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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background: linear-gradient(135deg, #1a2a1a 0%, #0d1a0d 100%);
    color: #fff;
    min-height: 100vh;
}

.header {
    background-color: #ffffff;
    padding: 15px 0;
    border-bottom: 1px solid #e5e7eb;
    width: 100%;
}

.header .container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
}

.logo-img {
    height: 40px;
}

.nav {
    display: flex;
    gap: 25px;
}

.nav a {
    color: #4b5563;
    text-decoration: none;
    font-weight: 400;
    font-size: 16px;
    transition: color 0.3s ease;
}

.nav a:hover {
    color: #059669;
}

.auth-buttons {
    display: flex;
    gap: 12px;
    align-items: center;
}

.user-greeting {
    color: #4b5563;
    font-size: 14px;
    font-weight: 500;
    margin-right: 5px;
}

.btn {
    padding: 8px 18px;
    border-radius: 20px;
    text-decoration: none;
    font-weight: 600;
    font-size: 14px;
    transition: all 0.3s ease;
    border: 1px solid transparent;
    display: inline-block;
    text-align: center;
    cursor: pointer;
}

.btn-primary {
    background-color: #059669;
    color: white;
    border-color: #059669;
}

.btn-primary:hover {
    background-color: #047857;
    border-color: #047857;
    transform: translateY(-1px);
    box-shadow: 0 2px 8px rgba(5, 150, 105, 0.3);
}

.btn-secondary {
    background-color: #0f172a;
    color: #ffffff;
    border: none;
}

.btn-secondary:hover {
    background-color: #1e293b;
    transform: translateY(-1px);
    box-shadow: 0 2px 8px rgba(15, 23, 42, 0.2);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

.profile-container {
    max-width: 1200px;
    margin: 30px auto;
    padding: 0 20px;
}

.profile-header {
    background: linear-gradient(135deg, #2d4a2d 0%, #1a3a1a 100%);
    border-radius: 15px;
    padding: 40px;
    display: flex;
    gap: 30px;
    align-items: flex-start;
    margin-bottom: 30px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
    position: relative;
}

.profile-avatar {
    width: 150px;
    height: 150px;
    border-radius: 50%;
    background: linear-gradient(135deg, #FFD54F, #FFA726);
    flex-shrink: 0;
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 70px;
    border: 4px solid #4CAF50;
}

.profile-avatar img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.profile-info {
    flex: 1;
}

.profile-name {
    font-size: 36px;
    font-weight: bold;
    margin-bottom: 15px;
}

.profile-bio {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 8px;
    color: #b8d4b8;
    font-size: 16px;
}

.profile-status {
    color: #90CAF9;
    font-size: 15px;
}

.profile-actions {
    display: flex;
    gap: 15px;
    margin-top: 20px;
    align-items: center;
}

.btn-follow {
    background: #4CAF50;
    color: white;
    padding: 10px 25px;
    border-radius: 8px;
    border: none;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s;
    text-decoration: none;
    display: inline-block;
}

.btn-follow:hover {
    background: #45a049;
    transform: translateY(-2px);
}

.btn-message {
    background: transparent;
    border: 2px solid #4CAF50;
    color: #4CAF50;
    padding: 10px 25px;
    border-radius: 8px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s;
    text-decoration: none;
    display: inline-block;
}

.btn-message:hover {
    background: rgba(76, 175, 80, 0.1);
}

.icon-button {
    background: transparent;
    border: none;
    color: #fff;
    cursor: pointer;
    padding: 8px;
    border-radius: 50%;
    transition: background 0.3s;
    font-size: 20px;
}

.icon-button:hover {
    background: rgba(255, 255, 255, 0.1);
}

.profile-stats {
    position: absolute;
    top: 40px;
    right: 40px;
    text-align: right;
}

.co2-stat {
    font-size: 28px;
    font-weight: bold;
    color: #4CAF50;
}

.co2-label {
    color: #b8d4b8;
    font-size: 14px;
    margin-bottom: 15px;
}

.challenges-stat {
    margin-top: 15px;
    font-size: 20px;
    font-weight: bold;
    margin-bottom: 15px;
}

.content-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 25px;
}

.card {
    background: #1e2e1e;
    border-radius: 12px;
    padding: 25px;
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.2);
}

.card-title {
    font-size: 22px;
    font-weight: bold;
    margin-bottom: 20px;
    color: #fff;
}

.challenge-item {
    background: #2a3d2a;
    padding: 18px;
    border-radius: 10px;
    margin-bottom: 15px;
    display: flex;
    align-items: center;
    gap: 15px;
}

.challenge-icon {
    width: 50px;
    height: 50px;
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    flex-shrink: 0;
}

.challenge-info {
    flex: 1;
}

.challenge-name {
    font-weight: 600;
    margin-bottom: 5px;
}

.progress-bar {
    width: 100%;
    height: 8px;
    background: #1a2a1a;
    border-radius: 10px;
    overflow: hidden;
    margin-top: 8px;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, #4CAF50, #8BC34A);
    transition: width 0.3s;
}

.progress-text {
    color: #90CAF9;
    font-size: 13px;
    margin-top: 5px;
}

.activity-item {
    background: #2a3d2a;
    padding: 18px;
    border-radius: 10px;
    margin-bottom: 15px;
}

.activity-header {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 12px;
}

.activity-avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: #FFD54F;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
}

.activity-meta {
    flex: 1;
}

.activity-type {
    font-size: 13px;
    color: #90CAF9;
}

.activity-date {
    font-size: 12px;
    color: #777;
}

.activity-content {
    color: #e0e0e0;
    line-height: 1.5;
    margin-bottom: 10px;
}

.activity-stats {
    display: flex;
    gap: 15px;
    font-size: 13px;
    color: #888;
}

.activity-stat {
    display: flex;
    align-items: center;
    gap: 5px;
}

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

.impact-value {
    font-size: 48px;
    font-weight: bold;
    color: #4CAF50;
    margin: 20px 0;
}

.impact-label {
    color: #b8d4b8;
    font-size: 16px;
    margin-bottom: 10px;
}

.impact-comparison {
    color: #90CAF9;
    font-size: 14px;
}

.view-all {
    color: #4CAF50;
    cursor: pointer;
    font-size: 14px;
    margin-top: 15px;
    display: inline-block;
}

.view-all:hover {
    text-decoration: underline;
}

@media (max-width: 768px) {
    .content-grid {
        grid-template-columns: 1fr;
    }

    .profile-header {
        flex-direction: column;
        text-align: center;
    }

    .profile-stats {
        position: static;
        text-align: center;
        margin-top: 20px;
    }

    .profile-actions {
        justify-content: center;
    }
}

.logout {
    background: #D8000C;
    color: white;
    padding: 10px 25px;
    border-radius: 8px;
    border: none;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s;
    text-decoration: none;
    display: inline-block;
}

.logout:hover {
    background-color: #b3000a;
}