body {
    font-family: 'Inter', 'Segoe UI', Arial, sans-serif;
    background: #e2e2e2;
    color: #2a2a2a;
    margin: 0;
}

#header {
    background: #d2d2d2;
    color: #1a1a1a;
    padding: 24px 20px;
    letter-spacing: 2px;
    border-bottom: 2px solid #c0c0c0;
    text-align: center;
}

#menu-bar {
    background: #dbdbdb;
    padding: 10px 0;
    text-align: center;
    border-bottom: 1px solid #c9c9c9;
}

#menu-bar ul {
    list-style: none;
    margin: 0;
    padding: 0;
}

#menu-bar li {
    display: inline;
    margin: 0 18px;
}

#menu-bar a {
    color: #3a3a3a;
    text-decoration: none;
    font-size: 90%;
    font-weight: 600;
}

#menu-bar a:hover {
    color: #121212;
}

.container {
    display: flex;
    flex-direction: row-reverse;
    gap: 30px;
    padding: 30px;
    max-width: 1400px;
    margin: 0 auto;
}

.sidebar {
    width: 280px;
    background: #f2f2f2;
    padding: 22px;
    border-radius: 16px;
    box-shadow: 0 12px 30px rgba(0, 0, 0, 0.08);
    border: 1px solid #d0d0d0;
    height: fit-content;
}

.sidebar-btn {
    width: 100%;
    padding: 14px;
    background: #ebebeb;
    border: 1px solid #c8c8c8;
    border-radius: 10px;
    font-weight: 600;
    color: #2a2a2a;
    cursor: pointer;
    margin-bottom: 12px;
    transition: all 0.2s ease;
    text-align: left;
}

.sidebar-btn:hover {
    background: #d8d8d8;
    color: #121212;
    transform: translateY(-2px);
}

#content-area {
    flex: 1;
}

#content-1, #content-2 {
    background: #f8f8f8;
    padding: 40px;
    border-radius: 18px;
    margin-bottom: 20px;
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.08);
    border: 1px solid #dbdbdb;
    font-family: 'Segoe UI', Arial, sans-serif;
    font-style: italic;
    letter-spacing: 0.5px;
}

h1,
h3 {
    color: #1f1f1f;
    margin-top: 0;
    font-weight: 700;
}

h2 {
    font-weight: 600;
    color: #2f2f2f;
}

p, li {
    font-weight: 400;
    color: #3c3c3c;
}

.activities button {
    background: #ededed;
    border: 1px solid #d1d1d1;
    padding: 10px 16px;
    margin: 6px 0;
    border-radius: 8px;
    width: 100%;
    text-align: left;
    cursor: pointer;
    transition: 0.2s;
    font-size: 14px;
    font-weight: 500;
    color: #2a2a2a;
}

.activities button:hover {
    border-color: #b7b7b7;
    color: #111111;
    background: #dcdcdc;
}

.activity-modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.18);
    display: none;
    z-index: 1001;
    justify-content: center;
    align-items: center;
}

.activity-modal.show {
    display: flex;
}

.modal-content {
    background: #ededed;
    padding: 36px;
    border-radius: 20px;
    box-shadow: 0 30px 45px rgba(0, 0, 0, 0.08);
    border: 1px solid #d1d1d1;
    max-width: 600px;
    max-height: 80vh;
    overflow-y: auto;
    position: relative;
    text-align: center;
}

.close-modal {
    position: absolute;
    top: 15px;
    right: 20px;
    font-size: 36px;
    font-weight: 400;
    color: #2d2d2d;
    cursor: pointer;
    transition: 0.2s;
}

.close-modal:hover {
    color: #121212;
}

#activity-display {
    color: #2d2d2d;
    font-size: 16px;
    line-height: 1.6;
}

#user-input {
    width: 100% !important;
    max-width: 100% !important;
    padding: 12px !important;
    border: 2px solid #bdbdbd !important;
    border-radius: 8px !important;
    font-size: 16px !important;
    margin: 20px 0 !important;
    box-sizing: border-box !important;
    font-family: 'Inter', 'Segoe UI', Arial, sans-serif !important;
    background: #f6f6f6 !important;
    color: #262626 !important;
    transition: border-color 0.2s !important;
}

#user-input:focus {
    outline: none !important;
    border-color: #8a8a8a !important;
    box-shadow: 0 0 0 3px rgba(0, 0, 0, 0.06) !important;
}

#submit-btn, #cancel-btn {
    padding: 12px 30px !important;
    border: none !important;
    border-radius: 8px !important;
    cursor: pointer !important;
    font-size: 16px !important;
    font-weight: 500 !important;
    transition: all 0.2s !important;
}

#submit-btn {
    background: #2d2d2d !important;
    color: #ffffff !important;
}

#submit-btn:hover {
    background: #1a1a1a !important;
    transform: translateY(-2px) !important;
}

#cancel-btn {
    background: #bbbbbb !important;
    color: #1b1b1b !important;
}

#cancel-btn:hover {
    background: #999999 !important;
    transform: translateY(-2px) !important;
}

#footer {
    background: #cccccc;
    color: #262626;
    text-align: center;
    padding: 18px 0;
    border-top: 1px solid #c9c9c9;
    font-size: 14px;
}