@import url('https://fonts.googleapis.com/css2?family=Outfit:wght@300;400;500;600;700&display=swap');
@import url('https://fonts.googleapis.com/css2?family=Fira+Code:wght@400;500&display=swap');

:root {
    --bg-dark: #09090b;
    --bg-panel: rgba(24, 24, 27, 0.7);
    --bg-header: rgba(9, 9, 11, 0.85);
    
    --text-primary: #fafafa;
    --text-secondary: #a1a1aa;
    --text-muted: #52525b;
    
    --accent: #8b5cf6;
    --accent-hover: #a78bfa;
    --accent-glow: rgba(139, 92, 246, 0.5);
    
    --border: rgba(63, 63, 70, 0.4);
    
    --difficulty-easy: #4ade80;
    --difficulty-medium: #facc15;
    --difficulty-hard: #f87171;
    
    --streak-color: #f97316;
    --points-color: #eab308;
    
    --success: #4ade80;
    --error: #f87171;
    --warning: #facc15;
    --info: #38bdf8;
}

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

body {
    font-family: 'Outfit', sans-serif;
    background-color: var(--bg-dark);
    background-image: 
        radial-gradient(circle at 15% 50%, rgba(139, 92, 246, 0.1), transparent 25%),
        radial-gradient(circle at 85% 30%, rgba(56, 189, 248, 0.1), transparent 25%);
    color: var(--text-primary);
    height: 100vh;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.navbar {
    height: 70px;
    background-color: var(--bg-header);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 32px;
    z-index: 10;
}

.logo {
    font-weight: 700;
    font-size: 1.5rem;
    background: linear-gradient(135deg, #a78bfa, #38bdf8);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    letter-spacing: -0.5px;
}

.nav-links {
    list-style: none;
    display: flex;
    gap: 12px;
}

.nav-links a {
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    padding: 10px 16px;
    border-radius: 8px;
    transition: all 0.3s ease;
}

.nav-links a:hover, .nav-links a.active {
    color: var(--text-primary);
    background-color: rgba(255, 255, 255, 0.05);
}

.user-profile {
    display: flex;
    align-items: center;
    gap: 16px;
}

/* Connection Status Indicator */
.connection-indicator {
    display: flex;
    align-items: center;
    gap: 6px;
    position: relative;
}

.connection-dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    transition: background-color 0.3s, box-shadow 0.3s;
}

.connection-dot.connected {
    background-color: var(--success);
    box-shadow: 0 0 8px rgba(74, 222, 128, 0.6);
    animation: pulse-green 2s infinite;
}

.connection-dot.disconnected {
    background-color: var(--error);
    box-shadow: 0 0 8px rgba(248, 113, 113, 0.4);
}

.connection-dot.reconnecting {
    background-color: var(--warning);
    box-shadow: 0 0 8px rgba(250, 204, 21, 0.4);
    animation: pulse-yellow 1s infinite;
}

.connection-dot.error,
.connection-dot.failed {
    background-color: var(--error);
    box-shadow: 0 0 8px rgba(248, 113, 113, 0.6);
}

@keyframes pulse-green {
    0%, 100% { box-shadow: 0 0 4px rgba(74, 222, 128, 0.3); }
    50% { box-shadow: 0 0 12px rgba(74, 222, 128, 0.7); }
}

@keyframes pulse-yellow {
    0%, 100% { opacity: 0.5; }
    50% { opacity: 1; }
}

.connection-tooltip {
    font-size: 0.75rem;
    color: var(--text-muted);
    display: none;
}

.connection-indicator:hover .connection-tooltip {
    display: inline;
}

/* Points Indicator */
.points-indicator {
    display: flex;
    align-items: center;
    gap: 6px;
    color: var(--points-color);
    font-weight: 600;
    background: rgba(234, 179, 8, 0.1);
    padding: 6px 12px;
    border-radius: 20px;
    border: 1px solid rgba(234, 179, 8, 0.2);
    box-shadow: 0 0 10px rgba(234, 179, 8, 0.1);
    transition: transform 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

.points-indicator.bump {
    transform: scale(1.15);
    box-shadow: 0 0 20px rgba(234, 179, 8, 0.4);
}

.points-icon {
    font-size: 1rem;
}

/* Streak Indicator */
.streak-indicator {
    display: flex;
    align-items: center;
    gap: 6px;
    color: var(--streak-color);
    font-weight: 600;
    background: rgba(249, 115, 22, 0.1);
    padding: 6px 12px;
    border-radius: 20px;
    border: 1px solid rgba(249, 115, 22, 0.2);
    box-shadow: 0 0 10px rgba(249, 115, 22, 0.1);
    transition: transform 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

.streak-indicator.bump {
    transform: scale(1.15);
    box-shadow: 0 0 20px rgba(249, 115, 22, 0.4);
}

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

.user-profile .avatar {
    width: 40px;
    height: 40px;
    background: linear-gradient(135deg, var(--accent), #38bdf8);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    font-size: 1.1rem;
    box-shadow: 0 4px 12px rgba(139, 92, 246, 0.3);
}

#main-content {
    flex: 1;
    overflow: auto;
}

.view {
    display: none;
    height: 100%;
    animation: fadeIn 0.4s ease forwards;
}

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

.view.active-view {
    display: block;
}

.container {
    max-width: 1000px;
    margin: 40px auto;
    padding: 0 20px;
}

h1 {
    font-size: 2.5rem;
    margin-bottom: 30px;
    font-weight: 700;
    letter-spacing: -1px;
}

h2 {
    margin-bottom: 20px;
    font-weight: 600;
}

.problem-list {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.problem-card {
    background-color: var(--bg-panel);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 20px 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    cursor: pointer;
    transition: all 0.3s ease;
}

.problem-card:hover {
    transform: translateY(-4px);
    border-color: var(--accent);
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.5), 0 0 15px var(--accent-glow);
}

.problem-card-left {
    display: flex;
    align-items: center;
    gap: 20px;
}

.status {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: bold;
    font-size: 1rem;
}
.status.solved { 
    background: rgba(74, 222, 128, 0.1);
    color: var(--difficulty-easy); 
    border: 1px solid rgba(74, 222, 128, 0.2);
}
.status.unsolved { 
    background: rgba(161, 161, 170, 0.1);
    color: var(--text-secondary); 
    border: 1px solid rgba(161, 161, 170, 0.2);
}

.details h3 {
    margin: 0 0 6px 0;
    font-size: 1.2rem;
    font-weight: 600;
}

.difficulty {
    font-size: 0.85rem;
    font-weight: 600;
    padding: 4px 10px;
    border-radius: 12px;
    display: inline-block;
}
.difficulty.easy { background: rgba(74, 222, 128, 0.1); color: var(--difficulty-easy); }
.difficulty.medium { background: rgba(250, 204, 21, 0.1); color: var(--difficulty-medium); }
.difficulty.hard { background: rgba(248, 113, 113, 0.1); color: var(--difficulty-hard); }

.solve-btn {
    background: rgba(255,255,255,0.05);
    border: 1px solid var(--border);
    color: var(--text-primary);
    padding: 8px 16px;
    border-radius: 8px;
    font-family: inherit;
    font-weight: 500;
    transition: all 0.2s;
    cursor: pointer;
}
.problem-card:hover .solve-btn {
    background: var(--accent);
    border-color: var(--accent);
    color: white;
}

/* Loading / Empty states */
.loading-state,
.empty-state {
    text-align: center;
    color: var(--text-muted);
    padding: 2rem;
    font-size: 0.95rem;
}

.split-screen {
    display: flex;
    height: 100%;
}

.panel {
    flex: 1;
    display: flex;
    flex-direction: column;
    border-right: 1px solid var(--border);
}

.panel.left-panel {
    background-color: transparent;
    padding: 0;
    overflow-y: auto;
}

.panel.right-panel {
    background-color: var(--bg-panel);
    backdrop-filter: blur(10px);
}

.panel-header {
    padding: 16px 24px;
    background-color: rgba(255,255,255,0.02);
    border-bottom: 1px solid var(--border);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.panel-header h2 {
    margin: 0;
    font-size: 1.2rem;
}

.panel-content {
    padding: 24px;
    line-height: 1.7;
    color: var(--text-secondary);
    overflow-y: auto;
    flex: 1;
}

.panel-content p {
    margin-bottom: 16px;
}

.panel-content code {
    background: rgba(255,255,255,0.05);
    padding: 2px 6px;
    border-radius: 4px;
    color: var(--accent-hover);
    font-family: 'Fira Code', monospace;
    font-size: 0.9em;
}

.panel-content pre {
    background-color: rgba(0,0,0,0.3);
    padding: 16px;
    border-radius: 8px;
    margin-top: 12px;
    border: 1px solid var(--border);
    overflow-x: auto;
}

.panel-content pre code {
    background: none;
    padding: 0;
    color: var(--text-primary);
}

.editor-section {
    flex: 2;
    display: flex;
    flex-direction: column;
    border-bottom: 1px solid var(--border);
}

.editor-container {
    flex: 1;
    display: flex;
    overflow: hidden;
    background-color: rgba(0,0,0,0.1);
}

.line-numbers {
    width: 40px;
    padding: 20px 0;
    text-align: right;
    padding-right: 10px;
    font-family: 'Fira Code', monospace;
    font-size: 0.95rem;
    line-height: 1.5;
    color: var(--text-secondary);
    background-color: rgba(0,0,0,0.2);
    border-right: 1px solid var(--border);
    user-select: none;
    overflow: hidden;
}

.code-editor {
    flex: 1;
    background-color: transparent;
    color: var(--text-primary);
    border: none;
    padding: 20px 24px;
    font-family: 'Fira Code', monospace;
    font-size: 0.95rem;
    line-height: 1.5;
    resize: none;
    outline: none;
    white-space: pre;
    overflow-wrap: normal;
    overflow-x: auto;
    tab-size: 4;
}

.code-editor::placeholder {
    color: var(--text-muted);
}

.terminal-section {
    flex: 1;
    display: flex;
    flex-direction: column;
}

.terminal-output {
    flex: 1;
    padding: 16px 24px;
    font-family: 'Fira Code', monospace;
    font-size: 0.9rem;
    color: #a1a1aa;
    background-color: #000;
    overflow-y: auto;
}

.terminal-line {
    margin-bottom: 2px;
    white-space: pre-wrap;
    word-break: break-all;
}

.terminal-success {
    color: var(--success);
}

.terminal-error {
    color: var(--error);
}

.terminal-info {
    color: var(--info);
}

.terminal-warning {
    color: var(--warning);
}

.run-btn {
    background: linear-gradient(135deg, var(--accent), #6d28d9);
    color: white;
    border: none;
    padding: 8px 20px;
    border-radius: 6px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s;
    box-shadow: 0 4px 12px var(--accent-glow);
    font-family: inherit;
}

.run-btn:hover {
    transform: translateY(-1px);
    box-shadow: 0 6px 16px var(--accent-glow);
}

.run-btn:active {
    transform: translateY(1px);
}

.clear-btn {
    background: rgba(255,255,255,0.05);
    border: 1px solid var(--border);
    color: var(--text-secondary);
    padding: 6px 14px;
    border-radius: 6px;
    font-family: inherit;
    font-size: 0.85rem;
    cursor: pointer;
    transition: all 0.2s;
}

.clear-btn:hover {
    color: var(--text-primary);
    border-color: var(--accent);
}

.leaderboard-list {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.leaderboard-header-row,
.leaderboard-row {
    display: grid;
    grid-template-columns: 80px 1fr 120px 100px 100px;
    align-items: center;
    padding: 14px 20px;
    border-radius: 10px;
    gap: 12px;
}

.leaderboard-header-row {
    color: var(--text-muted);
    font-size: 0.85rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    border-bottom: 1px solid var(--border);
    padding-bottom: 12px;
    margin-bottom: 4px;
}

.leaderboard-row {
    background-color: var(--bg-panel);
    backdrop-filter: blur(10px);
    border: 1px solid var(--border);
    transition: all 0.2s ease;
}

.leaderboard-row:hover {
    border-color: var(--accent);
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.3), 0 0 10px var(--accent-glow);
    transform: translateX(4px);
}

.lb-rank {
    font-size: 1.2rem;
    font-weight: 700;
    text-align: center;
}

.lb-name {
    font-weight: 600;
    color: var(--text-primary);
}

.lb-points {
    color: var(--points-color);
    font-weight: 600;
}

.lb-streak {
    color: var(--streak-color);
    font-weight: 500;
}

.lb-solved {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.discussion-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 24px;
}

.new-post-btn {
    background: var(--accent);
    color: white;
    border: none;
    padding: 10px 20px;
    border-radius: 8px;
    font-weight: 600;
    cursor: pointer;
    font-family: inherit;
    transition: all 0.2s;
}

.new-post-btn:hover {
    background: var(--accent-hover);
    transform: translateY(-1px);
}

.post-list {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.post-card {
    background: var(--bg-panel);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 20px;
    transition: all 0.2s;
}

.post-card:hover {
    border-color: var(--accent);
}

.post-author {
    color: var(--accent-hover);
    font-weight: 600;
    margin-bottom: 8px;
}

.post-content h4 {
    margin-bottom: 8px;
}

.post-content p {
    color: var(--text-secondary);
    line-height: 1.6;
}

.post-meta {
    margin-top: 12px;
    font-size: 0.85rem;
    color: var(--text-muted);
}

.streak-modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0,0,0,0.7);
    backdrop-filter: blur(5px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 100;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s;
}

.streak-modal.show {
    opacity: 1;
    pointer-events: all;
}

.streak-modal-content {
    background: var(--bg-panel);
    border: 1px solid var(--border);
    padding: 40px;
    border-radius: 16px;
    text-align: center;
    transform: scale(0.9);
    transition: transform 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    box-shadow: 0 20px 40px rgba(0,0,0,0.5), 0 0 40px rgba(249, 115, 22, 0.2);
    max-width: 420px;
    width: 90%;
}

.streak-modal.show .streak-modal-content {
    transform: scale(1);
}

.streak-modal-icon {
    font-size: 4rem;
    margin-bottom: 20px;
    animation: float 2s ease-in-out infinite;
}

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

.streak-modal-content h2 {
    color: var(--streak-color);
    font-size: 2rem;
    margin-bottom: 10px;
}

.streak-modal-content p {
    color: var(--text-secondary);
    margin-bottom: 12px;
}

.streak-modal-bonus {
    color: var(--points-color);
    font-weight: 600;
    font-size: 1.1rem;
}

.streak-modal-btn {
    background: var(--streak-color);
    color: white;
    border: none;
    padding: 10px 24px;
    border-radius: 8px;
    font-weight: 600;
    font-size: 1rem;
    cursor: pointer;
    font-family: inherit;
    margin-top: 8px;
    transition: all 0.2s;
}

.streak-modal-btn:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 16px rgba(249, 115, 22, 0.4);
}

@media (max-width: 768px) {
    .navbar {
        padding: 0 16px;
        height: 60px;
    }

    .nav-links {
        gap: 4px;
    }

    .nav-links a {
        padding: 8px 10px;
        font-size: 0.85rem;
    }

    .user-profile {
        gap: 8px;
    }

    .points-indicator,
    .streak-indicator {
        padding: 4px 8px;
        font-size: 0.85rem;
    }

    .split-screen {
        flex-direction: column;
    }

    .panel {
        border-right: none;
        border-bottom: 1px solid var(--border);
    }

    .container {
        margin: 20px auto;
        padding: 0 16px;
    }

    h1 {
        font-size: 1.8rem;
        margin-bottom: 20px;
    }

    .leaderboard-header-row,
    .leaderboard-row {
        grid-template-columns: 50px 1fr 80px;
    }

    .lb-streak,
    .lb-solved {
        display: none;
    }

    .problem-card {
        padding: 16px;
    }
}

@media (max-width: 480px) {
    .nav-links {
        display: none; /* Use hamburger menu in production */
    }

    .connection-indicator {
        display: none;
    }
}