/* --- Modern sidebar navigation --- */
body {
    background: #f5f6f8;
    margin: 0;
    font-family: 'Segoe UI', 'Arial', sans-serif;
    color: #222;
}
.logo-container {
    display: flex;
    align-items: center;
    background: #fff;
    padding: 32px 0 16px 0;
    margin: 0;
    justify-content: center;
}
.logo {
    height: 100px;
    margin-left: 0;
}
.tabs {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    background: #e3e5e8;
    padding: 32px 0 32px 48px;
    min-width: 340px;
    min-height: 600px;
    border-radius: 0 32px 32px 0;
    box-shadow: 4px 0 32px 0 rgba(180,180,180,0.10);
    position: absolute;
    top: 0;
    left: 0;
    height: 100vh;
    z-index: 10;
}
.tab-button {
    display: flex;
    align-items: center;
    width: 260px;
    padding: 22px 32px;
    margin: 0 0 24px 0;
    font-size: 1.7rem;
    font-weight: 700;
    color: #222;
    background: linear-gradient(180deg, #f7f8fa 0%, #d3d5d8 100%);
    border: none;
    border-radius: 22px;
    box-shadow: 0 4px 18px 0 rgba(120,120,120,0.13), 0 1.5px 4px 0 rgba(0,0,0,0.10);
    cursor: pointer;
    transition: background 0.15s, box-shadow 0.15s, color 0.15s, transform 0.08s;
    text-align: left;
    letter-spacing: 0.5px;
    outline: none;
    text-decoration: none !important;
    gap: 18px;
}
.tab-button:active, .tab-button:focus, .tab-button:hover {
    background: linear-gradient(180deg, #e3e5e8 0%, #bfc2c7 100%);
    color: #1976d2;
    box-shadow: 0 8px 32px 0 rgba(100, 149, 237, 0.18);
    transform: scale(1.04);
    text-decoration: none !important;
}
.tab-button:visited {
    color: #222;
    text-decoration: none !important;
}

/* --- Main content area --- */
.tab-content {
    margin-left: 400px;
    margin-top: 40px;
    background: #f7f8fa;
    border-radius: 18px;
    box-shadow: 0 8px 32px 0 rgba(180,180,180,0.10);
    padding: 48px 64px 64px 64px;
    min-width: 700px;
    max-width: 900px;
    min-height: 400px;
}
.center-form {
    align-items: flex-start;
}
.center-form form {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: 32px;
    width: 100%;
}
.center-form input[type="text"] {
    font-size: 2.5rem;
    padding: 24px 32px;
    border-radius: 10px;
    border: 1.5px solid #bfc2c7;
    margin-bottom: 0;
    width: 100%;
    max-width: 700px;
    box-sizing: border-box;
    text-align: left;
    background: #f5f6f8;
    color: #232a31;
    font-weight: 500;
    box-shadow: 0 2px 8px 0 rgba(80, 80, 80, 0.06);
}
.center-form label {
    font-size: 2rem;
    font-weight: 600;
    margin-bottom: 8px;
    color: #232a31;
}

/* --- Large action button with icon --- */
.action-button {
    font-size: 2.2rem;
    font-weight: bold;
    padding: 28px 60px 28px 60px;
    border-radius: 14px;
    background: linear-gradient(90deg, #bfc2c7 0%, #e3e5e8 100%);
    color: #232a31;
    border: none;
    box-shadow: 0 8px 32px 0 rgba(180,180,180,0.18), 0 2px 8px 0 rgba(180,180,180,0.12);
    cursor: pointer;
    margin-top: 18px;
    margin-bottom: 10px;
    letter-spacing: 1px;
    transition: background 0.2s, transform 0.1s, box-shadow 0.1s;
    outline: none;
    display: flex;
    align-items: center;
    gap: 18px;
    justify-content: center;
}
.action-button:before {
    content: "\1F4C4";
    font-size: 2.2rem;
    margin-right: 12px;
    display: inline-block;
    color: #1976d2;
}
.action-button:hover, .action-button:focus {
    background: linear-gradient(90deg, #d3d5d8 0%, #bfc2c7 100%);
    color: #1976d2;
    box-shadow: 0 12px 36px 0 rgba(100, 149, 237, 0.22), 0 4px 12px 0 rgba(180,180,180,0.16);
}

/* --- Responsive --- */
@media (max-width: 1200px) {
    .tab-content {
        margin-left: 0;
        min-width: 0;
        max-width: 100vw;
        padding: 32px 8vw 32px 8vw;
    }
    .tabs {
        min-width: 0;
        padding: 24px 0 24px 0;
        border-radius: 0;
        position: static;
        height: auto;
        flex-direction: row;
        justify-content: center;
        align-items: center;
        box-shadow: none;
    }
    .tab-button {
        width: auto;
        min-width: 180px;
        margin: 0 12px 0 0;
        font-size: 1.1rem;
        padding: 16px 18px;
    }
}