
    padding-bottom: 0.5rem;
    border-bottom: 1px solid var(--border-color);
}

.matches-list {
    display: flex;
    flex-direction: column;
    justify-content: space-around;
    flex-grow: 1;
    min-height: 800px;
    gap: 1.5rem;
}

/* Knockout Match Card */
.bracket-match-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-md);
    box-shadow: var(--shadow-premium);
    padding: 0.75rem;
    position: relative;
    transition: var(--transition-smooth);
}

.bracket-match-card:hover {
    border-color: rgba(212, 175, 55, 0.3);
    transform: translateX(3px);
}

.match-info-tag {
    font-size: 0.65rem;
    font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
    margin-bottom: 0.5rem;
    display: flex;
    justify-content: space-between;
}

.bracket-match-team {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.4rem 0.25rem;
    border-radius: var(--border-radius-sm);
    transition: var(--transition-smooth);
}

.bracket-match-team.qualified-team {
    background-color: rgba(255, 255, 255, 0.02);
}

body.light-theme .bracket-match-team.qualified-team {
    background-color: rgba(0, 0, 0, 0.01);
}

.bracket-match-team.winner {
    color: var(--color-success);
    font-weight: 600;
}

.bracket-match-team.loser {
    color: var(--text-secondary);
    opacity: 0.65;
}

.team-details {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.85rem;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    max-width: 170px;
}

/* Small placeholder text for brackets when teams are not decided */
.team-details.placeholder {
    color: var(--text-secondary);
    font-style: italic;
    opacity: 0.7;
}

.bracket-score-wrapper {
    display: flex;
    align-items: center;
    gap: 0.25rem;
}

/* Penalties inputs */
.penalty-input {
    width: 22px;
    height: 22px;
    font-size: 0.75rem;
    border-color: rgba(212, 175, 55, 0.3);
    border-radius: 50%;
    background-color: rgba(212, 175, 55, 0.05);
    color: var(--color-accent);
}

.penalty-input::placeholder {
    color: rgba(212, 175, 55, 0.4);
}

.penalty-input:focus {
    border-color: var(--color-success);
    box-shadow: 0 0 5px rgba(16, 185, 129, 0.4);
}

.penalty-label {
    font-size: 0.6rem;
    color: var(--color-accent);
    margin-right: 0.1rem;
    font-weight: 700;
}

/* Connectors lines via absolute positioning (hidden on mobile) */
/* For visual premiumness on large screens, we construct connector borders */
.bracket-match-card::after {
    content: '';
    position: absolute;
    right: -24px;
    top: 50%;
    width: 24px;
    height: 2px;
    background-color: var(--border-color);
    display: none; /* dynamically handled */
}

/* Champion Column Showcase */
.champion-column {
    justify-content: center;
    align-items: center;
}

.champion-card-wrapper {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    width: 100%;
}

.champion-card {
    background: radial-gradient(circle at top, rgba(212, 175, 55, 0.15) 0%, var(--bg-secondary) 100%);
    border: 2px solid var(--color-accent);
    border-radius: var(--border-radius-lg);
    padding: 2rem;
    text-align: center;
    box-shadow: 0 15px 40px rgba(212, 175, 55, 0.15);
    width: 100%;
    max-width: 260px;
    animation: pulseGlow 3s infinite alternate;
    transition: var(--transition-smooth);
}

@keyframes pulseGlow {
    0% { box-shadow: 0 15px 40px rgba(212, 175, 55, 0.15); }
    100% { box-shadow: 0 15px 40px rgba(212, 175, 55, 0.35), 0 0 20px rgba(212, 175, 55, 0.1); }
}

.champion-card .trophy-icon {
    font-size: 3.5rem;
    margin-bottom: 1rem;
    display: inline-block;
    animation: float 4s ease-in-out infinite;
}

@keyframes float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-8px); }
}

.champion-card h4 {
    font-size: 0.85rem;
    color: var(--color-accent);
    letter-spacing: 2px;
    text-transform: uppercase;
    font-weight: 700;
    margin-bottom: 0.5rem;
}

.champion-team-flag {
    width: 80px;
    height: 53px;
    border-radius: var(--border-radius-sm);
    box-shadow: 0 4px 10px rgba(0,0,0,0.4);
    margin: 0.5rem auto 1rem;
    object-fit: cover;
    display: block;
}

.champion-team-name {
    font-size: 1.25rem;
    font-weight: 800;
    color: var(--text-primary);
}

.champion-card.empty-champion {
    border-style: dashed;
    border-color: var(--border-color);
    background: var(--bg-secondary);
    box-shadow: none;
    animation: none;
}

.champion-card.empty-champion .trophy-icon {
    opacity: 0.35;
    animation: none;
}

.champion-card.empty-champion .champion-team-name {
    color: var(--text-secondary);
    font-weight: 500;
    font-size: 1rem;
}

/* Celebration Overlay (Modal) */
.overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.85);
    backdrop-filter: blur(10px);
    z-index: 10000;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.5s ease;
}

.overlay.show {
    opacity: 1;
    pointer-events: auto;
}

.celebration-card {
    background: linear-gradient(135deg, rgba(16, 23, 42, 0.95) 0%, rgba(10, 15, 29, 0.95) 100%);
    border: 2px solid var(--color-accent);
    border-radius: var(--border-radius-lg);
    box-shadow: 0 25px 60px -15px rgba(212, 175, 55, 0.3);
    width: 90%;
    max-width: 450px;
    padding: 3rem 2rem;
    text-align: center;
    position: relative;
    transform: scale(0.8);
    transition: transform 0.5s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

.overlay.show .celebration-card {
    transform: scale(1);
}

.close-overlay {
    position: absolute;
    top: 1rem;
    right: 1.5rem;
    background: none;
    border: none;
    color: var(--text-secondary);
    font-size: 2rem;
    cursor: pointer;
    transition: var(--transition-smooth);
}

.close-overlay:hover {
    color: var(--text-primary);
}

.trophy-wrapper {
    font-size: 5rem;
    margin-bottom: 1.5rem;
    filter: drop-shadow(0 0 15px var(--color-accent));
    animation: rotateScale 1s ease-out;
}

@keyframes rotateScale {
    0% { transform: scale(0) rotate(-45deg); }
    70% { transform: scale(1.2) rotate(10deg); }
    100% { transform: scale(1) rotate(0); }
}

.congrats-title {
    font-weight: 900;
    font-size: 1.75rem;
    letter-spacing: 1px;
    color: var(--color-accent);
    margin-bottom: 1rem;
}

.champion-display {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.75rem;
    margin: 1.5rem 0;
    padding: 1rem;
    background: rgba(255, 255, 255, 0.03);
    border-radius: var(--border-radius-md);
    border: 1px solid rgba(255, 255, 255, 0.05);
}

.celebration-text {
    font-size: 0.95rem;
    color: var(--text-secondary);
    margin-bottom: 2rem;
}

/* Responsiveness */
@media (max-width: 1200px) {
    /* For medium devices, brackets scroll is normal */
}

@media (max-width: 768px) {
    .header-content {
        flex-direction: column;
        text-align: center;
        padding-top: 1rem;
    }
    .logo-area {
        flex-direction: column;
        gap: 0.5rem;
    }
    .controls-area {
        width: 100%;
        justify-content: center;
    }
    
    .nav-tabs {
        justify-content: center;
    }
    
    .tab-link {
        font-size: 0.9rem;
        padding: 0.6rem 1rem;
    }
    
    .groups-grid {
        grid-template-columns: 1fr;
    }

    .match-team {
        font-size: 0.8rem;
    }
    
    /* On mobile, show country abbreviation and hide full name if space is tight */
    .team-name-full {
        display: none;
    }
    .team-abbr {
        display: inline;
    }
}